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2 r 1 
/*
1160 maechler 2 
 *  R : A Computer Language for Statistical Data Analysis
2 r 3 
 *  Copyright (C) 1995, 1996, 1997 Robert Gentleman and Ross Ihaka
40705 ripley 4 
 *  Copyright (C) 1998-2007	The R Development Core Team
2 r 5 
 *
6 
 *  This source code module:
2028 ihaka 7 
 *  Copyright (C) 1997, 1998 Paul Murrell and Ross Ihaka
37317 ripley 8 
 *  Copyright (C) 1998-2006	The R Development Core Team
2 r 9 
 *
10 
 *  This program is free software; you can redistribute it and/or modify
11 
 *  it under the terms of the GNU General Public License as published by
12 
 *  the Free Software Foundation; either version 2 of the License, or
13 
 *  (at your option) any later version.
14 
 *
15 
 *  This program is distributed in the hope that it will be useful,
16 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 
 *  GNU General Public License for more details.
19 
 *
20 
 *  You should have received a copy of the GNU General Public License
42307 ripley 21 
 *  along with this program; if not, a copy is available at
22 
 *  http://www.r-project.org/Licenses/
2 r 23 
 */
24 
 
32392 ripley 25 
/* <UTF8-FIXME>
32397 ripley 26 
   byte-level access and use of ctype functions for symbol font
27 
 
28 
   Has encoding of symbol font hard-coded.  Not clear if this is enough.
32380 ripley 29 
*/
30 
 
5187 hornik 31 
#ifdef HAVE_CONFIG_H
7701 hornik 32 
#include <config.h>
5187 hornik 33 
#endif
36489 ripley 34 
#include <Defn.h>
5187 hornik 35 
 
5233 hornik 36 
#include <ctype.h>
32624 ripley 37 
#ifdef SUPPORT_MBCS
35776 ripley 38 
# include <R_ext/rlocale.h>
32397 ripley 39 
# include <wchar.h>
40 
# include <wctype.h>
41 
#endif
5233 hornik 42 
 
32397 ripley 43 
 
11499 ripley 44 
#include <Rmath.h>
45 
#include <Graphics.h>
1926 ihaka 46 
 
5233 hornik 47 
 
27236 murrell 48 
/*
49 
 *  TeX Math Styles
50 
 *
51 
 *  The TeXBook, Appendix G, Page 441.
52 
 *
53 
 */
2 r 54 
 
27236 murrell 55 
typedef enum {
56 
    STYLE_SS1 = 1,
57 
    STYLE_SS  = 2,
58 
    STYLE_S1  = 3,
59 
    STYLE_S   = 4,
60 
    STYLE_T1  = 5,
61 
    STYLE_T   = 6,
62 
    STYLE_D1  = 7,
63 
    STYLE_D   = 8
64 
} STYLE;
65 
 
66 
typedef struct {
67 
    unsigned int BoxColor;
68 
    double BaseCex;
69 
    double ReferenceX;
70 
    double ReferenceY;
71 
    double CurrentX;
72 
    double CurrentY;
73 
    double CurrentAngle;
74 
    double CosAngle;
75 
    double SinAngle;
76 
    STYLE CurrentStyle;
77 
} mathContext;
78 
 
19875 murrell 79 
static GEUnit MetricUnit = GE_INCHES;
581 paul 80 
 
2028 ihaka 81 
/* Font Definitions */
2 r 82 
 
2028 ihaka 83 
typedef enum {
3475 pd 84 
    PlainFont	   = 1,
85 
    BoldFont	   = 2,
86 
    ItalicFont	   = 3,
2028 ihaka 87 
    BoldItalicFont = 4,
6098 pd 88 
    SymbolFont	   = 5
2028 ihaka 89 
} FontType;
90 
 
2122 maechler 91 
/*
2028 ihaka 92 
 *  Italic Correction Factor
93 
 *
94 
 *  The correction for a character is computed as ItalicFactor
95 
 *  times the height (above the baseline) of the character's
96 
 *  bounding box.
97 
 *
98 
 */
99 
 
100 
static double ItalicFactor = 0.15;
101 
 
102 
/* Drawing basics */
103 
 
104 
 
105 
/* Convert CurrentX and CurrentY from */
106 
/* 0 angle to and CurrentAngle */
107 
 
27236 murrell 108 
static double ConvertedX(mathContext *mc, GEDevDesc *dd)
2 r 109 
{
27236 murrell 110 
    double rotatedX = mc->ReferenceX +
111 
	(mc->CurrentX - mc->ReferenceX) * mc->CosAngle -
112 
	(mc->CurrentY - mc->ReferenceY) * mc->SinAngle;
113 
    return toDeviceX(rotatedX, MetricUnit, dd);
2 r 114 
}
115 
 
27236 murrell 116 
static double ConvertedY(mathContext *mc, GEDevDesc *dd)
2028 ihaka 117 
{
27236 murrell 118 
    double rotatedY = mc->ReferenceY +
119 
	(mc->CurrentY - mc->ReferenceY) * mc->CosAngle +
120 
	(mc->CurrentX - mc->ReferenceX) * mc->SinAngle;
121 
    return toDeviceY(rotatedY, MetricUnit, dd);
2028 ihaka 122 
}
2 r 123 
 
27236 murrell 124 
static void PMoveAcross(double xamount, mathContext *mc)
2 r 125 
{
27236 murrell 126 
    mc->CurrentX += xamount;
2 r 127 
}
128 
 
27236 murrell 129 
static void PMoveUp(double yamount, mathContext *mc)
2028 ihaka 130 
{
27236 murrell 131 
    mc->CurrentY += yamount;
2028 ihaka 132 
}
2 r 133 
 
27236 murrell 134 
static void PMoveTo(double x, double y, mathContext *mc)
2 r 135 
{
27236 murrell 136 
    mc->CurrentX = x;
137 
    mc->CurrentY = y;
2 r 138 
}
139 
 
2028 ihaka 140 
/* Basic Font Properties */
141 
 
27236 murrell 142 
static double xHeight(R_GE_gcontext *gc, GEDevDesc *dd)
2 r 143 
{
2028 ihaka 144 
    double height, depth, width;
27236 murrell 145 
    GEMetricInfo('x', gc,
146 
		&height, &depth, &width, dd);
147 
    return fromDeviceHeight(height, MetricUnit, dd);
2028 ihaka 148 
}
2 r 149 
 
27236 murrell 150 
static double XHeight(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 151 
{
152 
    double height, depth, width;
27236 murrell 153 
    GEMetricInfo('X', gc,
154 
		&height, &depth, &width, dd);
155 
    return fromDeviceHeight(height, MetricUnit, dd);
2 r 156 
}
157 
 
27236 murrell 158 
static double AxisHeight(R_GE_gcontext *gc, GEDevDesc *dd)
2 r 159 
{
2028 ihaka 160 
    double height, depth, width;
27236 murrell 161 
    GEMetricInfo('+', gc,
162 
		&height, &depth, &width, dd);
163 
    return fromDeviceHeight(0.5 * height, MetricUnit, dd);
2 r 164 
}
165 
 
27236 murrell 166 
static double Quad(R_GE_gcontext *gc, GEDevDesc *dd)
2 r 167 
{
2028 ihaka 168 
    double height, depth, width;
27236 murrell 169 
    GEMetricInfo('M', gc,
170 
		&height, &depth, &width, dd);
171 
    return fromDeviceHeight(width, MetricUnit, dd);
2028 ihaka 172 
}
173 
 
2105 ihaka 174 
/* The height of digits */
27236 murrell 175 
static double FigHeight(R_GE_gcontext *gc, GEDevDesc *dd)
2105 ihaka 176 
{
177 
    double height, depth, width;
27236 murrell 178 
    GEMetricInfo('0', gc,
179 
		&height, &depth, &width, dd);
180 
    return fromDeviceHeight(height, MetricUnit, dd);
2105 ihaka 181 
}
182 
 
183 
/* Depth of lower case descenders */
27236 murrell 184 
static double DescDepth(R_GE_gcontext *gc, GEDevDesc *dd)
2105 ihaka 185 
{
186 
    double height, depth, width;
27236 murrell 187 
    GEMetricInfo('g', gc,
188 
		&height, &depth, &width, dd);
189 
    return fromDeviceHeight(depth, MetricUnit, dd);
2105 ihaka 190 
}
191 
 
192 
/* Thickness of rules */
193 
static double RuleThickness()
194 
{
195 
    return 0.015;
196 
}
197 
 
27236 murrell 198 
static double ThinSpace(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 199 
{
200 
    double height, depth, width;
201 
    static double OneSixth = 0.16666666666666666666;
27236 murrell 202 
    GEMetricInfo('M', gc,
203 
		&height, &depth, &width, dd);
204 
    return fromDeviceHeight(OneSixth * width, MetricUnit, dd);
2028 ihaka 205 
}
206 
 
27236 murrell 207 
static double MediumSpace(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 208 
{
209 
    double height, depth, width;
210 
    static double TwoNinths = 0.22222222222222222222;
27236 murrell 211 
    GEMetricInfo('M', gc,
212 
		&height, &depth, &width, dd);
213 
    return fromDeviceHeight(TwoNinths * width, MetricUnit, dd);
2028 ihaka 214 
}
215 
 
27236 murrell 216 
static double ThickSpace(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 217 
{
218 
    double height, depth, width;
219 
    static double FiveEighteenths = 0.27777777777777777777;
27236 murrell 220 
    GEMetricInfo('M', gc,
221 
		&height, &depth, &width, dd);
222 
    return fromDeviceHeight(FiveEighteenths * width, MetricUnit, dd);
2028 ihaka 223 
}
224 
 
27236 murrell 225 
static double MuSpace(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 226 
{
227 
    double height, depth, width;
228 
    static double OneEighteenth = 0.05555555555555555555;
27236 murrell 229 
    GEMetricInfo('M', gc,
230 
		&height, &depth, &width, dd);
231 
    return fromDeviceHeight(OneEighteenth * width, MetricUnit, dd);
2028 ihaka 232 
}
233 
 
234 
 
235 
/*
236 
 *  Mathematics Layout Parameters
237 
 *
2123 maechler 238 
 *  The TeXBook, Appendix G, Page 447.
2028 ihaka 239 
 *
2105 ihaka 240 
 *  These values are based on an inspection of TeX metafont files
241 
 *  together with some visual simplification.
2028 ihaka 242 
 *
2105 ihaka 243 
 *  Note : The values are ``optimised'' for PostScript.
244 
 *
2028 ihaka 245 
 */
246 
 
247 
typedef enum {
3475 pd 248 
    sigma2,  sigma5,  sigma6,  sigma8,	sigma9,	 sigma10, sigma11,
2105 ihaka 249 
    sigma12, sigma13, sigma14, sigma15, sigma16, sigma17, sigma18,
250 
    sigma19, sigma20, sigma21, sigma22, xi8, xi9, xi10, xi11, xi12, xi13
2028 ihaka 251 
}
252 
TEXPAR;
253 
 
3475 pd 254 
#define SUBS	       0.7
2028 ihaka 255 
 
27236 murrell 256 
static double TeX(TEXPAR which, R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 257 
{
258 
    switch(which) {
259 
    case sigma2:  /* space */
260 
    case sigma5:  /* x_height */
27236 murrell 261 
	return xHeight(gc, dd);
2028 ihaka 262 
 
263 
    case sigma6:  /* quad */
27236 murrell 264 
	return Quad(gc, dd);
2028 ihaka 265 
 
266 
    case sigma8:  /* num1 */
27236 murrell 267 
	return AxisHeight(gc, dd)
31989 ripley 268 
	    + 3.51 * RuleThickness()
27236 murrell 269 
	    + 0.15 * XHeight(gc, dd)		/* 54/36 * 0.1 */
270 
	    + SUBS * DescDepth(gc, dd);
2028 ihaka 271 
    case sigma9:  /* num2 */
27236 murrell 272 
	return AxisHeight(gc, dd)
31989 ripley 273 
	    + 1.51 * RuleThickness()
27236 murrell 274 
	    + 0.08333333 * XHeight(gc, dd);	/* 30/36 * 0.1 */
2028 ihaka 275 
    case sigma10: /* num3 */
27236 murrell 276 
	return AxisHeight(gc, dd)
31989 ripley 277 
	    + 1.51 * RuleThickness()
27236 murrell 278 
	    + 0.1333333 * XHeight(gc, dd);	/* 48/36 * 0.1 */
2028 ihaka 279 
    case sigma11: /* denom1 */
27236 murrell 280 
	return	- AxisHeight(gc, dd)
31989 ripley 281 
	    + 3.51 * RuleThickness()
27236 murrell 282 
	    + SUBS * FigHeight(gc, dd)
283 
	    + 0.344444 * XHeight(gc, dd);	/* 124/36 * 0.1 */
2028 ihaka 284 
    case sigma12: /* denom2 */
27236 murrell 285 
	return	- AxisHeight(gc, dd)
31989 ripley 286 
	    + 1.51 * RuleThickness()
27236 murrell 287 
	    + SUBS * FigHeight(gc, dd)
288 
	    + 0.08333333 * XHeight(gc, dd);	/* 30/36 * 0.1 */
2028 ihaka 289 
 
290 
    case sigma13: /* sup1 */
27236 murrell 291 
	return 0.95 * xHeight(gc, dd);
2028 ihaka 292 
    case sigma14: /* sup2 */
27236 murrell 293 
	return 0.825 * xHeight(gc, dd);
2028 ihaka 294 
    case sigma15: /* sup3 */
27236 murrell 295 
	return 0.7 * xHeight(gc, dd);
2028 ihaka 296 
 
297 
    case sigma16: /* sub1 */
27236 murrell 298 
	return 0.35 * xHeight(gc, dd);
2028 ihaka 299 
    case sigma17: /* sub2 */
27236 murrell 300 
	return 0.45 * XHeight(gc, dd);
2028 ihaka 301 
 
302 
    case sigma18: /* sup_drop */
27236 murrell 303 
	return 0.3861111 * XHeight(gc, dd);
2028 ihaka 304 
 
305 
    case sigma19: /* sub_drop */
27236 murrell 306 
	return 0.05 * XHeight(gc, dd);
2028 ihaka 307 
 
308 
    case sigma20: /* delim1 */
27236 murrell 309 
	return 2.39 * XHeight(gc, dd);
2028 ihaka 310 
    case sigma21: /* delim2 */
27236 murrell 311 
	return 1.01 *XHeight(gc, dd);
2028 ihaka 312 
 
313 
    case sigma22: /* axis_height */
27236 murrell 314 
	return AxisHeight(gc, dd);
2028 ihaka 315 
 
3475 pd 316 
    case xi8:	  /* default_rule_thickness */
31989 ripley 317 
	return RuleThickness();
2028 ihaka 318 
 
3475 pd 319 
    case xi9:	  /* big_op_spacing1 */
320 
    case xi10:	  /* big_op_spacing2 */
321 
    case xi11:	  /* big_op_spacing3 */
322 
    case xi12:	  /* big_op_spacing4 */
323 
    case xi13:	  /* big_op_spacing5 */
27236 murrell 324 
	return 0.15 * XHeight(gc, dd);
2692 maechler 325 
    default:/* never happens (enum type) */
32871 ripley 326 
	error(_("invalid `which' in TeX")); return 0;/*-Wall*/
2028 ihaka 327 
    }
328 
}
329 
 
27236 murrell 330 
static STYLE GetStyle(mathContext *mc)
2028 ihaka 331 
{
27236 murrell 332 
    return mc->CurrentStyle;
2028 ihaka 333 
}
334 
 
27236 murrell 335 
static void SetStyle(STYLE newstyle, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 336 
{
2122 maechler 337 
    switch (newstyle) {
2028 ihaka 338 
    case STYLE_D:
339 
    case STYLE_T:
340 
    case STYLE_D1:
341 
    case STYLE_T1:
27236 murrell 342 
	gc->cex = 1.0 * mc->BaseCex;
2028 ihaka 343 
	break;
344 
    case STYLE_S:
345 
    case STYLE_S1:
27236 murrell 346 
	gc->cex = 0.7 * mc->BaseCex;
2028 ihaka 347 
	break;
348 
    case STYLE_SS:
349 
    case STYLE_SS1:
27236 murrell 350 
	gc->cex = 0.5 * mc->BaseCex;
2028 ihaka 351 
	break;
352 
    default:
32871 ripley 353 
	error(_("invalid math style encountered"));
2028 ihaka 354 
    }
27236 murrell 355 
    mc->CurrentStyle = newstyle;
2028 ihaka 356 
}
357 
 
27236 murrell 358 
static void SetPrimeStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 359 
{
360 
    switch (style) {
361 
    case STYLE_D:
362 
    case STYLE_D1:
27236 murrell 363 
	SetStyle(STYLE_D1, mc, gc);
2028 ihaka 364 
	break;
365 
    case STYLE_T:
366 
    case STYLE_T1:
27236 murrell 367 
	SetStyle(STYLE_T1, mc, gc);
2028 ihaka 368 
	break;
369 
    case STYLE_S:
370 
    case STYLE_S1:
27236 murrell 371 
	SetStyle(STYLE_S1, mc, gc);
2028 ihaka 372 
	break;
373 
    case STYLE_SS:
374 
    case STYLE_SS1:
27236 murrell 375 
	SetStyle(STYLE_SS1, mc, gc);
2028 ihaka 376 
	break;
377 
    }
378 
}
379 
 
27236 murrell 380 
static void SetSupStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 381 
{
382 
    switch (style) {
383 
    case STYLE_D:
384 
    case STYLE_T:
27236 murrell 385 
	SetStyle(STYLE_S, mc, gc);
2028 ihaka 386 
	break;
387 
    case STYLE_D1:
388 
    case STYLE_T1:
27236 murrell 389 
	SetStyle(STYLE_S1, mc, gc);
2028 ihaka 390 
	break;
391 
    case STYLE_S:
392 
    case STYLE_SS:
27236 murrell 393 
	SetStyle(STYLE_SS, mc, gc);
2028 ihaka 394 
	break;
395 
    case STYLE_S1:
396 
    case STYLE_SS1:
27236 murrell 397 
	SetStyle(STYLE_SS1, mc, gc);
2028 ihaka 398 
	break;
399 
    }
400 
}
401 
 
27236 murrell 402 
static void SetSubStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 403 
{
404 
    switch (style) {
405 
    case STYLE_D:
406 
    case STYLE_T:
407 
    case STYLE_D1:
408 
    case STYLE_T1:
27236 murrell 409 
	SetStyle(STYLE_S1, mc, gc);
2028 ihaka 410 
	break;
411 
    case STYLE_S:
412 
    case STYLE_SS:
413 
    case STYLE_S1:
414 
    case STYLE_SS1:
27236 murrell 415 
	SetStyle(STYLE_SS1, mc, gc);
2028 ihaka 416 
	break;
417 
    }
418 
}
419 
 
27236 murrell 420 
static void SetNumStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 421 
{
422 
    switch (style) {
423 
    case STYLE_D:
27236 murrell 424 
	SetStyle(STYLE_T, mc, gc);
2028 ihaka 425 
	break;
426 
    case STYLE_D1:
27236 murrell 427 
	SetStyle(STYLE_T1, mc, gc);
2028 ihaka 428 
	break;
429 
    default:
27236 murrell 430 
	SetSupStyle(style, mc, gc);
2028 ihaka 431 
    }
432 
}
433 
 
27236 murrell 434 
static void SetDenomStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 435 
{
436 
    if (style > STYLE_T)
27236 murrell 437 
	SetStyle(STYLE_T1, mc, gc);
1839 ihaka 438 
    else
27236 murrell 439 
	SetSubStyle(style, mc, gc);
2 r 440 
}
441 
 
27236 murrell 442 
static int IsCompactStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2 r 443 
{
2028 ihaka 444 
    switch (style) {
445 
    case STYLE_D1:
446 
    case STYLE_T1:
447 
    case STYLE_S1:
448 
    case STYLE_SS1:
449 
	return 1;
450 
    default:
451 
	return 0;
452 
    }
2 r 453 
}
454 
 
2028 ihaka 455 
 
456 
#ifdef max
457 
#undef max
458 
#endif
459 
/* Return maximum of two doubles. */
460 
static double max(double x, double y)
2 r 461 
{
2028 ihaka 462 
    if (x > y) return x;
463 
    else return y;
2 r 464 
}
465 
 
2028 ihaka 466 
 
467 
/* Bounding Boxes */
468 
/* These including italic corrections and an */
469 
/* indication of whether the nucleus was simple. */
470 
 
471 
typedef struct {
472 
    double height;
473 
    double depth;
474 
    double width;
475 
    double italic;
476 
    int simple;
477 
} BBOX;
478 
 
479 
 
480 
#define bboxHeight(bbox) bbox.height
481 
#define bboxDepth(bbox) bbox.depth
482 
#define bboxWidth(bbox) bbox.width
483 
#define bboxItalic(bbox) bbox.italic
484 
#define bboxSimple(bbox) bbox.simple
485 
 
486 
 
487 
static BBOX MakeBBox(double height, double depth, double width)
2 r 488 
{
2028 ihaka 489 
    BBOX bbox;
490 
    bboxHeight(bbox) = height;
491 
    bboxDepth(bbox)  = depth;
492 
    bboxWidth(bbox)  = width;
493 
    bboxItalic(bbox) = 0;
494 
    bboxSimple(bbox) = 0;
495 
    return bbox;
2 r 496 
}
497 
 
2028 ihaka 498 
static BBOX NullBBox()
2 r 499 
{
2028 ihaka 500 
    BBOX bbox;
501 
    bboxHeight(bbox) = 0;
502 
    bboxDepth(bbox)  = 0;
503 
    bboxWidth(bbox)  = 0;
504 
    bboxItalic(bbox) = 0;
505 
    bboxSimple(bbox) = 0;
506 
    return bbox;
2 r 507 
}
508 
 
