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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
7527 maechler 4 
 *  Copyright (C) 1998-2000	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
2 r 8 
 *
9 
 *  This program is free software; you can redistribute it and/or modify
10 
 *  it under the terms of the GNU General Public License as published by
11 
 *  the Free Software Foundation; either version 2 of the License, or
12 
 *  (at your option) any later version.
13 
 *
14 
 *  This program is distributed in the hope that it will be useful,
15 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 
 *  GNU General Public License for more details.
18 
 *
19 
 *  You should have received a copy of the GNU General Public License
20 
 *  along with this program; if not, write to the Free Software
5458 ripley 21 
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
2 r 22 
 */
23 
 
32392 ripley 24 
/* <UTF8-FIXME>
32397 ripley 25 
   byte-level access and use of ctype functions for symbol font
26 
 
27 
   Has encoding of symbol font hard-coded.  Not clear if this is enough.
32380 ripley 28 
*/
29 
 
5187 hornik 30 
#ifdef HAVE_CONFIG_H
7701 hornik 31 
#include <config.h>
5187 hornik 32 
#endif
33 
 
5233 hornik 34 
#include <ctype.h>
32624 ripley 35 
#ifdef SUPPORT_MBCS
32397 ripley 36 
# include <wchar.h>
37 
# include <wctype.h>
38 
#endif
5233 hornik 39 
 
32397 ripley 40 
 
11499 ripley 41 
#include <Defn.h>
42 
#include <Rmath.h>
43 
#include <Graphics.h>
1926 ihaka 44 
 
5233 hornik 45 
 
27236 murrell 46 
/*
47 
 *  TeX Math Styles
48 
 *
49 
 *  The TeXBook, Appendix G, Page 441.
50 
 *
51 
 */
2 r 52 
 
27236 murrell 53 
typedef enum {
54 
    STYLE_SS1 = 1,
55 
    STYLE_SS  = 2,
56 
    STYLE_S1  = 3,
57 
    STYLE_S   = 4,
58 
    STYLE_T1  = 5,
59 
    STYLE_T   = 6,
60 
    STYLE_D1  = 7,
61 
    STYLE_D   = 8
62 
} STYLE;
63 
 
64 
typedef struct {
65 
    unsigned int BoxColor;
66 
    double BaseCex;
67 
    double ReferenceX;
68 
    double ReferenceY;
69 
    double CurrentX;
70 
    double CurrentY;
71 
    double CurrentAngle;
72 
    double CosAngle;
73 
    double SinAngle;
74 
    STYLE CurrentStyle;
75 
} mathContext;
76 
 
19875 murrell 77 
static GEUnit MetricUnit = GE_INCHES;
581 paul 78 
 
2028 ihaka 79 
/* Font Definitions */
2 r 80 
 
2028 ihaka 81 
typedef enum {
3475 pd 82 
    PlainFont	   = 1,
83 
    BoldFont	   = 2,
84 
    ItalicFont	   = 3,
2028 ihaka 85 
    BoldItalicFont = 4,
6098 pd 86 
    SymbolFont	   = 5
2028 ihaka 87 
} FontType;
88 
 
2122 maechler 89 
/*
2028 ihaka 90 
 *  Italic Correction Factor
91 
 *
92 
 *  The correction for a character is computed as ItalicFactor
93 
 *  times the height (above the baseline) of the character's
94 
 *  bounding box.
95 
 *
96 
 */
97 
 
98 
static double ItalicFactor = 0.15;
99 
 
100 
/* Drawing basics */
101 
 
102 
 
103 
/* Convert CurrentX and CurrentY from */
104 
/* 0 angle to and CurrentAngle */
105 
 
27236 murrell 106 
static double ConvertedX(mathContext *mc, GEDevDesc *dd)
2 r 107 
{
27236 murrell 108 
    double rotatedX = mc->ReferenceX +
109 
	(mc->CurrentX - mc->ReferenceX) * mc->CosAngle -
110 
	(mc->CurrentY - mc->ReferenceY) * mc->SinAngle;
111 
    return toDeviceX(rotatedX, MetricUnit, dd);
2 r 112 
}
113 
 