2028 ihaka 509 
static BBOX ShiftBBox(BBOX bbox1, double shiftV)
2 r 510 
{
2028 ihaka 511 
    bboxHeight(bbox1) = bboxHeight(bbox1) + shiftV;
512 
    bboxDepth(bbox1)  = bboxDepth(bbox1) - shiftV;
513 
    bboxWidth(bbox1)  = bboxWidth(bbox1);
514 
    bboxItalic(bbox1) = bboxItalic(bbox1);
515 
    bboxSimple(bbox1) = bboxSimple(bbox1);
516 
    return bbox1;
2 r 517 
}
518 
 
2028 ihaka 519 
static BBOX EnlargeBBox(BBOX bbox, double deltaHeight, double deltaDepth,
520 
		      double deltaWidth)
2 r 521 
{
2028 ihaka 522 
    bboxHeight(bbox) += deltaHeight;
523 
    bboxDepth(bbox)  += deltaDepth;
524 
    bboxWidth(bbox)  += deltaWidth;
525 
    return bbox;
2 r 526 
}
527 
 
2028 ihaka 528 
static BBOX CombineBBoxes(BBOX bbox1, BBOX bbox2)
529 
{
530 
    bboxHeight(bbox1) = max(bboxHeight(bbox1), bboxHeight(bbox2));
531 
    bboxDepth(bbox1)  = max(bboxDepth(bbox1), bboxDepth(bbox2));
532 
    bboxWidth(bbox1)  = bboxWidth(bbox1) + bboxWidth(bbox2);
533 
    bboxItalic(bbox1) = bboxItalic(bbox2);
534 
    bboxSimple(bbox1) = bboxSimple(bbox2);
535 
    return bbox1;
536 
}
537 
 
538 
static BBOX CombineAlignedBBoxes(BBOX bbox1, BBOX bbox2)
539 
{
540 
    bboxHeight(bbox1) = max(bboxHeight(bbox1), bboxHeight(bbox2));
541 
    bboxDepth(bbox1)  = max(bboxDepth(bbox1), bboxDepth(bbox2));
542 
    bboxWidth(bbox1)  = max(bboxWidth(bbox1), bboxWidth(bbox2));
543 
    bboxItalic(bbox1) = 0;
544 
    bboxSimple(bbox1) = 0;
545 
    return bbox1;
546 
}
547 
 
548 
static BBOX CombineOffsetBBoxes(BBOX bbox1, int italic1,
549 
				BBOX bbox2, int italic2,
550 
				double xoffset,
551 
				double yoffset)
552 
{
553 
    double width1 = bboxWidth(bbox1) + (italic1 ? bboxItalic(bbox1) : 0);
554 
    double width2 = bboxWidth(bbox2) + (italic2 ? bboxItalic(bbox2) : 0);
555 
    bboxWidth(bbox1) = max(width1, width2 + xoffset);
556 
    bboxHeight(bbox1) = max(bboxHeight(bbox1), bboxHeight(bbox2) + yoffset);
557 
    bboxDepth(bbox1) = max(bboxDepth(bbox1), bboxDepth(bbox2) - yoffset);
558 
    bboxItalic(bbox1) = 0;
559 
    bboxSimple(bbox1) = 0;
560 
    return bbox1;
561 
}
562 
 
563 
static double CenterShift(BBOX bbox)
564 
{
565 
    return 0.5 * (bboxHeight(bbox) - bboxDepth(bbox));
566 
}
567 
 
3475 pd 568 
#ifdef NOT_used_currently/*-- out 'def'	 (-Wall) --*/
27236 murrell 569 
static BBOX DrawBBox(BBOX bbox, double xoffset, double yoffset,
570 
		     mathContext *mc, R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 571 
{
27236 murrell 572 
    double xsaved = mc->CurrentX;
573 
    double ysaved = mc->CurrentY;
2028 ihaka 574 
    double x[5], y[5];
27236 murrell 575 
    int savedcol = gc->col;
576 
    int savedlty = gc->lty;
577 
    double savedlwd = gc->lwd;
578 
    mc->CurrentX += xoffset;
579 
    mc->CurrentY += yoffset;
580 
    PMoveUp(-bboxDepth(bbox), mc);
581 
    x[4] = x[0] = ConvertedX(mc, dd);
582 
    y[4] = y[0] = ConvertedY(mc, dd);
583 
    PMoveAcross(bboxWidth(bbox), mc);
584 
    x[1] = ConvertedX(mc, dd);
585 
    y[1] = ConvertedY(mc, dd);
586 
    PMoveUp(bboxHeight(bbox) + bboxDepth(bbox), mc);
587 
    x[2] = ConvertedX(mc, dd);
588 
    y[2] = ConvertedY(mc, dd);
589 
    PMoveAcross(-bboxWidth(bbox), mc);
590 
    x[3] = ConvertedX(mc, dd);
591 
    y[3] = ConvertedY(mc, dd);
592 
    gc->col = mc->BoxColor;
593 
    gc->lty = LTY_SOLID;
37301 murrell 594 
    /*
595 
     * We used to just force lwd = 1, which is a reasonable sanity check
596 
     * because if the user had set lwd = 10 for something, your
597 
     * mathematical annotation would look REALLY bad.
598 
     * Unfortunately, this meant that the user could not set a nice
599 
     * small lwd to get a finer line;  we always bumped it back up to 1.
600 
     * NOW we just reduce lwd to 1 (as a sanity check) ONLY if
601 
     * lwd is greater than 1.
602 
     */
603 
    if (gc->lwd > 1)
604 
	gc->lwd = 1;
27236 murrell 605 
    GEPolyline(5, x, y, gc, dd);
606 
    PMoveTo(xsaved, ysaved, mc);
607 
    gc->col = savedcol;
608 
    gc->lty = savedlty;
609 
    gc->lwd = savedlwd;
2028 ihaka 610 
    return bbox;
611 
}
2124 maechler 612 
#endif
2028 ihaka 613 
 
614 
typedef struct {
615 
    char *name;
616 
    int code;
617 
} SymTab;
618 
 
619 
/* Determine a match between symbol name and string. */
620 
 
41781 ripley 621 
static int NameMatch(SEXP expr, const char *aString)
2028 ihaka 622 
{
6994 pd 623 
    if (!isSymbol(expr)) return 0;
2028 ihaka 624 
    return !strcmp(CHAR(PRINTNAME(expr)), aString);
625 
}
626 
 
41781 ripley 627 
static int StringMatch(SEXP expr, const char *aString)
2028 ihaka 628 
{
40705 ripley 629 
    return !strcmp(translateChar(STRING_ELT(expr, 0)), aString);
2028 ihaka 630 
}
631 
/* Code to determine the ascii code corresponding */
632 
/* to an element of a mathematical expression. */
633 
 
3475 pd 634 
#define A_HAT		  94
635 
#define A_TILDE		 126
2028 ihaka 636 
 
3475 pd 637 
#define S_SPACE		  32
638 
#define S_PARENLEFT	  40
639 
#define S_PARENRIGHT	  41
640 
#define S_ASTERISKMATH	  42
641 
#define S_COMMA		  44
642 
#define S_SLASH		  47
643 
#define S_RADICALEX	  96
644 
#define S_FRACTION	 164
645 
#define S_ELLIPSIS	 188
646 
#define S_INTERSECTION	 199
647 
#define S_UNION		 200
648 
#define S_PRODUCT	 213
649 
#define S_RADICAL	 214
650 
#define S_SUM		 229
651 
#define S_INTEGRAL	 242
652 
#define S_BRACKETLEFTTP	 233
653 
#define S_BRACKETLEFTBT	 235
2028 ihaka 654 
#define S_BRACKETRIGHTTP 249
655 
#define S_BRACKETRIGHTBT 251
656 
 
3475 pd 657 
#define N_LIM		1001
658 
#define N_LIMINF	1002
659 
#define N_LIMSUP	1003
660 
#define N_INF		1004
661 
#define N_SUP		1005
662 
#define N_MIN		1006
663 
#define N_MAX		1007
2028 ihaka 664 
 
665 
 
666 
/* The Full Adobe Symbol Font */
667 
 
7081 pd 668 
static SymTab
1926 ihaka 669 
SymbolTable[] = {
3865 pd 670 
    { "space",		 32 },
671 
    { "exclam",		 33 },
672 
    { "universal",	 34 },
673 
    { "numbersign",	 35 },
674 
    { "existential",	 36 },
675 
    { "percent",	 37 },
676 
    { "ampersand",	 38 },
677 
    { "suchthat",	 39 },
678 
    { "parenleft",	 40 },
679 
    { "parenright",	 41 },
680 
    { "asteriskmath",	 42 },
681 
    { "plus",		 43 },
682 
    { "comma",		 44 },
683 
    { "minus",		 45 },
684 
    { "period",		 46 },
685 
    { "slash",		 47 },
686 
    { "0",		 48 },
687 
    { "1",		 49 },
688 
    { "2",		 50 },
689 
    { "3",		 51 },
690 
    { "4",		 52 },
691 
    { "5",		 53 },
692 
    { "6",		 54 },
693 
    { "7",		 55 },
694 
    { "8",		 56 },
695 
    { "9",		 57 },
696 
    { "colon",		 58 },
697 
    { "semicolon",	 59 },
698 
    { "less",		 60 },
699 
    { "equal",		 61 },
700 
    { "greater",	 62 },
701 
    { "question",	 63 },
702 
    { "congruent",	 64 },
2028 ihaka 703 
 
7081 pd 704 
    { "Alpha",/* 0101= */65 }, /* Upper Case Greek Characters */
3865 pd 705 
    { "Beta",		 66 },
706 
    { "Chi",		 67 },
707 
    { "Delta",		 68 },
708 
    { "Epsilon",	 69 },
709 
    { "Phi",		 70 },
710 
    { "Gamma",		 71 },
711 
    { "Eta",		 72 },
712 
    { "Iota",		 73 },
713 
    { "theta1",		 74 },
36211 ripley 714 
    { "vartheta",	 74 },
3865 pd 715 
    { "Kappa",		 75 },
716 
    { "Lambda",		 76 },
717 
    { "Mu",		 77 },
718 
    { "Nu",		 78 },
719 
    { "Omicron",	 79 },
720 
    { "Pi",		 80 },
721 
    { "Theta",		 81 },
722 
    { "Rho",		 82 },
723 
    { "Sigma",		 83 },
724 
    { "Tau",		 84 },
725 
    { "Upsilon",	 85 },
726 
    { "sigma1",		 86 },
36211 ripley 727 
    { "varsigma",	 86 },
36214 ripley 728 
    { "stigma",		 86 },
3865 pd 729 
    { "Omega",		 87 },
730 
    { "Xi",		 88 },
731 
    { "Psi",		 89 },
7081 pd 732 
    { "Zeta",/* 0132 = */90 },
2 r 733 
 
3865 pd 734 
    { "bracketleft",	 91 },	/* Miscellaneous Special Characters */
735 
    { "therefore",	 92 },
736 
    { "bracketright",	 93 },
737 
    { "perpendicular",	 94 },
738 
    { "underscore",	 95 },
739 
    { "radicalex",	 96 },
2028 ihaka 740 
 
7081 pd 741 
    { "alpha",/* 0141= */97 },	/* Lower Case Greek Characters */
3865 pd 742 
    { "beta",		 98 },
743 
    { "chi",		 99 },
744 
    { "delta",		100 },
745 
    { "epsilon",	101 },
746 
    { "phi",		102 },
747 
    { "gamma",		103 },
748 
    { "eta",		104 },
749 
    { "iota",		105 },
750 
    { "phi1",		106 },
36210 ripley 751 
    { "varphi",		106 },
3865 pd 752 
    { "kappa",		107 },
753 
    { "lambda",		108 },
754 
    { "mu",		109 },
755 
    { "nu",		110 },
756 
    { "omicron",	111 },
757 
    { "pi",		112 },
758 
    { "theta",		113 },
759 
    { "rho",		114 },
760 
    { "sigma",		115 },
761 
    { "tau",		116 },
762 
    { "upsilon",	117 },
763 
    { "omega1",		118 },
764 
    { "omega",		119 },
765 
    { "xi",		120 },
766 
    { "psi",		121 },
7081 pd 767 
    { "zeta",/* 0172= */122 },
2 r 768 
 
3865 pd 769 
    { "braceleft",	123 },	/* Miscellaneous Special Characters */
770 
    { "bar",		124 },
771 
    { "braceright",	125 },
772 
    { "similar",	126 },
2028 ihaka 773 
 
3865 pd 774 
    { "Upsilon1",	161 },	/* Lone Greek */
775 
    { "minute",		162 },
776 
    { "lessequal",	163 },
777 
    { "fraction",	164 },
778 
    { "infinity",	165 },
779 
    { "florin",		166 },
780 
    { "club",		167 },
781 
    { "diamond",	168 },
782 
    { "heart",		169 },
783 
    { "spade",		170 },
784 
    { "arrowboth",	171 },
785 
    { "arrowleft",	172 },
786 
    { "arrowup",	173 },
787 
    { "arrowright",	174 },
788 
    { "arrowdown",	175 },
789 
    { "degree",		176 },
790 
    { "plusminus",	177 },
791 
    { "second",		178 },
792 
    { "greaterequal",	179 },
793 
    { "multiply",	180 },
794 
    { "proportional",	181 },
795 
    { "partialdiff",	182 },
796 
    { "bullet",		183 },
797 
    { "divide",		184 },
798 
    { "notequal",	185 },
799 
    { "equivalence",	186 },
800 
    { "approxequal",	187 },
801 
    { "ellipsis",	188 },
802 
    { "arrowvertex",	189 },
803 
    { "arrowhorizex",	190 },
804 
    { "carriagereturn", 191 },
805 
    { "aleph",		192 },
806 
    { "Ifraktur",	193 },
807 
    { "Rfraktur",	194 },
808 
    { "weierstrass",	195 },
809 
    { "circlemultiply", 196 },
810 
    { "circleplus",	197 },
811 
    { "emptyset",	198 },
7081 pd 812 
    { "intersection",	199 },/* = 0307 */
813 
    { "union",		200 },/* = 0310 */
3865 pd 814 
    { "propersuperset", 201 },
815 
    { "reflexsuperset", 202 },
816 
    { "notsubset",	203 },
817 
    { "propersubset",	204 },
818 
    { "reflexsubset",	205 },
819 
    { "element",	206 },
820 
    { "notelement",	207 },
821 
    { "angle",		208 },
822 
    { "gradient",	209 },
823 
    { "registerserif",	210 },
824 
    { "copyrightserif", 211 },
825 
    { "trademarkserif", 212 },
826 
    { "product",	213 },
827 
    { "radical",	214 },
828 
    { "dotmath",	215 },
829 
    { "logicaland",	217 },
830 
    { "logicalor",	218 },
831 
    { "arrowdblboth",	219 },
832 
    { "arrowdblleft",	220 },
833 
    { "arrowdblup",	221 },
834 
    { "arrowdblright",	222 },
835 
    { "arrowdbldown",	223 },
836 
    { "lozenge",	224 },
837 
    { "angleleft",	225 },
838 
    { "registersans",	226 },
839 
    { "copyrightsans",	227 },
840 
    { "trademarksans",	228 },
841 
    { "summation",	229 },
842 
    { "parenlefttp",	230 },
843 
    { "parenleftex",	231 },
844 
    { "parenleftbt",	232 },
845 
    { "bracketlefttp",	233 },
846 
    { "bracketleftex",	234 },
847 
    { "bracketleftbt",	235 },
848 
    { "bracelefttp",	236 },
849 
    { "braceleftmid",	237 },
850 
    { "braceleftbt",	238 },
851 
    { "braceex",	239 },
852 
    { "angleright",	241 },
853 
    { "integral",	242 },
854 
    { "integraltp",	243 },
855 
    { "integralex",	244 },
856 
    { "integralbt",	245 },
857 
    { "parenrighttp",	246 },
858 
    { "parenrightex",	247 },
859 
    { "parenrightbt",	248 },
860 
    { "bracketrighttp", 249 },
861 
    { "bracketrightex", 250 },
862 
    { "bracketrightbt", 251 },
863 
    { "bracerighttp",	252 },
864 
    { "bracerightmid",	253 },
865 
    { "bracerightbt",	254 },
2 r 866 
 
3865 pd 867 
    { NULL,		  0 },
2 r 868 
};
869 
 
2028 ihaka 870 
static int SymbolCode(SEXP expr)
2 r 871 
{
1839 ihaka 872 
    int i;
1926 ihaka 873 
    for (i = 0; SymbolTable[i].code; i++)
2028 ihaka 874 
	if (NameMatch(expr, SymbolTable[i].name))
1926 ihaka 875 
	    return SymbolTable[i].code;
1839 ihaka 876 
    return 0;
877 
}
2 r 878 
 
36356 maechler 879 
/* this is the one really used: */
2028 ihaka 880 
static int TranslatedSymbol(SEXP expr)
1839 ihaka 881 
{
2028 ihaka 882 
    int code = SymbolCode(expr);
3475 pd 883 
    if ((0101 <= code && code <= 0132)	||   /* Greek */
884 
	(0141 <= code && code <= 0172)	||   /* Greek */
7081 pd 885 
	code == 0241			||   /* Upsilon1 */
3475 pd 886 
	code == 0242			||   /* minute */
887 
	code == 0245			||   /* infinity */
888 
	code == 0260			||   /* degree */
889 
	code == 0262			||   /* second */
19598 ripley 890 
	code == 0266                    ||   /* partialdiff */
2028 ihaka 891 
	0)
892 
	return code;
893 
    else
894 
	return 0;
2 r 895 
}
896 
 
1839 ihaka 897 
/* Code to determine the nature of an expression. */
2 r 898 
 
2028 ihaka 899 
static int FormulaExpression(SEXP expr)
2 r 900 
{
1839 ihaka 901 
    return (TYPEOF(expr) == LANGSXP);
2 r 902 
}
903 
 
2028 ihaka 904 
static int NameAtom(SEXP expr)
2 r 905 
{
1839 ihaka 906 
    return (TYPEOF(expr) == SYMSXP);
2 r 907 
}
908 
 
2028 ihaka 909 
static int NumberAtom(SEXP expr)
2 r 910 
{
1839 ihaka 911 
    return ((TYPEOF(expr) == REALSXP) ||
912 
	    (TYPEOF(expr) == INTSXP)  ||
913 
	    (TYPEOF(expr) == CPLXSXP));
2 r 914 
}
915 
 
2028 ihaka 916 
static int StringAtom(SEXP expr)
2 r 917 
{
1839 ihaka 918 
    return (TYPEOF(expr) == STRSXP);
2 r 919 
}
920 
 
3475 pd 921 
#ifdef NOT_used_currently/*-- out 'def'	 (-Wall) --*/
2028 ihaka 922 
static int symbolAtom(SEXP expr)
1926 ihaka 923 
{
924 
    int i;
2028 ihaka 925 
    if (NameAtom(expr)) {
926 
	for (i = 0; SymbolTable[i].code; i++)
927 
	    if (NameMatch(expr, SymbolTable[i].name))
928 
		return 1;
929 
    }
1926 ihaka 930 
    return 0;
2 r 931 
}
2124 maechler 932 
#endif
2028 ihaka 933 
/* Code to determine a font from the */
934 
/* nature of the expression */
2 r 935 
 
3475 pd 936 
#ifdef NOT_used_currently/*-- out 'def'	 (-Wall) --*/
27236 murrell 937 
static FontType mc->CurrentFont = 3;
2124 maechler 938 
#endif
27236 murrell 939 
static FontType GetFont(R_GE_gcontext *gc)
2 r 940 
{
27236 murrell 941 
    return gc->fontface;
2 r 942 
}
943 
 
27236 murrell 944 
static FontType SetFont(FontType font, R_GE_gcontext *gc)
2 r 945 
{
27236 murrell 946 
    FontType prevfont = gc->fontface;
947 
    gc->fontface = font;
2028 ihaka 948 
    return prevfont;
2 r 949 
}
950 
 
27236 murrell 951 
static int UsingItalics(R_GE_gcontext *gc)
2 r 952 
{
27236 murrell 953 
    return (gc->fontface == ItalicFont ||
954 
	    gc->fontface == BoldItalicFont);
2 r 955 
}
956 
 
27236 murrell 957 
static BBOX GlyphBBox(int chr, R_GE_gcontext *gc, GEDevDesc *dd)
2 r 958 
{
2028 ihaka 959 
    BBOX bbox;
960 
    double height, depth, width;
27236 murrell 961 
    GEMetricInfo(chr, gc,
962 
		&height, &depth, &width, dd);
963 
    bboxHeight(bbox) = fromDeviceHeight(height, MetricUnit, dd);
964 
    bboxDepth(bbox)  = fromDeviceHeight(depth, MetricUnit, dd);
965 
    bboxWidth(bbox)  = fromDeviceHeight(width, MetricUnit, dd);
2028 ihaka 966 
    bboxItalic(bbox) = 0;
967 
    bboxSimple(bbox) = 1;
968 
    return bbox;
2 r 969 
}
970 
 
27236 murrell 971 
static BBOX RenderElement(SEXP, int,
972 
			  mathContext*, R_GE_gcontext*, GEDevDesc*);
973 
static BBOX RenderOffsetElement(SEXP, double, double, int,
974 
				mathContext*, R_GE_gcontext*, GEDevDesc*);
975 
static BBOX RenderExpression(SEXP, int,
976 
			     mathContext*, R_GE_gcontext*, GEDevDesc*);
32392 ripley 977 
static BBOX RenderSymbolChar(int, int,
27236 murrell 978 
			     mathContext*, R_GE_gcontext*, GEDevDesc*);
2 r 979 
 
980 
 
3475 pd 981 
/*  Code to Generate Bounding Boxes and Draw Formulae.	*/
2 r 982 
 
32392 ripley 983 
static BBOX RenderItalicCorr(BBOX bbox, int draw, mathContext *mc,
984 
			     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 985 
{
2028 ihaka 986 
    if (bboxItalic(bbox) > 0) {
987 
	if (draw)
27236 murrell 988 
	    PMoveAcross(bboxItalic(bbox), mc);
2028 ihaka 989 
	bboxWidth(bbox) += bboxItalic(bbox);
990 
	bboxItalic(bbox) = 0;
991 
    }
992 
    return bbox;
2 r 993 
}
994 
 
32392 ripley 995 
static BBOX RenderGap(double gap, int draw, mathContext *mc,
996 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 997 
{
2028 ihaka 998 
    if (draw)
27236 murrell 999 
	PMoveAcross(gap, mc);
2028 ihaka 1000 
    return MakeBBox(0, 0, gap);
2 r 1001 
}
1002 
 
34632 ripley 1003 
/* Draw a Symbol from the Special Font:
1004 
   this is assumed to be 8-bit encoded in Adobe Symbol.
1005 
 */
2 r 1006 
 
32392 ripley 1007 
static BBOX RenderSymbolChar(int ascii, int draw, mathContext *mc,
1008 
			     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1009 
{
2028 ihaka 1010 
    FontType prev;
1011 
    BBOX bbox;
1012 
    char asciiStr[2];
1013 
    if (ascii == A_HAT || ascii == A_TILDE)
27236 murrell 1014 
	prev = SetFont(PlainFont, gc);
2028 ihaka 1015 
    else
27236 murrell 1016 
	prev = SetFont(SymbolFont, gc);
1017 
    bbox = GlyphBBox(ascii, gc, dd);
2028 ihaka 1018 
    if (draw) {
1019 
	asciiStr[0] = ascii;
1020 
	asciiStr[1] = '\0';
32392 ripley 1021 
	GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), asciiStr,
27236 murrell 1022 
	       0.0, 0.0, mc->CurrentAngle, gc,
1023 
	       dd);
1024 
	PMoveAcross(bboxWidth(bbox), mc);
2028 ihaka 1025 
    }
27236 murrell 1026 
    SetFont(prev, gc);
2028 ihaka 1027 
    return bbox;
2 r 1028 
}
1029 
 
34632 ripley 1030 
/* Draw a Symbol String in "Math Mode" */
2028 ihaka 1031 
/* This code inserts italic corrections after */
1032 
/* every character. */
2 r 1033 
 
41781 ripley 1034 
static BBOX RenderSymbolStr(const char *str, int draw, mathContext *mc,
32392 ripley 1035 
			    R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1036 
{
41781 ripley 1037 
    char chr[7] = "";
1038 
    const char *s = str;
2028 ihaka 1039 
    BBOX glyphBBox;
1040 
    BBOX resultBBox = NullBBox();
1041 
    double lastItalicCorr = 0;
27236 murrell 1042 
    FontType prevfont = GetFont(gc);
2028 ihaka 1043 
    FontType font = prevfont;
34632 ripley 1044 
 
2028 ihaka 1045 
    if (str) {
34632 ripley 1046 
#ifdef SUPPORT_MBCS
1047 
	if(mbcslocale) {  /* need to advance by character, not byte */
1048 
	    wchar_t wc;
1049 
	    mbstate_t mb_st;
1050 
	    size_t res;
36356 maechler 1051 
 
34632 ripley 1052 
	    memset(&mb_st, 0, sizeof(mb_st));
1053 
	    while (*s) {
1054 
		wc = 0;
1055 
		res = mbrtowc(&wc, s, MB_LEN_MAX, &mb_st);
39507 ripley 1056 
		if(res == -1) error("invalid multibyte string");
34632 ripley 1057 
		if (iswdigit(wc) && font != PlainFont) {
1058 
		    font = PlainFont;
1059 
		    SetFont(PlainFont, gc);
1060 
		}
1061 
		else if (font != prevfont) {
1062 
		    font = prevfont;
1063 
		    SetFont(prevfont, gc);
1064 
		}
1065 
		glyphBBox = GlyphBBox((int)wc, gc, dd);
1066 
		if (UsingItalics(gc))
1067 
		    bboxItalic(glyphBBox) =
1068 
			ItalicFactor * bboxHeight(glyphBBox);
1069 
		else
1070 
		    bboxItalic(glyphBBox) = 0;
1071 
		if (draw) {
1072 
		    memset(chr, 0, sizeof(chr));
39507 ripley 1073 
		    res  = wcrtomb(chr, wc, &mb_st);
1074 
		    if(res == -1) error("invalid multibyte string");
34632 ripley 1075 
		    PMoveAcross(lastItalicCorr, mc);
1076 
		    GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), chr,
1077 
			   0.0, 0.0, mc->CurrentAngle, gc,
1078 
			   dd);
1079 
		    PMoveAcross(bboxWidth(glyphBBox), mc);
1080 
		}
1081 
		bboxWidth(resultBBox) += lastItalicCorr;
1082 
		resultBBox = CombineBBoxes(resultBBox, glyphBBox);
1083 
		lastItalicCorr = bboxItalic(glyphBBox);
1084 
		s += res;
2028 ihaka 1085 
	    }
34632 ripley 1086 
	} else
1087 
#endif
1088 
	{
1089 
	    while (*s) {
1090 
		if (isdigit((int)*s) && font != PlainFont) {
1091 
		    font = PlainFont;
1092 
		    SetFont(PlainFont, gc);
1093 
		}
1094 
		else if (font != prevfont) {
1095 
		    font = prevfont;
1096 
		    SetFont(prevfont, gc);
1097 
		}
1098 
		glyphBBox = GlyphBBox(*s, gc, dd);
1099 
		if (UsingItalics(gc))
1100 
		    bboxItalic(glyphBBox) =
1101 
			ItalicFactor * bboxHeight(glyphBBox);
1102 
		else
1103 
		    bboxItalic(glyphBBox) = 0;
1104 
		if (draw) {
1105 
		    chr[0] = *s;
1106 
		    PMoveAcross(lastItalicCorr, mc);
1107 
		    GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), chr,
1108 
			   0.0, 0.0, mc->CurrentAngle, gc,
1109 
			   dd);
1110 
		    PMoveAcross(bboxWidth(glyphBBox), mc);
1111 
		}
1112 
		bboxWidth(resultBBox) += lastItalicCorr;
1113 
		resultBBox = CombineBBoxes(resultBBox, glyphBBox);
1114 
		lastItalicCorr = bboxItalic(glyphBBox);
1115 
		s++;
2028 ihaka 1116 
	    }
1117 
	}
1118 
	if (font != prevfont)
27236 murrell 1119 
	    SetFont(prevfont, gc);
2028 ihaka 1120 
    }
1121 
    bboxSimple(resultBBox) = 1;
1122 
    return resultBBox;
2 r 1123 
}
1124 
 
2028 ihaka 1125 
/* Code for Character String Atoms. */
2 r 1126 
 
32397 ripley 1127 
/* This only gets called from RenderAccent */
32392 ripley 1128 
static BBOX RenderChar(int ascii, int draw, mathContext *mc,
1129 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1130 
{
2028 ihaka 1131 
    BBOX bbox;
34632 ripley 1132 
    char asciiStr[7];
1133 
 
27236 murrell 1134 
    bbox = GlyphBBox(ascii, gc, dd);
2028 ihaka 1135 
    if (draw) {
34632 ripley 1136 
        memset(asciiStr, 0, sizeof(asciiStr));
1137 
#ifdef SUPPORT_MBCS
1138 
	if(mbcslocale) {
39507 ripley 1139 
	    size_t res = wcrtomb(asciiStr, ascii, NULL);
1140 
	    if(res == -1)
1141 
		error("invalid character in current multibyte locale");
34632 ripley 1142 
	} else
1143 
#endif
1144 
	    asciiStr[0] = ascii;
27236 murrell 1145 
	GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), asciiStr,
1146 
	       0.0, 0.0, mc->CurrentAngle, gc,
1147 
	       dd);
1148 
	PMoveAcross(bboxWidth(bbox), mc);
2028 ihaka 1149 
    }
1150 
    return bbox;
2 r 1151 
}
1152 
 
32397 ripley 1153 
/* This gets called on strings and PRINTNAMES */
41781 ripley 1154 
static BBOX RenderStr(const char *str, int draw, mathContext *mc,
32392 ripley 1155 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1156 
{
2028 ihaka 1157 
    BBOX glyphBBox;
1158 
    BBOX resultBBox = NullBBox();
43133 ripley 1159 
 
2028 ihaka 1160 
    if (str) {
32624 ripley 1161 
#ifdef SUPPORT_MBCS
43133 ripley 1162 
	if(mbcslocale && gc->fontface != 5) {
1163 
	    int n = strlen(str), used;
1164 
	    wchar_t wc;
1165 
	    const char *p = str;
1166 
	    mbstate_t mb_st;
1167 
	    mbs_init(&mb_st);
1168 
	    while ((used = Mbrtowc(&wc, p, n, &mb_st)) > 0) {
1169 
		glyphBBox = GlyphBBox(wc, gc, dd);
1170 
		resultBBox = CombineBBoxes(resultBBox, glyphBBox);
1171 
		p += used; n -= used;
1172 
	    }
1173 
	} else
43137 ripley 1174 
#endif
43133 ripley 1175 
	{
1176 
	    const char *s = str;
1177 
	    while (*s) {
1178 
		glyphBBox = GlyphBBox(*s, gc, dd);
1179 
		resultBBox = CombineBBoxes(resultBBox, glyphBBox);
1180 
		s++;
1181 
	    }
2028 ihaka 1182 
	}
1183 
	if (draw) {
27236 murrell 1184 
	    GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), str,
43133 ripley 1185 
		   0.0, 0.0, mc->CurrentAngle, gc, dd);
27236 murrell 1186 
	    PMoveAcross(bboxWidth(resultBBox), mc);
2028 ihaka 1187 
	}
27236 murrell 1188 
	if (UsingItalics(gc))
2028 ihaka 1189 
	    bboxItalic(resultBBox) = ItalicFactor * bboxHeight(glyphBBox);
1190 
	else
1191 
	    bboxItalic(resultBBox) = 0;
1192 
    }
1193 
    bboxSimple(resultBBox) = 1;
1194 
    return resultBBox;
2 r 1195 
}
1196 
 
1197 
 
2028 ihaka 1198 
/* Code for Symbol Font Atoms */
2 r 1199 
 
32392 ripley 1200 
static BBOX RenderSymbol(SEXP expr, int draw, mathContext *mc,
1201 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1202 
{
2028 ihaka 1203 
    int code;
2124 maechler 1204 
    if ((code = TranslatedSymbol(expr)))
27236 murrell 1205 
	return RenderSymbolChar(code, draw, mc, gc, dd);
2028 ihaka 1206 
    else
27236 murrell 1207 
	return RenderSymbolStr(CHAR(PRINTNAME(expr)), draw, mc, gc, dd);
2 r 1208 
}
1209 
 
32392 ripley 1210 
static BBOX RenderSymbolString(SEXP expr, int draw, mathContext *mc,
1211 
			       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1212 
{
2028 ihaka 1213 
    int code;
2124 maechler 1214 
    if ((code = TranslatedSymbol(expr)))
27236 murrell 1215 
	return RenderSymbolChar(code, draw, mc, gc, dd);
2028 ihaka 1216 
    else
27236 murrell 1217 
	return RenderStr(CHAR(PRINTNAME(expr)), draw, mc, gc, dd);
2 r 1218 
}
1219 
 
1220 
 
2028 ihaka 1221 
/* Code for Numeric Atoms */
2 r 1222 
 
32392 ripley 1223 
static BBOX RenderNumber(SEXP expr, int draw, mathContext *mc,
1224 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1225 
{
2028 ihaka 1226 
    BBOX bbox;
27236 murrell 1227 
    FontType prevfont = SetFont(PlainFont, gc);
1228 
    bbox = RenderStr(CHAR(asChar(expr)), draw, mc, gc, dd);
1229 
    SetFont(prevfont, gc);
2028 ihaka 1230 
    return bbox;
2 r 1231 
}
1232 
 
2028 ihaka 1233 
/* Code for String Atoms */
2 r 1234 
 
32392 ripley 1235 
static BBOX RenderString(SEXP expr, int draw, mathContext *mc,
1236 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1237 
{
40672 ripley 1238 
    return RenderStr(translateChar(STRING_ELT(expr, 0)), draw, mc, gc, dd);
2 r 1239 
}
1240 
 
2028 ihaka 1241 
/* Code for Ellipsis (ldots, cdots, ...) */
2 r 1242 
 
2028 ihaka 1243 
static int DotsAtom(SEXP expr)
2 r 1244 
{
2028 ihaka 1245 
    if (NameMatch(expr, "cdots") ||
3475 pd 1246 
	NameMatch(expr, "...")	 ||
2028 ihaka 1247 
	NameMatch(expr, "ldots"))
3475 pd 1248 
	    return 1;
2028 ihaka 1249 
    return 0;
2 r 1250 
}
1251 
 
32392 ripley 1252 
static BBOX RenderDots(SEXP expr, int draw, mathContext *mc,
1253 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1254 
{
27236 murrell 1255 
    BBOX bbox = RenderSymbolChar(S_ELLIPSIS, 0, mc, gc, dd);
2028 ihaka 1256 
    if (NameMatch(expr, "cdots") || NameMatch(expr, "...")) {
27236 murrell 1257 
	double shift = AxisHeight(gc, dd) - 0.5 * bboxHeight(bbox);
2028 ihaka 1258 
	if (draw) {
27236 murrell 1259 
	    PMoveUp(shift, mc);
1260 
	    RenderSymbolChar(S_ELLIPSIS, 1, mc, gc, dd);
1261 
	    PMoveUp(-shift, mc);
2028 ihaka 1262 
	}
1263 
	return ShiftBBox(bbox, shift);
1264 
    }
1265 
    else {
1266 
	if (draw)
27236 murrell 1267 
	    RenderSymbolChar(S_ELLIPSIS, 1, mc, gc, dd);
2028 ihaka 1268 
	return bbox;
1269 
    }
2 r 1270 
}
1271 
 
2028 ihaka 1272 
/*----------------------------------------------------------------------
1273 
 *
1274 
 *  Code for Atoms
1275 
 *
1276 
 */
2 r 1277 
 
32392 ripley 1278 
static BBOX RenderAtom(SEXP expr, int draw, mathContext *mc,
1279 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1280 
{
2028 ihaka 1281 
    if (NameAtom(expr)) {
1282 
	if (DotsAtom(expr))
27236 murrell 1283 
	    return RenderDots(expr, draw, mc, gc, dd);
2028 ihaka 1284 
	else
27236 murrell 1285 
	    return RenderSymbol(expr, draw, mc, gc, dd);
2028 ihaka 1286 
    }
1287 
    else if (NumberAtom(expr))
27236 murrell 1288 
	return RenderNumber(expr, draw, mc, gc, dd);
2028 ihaka 1289 
    else if (StringAtom(expr))
27236 murrell 1290 
	return RenderString(expr, draw, mc, gc, dd);
3865 pd 1291 
 
1292 
    return NullBBox();		/* -Wall */
2 r 1293 
}
1294 
 
1295 
 
2028 ihaka 1296 
/*----------------------------------------------------------------------
1297 
 *
1298 
 *  Code for Binary / Unary Operators  (~, +, -, ... )
1299 
 *
1300 
 *  Note that there are unary and binary ~ s.
1301 
 *
1302 
 */
2 r 1303 
 
2028 ihaka 1304 
static int SpaceAtom(SEXP expr)
2 r 1305 
{
2028 ihaka 1306 
    return NameAtom(expr) && NameMatch(expr, "~");
2 r 1307 
}
1308 
 
1309 
 
32392 ripley 1310 
static BBOX RenderSpace(SEXP expr, int draw, mathContext *mc,
1311 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1312 
{
2124 maechler 1313 
 
2028 ihaka 1314 
    BBOX opBBox, arg1BBox, arg2BBox;
1315 
    int nexpr = length(expr);
2 r 1316 
 
2028 ihaka 1317 
    if (nexpr == 2) {
27236 murrell 1318 
	opBBox = RenderSymbolChar(' ', draw, mc, gc, dd);
1319 
	arg1BBox = RenderElement(CADR(expr), draw, mc, gc, dd);
2028 ihaka 1320 
	return CombineBBoxes(opBBox, arg1BBox);
1321 
    }
1322 
    else if (nexpr == 3) {
27236 murrell 1323 
	arg1BBox = RenderElement(CADR(expr), draw, mc, gc, dd);
1324 
	opBBox = RenderSymbolChar(' ', draw, mc, gc, dd);
1325 
	arg2BBox = RenderElement(CADDR(expr), draw, mc, gc, dd);
2028 ihaka 1326 
	opBBox = CombineBBoxes(arg1BBox, opBBox);
1327 
	opBBox = CombineBBoxes(opBBox, arg2BBox);
1328 
	return opBBox;
1329 
    }
1839 ihaka 1330 
    else
32871 ripley 1331 
	error(_("invalid mathematical annotation"));
3865 pd 1332 
 
1333 
    return NullBBox();		/* -Wall */
2 r 1334 
}
1335 
 
2028 ihaka 1336 
static SymTab BinTable[] = {
3865 pd 1337 
    { "*",		 052 },	/* Binary Operators */
1338 
    { "+",		 053 },
1339 
    { "-",		 055 },
1340 
    { "/",		 057 },
1341 
    { ":",		 072 },
1342 
    { "%+-%",		0261 },
1343 
    { "%*%",		0264 },
1344 
    { "%/%",		0270 },
1345 
    { "%intersection%", 0307 },
1346 
    { "%union%",	0310 },
38916 murrell 1347 
    { "%.%",            0327 }, /* cdot or dotmath */
3865 pd 1348 
    { NULL,		   0 }
2028 ihaka 1349 
};
2 r 1350 
 
2028 ihaka 1351 
static int BinAtom(SEXP expr)
2 r 1352 
{
2028 ihaka 1353 
    int i;
7081 pd 1354 
 
2028 ihaka 1355 
    for (i = 0; BinTable[i].code; i++)
1356 
	if (NameMatch(expr, BinTable[i].name))
1357 
	    return BinTable[i].code;
1358 
    return 0;
2 r 1359 
}
1360 
 
2028 ihaka 1361 
#define SLASH2
2 r 1362 
 
32392 ripley 1363 
static BBOX RenderSlash(int draw, mathContext *mc, R_GE_gcontext *gc,
1364 
			GEDevDesc *dd)
2 r 1365 
{
2028 ihaka 1366 
#ifdef SLASH0
1367 
    /* The Default Font Character */
27236 murrell 1368 
    return RenderSymbolChar(S_SLASH, draw, mc, gc, dd);
2 r 1369 
#endif
2028 ihaka 1370 
#ifdef SLASH1
1371 
    /* Symbol Magnify Version */
27236 murrell 1372 
    double savecex = gc->cex;
2028 ihaka 1373 
    BBOX bbox;
1374 
    double height1, height2;
27236 murrell 1375 
    height1 = bboxHeight(RenderSymbolChar(S_SLASH, 0), mc, gc, dd);
1376 
    gc->cex = 1.2 * gc->cex;
1377 
    height2 = bboxHeight(RenderSymbolChar(S_SLASH, 0), mc, gc, dd);
2028 ihaka 1378 
    if (draw)
27236 murrell 1379 
	PMoveUp(- 0.5 * (height2 - height1), mc);
1380 
    bbox = RenderSymbolChar(S_SLASH, draw, mc, gc, dd);
2028 ihaka 1381 
    if (draw)
27236 murrell 1382 
	PMoveUp(0.5 * (height2 - height1), mc);
1383 
    gc->cex = savecex;
2028 ihaka 1384 
    return bbox;
2 r 1385 
#endif
2028 ihaka 1386 
#ifdef SLASH2
1387 
    /* Line Drawing Version */
1388 
    double x[2], y[2];
27236 murrell 1389 
    double depth = 0.5 * TeX(sigma22, gc, dd);
1390 
    double height = XHeight(gc, dd) + 0.5 * TeX(sigma22, gc, dd);
1391 
    double width = 0.5 * xHeight(gc, dd);
2028 ihaka 1392 
    if (draw) {
27236 murrell 1393 
	int savedlty = gc->lty;
1394 
	double savedlwd = gc->lwd;
1395 
	PMoveAcross(0.5 * width, mc);
1396 
	PMoveUp(-depth, mc);
1397 
	x[0] = ConvertedX(mc, dd);
1398 
	y[0] = ConvertedY(mc, dd);
1399 
	PMoveAcross(width, mc);
1400 
	PMoveUp(depth + height, mc);
1401 
	x[1] = ConvertedX(mc, dd);
1402 
	y[1] = ConvertedY(mc, dd);
1403 
	PMoveUp(-height, mc);
1404 
	gc->lty = LTY_SOLID;
37301 murrell 1405 
	if (gc->lwd > 1)
1406 
	    gc->lwd = 1;
27236 murrell 1407 
	GEPolyline(2, x, y, gc, dd);
1408 
	PMoveAcross(0.5 * width, mc);
1409 
	gc->lty = savedlty;
1410 
	gc->lwd = savedlwd;
2028 ihaka 1411 
    }
1412 
    return MakeBBox(height, depth, 2 * width);
2 r 1413 
#endif
2028 ihaka 1414 
#ifdef SLASH3
1415 
    /* Offset Overprinting - A Failure! */
27236 murrell 1416 
    BBOX slashBBox = RenderSymbolChar(S_SLASH, 0, mc, gc, dd);
2028 ihaka 1417 
    BBOX ansBBox;
1418 
    double height = bboxHeight(slashBBox);
1419 
    double depth = bboxDepth(slashBBox);
1420 
    double width = bboxWidth(slashBBox);
1421 
    double slope = (height + depth) / slope;
27236 murrell 1422 
    double delta = TeX(sigma22, gc, dd);
2028 ihaka 1423 
    if (draw)
27236 murrell 1424 
	PMoveUp(-delta, mc);
1425 
    ansBBox = ShiftBBox(RenderSymbolChar(S_SLASH, draw), -delta, mc, gc, dd);
1426 
    PMoveUp(2 * delta, mc);
32392 ripley 1427 
    ansBBox = CombineBBoxes(ansBBox, RenderGap(2 * delta / slope, draw,
1428 
					       mc, gc, dd));
1429 
    ansBBox = ShiftBBox(RenderSymbolChar(S_SLASH, draw), 2 * delta,
1430 
			mc, gc, dd);
27236 murrell 1431 
    PMoveUp(-delta, mc);
2028 ihaka 1432 
    return ansBBox;
2 r 1433 
#endif
1434 
}
1435 
 
32392 ripley 1436 
static BBOX RenderBin(SEXP expr, int draw, mathContext *mc,
1437 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1438 
{
2028 ihaka 1439 
    int op = BinAtom(CAR(expr));
1440 
    int nexpr = length(expr);
1441 
    BBOX bbox;
1442 
    double gap;
2 r 1443 
 
2028 ihaka 1444 
    if(nexpr == 3) {
1445 
	if (op == S_ASTERISKMATH) {
27236 murrell 1446 
	    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1447 
	    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
32392 ripley 1448 
	    return CombineBBoxes(bbox, RenderElement(CADDR(expr), draw,
1449 
						     mc, gc, dd));
2028 ihaka 1450 
	}
1451 
	else if (op == S_SLASH) {
1452 
	    gap = 0;
27236 murrell 1453 
	    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1454 
	    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
1455 
	    bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
1456 
	    bbox = CombineBBoxes(bbox, RenderSlash(draw, mc, gc, dd));
1457 
	    bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
32392 ripley 1458 
	    return CombineBBoxes(bbox, RenderElement(CADDR(expr), draw,
1459 
						     mc, gc, dd));
2028 ihaka 1460 
	}
1461 
	else {
27236 murrell 1462 
	    gap = (mc->CurrentStyle > STYLE_S) ? MediumSpace(gc, dd) : 0;
1463 
	    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1464 
	    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
1465 
	    bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
1466 
	    bbox = CombineBBoxes(bbox, RenderSymbolChar(op, draw, mc, gc, dd));
1467 
	    bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
32392 ripley 1468 
	    return CombineBBoxes(bbox, RenderElement(CADDR(expr), draw,
1469 
						     mc, gc, dd));
2028 ihaka 1470 
	}
1839 ihaka 1471 
    }
2028 ihaka 1472 
    else if(nexpr == 2) {
27236 murrell 1473 
	gap = (mc->CurrentStyle > STYLE_S) ? ThinSpace(gc, dd) : 0;
1474 
	bbox = RenderSymbolChar(op, draw, mc, gc, dd);
1475 
	bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
32392 ripley 1476 
	return CombineBBoxes(bbox, RenderElement(CADR(expr), draw, mc,
1477 
						 gc, dd));
1839 ihaka 1478 
    }
3865 pd 1479 
    else
32871 ripley 1480 
	error(_("invalid mathematical annotation"));
3865 pd 1481 
 
1482 
    return NullBBox();		/* -Wall */
1483 
 
2 r 1484 
}
1485 
 
1486 
 
2028 ihaka 1487 
/*----------------------------------------------------------------------
1488 
 *
1489 
 *  Code for Subscript and Superscipt Expressions
1490 
 *
1491 
 *  Rules 18, 18a, ..., 18f of the TeXBook.
1492 
 *
1493 
 */
2 r 1494 
 
2028 ihaka 1495 
static int SuperAtom(SEXP expr)
2 r 1496 
{
2028 ihaka 1497 
    return NameAtom(expr) && NameMatch(expr, "^");
2 r 1498 
}
1499 
 
2028 ihaka 1500 
static int SubAtom(SEXP expr)
2 r 1501 
{
2028 ihaka 1502 
    return NameAtom(expr) && NameMatch(expr, "[");
2 r 1503 
}
1504 
 
2028 ihaka 1505 
/* Note : If all computations are correct */
1506 
/* We do not need to save and restore the */
1507 
/* current location here.  This is paranoia. */
32392 ripley 1508 
static BBOX RenderSub(SEXP expr, int draw, mathContext *mc,
1509 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1510 
{
2028 ihaka 1511 
    BBOX bodyBBox, subBBox;
1512 
    SEXP body = CADR(expr);
1513 
    SEXP sub = CADDR(expr);
27236 murrell 1514 
    STYLE style = GetStyle(mc);
1515 
    double savedX = mc->CurrentX;
1516 
    double savedY = mc->CurrentY;
2124 maechler 1517 
    double v, s5, s16;
27236 murrell 1518 
    bodyBBox = RenderElement(body, draw, mc, gc, dd);
1519 
    bodyBBox = RenderItalicCorr(bodyBBox, draw, mc, gc, dd);
1520 
    v = bboxSimple(bodyBBox) ? 0 : bboxDepth(bodyBBox) + TeX(sigma19, gc, dd);
1521 
    s5 = TeX(sigma5, gc, dd);
1522 
    s16 = TeX(sigma16, gc, dd);
1523 
    SetSubStyle(style, mc, gc);
1524 
    subBBox = RenderElement(sub, 0, mc, gc, dd);
2028 ihaka 1525 
    v = max(max(v, s16), bboxHeight(subBBox) - 0.8 * sigma5);
27236 murrell 1526 
    subBBox = RenderOffsetElement(sub, 0, -v, draw, mc, gc, dd);
2028 ihaka 1527 
    bodyBBox = CombineBBoxes(bodyBBox, subBBox);
27236 murrell 1528 
    SetStyle(style, mc, gc);
2028 ihaka 1529 
    if (draw)
27236 murrell 1530 
	PMoveTo(savedX + bboxWidth(bodyBBox), savedY, mc);
2028 ihaka 1531 
    return bodyBBox;
2 r 1532 
}
1533 
 
32392 ripley 1534 
static BBOX RenderSup(SEXP expr, int draw, mathContext *mc,
1535 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1536 
{
2028 ihaka 1537 
    BBOX bodyBBox, subBBox, supBBox;
1538 
    SEXP body = CADR(expr);
1539 
    SEXP sup = CADDR(expr);
3865 pd 1540 
    SEXP sub = R_NilValue;	/* -Wall */
27236 murrell 1541 
    STYLE style = GetStyle(mc);
1542 
    double savedX = mc->CurrentX;
1543 
    double savedY = mc->CurrentY;
2028 ihaka 1544 
    double theta, delta, width;
1545 
    double u, p;
1546 
    double v, s5, s17;
1547 
    int haveSub;
1548 
    if (FormulaExpression(body) && SubAtom(CAR(body))) {
1549 
	sub = CADDR(body);
1550 
	body = CADR(body);
1551 
	haveSub = 1;
1552 
    }
1553 
    else haveSub = 0;
27236 murrell 1554 
    bodyBBox = RenderElement(body, draw, mc, gc, dd);
2028 ihaka 1555 
    delta = bboxItalic(bodyBBox);
27236 murrell 1556 
    bodyBBox = RenderItalicCorr(bodyBBox, draw, mc, gc, dd);
2028 ihaka 1557 
    width = bboxWidth(bodyBBox);
1558 
    if (bboxSimple(bodyBBox)) {
1559 
	u = 0;
1560 
	v = 0;
1561 
    }
1562 
    else {
27236 murrell 1563 
	u = bboxHeight(bodyBBox) - TeX(sigma18, gc, dd);
1564 
	v = bboxDepth(bodyBBox) + TeX(sigma19, gc, dd);
2028 ihaka 1565 
    }
27236 murrell 1566 
    theta = TeX(xi8, gc, dd);
1567 
    s5 = TeX(sigma5, gc, dd);
1568 
    s17 = TeX(sigma17, gc, dd);
2028 ihaka 1569 
    if (style == STYLE_D)
27236 murrell 1570 
	p = TeX(sigma13, gc, dd);
1571 
    else if (IsCompactStyle(style, mc, gc))
1572 
	p = TeX(sigma15, gc, dd);
1839 ihaka 1573 
    else
27236 murrell 1574 
	p = TeX(sigma14, gc, dd);
1575 
    SetSupStyle(style, mc, gc);
1576 
    supBBox = RenderElement(sup, 0, mc, gc, dd);
2028 ihaka 1577 
    u = max(max(u, p), bboxDepth(supBBox) + 0.25 * s5);
2 r 1578 
 
2028 ihaka 1579 
    if (haveSub) {
27236 murrell 1580 
	SetSubStyle(style, mc, gc);
1581 
	subBBox = RenderElement(sub, 0, mc, gc, dd);
2028 ihaka 1582 
	v = max(v, s17);
1583 
	if ((u - bboxDepth(supBBox)) - (bboxHeight(subBBox) - v) < 4 * theta) {
1584 
	    double psi = 0.8 * s5 - (u - bboxDepth(supBBox));
1585 
	    if (psi > 0) {
1586 
		u += psi;
1587 
		v -= psi;
1588 
	    }
1589 
	}
1590 
	if (draw)
27236 murrell 1591 
	    PMoveTo(savedX, savedY, mc);
1592 
	subBBox = RenderOffsetElement(sub, width, -v, draw, mc, gc, dd);
2028 ihaka 1593 
	if (draw)
27236 murrell 1594 
	    PMoveTo(savedX, savedY, mc);
1595 
	SetSupStyle(style, mc, gc);
1596 
	supBBox = RenderOffsetElement(sup, width + delta, u, draw, mc, gc, dd);
2028 ihaka 1597 
	bodyBBox = CombineAlignedBBoxes(bodyBBox, subBBox);
1598 
	bodyBBox = CombineAlignedBBoxes(bodyBBox, supBBox);
1599 
    }
1600 
    else {
27236 murrell 1601 
	supBBox = RenderOffsetElement(sup, 0, u, draw, mc, gc, dd);
2028 ihaka 1602 
	bodyBBox = CombineBBoxes(bodyBBox, supBBox);
1603 
    }
1604 
    if (draw)
27236 murrell 1605 
	PMoveTo(savedX + bboxWidth(bodyBBox), savedY, mc);
1606 
    SetStyle(style, mc, gc);
2028 ihaka 1607 
    return bodyBBox;
2 r 1608 
}
1609 
 
1610 
 
2028 ihaka 1611 
/*----------------------------------------------------------------------
1612 
 *
1613 
 *  Code for Accented Expressions (widehat, bar, widetilde, ...)
1614 
 *
1615 
 */
2 r 1616 
 
2028 ihaka 1617 
#define ACCENT_GAP  0.2
1618 
#define HAT_HEIGHT  0.3
2 r 1619 
 
3475 pd 1620 
#define NTILDE	    8
1621 
#define DELTA	    0.05
2 r 1622 
 
2028 ihaka 1623 
static int WideTildeAtom(SEXP expr)
2 r 1624 
{
2028 ihaka 1625 
    return NameAtom(expr) && NameMatch(expr, "widetilde");
2 r 1626 
}
1627 
 
32392 ripley 1628 
static BBOX RenderWideTilde(SEXP expr, int draw, mathContext *mc,
1629 
			    R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1630 
{
27236 murrell 1631 
    double savedX = mc->CurrentX;
1632 
    double savedY = mc->CurrentY;
1633 
    BBOX bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2028 ihaka 1634 
    double height = bboxHeight(bbox);
2124 maechler 1635 
    /*double width = bboxWidth(bbox);*/
2028 ihaka 1636 
    double totalwidth = bboxWidth(bbox) + bboxItalic(bbox);
1637 
    double delta = totalwidth * (1 - 2 * DELTA) / NTILDE;
1638 
    double start = DELTA * totalwidth;
27236 murrell 1639 
    double accentGap = ACCENT_GAP * XHeight(gc, dd);
1640 
    double hatHeight = 0.5 * HAT_HEIGHT * XHeight(gc, dd);
2028 ihaka 1641 
    double c = 8 * atan(1.0) / NTILDE;
1642 
    double x[NTILDE + 3], y[NTILDE + 3];
1643 
    double baseX, baseY, xval, yval;
1644 
    int i;
2 r 1645 
 
2028 ihaka 1646 
    if (draw) {
27236 murrell 1647 
	int savedlty = gc->lty;
1648 
	double savedlwd = gc->lwd;
2028 ihaka 1649 
	baseX = savedX;
1650 
	baseY = savedY + height + accentGap;
27236 murrell 1651 
	PMoveTo(baseX, baseY, mc);
1652 
	x[0] = ConvertedX(mc, dd);
1653 
	y[0] = ConvertedY(mc, dd);
2028 ihaka 1654 
	for (i = 0; i <= NTILDE; i++) {
1655 
	    xval = start + i * delta;
1656 
	    yval = 0.5 * hatHeight * (sin(c * i) + 1);
27236 murrell 1657 
	    PMoveTo(baseX + xval, baseY + yval, mc);
1658 
	    x[i + 1] = ConvertedX(mc, dd);
1659 
	    y[i + 1] = ConvertedY(mc, dd);
2028 ihaka 1660 
	}
27236 murrell 1661 
	PMoveTo(baseX + totalwidth, baseY + hatHeight, mc);
1662 
	x[NTILDE + 2] = ConvertedX(mc, dd);
1663 
	y[NTILDE + 2] = ConvertedY(mc, dd);
1664 
	gc->lty = LTY_SOLID;
37301 murrell 1665 
	if (gc->lwd > 1)
1666 
	    gc->lwd = 1;
27236 murrell 1667 
	GEPolyline(NTILDE + 3, x, y, gc, dd);
1668 
	PMoveTo(savedX + totalwidth, savedY, mc);
1669 
	gc->lty = savedlty;
1670 
	gc->lwd = savedlwd;
2028 ihaka 1671 
    }
1672 
    return MakeBBox(height + accentGap + hatHeight,
1673 
		    bboxDepth(bbox), totalwidth);
2 r 1674 
}
1675 
 
2028 ihaka 1676 
static int WideHatAtom(SEXP expr)
2 r 1677 
{
2028 ihaka 1678 
    return NameAtom(expr) && NameMatch(expr, "widehat");
2 r 1679 
}
1680 
 
32392 ripley 1681 
static BBOX RenderWideHat(SEXP expr, int draw, mathContext *mc,
1682 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1683 
{
27236 murrell 1684 
    double savedX = mc->CurrentX;
1685 
    double savedY = mc->CurrentY;
1686 
    BBOX bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1687 
    double accentGap = ACCENT_GAP * XHeight(gc, dd);
1688 
    double hatHeight = HAT_HEIGHT * XHeight(gc, dd);
2028 ihaka 1689 
    double totalwidth = bboxWidth(bbox) + bboxItalic(bbox);
1690 
    double height = bboxHeight(bbox);
1691 
    double width = bboxWidth(bbox);
1692 
    double x[3], y[3];
2 r 1693 
 
2028 ihaka 1694 
    if (draw) {
27236 murrell 1695 
	int savedlty = gc->lty;
1696 
	double savedlwd = gc->lwd;
1697 
	PMoveTo(savedX, savedY + height + accentGap, mc);
1698 
	x[0] = ConvertedX(mc, dd);
1699 
	y[0] = ConvertedY(mc, dd);
1700 
	PMoveAcross(0.5 * totalwidth, mc);
1701 
	PMoveUp(hatHeight, mc);
1702 
	x[1] = ConvertedX(mc, dd);
1703 
	y[1] = ConvertedY(mc, dd);
1704 
	PMoveAcross(0.5 * totalwidth, mc);
1705 
	PMoveUp(-hatHeight, mc);
1706 
	x[2] = ConvertedX(mc, dd);
1707 
	y[2] = ConvertedY(mc, dd);
1708 
	gc->lty = LTY_SOLID;
37301 murrell 1709 
	if (gc->lwd > 1)
1710 
	    gc->lwd = 1;
27236 murrell 1711 
	GEPolyline(3, x, y, gc, dd);
1712 
	PMoveTo(savedX + width, savedY, mc);
1713 
	gc->lty = savedlty;
1714 
	gc->lwd = savedlwd;
2028 ihaka 1715 
    }
1716 
    return EnlargeBBox(bbox, accentGap + hatHeight, 0, 0);
2 r 1717 
}
1718 
 
2028 ihaka 1719 
static int BarAtom(SEXP expr)
2 r 1720 
{
2028 ihaka 1721 
    return NameAtom(expr) && NameMatch(expr, "bar");
2 r 1722 
}
1723 
 
32392 ripley 1724 
static BBOX RenderBar(SEXP expr, int draw, mathContext *mc,
1725 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1726 
{
27236 murrell 1727 
    double savedX = mc->CurrentX;
1728 
    double savedY = mc->CurrentY;
1729 
    BBOX bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1730 
    double accentGap = ACCENT_GAP * XHeight(gc, dd);
1731 
    /*double hatHeight = HAT_HEIGHT * XHeight(gc, dd);*/
2028 ihaka 1732 
    double height = bboxHeight(bbox);
1733 
    double width = bboxWidth(bbox);
2105 ihaka 1734 
    double offset = bboxItalic(bbox);
2028 ihaka 1735 
    double x[2], y[2];
2 r 1736 
 
2028 ihaka 1737 
    if (draw) {
27236 murrell 1738 
	int savedlty = gc->lty;
1739 
	double savedlwd = gc->lwd;
1740 
	PMoveTo(savedX + offset, savedY + height + accentGap, mc);
1741 
	x[0] = ConvertedX(mc, dd);
1742 
	y[0] = ConvertedY(mc, dd);
1743 
	PMoveAcross(width, mc);
1744 
	x[1] = ConvertedX(mc, dd);
1745 
	y[1] = ConvertedY(mc, dd);
1746 
	gc->lty = LTY_SOLID;
37301 murrell 1747 
	if (gc->lwd > 1)
1748 
	    gc->lwd = 1;
27236 murrell 1749 
	GEPolyline(2, x, y, gc, dd);
1750 
	PMoveTo(savedX + width, savedY, mc);
1751 
	gc->lty = savedlty;
1752 
	gc->lwd = savedlwd;
2028 ihaka 1753 
    }
1754 
    return EnlargeBBox(bbox, accentGap, 0, 0);
2 r 1755 
}
1756 
 
2028 ihaka 1757 
static struct {
1758 
    char *name;
1759 
    int code;
2 r 1760 
}
2028 ihaka 1761 
AccentTable[] = {
3865 pd 1762 
    { "hat",		 94 },
1763 
    { "ring",		176 },
1764 
    { "tilde",		126 },
19598 ripley 1765 
    { "dot",            215 },
3865 pd 1766 
    { NULL,		  0 },
2028 ihaka 1767 
};
2122 maechler 1768 
 
2028 ihaka 1769 
static int AccentCode(SEXP expr)
2 r 1770 
{
2028 ihaka 1771 
    int i;
1772 
    for (i = 0; AccentTable[i].code; i++)
1773 
	if (NameMatch(expr, AccentTable[i].name))
1774 
	    return AccentTable[i].code;
1775 
    return 0;
2 r 1776 
}
1777 
 
2028 ihaka 1778 
static int AccentAtom(SEXP expr)
2 r 1779 
{
2105 ihaka 1780 
    return NameAtom(expr) && (AccentCode(expr) != 0);
2 r 1781 
}
1782 
 
2028 ihaka 1783 
static void InvalidAccent(SEXP expr)
2 r 1784 
{
32871 ripley 1785 
    errorcall(expr, _("invalid accent"));
2 r 1786 
}
1787 
 
32392 ripley 1788 
static BBOX RenderAccent(SEXP expr, int draw, mathContext *mc,
1789 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1790 
{
2028 ihaka 1791 
    SEXP body, accent;
27236 murrell 1792 
    double savedX = mc->CurrentX;
1793 
    double savedY = mc->CurrentY;
2028 ihaka 1794 
    BBOX bodyBBox, accentBBox;
2105 ihaka 1795 
    double xoffset, yoffset, width, italic;
2028 ihaka 1796 
    int code;
1797 
    if (length(expr) != 2)
1798 
	InvalidAccent(expr);
1799 
    accent = CAR(expr);
1800 
    body = CADR(expr);
2105 ihaka 1801 
    code = AccentCode(accent);
1802 
    if (code == 0)
2028 ihaka 1803 
	InvalidAccent(expr);
27236 murrell 1804 
    bodyBBox = RenderElement(body, 0, mc, gc, dd);
2105 ihaka 1805 
    italic = bboxItalic(bodyBBox);
33681 murrell 1806 
    if (code == 176 || /* ring (as degree) */
1807 
	code == 215)   /* dotmath */
27236 murrell 1808 
	accentBBox = RenderSymbolChar(code, 0, mc, gc, dd);
19598 ripley 1809 
    else
27236 murrell 1810 
	accentBBox = RenderChar(code, 0, mc, gc, dd);
2105 ihaka 1811 
    width = max(bboxWidth(bodyBBox) + bboxItalic(bodyBBox),
1812 
		bboxWidth(accentBBox));
1813 
    xoffset = 0.5 *(width - bboxWidth(bodyBBox));
27236 murrell 1814 
    bodyBBox = RenderGap(xoffset, draw, mc, gc, dd);
1815 
    bodyBBox = CombineBBoxes(bodyBBox, RenderElement(body, draw, mc, gc, dd));
1816 
    bodyBBox = CombineBBoxes(bodyBBox, RenderGap(xoffset, draw, mc, gc, dd));
1817 
    PMoveTo(savedX, savedY, mc);
2105 ihaka 1818 
    xoffset = 0.5 *(width - bboxWidth(accentBBox))
1819 
	+ 0.9 * italic;
32392 ripley 1820 
    yoffset = bboxHeight(bodyBBox) + bboxDepth(accentBBox) +
1821 
	0.1 * XHeight(gc, dd);
2028 ihaka 1822 
    if (draw) {
27236 murrell 1823 
	PMoveTo(savedX + xoffset, savedY + yoffset, mc);
33681 murrell 1824 
	if (code == 176 || /* ring (as degree) */
1825 
	    code == 215) /* dotmath */
27236 murrell 1826 
	    RenderSymbolChar(code, draw, mc, gc, dd);
19598 ripley 1827 
	else
27236 murrell 1828 
	    RenderChar(code, draw, mc, gc, dd);
2028 ihaka 1829 
    }
1830 
    bodyBBox = CombineOffsetBBoxes(bodyBBox, 0, accentBBox, 0,
1831 
				   xoffset, yoffset);
31203 murrell 1832 
    if (draw)
1833 
	PMoveTo(savedX + width, savedY, mc);
2028 ihaka 1834 
    return bodyBBox;
2 r 1835 
}
1836 
 
1837 
 
2028 ihaka 1838 
/*----------------------------------------------------------------------
1839 
 *
1840 
 *  Code for Fraction Expressions  (over, atop)
1841 
 *
1842 
 *  Rules 15, 15a, ..., 15e of the TeXBook
1843 
 *
1844 
 */
2 r 1845 
 
2028 ihaka 1846 
static void NumDenomVShift(BBOX numBBox, BBOX denomBBox,
27236 murrell 1847 
			   double *u, double *v,
1848 
			   mathContext *mc, R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1849 
{
2028 ihaka 1850 
    double a, delta, phi, theta;
27236 murrell 1851 
    a = TeX(sigma22, gc, dd);
1852 
    theta = TeX(xi8, gc, dd);
1853 
    if(mc->CurrentStyle > STYLE_T) {
1854 
	*u = TeX(sigma8, gc, dd);
1855 
	*v = TeX(sigma11, gc, dd);
2028 ihaka 1856 
	phi = 3 * theta;
1857 
    }
1858 
    else {
27236 murrell 1859 
	*u = TeX(sigma9, gc, dd);
1860 
	*v = TeX(sigma12, gc, dd);
2028 ihaka 1861 
	phi = theta;
1862 
    }
1863 
    delta = (*u - bboxDepth(numBBox)) - (a + 0.5 * theta);
37302 murrell 1864 
    /*
1865 
     * Numerators and denominators on fractions appear too far from
1866 
     * horizontal bar.
1867 
     * Reread of Knuth suggests removing "+ theta" components below.
1868 
     */
2028 ihaka 1869 
    if (delta < phi)
37302 murrell 1870 
	*u += (phi - delta); /* + theta; */
2028 ihaka 1871 
    delta = (a + 0.5 * theta) - (bboxHeight(denomBBox) - *v);
1872 
    if (delta < phi)
37302 murrell 1873 
	*v += (phi - delta); /* + theta; */
2 r 1874 
}
1875 
 
2028 ihaka 1876 
static void NumDenomHShift(BBOX numBBox, BBOX denomBBox,
1877 
			   double *numShift, double *denomShift)
2 r 1878 
{
2028 ihaka 1879 
    double numWidth = bboxWidth(numBBox);
1880 
    double denomWidth = bboxWidth(denomBBox);
1881 
    if (numWidth > denomWidth) {
1882 
	*numShift = 0;
1883 
	*denomShift = (numWidth - denomWidth) / 2;
1884 
    }
1885 
    else {
1886 
	*numShift = (denomWidth - numWidth) / 2;
1887 
	*denomShift = 0;
1888 
    }
2 r 1889 
}
1890 
 
32392 ripley 1891 
static BBOX RenderFraction(SEXP expr, int rule, int draw,
1892 
			   mathContext *mc, R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1893 
{
2028 ihaka 1894 
    SEXP numerator = CADR(expr);
1895 
    SEXP denominator = CADDR(expr);
2124 maechler 1896 
    BBOX numBBox, denomBBox;
2028 ihaka 1897 
    double nHShift, dHShift;
1898 
    double nVShift, dVShift;
1899 
    double width, x[2], y[2];
27236 murrell 1900 
    double savedX = mc->CurrentX;
1901 
    double savedY = mc->CurrentY;
2028 ihaka 1902 
    STYLE style;
2 r 1903 
 
27236 murrell 1904 
    style = GetStyle(mc);
1905 
    SetNumStyle(style, mc, gc);
32392 ripley 1906 
    numBBox = RenderItalicCorr(RenderElement(numerator, 0, mc, gc, dd), 0,
1907 
			       mc, gc, dd);
27236 murrell 1908 
    SetDenomStyle(style, mc, gc);
32392 ripley 1909 
    denomBBox = RenderItalicCorr(RenderElement(denominator, 0, mc, gc, dd), 0,
1910 
				 mc, gc, dd);
27236 murrell 1911 
    SetStyle(style, mc, gc);
2 r 1912 
 
2028 ihaka 1913 
    width = max(bboxWidth(numBBox), bboxWidth(denomBBox));
1914 
    NumDenomHShift(numBBox, denomBBox, &nHShift, &dHShift);
27236 murrell 1915 
    NumDenomVShift(numBBox, denomBBox, &nVShift, &dVShift, mc, gc, dd);
2 r 1916 
 
27236 murrell 1917 
    mc->CurrentX = savedX;
1918 
    mc->CurrentY = savedY;
1919 
    SetNumStyle(style, mc, gc);
32392 ripley 1920 
    numBBox = RenderOffsetElement(numerator, nHShift, nVShift, draw, mc,
1921 
				  gc, dd);
2 r 1922 
 
27236 murrell 1923 
    mc->CurrentX = savedX;
1924 
    mc->CurrentY = savedY;
1925 
    SetDenomStyle(style, mc, gc);
32392 ripley 1926 
    denomBBox = RenderOffsetElement(denominator, dHShift, -dVShift, draw,
1927 
				    mc, gc, dd);
2 r 1928 
 
27236 murrell 1929 
    SetStyle(style, mc, gc);
2 r 1930 
 
2028 ihaka 1931 
    if (draw) {
1932 
	if (rule) {
27236 murrell 1933 
	    int savedlty = gc->lty;
1934 
	    double savedlwd = gc->lwd;
1935 
	    mc->CurrentX = savedX;
1936 
	    mc->CurrentY = savedY;
1937 
	    PMoveUp(AxisHeight(gc, dd), mc);
1938 
	    x[0] = ConvertedX(mc, dd);
1939 
	    y[0] = ConvertedY(mc, dd);
1940 
	    PMoveAcross(width, mc);
1941 
	    x[1] = ConvertedX(mc, dd);
1942 
	    y[1] = ConvertedY(mc, dd);
1943 
	    gc->lty = LTY_SOLID;
37301 murrell 1944 
	    if (gc->lwd > 1)
1945 
		gc->lwd = 1;
27236 murrell 1946 
	    GEPolyline(2, x, y, gc, dd);
1947 
	    PMoveUp(-AxisHeight(gc, dd), mc);
1948 
	    gc->lty = savedlty;
1949 
	    gc->lwd = savedlwd;
2028 ihaka 1950 
	}
27236 murrell 1951 
	PMoveTo(savedX + width, savedY, mc);
2028 ihaka 1952 
    }
1953 
    return CombineAlignedBBoxes(numBBox, denomBBox);
2 r 1954 
}
1955 
 
31430 ripley 1956 
static BBOX RenderUnderline(SEXP expr, int draw, mathContext *mc,
1957 
	        	    R_GE_gcontext *gc, GEDevDesc *dd)
1958 
{
1959 
    SEXP body = CADR(expr);
1960 
    BBOX BBox;
1961 
    double width, adepth, depth, x[2], y[2];
1962 
    double savedX = mc->CurrentX;
1963 
    double savedY = mc->CurrentY;
1964 
 
1965 
    BBox = RenderItalicCorr(RenderElement(body, 0, mc, gc, dd), 0, mc, gc, dd);
1966 
    width = bboxWidth(BBox);
1967 
 
1968 
    mc->CurrentX = savedX;
1969 
    mc->CurrentY = savedY;
1970 
    BBox = RenderElement(body, draw, mc, gc, dd);
1971 
    adepth = 0.1 * XHeight(gc, dd);
1972 
    depth = bboxDepth(BBox) + adepth;
1973 
 
1974 
    if (draw) {
1975 
        int savedlty = gc->lty;
1976 
        double savedlwd = gc->lwd;
1977 
        mc->CurrentX = savedX;
1978 
        mc->CurrentY = savedY;
1979 
        PMoveUp(-depth, mc);
1980 
        x[0] = ConvertedX(mc, dd);
1981 
        y[0] = ConvertedY(mc, dd);
1982 
        PMoveAcross(width, mc);
1983 
        x[1] = ConvertedX(mc, dd);
1984 
        y[1] = ConvertedY(mc, dd);
1985 
        gc->lty = LTY_SOLID;
37301 murrell 1986 
	if (gc->lwd > 1)
1987 
	    gc->lwd = 1;
31430 ripley 1988 
        GEPolyline(2, x, y, gc, dd);
1989 
        PMoveUp(depth, mc);
1990 
        gc->lty = savedlty;
1991 
        gc->lwd = savedlwd;
1992 
        PMoveTo(savedX + width, savedY, mc);
1993 
    }
1994 
    return EnlargeBBox(BBox, 0.0, adepth, 0.0);
1995 
}
1996 
 
1997 
 
2028 ihaka 1998 
static int OverAtom(SEXP expr)
2 r 1999 
{
2105 ihaka 2000 
    return NameAtom(expr) &&
3475 pd 2001 
	(NameMatch(expr, "over") || NameMatch(expr, "frac"));
2 r 2002 
}
2003 
 
32392 ripley 2004 
static BBOX RenderOver(SEXP expr, int draw, mathContext *mc,
2005 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2006 
{
27236 murrell 2007 
    return RenderFraction(expr, 1, draw, mc, gc, dd);
2 r 2008 
}
2009 
 
31430 ripley 2010 
static int UnderlAtom(SEXP expr)
2011 
{
2012 
    return NameAtom(expr) && NameMatch(expr, "underline");
2013 
}
2014 
 
32392 ripley 2015 
static BBOX RenderUnderl(SEXP expr, int draw, mathContext *mc,
2016 
			 R_GE_gcontext *gc, GEDevDesc *dd)
31430 ripley 2017 
{
2018 
    return RenderUnderline(expr, draw, mc, gc, dd);
2019 
}
2020 
 
2021 
 
2028 ihaka 2022 
static int AtopAtom(SEXP expr)
2 r 2023 
{
2028 ihaka 2024 
    return NameAtom(expr) && NameMatch(expr, "atop");
2 r 2025 
}
2026 
 
32392 ripley 2027 
static BBOX RenderAtop(SEXP expr, int draw, mathContext *mc,
2028 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2029 
{
27236 murrell 2030 
    return RenderFraction(expr, 0, draw, mc, gc, dd);
2 r 2031 
}
2105 ihaka 2032 
 
2028 ihaka 2033 
/*----------------------------------------------------------------------
2034 
 *
2035 
 *  Code for Grouped Expressions  (e.g. ( ... ))
2036 
 *
2037 
 *    group(ldelim, body, rdelim)
2038 
 *
2039 
 *    bgroup(ldelim, body, rdelim)
2040 
 *
2041 
 */
2 r 2042 
 
2105 ihaka 2043 
#define DelimSymbolMag 1.25
2044 
 
2028 ihaka 2045 
static int DelimCode(SEXP expr, SEXP head)
2 r 2046 
{
2028 ihaka 2047 
    int code = 0;
2048 
    if (NameAtom(head)) {
2049 
	if (NameMatch(head, "lfloor"))
2050 
	    code = S_BRACKETLEFTBT;
2051 
	else if (NameMatch(head, "rfloor"))
2052 
	    code = S_BRACKETRIGHTBT;
2053 
	if (NameMatch(head, "lceil"))
8061 murrell 2054 
	    code = S_BRACKETLEFTTP;
2028 ihaka 2055 
	else if (NameMatch(head, "rceil"))
8061 murrell 2056 
	    code = S_BRACKETRIGHTTP;
2028 ihaka 2057 
    }
2058 
    else if (StringAtom(head) && length(head) > 0) {
2059 
	if (StringMatch(head, "|"))
2060 
	    code = '|';
2061 
	else if (StringMatch(head, "||"))
2062 
	    code = 2;
2063 
	else if (StringMatch(head, "("))
2064 
	    code = '(';
2065 
	else if (StringMatch(head, ")"))
2066 
	    code = ')';
2067 
	else if (StringMatch(head, "["))
2068 
	    code = '[';
2069 
	else if (StringMatch(head, "]"))
2070 
	    code = ']';
2071 
	else if (StringMatch(head, "{"))
2072 
	    code = '{';
2073 
	else if (StringMatch(head, "}"))
2074 
	    code = '}';
2075 
	else if (StringMatch(head, "") || StringMatch(head, "."))
2076 
	    code = '.';
2077 
    }
2078 
    if (code == 0)
32871 ripley 2079 
	errorcall(expr, _("invalid group delimiter"));
2028 ihaka 2080 
    return code;
1016 maechler 2081 
}
2 r 2082 
 
32392 ripley 2083 
static BBOX RenderDelimiter(int delim, int draw, mathContext *mc,
2084 
			    R_GE_gcontext *gc, GEDevDesc *dd)
2105 ihaka 2085 
{
2086 
    BBOX bbox;
27236 murrell 2087 
    double savecex = gc->cex;
2088 
    gc->cex = DelimSymbolMag * gc->cex;
2089 
    bbox = RenderSymbolChar(delim, draw, mc, gc, dd);
2090 
    gc->cex = savecex;
2105 ihaka 2091 
    return bbox;
2092 
}
2093 
 
2028 ihaka 2094 
static int GroupAtom(SEXP expr)
2 r 2095 
{
2028 ihaka 2096 
    return NameAtom(expr) && NameMatch(expr, "group");
2 r 2097 
}
2098 
 
32392 ripley 2099 
static BBOX RenderGroup(SEXP expr, int draw, mathContext *mc,
2100 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2101 
{
27236 murrell 2102 
    double cexSaved = gc->cex;
2028 ihaka 2103 
    BBOX bbox;
2104 
    int code;
2105 
    if (length(expr) != 4)
32871 ripley 2106 
	errorcall(expr, _("invalid group specification"));
2028 ihaka 2107 
    bbox = NullBBox();
2108 
    code = DelimCode(expr, CADR(expr));
27236 murrell 2109 
    gc->cex = DelimSymbolMag * gc->cex;
2028 ihaka 2110 
    if (code == 2) {
27236 murrell 2111 
	bbox = RenderSymbolChar('|', draw, mc, gc, dd);
2112 
	bbox = RenderSymbolChar('|', draw, mc, gc, dd);
2028 ihaka 2113 
    }
2114 
    else if (code != '.')
27236 murrell 2115 
	bbox = RenderSymbolChar(code, draw, mc, gc, dd);
2116 
    gc->cex = cexSaved;
2117 
    bbox = CombineBBoxes(bbox, RenderElement(CADDR(expr), draw, mc, gc, dd));
2118 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2028 ihaka 2119 
    code = DelimCode(expr, CADDDR(expr));
27236 murrell 2120 
    gc->cex = DelimSymbolMag * gc->cex;
2028 ihaka 2121 
    if (code == 2) {
27236 murrell 2122 
	bbox = CombineBBoxes(bbox, RenderSymbolChar('|', draw, mc, gc, dd));
2123 
	bbox = CombineBBoxes(bbox, RenderSymbolChar('|', draw, mc, gc, dd));
2028 ihaka 2124 
    }
2125 
    else if (code != '.')
27236 murrell 2126 
	bbox = CombineBBoxes(bbox, RenderSymbolChar(code, draw, mc, gc, dd));
2127 
    gc->cex = cexSaved;
2028 ihaka 2128 
    return bbox;
2 r 2129 
}
2130 
 
2028 ihaka 2131 
static int BGroupAtom(SEXP expr)
2 r 2132 
{
2028 ihaka 2133 
    return NameAtom(expr) && NameMatch(expr, "bgroup");
2 r 2134 
}
2135 
 
32392 ripley 2136 
static BBOX RenderDelim(int which, double dist, int draw, mathContext *mc,
2137 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2138 
{
27236 murrell 2139 
    double savedX = mc->CurrentX;
2140 
    double savedY = mc->CurrentY;
2141 
    FontType prev = SetFont(SymbolFont, gc);
2028 ihaka 2142 
    BBOX ansBBox, topBBox, botBBox, extBBox, midBBox;
2143 
    int top, bot, ext, mid;
2105 ihaka 2144 
    int i, n;
2145 
    double topShift, botShift, extShift, midShift;
2146 
    double ytop, ybot, extHeight, delta;
27236 murrell 2147 
    double axisHeight = TeX(sigma22, gc, dd);
2 r 2148 
 
2028 ihaka 2149 
    switch(which) {
32392 ripley 2150 
    case '.':
27236 murrell 2151 
	SetFont(prev, gc);
2028 ihaka 2152 
	return NullBBox();
2153 
	break;
2154 
    case '|':
2155 
    case 2:
2156 
	top = 239; ext = 239; bot = 239; mid = 0;
2157 
	break;
2158 
    case '(':
2159 
	top = 230; ext = 231; bot = 232; mid = 0;
2160 
	break;
2161 
    case ')':
2162 
	top = 246; ext = 247; bot = 248; mid = 0;
2163 
	break;
2164 
    case '[':
2165 
	top = 233; ext = 234; bot = 235; mid = 0;
2166 
	break;
2167 
    case ']':
2168 
	top = 249; ext = 250; bot = 251; mid = 0;
2169 
	break;
2170 
    case '{':
2171 
	top = 236; ext = 239; bot = 238; mid = 237;
2122 maechler 2172 
	break;
2028 ihaka 2173 
    case '}':
2174 
	top = 252; ext = 239; bot = 254; mid = 253;
2175 
	break;
2176 
    default:
32871 ripley 2177 
	error(_("group is incomplete"));
33417 ripley 2178 
	return NullBBox();/*never reached*/
2028 ihaka 2179 
    }
27236 murrell 2180 
    topBBox = GlyphBBox(top, gc, dd);
2181 
    extBBox = GlyphBBox(ext, gc, dd);
2182 
    botBBox = GlyphBBox(bot, gc, dd);
2105 ihaka 2183 
    if (which == '{' || which == '}') {
2184 
	if (1.2 * (bboxHeight(topBBox) + bboxDepth(topBBox)) > dist)
2185 
	    dist = 1.2 * (bboxHeight(topBBox) + bboxDepth(botBBox));
2186 
    }
2187 
    else {
2188 
	if (0.8 * (bboxHeight(topBBox) + bboxDepth(topBBox)) > dist)
2189 
	    dist = 0.8 * (bboxHeight(topBBox) + bboxDepth(topBBox));
2190 
    }
2191 
    extHeight = bboxHeight(extBBox) + bboxDepth(extBBox);
2028 ihaka 2192 
    topShift = dist - bboxHeight(topBBox) + axisHeight;
2193 
    botShift = dist - bboxDepth(botBBox) - axisHeight;
2105 ihaka 2194 
    extShift = 0.5 * (bboxHeight(extBBox) - bboxDepth(extBBox));
2028 ihaka 2195 
    topBBox = ShiftBBox(topBBox, topShift);
2196 
    botBBox = ShiftBBox(botBBox, -botShift);
2197 
    ansBBox = CombineAlignedBBoxes(topBBox, botBBox);
2105 ihaka 2198 
    if (which == '{' || which == '}') {
27236 murrell 2199 
	midBBox = GlyphBBox(mid, gc, dd);
2105 ihaka 2200 
	midShift = axisHeight
2201 
	    - 0.5 * (bboxHeight(midBBox) - bboxDepth(midBBox));
2202 
	midBBox = ShiftBBox(midBBox, midShift);
2203 
	ansBBox = CombineAlignedBBoxes(ansBBox, midBBox);
2204 
	if (draw) {
27236 murrell 2205 
	    PMoveTo(savedX, savedY + topShift, mc);
2206 
	    RenderSymbolChar(top, draw, mc, gc, dd);
2207 
	    PMoveTo(savedX, savedY + midShift, mc);
2208 
	    RenderSymbolChar(mid, draw, mc, gc, dd);
2209 
	    PMoveTo(savedX, savedY - botShift, mc);
2210 
	    RenderSymbolChar(bot, draw, mc, gc, dd);
2211 
	    PMoveTo(savedX + bboxWidth(ansBBox), savedY, mc);
2105 ihaka 2212 
	}
2028 ihaka 2213 
    }
2105 ihaka 2214 
    else {
2215 
	if (draw) {
2216 
	    /* draw the top and bottom elements */
27236 murrell 2217 
	    PMoveTo(savedX, savedY + topShift, mc);
2218 
	    RenderSymbolChar(top, draw, mc, gc, dd);
2219 
	    PMoveTo(savedX, savedY - botShift, mc);
2220 
	    RenderSymbolChar(bot, draw, mc, gc, dd);
2105 ihaka 2221 
	    /* now join with extenders */
2222 
	    ytop = axisHeight + dist
2223 
		- (bboxHeight(topBBox) + bboxDepth(topBBox));
2224 
	    ybot = axisHeight - dist
2225 
		+ (bboxHeight(botBBox) + bboxDepth(botBBox));
2226 
	    n = ceil((ytop - ybot) / (0.99 * extHeight));
2227 
	    if (n > 0) {
2228 
		delta = (ytop - ybot) / n;
2229 
		for (i = 0; i < n; i++) {
32392 ripley 2230 
		    PMoveTo(savedX, savedY + ybot +
2231 
			    (i + 0.5) * delta - extShift, mc);
27236 murrell 2232 
		    RenderSymbolChar(ext, draw, mc, gc, dd);
2105 ihaka 2233 
		}
2234 
	    }
27236 murrell 2235 
	    PMoveTo(savedX + bboxWidth(ansBBox), savedY, mc);
2122 maechler 2236 
 
2105 ihaka 2237 
	}
2238 
    }
27236 murrell 2239 
    SetFont(prev, gc);
2028 ihaka 2240 
    return ansBBox;
2 r 2241 
}
2242 
 
32392 ripley 2243 
static BBOX RenderBGroup(SEXP expr, int draw, mathContext *mc,
2244 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2245 
{
2028 ihaka 2246 
    double dist;
2124 maechler 2247 
    BBOX bbox;
27236 murrell 2248 
    double axisHeight = TeX(sigma22, gc, dd);
2249 
    double extra = 0.2 * xHeight(gc, dd);
2028 ihaka 2250 
    int delim1, delim2;
2251 
    if (length(expr) != 4)
32871 ripley 2252 
	errorcall(expr, _("invalid group specification"));
2028 ihaka 2253 
    bbox = NullBBox();
2254 
    delim1 = DelimCode(expr, CADR(expr));
2255 
    delim2 = DelimCode(expr, CADDDR(expr));
27236 murrell 2256 
    bbox = RenderElement(CADDR(expr), 0, mc, gc, dd);
2028 ihaka 2257 
    dist = max(bboxHeight(bbox) - axisHeight, bboxDepth(bbox) + axisHeight);
27236 murrell 2258 
    bbox = RenderDelim(delim1, dist + extra, draw, mc, gc, dd);
2259 
    bbox = CombineBBoxes(bbox,	RenderElement(CADDR(expr), draw, mc, gc, dd));
2260 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
32392 ripley 2261 
    bbox = CombineBBoxes(bbox,	RenderDelim(delim2, dist + extra, draw, mc,
2262 
					    gc, dd));
2028 ihaka 2263 
    return bbox;
2 r 2264 
}
2265 
 
2028 ihaka 2266 
/*----------------------------------------------------------------------
2267 
 *
2268 
 *  Code for Parenthetic Expressions  (i.e. ( ... ))
2269 
 *
2270 
 */
2 r 2271 
 
2028 ihaka 2272 
static int ParenAtom(SEXP expr)
2 r 2273 
{
2028 ihaka 2274 
    return NameAtom(expr) && NameMatch(expr, "(");
2 r 2275 
}
2276 
 
32392 ripley 2277 
static BBOX RenderParen(SEXP expr, int draw, mathContext *mc,
2278 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2279 
{
2028 ihaka 2280 
    BBOX bbox;
27236 murrell 2281 
    bbox = RenderDelimiter(S_PARENLEFT, draw, mc, gc, dd);
2282 
    bbox = CombineBBoxes(bbox, RenderElement(CADR(expr), draw, mc, gc, dd));
2283 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2284 
    return CombineBBoxes(bbox, RenderDelimiter(S_PARENRIGHT, draw, mc, gc, dd));
2 r 2285 
}
2286 
 
2028 ihaka 2287 
/*----------------------------------------------------------------------
2288 
 *
2289 
 *  Code for Integral Operators.
2290 
 *
2291 
 */
2 r 2292 
 
2028 ihaka 2293 
static int IntAtom(SEXP expr)
2 r 2294 
{
2028 ihaka 2295 
    return NameAtom(expr) && NameMatch(expr, "integral");
2 r 2296 
}
2297 
 
1926 ihaka 2298 
 
32392 ripley 2299 
static BBOX RenderIntSymbol(int draw, mathContext *mc, R_GE_gcontext *gc,
2300 
			    GEDevDesc *dd)
1926 ihaka 2301 
{
27236 murrell 2302 
    double savedX = mc->CurrentX;
2303 
    double savedY = mc->CurrentY;
2304 
    if (GetStyle(mc) > STYLE_T) {
2305 
	BBOX bbox1 = RenderSymbolChar(243, 0, mc, gc, dd);
2306 
	BBOX bbox2 = RenderSymbolChar(245, 0, mc, gc, dd);
2105 ihaka 2307 
	double shift;
27236 murrell 2308 
	shift = TeX(sigma22, gc, dd) + 0.99 * bboxDepth(bbox1);
2309 
	PMoveUp(shift, mc);
2310 
	bbox1 = ShiftBBox(RenderSymbolChar(243, draw, mc, gc, dd), shift);
2311 
	mc->CurrentX = savedX;
2312 
	mc->CurrentY = savedY;
2313 
	shift = TeX(sigma22, gc, dd) - 0.99 * bboxHeight(bbox2);
2314 
	PMoveUp(shift, mc);
2315 
	bbox2 = ShiftBBox(RenderSymbolChar(245, draw, mc, gc, dd), shift);
2105 ihaka 2316 
	if (draw)
32392 ripley 2317 
	    PMoveTo(savedX + max(bboxWidth(bbox1), bboxWidth(bbox2)),
2318 
		    savedY, mc);
2105 ihaka 2319 
	else
27236 murrell 2320 
	    PMoveTo(savedX, savedY, mc);
2105 ihaka 2321 
	return CombineAlignedBBoxes(bbox1, bbox2);
2322 
    }
2323 
    else {
27236 murrell 2324 
	return RenderSymbolChar(0362, draw, mc, gc, dd);
2105 ihaka 2325 
    }
1926 ihaka 2326 
}
2327 
 
32392 ripley 2328 
static BBOX RenderInt(SEXP expr, int draw, mathContext *mc,
2329 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2330 
{
2028 ihaka 2331 
    BBOX opBBox, lowerBBox, upperBBox, bodyBBox;
2332 
    int nexpr = length(expr);
27236 murrell 2333 
    STYLE style = GetStyle(mc);
2334 
    double savedX = mc->CurrentX;
2335 
    double savedY = mc->CurrentY;
2028 ihaka 2336 
    double hshift, vshift, width;
2 r 2337 
 
27236 murrell 2338 
    opBBox = RenderIntSymbol(draw, mc, gc, dd);
2028 ihaka 2339 
    width = bboxWidth(opBBox);
27236 murrell 2340 
    mc->CurrentX = savedX;
2341 
    mc->CurrentY = savedY;
2028 ihaka 2342 
    if (nexpr > 2) {
27236 murrell 2343 
	hshift = 0.5 * width + ThinSpace(gc, dd);
2344 
	SetSubStyle(style, mc, gc);
2345 
	lowerBBox = RenderElement(CADDR(expr), 0, mc, gc, dd);
2028 ihaka 2346 
	vshift = bboxDepth(opBBox) + CenterShift(lowerBBox);
32392 ripley 2347 
	lowerBBox = RenderOffsetElement(CADDR(expr), hshift, -vshift, draw,
2348 
					mc, gc, dd);
2028 ihaka 2349 
	opBBox = CombineAlignedBBoxes(opBBox, lowerBBox);
27236 murrell 2350 
	SetStyle(style, mc, gc);
2351 
	mc->CurrentX = savedX;
2352 
	mc->CurrentY = savedY;
1839 ihaka 2353 
    }
2028 ihaka 2354 
    if (nexpr > 3) {
27236 murrell 2355 
	hshift = width + ThinSpace(gc, dd);
2356 
	SetSupStyle(style, mc, gc);
2357 
	upperBBox = RenderElement(CADDDR(expr), 0, mc, gc, dd);
2028 ihaka 2358 
	vshift = bboxHeight(opBBox) - CenterShift(upperBBox);
32392 ripley 2359 
	upperBBox = RenderOffsetElement(CADDDR(expr), hshift, vshift, draw,
2360 
					mc, gc, dd);
2028 ihaka 2361 
	opBBox = CombineAlignedBBoxes(opBBox, upperBBox);
27236 murrell 2362 
	SetStyle(style, mc, gc);
2363 
	mc->CurrentX = savedX;
2364 
	mc->CurrentY = savedY;
1839 ihaka 2365 
    }
27236 murrell 2366 
    PMoveAcross(bboxWidth(opBBox), mc);
2028 ihaka 2367 
    if (nexpr > 1) {
27236 murrell 2368 
	bodyBBox = RenderElement(CADR(expr), draw, mc, gc, dd);
2028 ihaka 2369 
	opBBox = CombineBBoxes(opBBox, bodyBBox);
1839 ihaka 2370 
    }
2028 ihaka 2371 
    return opBBox;
2 r 2372 
}
2373 
 
2374 
 
2028 ihaka 2375 
/*----------------------------------------------------------------------
2376 
 *
2377 
 *  Code for Operator Expressions (sum, product, lim, inf, sup, ...)
2378 
 *
2379 
 */
2 r 2380 
 
2028 ihaka 2381 
#define OperatorSymbolMag  1.25
2 r 2382 
 
2028 ihaka 2383 
static SymTab OpTable[] = {
3865 pd 2384 
    { "prod",		S_PRODUCT },
2385 
    { "sum",		S_SUM },
2386 
    { "union",		S_UNION },
2387 
    { "intersect",	S_INTERSECTION },
2388 
    { "lim",		N_LIM },
2389 
    { "liminf",		N_LIMINF },
2390 
    { "limsup",		N_LIMINF },
2391 
    { "inf",		N_INF },
2392 
    { "sup",		N_SUP },
2393 
    { "min",		N_MIN },
2394 
    { "max",		N_MAX },
2395 
    { NULL,		0 }
2028 ihaka 2396 
};
2 r 2397 
 
2028 ihaka 2398 
static int OpAtom(SEXP expr)
2 r 2399 
{
2028 ihaka 2400 
    int i;
2401 
    for (i = 0; OpTable[i].code; i++)
2402 
	if (NameMatch(expr, OpTable[i].name))
2403 
	    return OpTable[i].code;
2404 
    return 0;
2 r 2405 
}
2406 
 
32392 ripley 2407 
static BBOX RenderOpSymbol(SEXP op, int draw, mathContext *mc,
2408 
			   R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2409 
{
2028 ihaka 2410 
    BBOX bbox;
27236 murrell 2411 
    double cexSaved = gc->cex;
2412 
    /*double savedX = mc->CurrentX;*/
2413 
    /*double savedY = mc->CurrentY;*/
2028 ihaka 2414 
    double shift;
27236 murrell 2415 
    int display = (GetStyle(mc) > STYLE_T);
2028 ihaka 2416 
    int opId = OpAtom(op);
2 r 2417 
 
8061 murrell 2418 
    if (opId == S_SUM || opId == S_PRODUCT ||
2419 
	opId == S_UNION || opId == S_INTERSECTION) {
2105 ihaka 2420 
	if (display) {
27236 murrell 2421 
	    gc->cex = OperatorSymbolMag * gc->cex;
2422 
	    bbox = RenderSymbolChar(OpAtom(op), 0, mc, gc, dd);
32392 ripley 2423 
	    shift = 0.5 * (bboxHeight(bbox) - bboxDepth(bbox)) -
2424 
		TeX(sigma22, gc, dd);
2105 ihaka 2425 
	    if (draw) {
27236 murrell 2426 
		PMoveUp(-shift, mc);
2427 
		bbox = RenderSymbolChar(opId, 1, mc, gc, dd);
2428 
		PMoveUp(shift, mc);
2105 ihaka 2429 
	    }
27236 murrell 2430 
	    gc->cex = cexSaved;
2105 ihaka 2431 
	    return ShiftBBox(bbox, -shift);
2028 ihaka 2432 
	}
27236 murrell 2433 
	else return RenderSymbolChar(opId, draw, mc, gc, dd);
2028 ihaka 2434 
    }
1839 ihaka 2435 
    else {
27236 murrell 2436 
	FontType prevfont = SetFont(PlainFont, gc);
2437 
	bbox = RenderStr(CHAR(PRINTNAME(op)), draw, mc, gc, dd);
2438 
	SetFont(prevfont, gc);
2028 ihaka 2439 
	return bbox;
1839 ihaka 2440 
    }
2 r 2441 
}
2442 
 
32392 ripley 2443 
static BBOX RenderOp(SEXP expr, int draw, mathContext *mc,
2444 
		     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2445 
{
2028 ihaka 2446 
    BBOX lowerBBox, upperBBox, bodyBBox;
27236 murrell 2447 
    double savedX = mc->CurrentX;
2448 
    double savedY = mc->CurrentY;
2028 ihaka 2449 
    int nexpr = length(expr);
27236 murrell 2450 
    STYLE style = GetStyle(mc);
2451 
    BBOX opBBox = RenderOpSymbol(CAR(expr), 0, mc, gc, dd);
2028 ihaka 2452 
    double width = bboxWidth(opBBox);
2453 
    double hshift, lvshift, uvshift;
3865 pd 2454 
    lvshift = uvshift = 0;	/* -Wall */
2028 ihaka 2455 
    if (nexpr > 2) {
27236 murrell 2456 
	SetSubStyle(style, mc, gc);
2457 
	lowerBBox = RenderElement(CADDR(expr), 0, mc, gc, dd);
2458 
	SetStyle(style, mc, gc);
2028 ihaka 2459 
	width = max(width, bboxWidth(lowerBBox));
32392 ripley 2460 
	lvshift = max(TeX(xi10, gc, dd), TeX(xi12, gc, dd) -
2461 
		      bboxHeight(lowerBBox));
2028 ihaka 2462 
	lvshift = bboxDepth(opBBox) + bboxHeight(lowerBBox) + lvshift;
2463 
    }
2464 
    if (nexpr > 3) {
27236 murrell 2465 
	SetSupStyle(style, mc, gc);
2466 
	upperBBox = RenderElement(CADDDR(expr), 0, mc, gc, dd);
2467 
	SetStyle(style, mc, gc);
2028 ihaka 2468 
	width = max(width, bboxWidth(upperBBox));
32392 ripley 2469 
	uvshift = max(TeX(xi9, gc, dd), TeX(xi11, gc, dd) -
2470 
		      bboxDepth(upperBBox));
2028 ihaka 2471 
	uvshift = bboxHeight(opBBox) + bboxDepth(upperBBox) + uvshift;
2472 
    }
2473 
    hshift = 0.5 * (width - bboxWidth(opBBox));
27236 murrell 2474 
    opBBox = RenderGap(hshift, draw, mc, gc, dd);
32392 ripley 2475 
    opBBox = CombineBBoxes(opBBox,
2476 
			   RenderOpSymbol(CAR(expr), draw, mc, gc, dd));
27236 murrell 2477 
    mc->CurrentX = savedX;
2478 
    mc->CurrentY = savedY;
2028 ihaka 2479 
    if (nexpr > 2) {
27236 murrell 2480 
	SetSubStyle(style, mc, gc);
2028 ihaka 2481 
	hshift = 0.5 * (width - bboxWidth(lowerBBox));
32392 ripley 2482 
	lowerBBox = RenderOffsetElement(CADDR(expr), hshift, -lvshift, draw,
2483 
					mc, gc, dd);
27236 murrell 2484 
	SetStyle(style, mc, gc);
2028 ihaka 2485 
	opBBox = CombineAlignedBBoxes(opBBox, lowerBBox);
27236 murrell 2486 
	mc->CurrentX = savedX;
2487 
	mc->CurrentY = savedY;
2028 ihaka 2488 
    }
2489 
    if (nexpr > 3) {
27236 murrell 2490 
	SetSupStyle(style, mc, gc);
2028 ihaka 2491 
	hshift = 0.5 * (width - bboxWidth(upperBBox));
32392 ripley 2492 
	upperBBox = RenderOffsetElement(CADDDR(expr), hshift, uvshift, draw,
2493 
					mc, gc, dd);
27236 murrell 2494 
	SetStyle(style, mc, gc);
2028 ihaka 2495 
	opBBox = CombineAlignedBBoxes(opBBox, upperBBox);
27236 murrell 2496 
	mc->CurrentX = savedX;
2497 
	mc->CurrentY = savedY;
2028 ihaka 2498 
    }
27236 murrell 2499 
    opBBox = EnlargeBBox(opBBox, TeX(xi13, gc, dd), TeX(xi13, gc, dd), 0);
2028 ihaka 2500 
    if (draw)
27236 murrell 2501 
	PMoveAcross(width, mc);
32392 ripley 2502 
    opBBox = CombineBBoxes(opBBox,
2503 
			   RenderGap(ThinSpace(gc, dd), draw, mc, gc, dd));
27236 murrell 2504 
    bodyBBox = RenderElement(CADR(expr), draw, mc, gc, dd);
2028 ihaka 2505 
    return CombineBBoxes(opBBox, bodyBBox);
2 r 2506 
}
2507 
 
2508 
 
2028 ihaka 2509 
/*----------------------------------------------------------------------
2510 
 *
2511 
 *  Code for radical expressions (root, sqrt)
2512 
 *
2513 
 *  Tunable parameteters :
2514 
 *
3475 pd 2515 
 *  RADICAL_GAP	   The gap between the nucleus and the radical extension.
2028 ihaka 2516 
 *  RADICAL_SPACE  Extra space to the left and right of the nucleus.
2517 
 *
2518 
 */
2 r 2519 
 
2028 ihaka 2520 
#define RADICAL_GAP    0.4
2521 
#define RADICAL_SPACE  0.2
2 r 2522 
 
2028 ihaka 2523 
static int RadicalAtom(SEXP expr)
2 r 2524 
{
2028 ihaka 2525 
    return NameAtom(expr) &&
2526 
	(NameMatch(expr, "root") ||
2527 
	 NameMatch(expr, "sqrt"));
2 r 2528 
}
2529 
 
32392 ripley 2530 
static BBOX RenderScript(SEXP expr, int draw, mathContext *mc,
2531 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2532 
{
2028 ihaka 2533 
    BBOX bbox;
27236 murrell 2534 
    STYLE style = GetStyle(mc);
2535 
    SetSupStyle(style, mc, gc);
2536 
    bbox = RenderElement(expr, draw, mc, gc, dd);
2537 
    SetStyle(style, mc, gc);
2028 ihaka 2538 
    return bbox;
2 r 2539 
}
2540 
 
32392 ripley 2541 
static BBOX RenderRadical(SEXP expr, int draw, mathContext *mc,
2542 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2543 
{
1839 ihaka 2544 
    SEXP body = CADR(expr);
2028 ihaka 2545 
    SEXP order = CADDR(expr);
2124 maechler 2546 
    BBOX bodyBBox, orderBBox;
2028 ihaka 2547 
    double radWidth, radHeight, radDepth;
2548 
    double leadWidth, leadHeight, twiddleHeight;
2549 
    double hshift, vshift;
2550 
    double radGap, radSpace, radTrail;
27236 murrell 2551 
    STYLE style = GetStyle(mc);
2552 
    double savedX = mc->CurrentX;
2553 
    double savedY = mc->CurrentY;
2028 ihaka 2554 
    double x[5], y[5];
2 r 2555 
 
27236 murrell 2556 
    radGap = RADICAL_GAP * xHeight(gc, dd);
2557 
    radSpace = RADICAL_SPACE * xHeight(gc, dd);
2558 
    radTrail = MuSpace(gc, dd);
2559 
    SetPrimeStyle(style, mc, gc);
2560 
    bodyBBox = RenderElement(body, 0, mc, gc, dd);
2561 
    bodyBBox = RenderItalicCorr(bodyBBox, 0, mc, gc, dd);
2 r 2562 
 
27236 murrell 2563 
    radWidth = 0.6 *XHeight(gc, dd);
2028 ihaka 2564 
    radHeight = bboxHeight(bodyBBox) + radGap;
2565 
    radDepth = bboxDepth(bodyBBox);
2566 
    twiddleHeight = CenterShift(bodyBBox);
2 r 2567 
 
2028 ihaka 2568 
    leadWidth = radWidth;
2569 
    leadHeight = radHeight;
2570 
    if (order != R_NilValue) {
27236 murrell 2571 
	SetSupStyle(style, mc, gc);
2572 
	orderBBox = RenderScript(order, 0, mc, gc, dd);
2028 ihaka 2573 
	leadWidth = max(leadWidth, bboxWidth(orderBBox) + 0.4 * radWidth);
2574 
	hshift = leadWidth - bboxWidth(orderBBox) - 0.4 * radWidth;
2575 
	vshift = leadHeight - bboxHeight(orderBBox);
2576 
	if (vshift - bboxDepth(orderBBox) < twiddleHeight + radGap)
2577 
	    vshift = twiddleHeight + bboxDepth(orderBBox) + radGap;
2578 
	if (draw) {
27236 murrell 2579 
	    PMoveTo(savedX + hshift, savedY + vshift, mc);
2580 
	    orderBBox = RenderScript(order, draw, mc, gc, dd);
2028 ihaka 2581 
	}
2582 
	orderBBox = EnlargeBBox(orderBBox, vshift, 0, hshift);
1839 ihaka 2583 
    }
2028 ihaka 2584 
    else
2585 
	orderBBox = NullBBox();
2586 
    if (draw) {
27236 murrell 2587 
	int savedlty = gc->lty;
2588 
	double savedlwd = gc->lwd;
2589 
	PMoveTo(savedX + leadWidth - radWidth, savedY, mc);
2590 
	PMoveUp(0.8 * twiddleHeight, mc);
2591 
	x[0] = ConvertedX(mc, dd);
2592 
	y[0] = ConvertedY(mc, dd);
2593 
	PMoveUp(0.2 * twiddleHeight, mc);
2594 
	PMoveAcross(0.3 * radWidth, mc);
2595 
	x[1] = ConvertedX(mc, dd);
2596 
	y[1] = ConvertedY(mc, dd);
2597 
	PMoveUp(-(twiddleHeight + bboxDepth(bodyBBox)), mc);
2598 
	PMoveAcross(0.3 * radWidth, mc);
2599 
	x[2] = ConvertedX(mc, dd);
2600 
	y[2] = ConvertedY(mc, dd);
2601 
	PMoveUp(bboxDepth(bodyBBox) + bboxHeight(bodyBBox) + radGap, mc);
2602 
	PMoveAcross(0.4 * radWidth, mc);
2603 
	x[3] = ConvertedX(mc, dd);
2604 
	y[3] = ConvertedY(mc, dd);
2605 
	PMoveAcross(radSpace + bboxWidth(bodyBBox) + radTrail, mc);
2606 
	x[4] = ConvertedX(mc, dd);
2607 
	y[4] = ConvertedY(mc, dd);
2608 
	gc->lty = LTY_SOLID;
37301 murrell 2609 
	if (gc->lwd > 1)
2610 
	    gc->lwd = 1;
27236 murrell 2611 
	GEPolyline(5, x, y, gc, dd);
2612 
	PMoveTo(savedX, savedY, mc);
2613 
	gc->lty = savedlty;
2614 
	gc->lwd = savedlwd;
2028 ihaka 2615 
    }
32392 ripley 2616 
    orderBBox =
2617 
	CombineAlignedBBoxes(orderBBox,
2618 
			     RenderGap(leadWidth + radSpace, draw, mc, gc, dd));
27236 murrell 2619 
    SetPrimeStyle(style, mc, gc);
32392 ripley 2620 
    orderBBox = CombineBBoxes(orderBBox,
2621 
			      RenderElement(body, draw, mc, gc, dd));
2622 
    orderBBox = CombineBBoxes(orderBBox,
2623 
			      RenderGap(2 * radTrail, draw, mc, gc, dd));
16224 maechler 2624 
    orderBBox = EnlargeBBox(orderBBox, radGap, 0, 0);/* << fixes PR#1101 */
27236 murrell 2625 
    SetStyle(style, mc, gc);
2028 ihaka 2626 
    return orderBBox;
2 r 2627 
}
2628 
 
2028 ihaka 2629 
/*----------------------------------------------------------------------
2630 
 *
2631 
 *  Code for Absolute Value Expressions (abs)
2632 
 *
2633 
 */
2 r 2634 
 
2028 ihaka 2635 
static int AbsAtom(SEXP expr)
2 r 2636 
{
2028 ihaka 2637 
    return NameAtom(expr) && NameMatch(expr, "abs");
2 r 2638 
}
2639 
 
32392 ripley 2640 
static BBOX RenderAbs(SEXP expr, int draw, mathContext *mc,
2641 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2642 
{
27236 murrell 2643 
    BBOX bbox = RenderElement(CADR(expr), 0, mc, gc, dd);
2028 ihaka 2644 
    double height = bboxHeight(bbox);
2645 
    double depth = bboxDepth(bbox);
1839 ihaka 2646 
    double x[2], y[2];
2 r 2647 
 
27236 murrell 2648 
    bbox= RenderGap(MuSpace(gc, dd), draw, mc, gc, dd);
2028 ihaka 2649 
    if (draw) {
27236 murrell 2650 
	int savedlty = gc->lty;
2651 
	double savedlwd = gc->lwd;
2652 
	PMoveUp(-depth, mc);
2653 
	x[0] = ConvertedX(mc, dd);
2654 
	y[0] = ConvertedY(mc, dd);
2655 
	PMoveUp(depth + height, mc);
2656 
	x[1] = ConvertedX(mc, dd);
2657 
	y[1] = ConvertedY(mc, dd);
2658 
	gc->lty = LTY_SOLID;
37301 murrell 2659 
	if (gc->lwd > 1)
2660 
	    gc->lwd = 1;
27236 murrell 2661 
	GEPolyline(2, x, y, gc, dd);
2662 
	PMoveUp(-height, mc);
2663 
	gc->lty = savedlty;
2664 
	gc->lwd = savedlwd;
2028 ihaka 2665 
    }
27236 murrell 2666 
    bbox = CombineBBoxes(bbox, RenderGap(MuSpace(gc, dd), draw, mc, gc, dd));
2667 
    bbox = CombineBBoxes(bbox, RenderElement(CADR(expr), draw, mc, gc, dd));
2668 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2669 
    bbox = CombineBBoxes(bbox, RenderGap(MuSpace(gc, dd), draw, mc, gc, dd));
2028 ihaka 2670 
    if (draw) {
27236 murrell 2671 
	int savedlty = gc->lty;
2672 
	double savedlwd = gc->lwd;
2673 
	PMoveUp(-depth, mc);
2674 
	x[0] = ConvertedX(mc, dd);
2675 
	y[0] = ConvertedY(mc, dd);
2676 
	PMoveUp(depth + height, mc);
2677 
	x[1] = ConvertedX(mc, dd);
2678 
	y[1] = ConvertedY(mc, dd);
2679 
	gc->lty = LTY_SOLID;
37301 murrell 2680 
	if (gc->lwd > 1)
2681 
	    gc->lwd = 1;
27236 murrell 2682 
	GEPolyline(2, x, y, gc, dd);
2683 
	PMoveUp(-height, mc);
2684 
	gc->lty = savedlty;
2685 
	gc->lwd = savedlwd;
2028 ihaka 2686 
    }
27236 murrell 2687 
    bbox = CombineBBoxes(bbox, RenderGap(MuSpace(gc, dd), draw, mc, gc, dd));
2028 ihaka 2688 
    return bbox;
2 r 2689 
}
2690 
 
2028 ihaka 2691 
/*----------------------------------------------------------------------
2692 
 *
2693 
 *  Code for Grouped Expressions (i.e. { ... } )
2694 
 *
2695 
 */
2 r 2696 
 
2028 ihaka 2697 
static int CurlyAtom(SEXP expr)
2 r 2698 
{
2028 ihaka 2699 
    return NameAtom(expr) &&
2700 
	NameMatch(expr, "{");
2 r 2701 
}
2702 
 
32392 ripley 2703 
static BBOX RenderCurly(SEXP expr, int draw, mathContext *mc,
2704 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2705 
{
27236 murrell 2706 
    return RenderElement(CADR(expr), draw, mc, gc, dd);
2 r 2707 
}
2708 
 
2709 
 
2028 ihaka 2710 
/*----------------------------------------------------------------------
2711 
 *
2712 
 *  Code for Relation Expressions (i.e. ... ==, !=, ...)
2713 
 *
2714 
 */
2 r 2715 
 
3475 pd 2716 
				/* Binary Relationships */
7824 ripley 2717 
static
2028 ihaka 2718 
SymTab RelTable[] = {
3865 pd 2719 
    { "<",		 60 },	/* less */
2720 
    { "==",		 61 },	/* equal */
2721 
    { ">",		 62 },	/* greater */
2722 
    { "%=~%",		 64 },	/* congruent */
2723 
    { "!=",		185 },	/* not equal */
2724 
    { "<=",		163 },	/* less or equal */
2725 
    { ">=",		179 },	/* greater or equal */
2726 
    { "%==%",		186 },	/* equivalence */
2727 
    { "%~~%",		187 },	/* approxequal */
8061 murrell 2728 
    { "%prop%",         181 },  /* proportional to */
2 r 2729 
 
3865 pd 2730 
    { "%<->%",		171 },	/* Arrows */
2731 
    { "%<-%",		172 },
2732 
    { "%up%",		173 },
2733 
    { "%->%",		174 },
2734 
    { "%down%",		175 },
2735 
    { "%<=>%",		219 },
2736 
    { "%<=%",		220 },
2737 
    { "%dblup%",	221 },
2738 
    { "%=>%",		222 },
2739 
    { "%dbldown%",	223 },
2 r 2740 
 
3865 pd 2741 
    { "%supset%",	201 },	/* Sets (TeX Names) */
2742 
    { "%supseteq%",	202 },
2743 
    { "%notsubset%",	203 },
2744 
    { "%subset%",	204 },
2745 
    { "%subseteq%",	205 },
2746 
    { "%in%",		206 },
2747 
    { "%notin%",	207 },
2 r 2748 
 
3865 pd 2749 
    { NULL,		  0 },
2028 ihaka 2750 
};
1016 maechler 2751 
 
2028 ihaka 2752 
static int RelAtom(SEXP expr)
2 r 2753 
{
2028 ihaka 2754 
    int i;
2755 
    for (i = 0; RelTable[i].code; i++)
2756 
	if (NameMatch(expr, RelTable[i].name))
2757 
	    return RelTable[i].code;
2758 
    return 0;
2 r 2759 
}
2760 
 
32392 ripley 2761 
static BBOX RenderRel(SEXP expr, int draw, mathContext *mc,
2762 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2763 
{
2028 ihaka 2764 
    int op = RelAtom(CAR(expr));
2765 
    int nexpr = length(expr);
2766 
    BBOX bbox;
2767 
    double gap;
2 r 2768 
 
2028 ihaka 2769 
    if(nexpr == 3) {
27236 murrell 2770 
	gap = (mc->CurrentStyle > STYLE_S) ? ThickSpace(gc, dd) : 0;
2771 
	bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2772 
	bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2773 
	bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
2774 
	bbox = CombineBBoxes(bbox, RenderSymbolChar(op, draw, mc, gc, dd));
2775 
	bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
32392 ripley 2776 
	return
2777 
	    CombineBBoxes(bbox, RenderElement(CADDR(expr), draw, mc, gc, dd));
2 r 2778 
    }
32871 ripley 2779 
    else error(_("invalid mathematical annotation"));
3865 pd 2780 
 
2781 
    return NullBBox();		/* -Wall */
2 r 2782 
}
2783 
 
1016 maechler 2784 
 
2028 ihaka 2785 
/*----------------------------------------------------------------------
2786 
 *
2787 
 *  Code for Boldface Expressions
2788 
 *
2789 
 */
2 r 2790 
 
2028 ihaka 2791 
static int BoldAtom(SEXP expr)
2 r 2792 
{
2028 ihaka 2793 
    return NameAtom(expr) &&
2794 
	NameMatch(expr, "bold");
2 r 2795 
}
2796 
 
32392 ripley 2797 
static BBOX RenderBold(SEXP expr, int draw, mathContext *mc,
2798 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2799 
{
2028 ihaka 2800 
    BBOX bbox;
27236 murrell 2801 
    FontType prevfont = SetFont(BoldFont, gc);
2802 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2803 
    SetFont(prevfont, gc);
2028 ihaka 2804 
    return bbox;
2 r 2805 
}
2806 
 
2028 ihaka 2807 
/*----------------------------------------------------------------------
2808 
 *
2809 
 *  Code for Italic Expressions
2810 
 *
2811 
 */
2 r 2812 
 
2028 ihaka 2813 
static int ItalicAtom(SEXP expr)
2 r 2814 
{
2028 ihaka 2815 
    return NameAtom(expr) &&
2816 
	(NameMatch(expr, "italic") || NameMatch(expr, "math"));
2 r 2817 
}
2818 
 
32392 ripley 2819 
static BBOX RenderItalic(SEXP expr, int draw, mathContext *mc,
2820 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2821 
{
2028 ihaka 2822 
    BBOX bbox;
27236 murrell 2823 
    FontType prevfont = SetFont(ItalicFont, gc);
2824 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2825 
    SetFont(prevfont, gc);
2028 ihaka 2826 
    return bbox;
2 r 2827 
}
2828 
 
2028 ihaka 2829 
/*----------------------------------------------------------------------
2830 
 *
2831 
 *  Code for Plain (i.e. Roman) Expressions
2832 
 *
2833 
 */
2 r 2834 
 
2028 ihaka 2835 
static int PlainAtom(SEXP expr)
2 r 2836 
{
2028 ihaka 2837 
    return NameAtom(expr) &&
2838 
	NameMatch(expr, "plain");
2 r 2839 
}
2840 
 
32392 ripley 2841 
static BBOX RenderPlain(SEXP expr, int draw, mathContext *mc,
2842 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2843 
{
2028 ihaka 2844 
    BBOX bbox;
27236 murrell 2845 
    int prevfont = SetFont(PlainFont, gc);
2846 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2847 
    SetFont(prevfont, gc);
2028 ihaka 2848 
    return bbox;
2 r 2849 
}
2850 
 
2028 ihaka 2851 
/*----------------------------------------------------------------------
2852 
 *
42633 murrell 2853 
 *  Code for SymbolFace (i.e. font = 5) Expressions
2854 
 *
2855 
 *  This makes the default font an Adobe Symbol Encoded font
2856 
 *  (provides access to any character in the Adobe Symbol Font
2857 
 *   encoding via strings like "\042" for the universal ["for all"]
2858 
 *   symbol, without the need for separate special names for each
2859 
 *   of these symbols).
2860 
 *
2861 
 */
2862 
 
2863 
static int SymbolFaceAtom(SEXP expr)
2864 
{
2865 
    return NameAtom(expr) &&
2866 
	NameMatch(expr, "symbol");
2867 
}
2868 
 
2869 
static BBOX RenderSymbolFace(SEXP expr, int draw, mathContext *mc,
2870 
                             R_GE_gcontext *gc, GEDevDesc *dd)
2871 
{
2872 
    BBOX bbox;
2873 
    int prevfont = SetFont(SymbolFont, gc);
2874 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2875 
    SetFont(prevfont, gc);
2876 
    return bbox;
2877 
}
2878 
 
2879 
/*----------------------------------------------------------------------
2880 
 *
2028 ihaka 2881 
 *  Code for Bold Italic Expressions
2882 
 *
2883 
 */
2 r 2884 
 
2028 ihaka 2885 
static int BoldItalicAtom(SEXP expr)
2 r 2886 
{
2028 ihaka 2887 
    return NameAtom(expr) &&
2888 
	(NameMatch(expr, "bolditalic") || NameMatch(expr, "boldmath"));
2 r 2889 
}
2890 
 
32392 ripley 2891 
static BBOX RenderBoldItalic(SEXP expr, int draw, mathContext *mc,
2892 
			     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2893 
{
2028 ihaka 2894 
    BBOX bbox;
27236 murrell 2895 
    int prevfont = SetFont(BoldItalicFont, gc);
2896 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2897 
    SetFont(prevfont, gc);
2028 ihaka 2898 
    return bbox;
2 r 2899 
}
2900 
 
2028 ihaka 2901 
/*----------------------------------------------------------------------
2902 
 *
2903 
 *  Code for Styles
2904 
 *
2905 
 */
2 r 2906 
 
2028 ihaka 2907 
static int StyleAtom(SEXP expr)
2 r 2908 
{
2028 ihaka 2909 
    return (NameAtom(expr) &&
2910 
	    (NameMatch(expr, "displaystyle") ||
2911 
	     NameMatch(expr, "textstyle")    ||
2912 
	     NameMatch(expr, "scriptstyle")   ||
2913 
	     NameMatch(expr, "scriptscriptstyle")));
2 r 2914 
}
2915 
 
32392 ripley 2916 
static BBOX RenderStyle(SEXP expr, int draw, mathContext *mc,
2917 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2918 
{
27236 murrell 2919 
    STYLE prevstyle = GetStyle(mc);
2028 ihaka 2920 
    BBOX bbox;
2122 maechler 2921 
    if (NameMatch(CAR(expr), "displaystyle"))
27236 murrell 2922 
	SetStyle(STYLE_D, mc, gc);
2122 maechler 2923 
    else if (NameMatch(CAR(expr), "textstyle"))
27236 murrell 2924 
	SetStyle(STYLE_T, mc, gc);
2122 maechler 2925 
    else if (NameMatch(CAR(expr), "scriptstyle"))
27236 murrell 2926 
	SetStyle(STYLE_S, mc, gc);
2122 maechler 2927 
    else if (NameMatch(CAR(expr), "scriptscriptstyle"))
27236 murrell 2928 
	SetStyle(STYLE_SS, mc, gc);
2929 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2930 
    SetStyle(prevstyle, mc, gc);
2028 ihaka 2931 
    return bbox;
2 r 2932 
}
2933 
 
2028 ihaka 2934 
/*----------------------------------------------------------------------
2935 
 *
2936 
 *  Code for Phantom Expressions
2937 
 *
2938 
 */
2 r 2939 
 
2028 ihaka 2940 
static int PhantomAtom(SEXP expr)
2 r 2941 
{
2028 ihaka 2942 
    return (NameAtom(expr) &&
2943 
	    (NameMatch(expr, "phantom") ||
2944 
	     NameMatch(expr, "vphantom")));
2 r 2945 
}
2946 
 
32392 ripley 2947 
static BBOX RenderPhantom(SEXP expr, int draw, mathContext *mc,
2948 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2949 
{
27236 murrell 2950 
    BBOX bbox = RenderElement(CADR(expr), 0, mc, gc, dd);
2028 ihaka 2951 
    if (NameMatch(CAR(expr), "vphantom")) {
2952 
	bboxWidth(bbox) = 0;
2953 
	bboxItalic(bbox) = 0;
2954 
    }
27236 murrell 2955 
    else RenderGap(bboxWidth(bbox), draw, mc, gc, dd);
2028 ihaka 2956 
    return bbox;
2 r 2957 
}
2958 
 
2028 ihaka 2959 
/*----------------------------------------------------------------------
2960 
 *
2961 
 *  Code for Concatenate Expressions
2962 
 *
2963 
 */
2 r 2964 
 
2028 ihaka 2965 
static int ConcatenateAtom(SEXP expr)
2 r 2966 
{
2028 ihaka 2967 
    return NameAtom(expr) && NameMatch(expr, "paste");
2 r 2968 
}
2969 
 
32392 ripley 2970 
static BBOX RenderConcatenate(SEXP expr, int draw, mathContext *mc,
2971 
			      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2972 
{
3786 pd 2973 
    BBOX bbox = NullBBox();
2028 ihaka 2974 
    int i, n;
2 r 2975 
 
2028 ihaka 2976 
    expr = CDR(expr);
2977 
    n = length(expr);
2 r 2978 
 
2028 ihaka 2979 
    for (i = 0; i < n; i++) {
27236 murrell 2980 
	bbox = CombineBBoxes(bbox, RenderElement(CAR(expr), draw, mc, gc, dd));
2028 ihaka 2981 
	if (i != n - 1)
27236 murrell 2982 
	    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2028 ihaka 2983 
	expr = CDR(expr);
2984 
    }
2985 
    return bbox;
2 r 2986 
}
2987 
 
2028 ihaka 2988 
/*----------------------------------------------------------------------
2989 
 *
2990 
 *  Code for Comma-Separated Lists
2991 
 *
2992 
 */
2 r 2993 
 
32392 ripley 2994 
static BBOX RenderCommaList(SEXP expr, int draw, mathContext *mc,
2995 
			    R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2996 
{
2028 ihaka 2997 
    BBOX bbox = NullBBox();
27236 murrell 2998 
    double small = 0.4 * ThinSpace(gc, dd);
2028 ihaka 2999 
    int i, n;
3000 
    n = length(expr);
3001 
    for (i = 0; i < n; i++) {
3002 
	if (NameAtom(CAR(expr)) && NameMatch(CAR(expr), "...")) {
3003 
	    if (i > 0) {
32392 ripley 3004 
		bbox = CombineBBoxes(bbox, RenderSymbolChar(S_COMMA, draw,
3005 
							    mc, gc, dd));
3006 
		bbox = CombineBBoxes(bbox, RenderSymbolChar(S_SPACE, draw,
3007 
							    mc, gc, dd));
2028 ihaka 3008 
	    }
32392 ripley 3009 
	    bbox = CombineBBoxes(bbox, RenderSymbolChar(S_ELLIPSIS, draw,
3010 
							mc, gc, dd));
27236 murrell 3011 
	    bbox = CombineBBoxes(bbox, RenderGap(small, draw, mc, gc, dd));
2028 ihaka 3012 
	}
3013 
	else {
3014 
	    if (i > 0) {
32392 ripley 3015 
		bbox = CombineBBoxes(bbox, RenderSymbolChar(S_COMMA, draw,
3016 
							    mc, gc, dd));
3017 
		bbox = CombineBBoxes(bbox, RenderSymbolChar(S_SPACE, draw,
3018 
							    mc, gc, dd));
2028 ihaka 3019 
	    }
32392 ripley 3020 
	    bbox = CombineBBoxes(bbox, RenderElement(CAR(expr), draw, mc,
3021 
						     gc, dd));
2028 ihaka 3022 
	}
3023 
	expr = CDR(expr);
3024 
    }
3025 
    return bbox;
2 r 3026 
}
3027 
 
2028 ihaka 3028 
/*----------------------------------------------------------------------
3029 
 *
3030 
 *  Code for General Expressions
3031 
 *
3032 
 */
2 r 3033 
 
32392 ripley 3034 
static BBOX RenderExpression(SEXP expr, int draw, mathContext *mc,
3035 
			     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 3036 
{
2028 ihaka 3037 
    BBOX bbox;
3038 
    if (NameAtom(CAR(expr)))
27236 murrell 3039 
	bbox = RenderSymbolString(CAR(expr), draw, mc, gc, dd);
2028 ihaka 3040 
    else
27236 murrell 3041 
	bbox = RenderElement(CAR(expr), draw, mc, gc, dd);
3042 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
3043 
    bbox = CombineBBoxes(bbox, RenderDelimiter(S_PARENLEFT, draw, mc, gc, dd));
3044 
    bbox = CombineBBoxes(bbox, RenderCommaList(CDR(expr), draw, mc, gc, dd));
3045 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
3046 
    bbox = CombineBBoxes(bbox, RenderDelimiter(S_PARENRIGHT, draw, mc, gc, dd));
2028 ihaka 3047 
    return bbox;
2 r 3048 
}
3049 
 
2028 ihaka 3050 
/*----------------------------------------------------------------------
3051 
 *
3052 
 *  Code for Comma Separated List Expressions
3053 
 *
3054 
 */
2 r 3055 
 
2028 ihaka 3056 
static int ListAtom(SEXP expr)
2 r 3057 
{
2028 ihaka 3058 
    return NameAtom(expr) && NameMatch(expr, "list");
2 r 3059 
}
3060 
 
32392 ripley 3061 
static BBOX RenderList(SEXP expr, int draw, mathContext *mc,
3062 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 3063 
{
27236 murrell 3064 
    return RenderCommaList(CDR(expr), draw, mc, gc, dd);
2 r 3065 
}
3066 
 
1839 ihaka 3067 
/* Dispatching procedure which determines nature of expression. */
2 r 3068 
 
2028 ihaka 3069 
 
32392 ripley 3070 
static BBOX RenderFormula(SEXP expr, int draw, mathContext *mc,
3071 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2 r 3072 
{
1839 ihaka 3073 
    SEXP head = CAR(expr);
2 r 3074 
 
2028 ihaka 3075 
    if (SpaceAtom(head))
27236 murrell 3076 
	return RenderSpace(expr, draw, mc, gc, dd);
2028 ihaka 3077 
    else if (BinAtom(head))
27236 murrell 3078 
	return RenderBin(expr, draw, mc, gc, dd);
2028 ihaka 3079 
    else if (SuperAtom(head))
27236 murrell 3080 
	return RenderSup(expr, draw, mc, gc, dd);
2028 ihaka 3081 
    else if (SubAtom(head))
27236 murrell 3082 
	return RenderSub(expr, draw, mc, gc, dd);
2028 ihaka 3083 
    else if (WideTildeAtom(head))
27236 murrell 3084 
	return RenderWideTilde(expr, draw, mc, gc, dd);
2028 ihaka 3085 
    else if (WideHatAtom(head))
27236 murrell 3086 
	return RenderWideHat(expr, draw, mc, gc, dd);
2028 ihaka 3087 
    else if (BarAtom(head))
27236 murrell 3088 
	return RenderBar(expr, draw, mc, gc, dd);
2028 ihaka 3089 
    else if (AccentAtom(head))
27236 murrell 3090 
	return RenderAccent(expr, draw, mc, gc, dd);
2028 ihaka 3091 
    else if (OverAtom(head))
27236 murrell 3092 
	return RenderOver(expr, draw, mc, gc, dd);
31430 ripley 3093 
    else if (UnderlAtom(head))
3094 
        return RenderUnderl(expr, draw, mc, gc, dd);
2028 ihaka 3095 
    else if (AtopAtom(head))
27236 murrell 3096 
	return RenderAtop(expr, draw, mc, gc, dd);
2028 ihaka 3097 
    else if (ParenAtom(head))
27236 murrell 3098 
	return RenderParen(expr, draw, mc, gc, dd);
2028 ihaka 3099 
    else if (BGroupAtom(head))
27236 murrell 3100 
	return RenderBGroup(expr, draw, mc, gc, dd);
2028 ihaka 3101 
    else if (GroupAtom(head))
27236 murrell 3102 
	return RenderGroup(expr, draw, mc, gc, dd);
2028 ihaka 3103 
    else if (IntAtom(head))
27236 murrell 3104 
	return RenderInt(expr, draw, mc, gc, dd);
2028 ihaka 3105 
    else if (OpAtom(head))
27236 murrell 3106 
	return RenderOp(expr, draw, mc, gc, dd);
2028 ihaka 3107 
    else if (RadicalAtom(head))
27236 murrell 3108 
	return RenderRadical(expr, draw, mc, gc, dd);
2028 ihaka 3109 
    else if (AbsAtom(head))
27236 murrell 3110 
	return RenderAbs(expr, draw, mc, gc, dd);
2028 ihaka 3111 
    else if (CurlyAtom(head))
27236 murrell 3112 
	return RenderCurly(expr, draw, mc, gc, dd);
2028 ihaka 3113 
    else if (RelAtom(head))
27236 murrell 3114 
	return RenderRel(expr, draw, mc, gc, dd);
2028 ihaka 3115 
    else if (BoldAtom(head))
27236 murrell 3116 
	return RenderBold(expr, draw, mc, gc, dd);
2028 ihaka 3117 
    else if (ItalicAtom(head))
27236 murrell 3118 
	return RenderItalic(expr, draw, mc, gc, dd);
2028 ihaka 3119 
    else if (PlainAtom(head))
27236 murrell 3120 
	return RenderPlain(expr, draw, mc, gc, dd);
42633 murrell 3121 
    else if (SymbolFaceAtom(head))
3122 
	return RenderSymbolFace(expr, draw, mc, gc, dd);
2028 ihaka 3123 
    else if (BoldItalicAtom(head))
27236 murrell 3124 
	return RenderBoldItalic(expr, draw, mc, gc, dd);
2028 ihaka 3125 
    else if (StyleAtom(head))
27236 murrell 3126 
	return RenderStyle(expr, draw, mc, gc, dd);
2028 ihaka 3127 
    else if (PhantomAtom(head))
27236 murrell 3128 
	return RenderPhantom(expr, draw, mc, gc, dd);
2028 ihaka 3129 
    else if (ConcatenateAtom(head))
27236 murrell 3130 
	return RenderConcatenate(expr, draw, mc, gc, dd);
2028 ihaka 3131 
    else if (ListAtom(head))
27236 murrell 3132 
	return RenderList(expr, draw, mc, gc, dd);
1839 ihaka 3133 
    else
27236 murrell 3134 
	return RenderExpression(expr, draw, mc, gc, dd);
2 r 3135 
}
3136 
 
3137 
 
2028 ihaka 3138 
/* Dispatch on whether atom (symbol, string, number, ...) */
3139 
/* or formula (some sort of expression) */
2 r 3140 
 
32392 ripley 3141 
static BBOX RenderElement(SEXP expr, int draw, mathContext *mc,
3142 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 3143 
{
3144 
    if (FormulaExpression(expr))
27236 murrell 3145 
	return RenderFormula(expr, draw, mc, gc, dd);
1839 ihaka 3146 
    else
27236 murrell 3147 
	return RenderAtom(expr, draw, mc, gc, dd);
2 r 3148 
}
3149 
 
32392 ripley 3150 
static BBOX RenderOffsetElement(SEXP expr, double x, double y, int draw,
3151 
				mathContext *mc, R_GE_gcontext *gc,
3152 
				GEDevDesc *dd)
2028 ihaka 3153 
{
3154 
    BBOX bbox;
27236 murrell 3155 
    double savedX = mc->CurrentX;
3156 
    double savedY = mc->CurrentY;
2028 ihaka 3157 
    if (draw) {
27236 murrell 3158 
	mc->CurrentX += x;
3159 
	mc->CurrentY += y;
2028 ihaka 3160 
    }
27236 murrell 3161 
    bbox = RenderElement(expr, draw, mc, gc, dd);
2028 ihaka 3162 
    bboxWidth(bbox) += x;
3163 
    bboxHeight(bbox) += y;
3164 
    bboxDepth(bbox) -= y;
27236 murrell 3165 
    mc->CurrentX = savedX;
3166 
    mc->CurrentY = savedY;
2028 ihaka 3167 
    return bbox;
2 r 3168 
 
3169 
}
3170 
 
19875 murrell 3171 
/* Functions forming the R API */
3172 
 
2028 ihaka 3173 
/* Calculate width of expression */
3174 
/* BBOXes are in INCHES (see MetricUnit) */
3175 
 
32392 ripley 3176 
double GEExpressionWidth(SEXP expr,
27236 murrell 3177 
			 R_GE_gcontext *gc,
19875 murrell 3178 
			 GEDevDesc *dd)
2 r 3179 
{
2679 pd 3180 
    BBOX bbox;
3181 
    double width;
27236 murrell 3182 
 
3183 
    /*
3184 
     * Build a "drawing context" for the current expression
3185 
     */
3186 
    mathContext mc;
3187 
    mc.BaseCex = gc->cex;
3188 
    mc.BoxColor = name2col("pink");
3189 
    mc.CurrentStyle = STYLE_D;
3190 
    /*
3191 
     * Some "empty" values.  Will be filled in after BBox is calc'ed
3192 
     */
3193 
    mc.ReferenceX = 0;
3194 
    mc.ReferenceY = 0;
3195 
    mc.CurrentX = 0;
3196 
    mc.CurrentY = 0;
3197 
    mc.CurrentAngle = 0;
3198 
    mc.CosAngle = 0;
3199 
    mc.SinAngle = 0;
3200 
 
3201 
    SetFont(PlainFont, gc);
3202 
    bbox = RenderElement(expr, 0, &mc, gc, dd);
2679 pd 3203 
    width  = bboxWidth(bbox);
32392 ripley 3204 
    /*
20257 murrell 3205 
     * NOTE that we do fabs() here in case the device
3206 
     * runs right-to-left.
3207 
     * This is so that these calculations match those
3208 
     * for string widths and heights, where the width
3209 
     * and height of text is positive no matter how
3210 
     * the device drawing is oriented.
3211 
     */
3212 
    return fabs(toDeviceWidth(width, GE_INCHES, dd));
257 paul 3213 
}
3214 
 
32392 ripley 3215 
double GEExpressionHeight(SEXP expr,
27236 murrell 3216 
			  R_GE_gcontext *gc,
19875 murrell 3217 
			  GEDevDesc *dd)
257 paul 3218 
{
2679 pd 3219 
    BBOX bbox;
3220 
    double height;
27236 murrell 3221 
 
3222 
    /*
3223 
     * Build a "drawing context" for the current expression
3224 
     */
3225 
    mathContext mc;
3226 
    mc.BaseCex = gc->cex;
3227 
    mc.BoxColor = name2col("pink");
3228 
    mc.CurrentStyle = STYLE_D;
3229 
    /*
3230 
     * Some "empty" values.  Will be filled in after BBox is calc'ed
3231 
     */
3232 
    mc.ReferenceX = 0;
3233 
    mc.ReferenceY = 0;
3234 
    mc.CurrentX = 0;
3235 
    mc.CurrentY = 0;
3236 
    mc.CurrentAngle = 0;
3237 
    mc.CosAngle = 0;
3238 
    mc.SinAngle = 0;
3239 
 
3240 
    SetFont(PlainFont, gc);
3241 
    bbox = RenderElement(expr, 0, &mc, gc, dd);
2679 pd 3242 
    height = bboxHeight(bbox) + bboxDepth(bbox);
20257 murrell 3243 
    /* NOTE that we do fabs() here in case the device
3244 
     * draws top-to-bottom (like an X11 window).
3245 
     * This is so that these calculations match those
3246 
     * for string widths and heights, where the width
3247 
     * and height of text is positive no matter how
3248 
     * the device drawing is oriented.
3249 
     */
3250 
    return fabs(toDeviceHeight(height, GE_INCHES, dd));
257 paul 3251 
}
3252 
 
19875 murrell 3253 
void GEMathText(double x, double y, SEXP expr,
32392 ripley 3254 
		double xc, double yc, double rot,
27236 murrell 3255 
		R_GE_gcontext *gc,
19875 murrell 3256 
		GEDevDesc *dd)
2 r 3257 
{
2028 ihaka 3258 
    BBOX bbox;
27236 murrell 3259 
    mathContext mc;
6098 pd 3260 
 
3261 
#ifdef BUG61
3262 
#else
3263 
    /* IF font metric information is not available for device */
3264 
    /* then bail out */
3265 
    double ascent, descent, width;
27236 murrell 3266 
    GEMetricInfo(0, gc,
19875 murrell 3267 
		&ascent, &descent, &width, dd);
6098 pd 3268 
    if ((ascent==0) && (descent==0) && (width==0))
32871 ripley 3269 
	error(_("Metric information not available for this device"));
6098 pd 3270 
#endif
3271 
 
27236 murrell 3272 
    /*
3273 
     * Build a "drawing context" for the current expression
21062 murrell 3274 
     */
27236 murrell 3275 
    mc.BaseCex = gc->cex;
3276 
    mc.BoxColor = name2col("pink");
3277 
    mc.CurrentStyle = STYLE_D;
3278 
    /*
3279 
     * Some "empty" values.  Will be filled in after BBox is calc'ed
3280 
     */
3281 
    mc.ReferenceX = 0;
3282 
    mc.ReferenceY = 0;
3283 
    mc.CurrentX = 0;
3284 
    mc.CurrentY = 0;
3285 
    mc.CurrentAngle = 0;
3286 
    mc.CosAngle = 0;
3287 
    mc.SinAngle = 0;
3288 
 
3289 
    SetFont(PlainFont, gc);
3290 
    bbox = RenderElement(expr, 0, &mc, gc, dd);
3291 
    mc.ReferenceX = fromDeviceX(x, GE_INCHES, dd);
3292 
    mc.ReferenceY = fromDeviceY(y, GE_INCHES, dd);
5107 maechler 3293 
    if (R_FINITE(xc))
27236 murrell 3294 
	mc.CurrentX = mc.ReferenceX - xc * bboxWidth(bbox);
2028 ihaka 3295 
    else
18202 murrell 3296 
	/* Paul 11/2/02
3297 
	 * If xc == NA then should centre horizontally.
3298 
	 * Used to left-adjust.
3299 
	 */
27236 murrell 3300 
	mc.CurrentX = mc.ReferenceX - 0.5 * bboxWidth(bbox);
5107 maechler 3301 
    if (R_FINITE(yc))
27236 murrell 3302 
	mc.CurrentY = mc.ReferenceY + bboxDepth(bbox)
2028 ihaka 3303 
	    - yc * (bboxHeight(bbox) + bboxDepth(bbox));
3304 
    else
18202 murrell 3305 
	/* Paul 11/2/02
3306 
	 * If xc == NA then should centre vertically.
3307 
	 * Used to bottom-adjust.
3308 
	 */
27236 murrell 3309 
	mc.CurrentY = mc.ReferenceY + bboxDepth(bbox)
18202 murrell 3310 
	    - 0.5 * (bboxHeight(bbox) + bboxDepth(bbox));
27236 murrell 3311 
    mc.CurrentAngle = rot;
7527 maechler 3312 
    rot *= M_PI_2 / 90 ;/* radians */
27236 murrell 3313 
    mc.CosAngle = cos(rot);
3314 
    mc.SinAngle = sin(rot);
3315 
    RenderElement(expr, 1, &mc, gc, dd);
43133 ripley 3316 
}/* GEMathText */
2 r 3317 
 
3318 
 
19875 murrell 3319 
/********************************
3320 
 * Code below here ...
32392 ripley 3321 
 * ... should be moved to base.c and
19875 murrell 3322 
 * ... is part of the base graphics API NOT the graphics engine API
3323 
 ********************************
3324 
 */
3325 
double GExpressionWidth(SEXP expr, GUnit units, DevDesc *dd)
3326 
{
27236 murrell 3327 
    R_GE_gcontext gc;
32392 ripley 3328 
    double width;
27236 murrell 3329 
    gcontextFromGP(&gc, dd);
3330 
    width = GEExpressionWidth(expr, &gc, (GEDevDesc*) dd);
19875 murrell 3331 
    if (units == DEVICE)
3332 
	return width;
3333 
    else
3334 
	return GConvertXUnits(width, DEVICE, units, dd);
3335 
}
3336 
 
3337 
double GExpressionHeight(SEXP expr, GUnit units, DevDesc *dd)
3338 
{
27236 murrell 3339 
    R_GE_gcontext gc;
3340 
    double height;
3341 
    gcontextFromGP(&gc, dd);
3342 
    height = GEExpressionHeight(expr, &gc, (GEDevDesc*) dd);
19875 murrell 3343 
    if (units == DEVICE)
3344 
	return height;
3345 
    else
3346 
	return GConvertYUnits(height, DEVICE, units, dd);
3347 
}
3348 
 
19876 murrell 3349 
/* This is just here to satisfy the Rgraphics.h API.
32392 ripley 3350 
 * This allows new graphics API (GraphicsDevice.h, GraphicsEngine.h)
19876 murrell 3351 
 * to be developed alongside.
3352 
 * Could be removed if Rgraphics.h ever gets REPLACED by new API
3353 
 * NOTE that base graphics code no longer calls this -- the base
3354 
 * graphics system directly calls the graphics engine for mathematical
3355 
 * annotation (GEMathText)
3356 
 */
3357 
void GMathText(double x, double y, int coords, SEXP expr,
32392 ripley 3358 
	       double xc, double yc, double rot,
19876 murrell 3359 
	       DevDesc *dd)
3360 
{
27236 murrell 3361 
    R_GE_gcontext gc;
3362 
    gcontextFromGP(&gc, dd);
19876 murrell 3363 
    GConvert(&x, &y, coords, DEVICE, dd);
20197 murrell 3364 
    GClip(dd);
27236 murrell 3365 
    GEMathText(x, y, expr, xc, yc, rot, &gc, (GEDevDesc*) dd);
19876 murrell 3366 
}
3367 
 
2028 ihaka 3368 
void GMMathText(SEXP str, int side, double line, int outer,
30998 murrell 3369 
		double at, int las, double yadj, DevDesc *dd)
2 r 3370 
{
13400 hornik 3371 
    int coords = 0, subcoords;
30998 murrell 3372 
    double xadj, angle = 0;
2 r 3373 
 
6098 pd 3374 
#ifdef BUG61
3375 
#else
3376 
    /* IF font metric information is not available for device */
3377 
    /* then bail out */
3378 
    double ascent, descent, width;
3379 
    GMetricInfo(0, &ascent, &descent, &width, DEVICE, dd);
3380 
    if ((ascent==0) && (descent==0) && (width==0))
32871 ripley 3381 
	error(_("Metric information not available for this device"));
6098 pd 3382 
#endif
3383 
 
19875 murrell 3384 
    xadj = Rf_gpptr(dd)->adj;
12841 murrell 3385 
 
3386 
    /* This is MOSTLY the same as the same section of GMtext
3387 
     * BUT it differs because it sets different values for yadj for
3388 
     * different situations.
3389 
     * Paul
3390 
     */
30998 murrell 3391 
     /* changed to unify behaviour with changes in GMText. Uwe */
12841 murrell 3392 
    if(outer) {
3393 
	switch(side) {
3394 
	case 1:	    coords = OMA1;	break;
3395 
	case 2:	    coords = OMA2;	break;
3396 
	case 3:	    coords = OMA3;	break;
3397 
	case 4:	    coords = OMA4;	break;
2 r 3398 
	}
12841 murrell 3399 
	subcoords = NIC;
1839 ihaka 3400 
    }
3401 
    else {
12841 murrell 3402 
	switch(side) {
3403 
	case 1:	    coords = MAR1;	break;
3404 
	case 2:	    coords = MAR2;	break;
3405 
	case 3:	    coords = MAR3;	break;
3406 
	case 4:	    coords = MAR4;	break;
2 r 3407 
	}
12841 murrell 3408 
	subcoords = USER;
1839 ihaka 3409 
    }
17179 murrell 3410 
    /* Note: I changed Rf_gpptr(dd)->yLineBias to 0.3 here. */
12841 murrell 3411 
    /* Purely visual tuning. RI */
16224 maechler 3412 
    /* Note: I removed the 0.3 fiddle here because mathematical
15168 pd 3413 
     * annotation stuff can do "exact" centering.
3414 
     * i.e., 0.3 fiddle is effectively replaced by yadj=0.5
3415 
     */
12841 murrell 3416 
    switch(side) {
3417 
    case 1:
3418 
	if(las == 2 || las == 3) {
3419 
	    angle = 90;
3420 
	}
3421 
	else {
18202 murrell 3422 
	    /*	    line = line + 1 - Rf_gpptr(dd)->yLineBias;
3423 
		    angle = 0;
3424 
		    yadj = NA_REAL; */
3425 
	    line = line + 1;
12841 murrell 3426 
	    angle = 0;
3427 
	}
3428 
	break;
3429 
    case 2:
3430 
	if(las == 1 || las == 2) {
3431 
	    angle = 0;
3432 
	}
3433 
	else {
18202 murrell 3434 
	    /*	    line = line + Rf_gpptr(dd)->yLineBias;
3435 
		    angle = 90;
3436 
		    yadj = NA_REAL; */
12841 murrell 3437 
	    angle = 90;
3438 
	}
3439 
	break;
3440 
    case 3:
3441 
	if(las == 2 || las == 3) {
3442 
	    angle = 90;
3443 
	}
3444 
	else {
18202 murrell 3445 
	    /*   line = line + Rf_gpptr(dd)->yLineBias;
3446 
		 angle = 0;
3447 
		 yadj = NA_REAL; */
12841 murrell 3448 
	    angle = 0;
3449 
	}
3450 
	break;
3451 
    case 4:
3452 
	if(las == 1 || las == 2) {
3453 
	    angle = 0;
3454 
	}
3455 
	else {
18202 murrell 3456 
	    /*   line = line + 1 - Rf_gpptr(dd)->yLineBias;
3457 
		 angle = 90;
3458 
		 yadj = NA_REAL; */
3459 
	    line = line + 1;
12841 murrell 3460 
	    angle = 90;
3461 
	}
3462 
	break;
3463 
    }
27236 murrell 3464 
    GMathText(at, line, coords, str, xadj, yadj, angle, dd);
10886 maechler 3465 
}/* GMMathText */