27236 murrell 114 
static double ConvertedY(mathContext *mc, GEDevDesc *dd)
2028 ihaka 115 
{
27236 murrell 116 
    double rotatedY = mc->ReferenceY +
117 
	(mc->CurrentY - mc->ReferenceY) * mc->CosAngle +
118 
	(mc->CurrentX - mc->ReferenceX) * mc->SinAngle;
119 
    return toDeviceY(rotatedY, MetricUnit, dd);
2028 ihaka 120 
}
2 r 121 
 
27236 murrell 122 
static void PMoveAcross(double xamount, mathContext *mc)
2 r 123 
{
27236 murrell 124 
    mc->CurrentX += xamount;
2 r 125 
}
126 
 
27236 murrell 127 
static void PMoveUp(double yamount, mathContext *mc)
2028 ihaka 128 
{
27236 murrell 129 
    mc->CurrentY += yamount;
2028 ihaka 130 
}
2 r 131 
 
27236 murrell 132 
static void PMoveTo(double x, double y, mathContext *mc)
2 r 133 
{
27236 murrell 134 
    mc->CurrentX = x;
135 
    mc->CurrentY = y;
2 r 136 
}
137 
 
2028 ihaka 138 
/* Basic Font Properties */
139 
 
27236 murrell 140 
static double xHeight(R_GE_gcontext *gc, GEDevDesc *dd)
2 r 141 
{
2028 ihaka 142 
    double height, depth, width;
27236 murrell 143 
    GEMetricInfo('x', gc,
144 
		&height, &depth, &width, dd);
145 
    return fromDeviceHeight(height, MetricUnit, dd);
2028 ihaka 146 
}
2 r 147 
 
27236 murrell 148 
static double XHeight(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 149 
{
150 
    double height, depth, width;
27236 murrell 151 
    GEMetricInfo('X', gc,
152 
		&height, &depth, &width, dd);
153 
    return fromDeviceHeight(height, MetricUnit, dd);
2 r 154 
}
155 
 
27236 murrell 156 
static double AxisHeight(R_GE_gcontext *gc, GEDevDesc *dd)
2 r 157 
{
2028 ihaka 158 
    double height, depth, width;
27236 murrell 159 
    GEMetricInfo('+', gc,
160 
		&height, &depth, &width, dd);
161 
    return fromDeviceHeight(0.5 * height, MetricUnit, dd);
2 r 162 
}
163 
 
27236 murrell 164 
static double Quad(R_GE_gcontext *gc, GEDevDesc *dd)
2 r 165 
{
2028 ihaka 166 
    double height, depth, width;
27236 murrell 167 
    GEMetricInfo('M', gc,
168 
		&height, &depth, &width, dd);
169 
    return fromDeviceHeight(width, MetricUnit, dd);
2028 ihaka 170 
}
171 
 
2105 ihaka 172 
/* The height of digits */
27236 murrell 173 
static double FigHeight(R_GE_gcontext *gc, GEDevDesc *dd)
2105 ihaka 174 
{
175 
    double height, depth, width;
27236 murrell 176 
    GEMetricInfo('0', gc,
177 
		&height, &depth, &width, dd);
178 
    return fromDeviceHeight(height, MetricUnit, dd);
2105 ihaka 179 
}
180 
 
181 
/* Depth of lower case descenders */
27236 murrell 182 
static double DescDepth(R_GE_gcontext *gc, GEDevDesc *dd)
2105 ihaka 183 
{
184 
    double height, depth, width;
27236 murrell 185 
    GEMetricInfo('g', gc,
186 
		&height, &depth, &width, dd);
187 
    return fromDeviceHeight(depth, MetricUnit, dd);
2105 ihaka 188 
}
189 
 
190 
/* Thickness of rules */
191 
static double RuleThickness()
192 
{
193 
    return 0.015;
194 
}
195 
 
27236 murrell 196 
static double ThinSpace(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 197 
{
198 
    double height, depth, width;
199 
    static double OneSixth = 0.16666666666666666666;
27236 murrell 200 
    GEMetricInfo('M', gc,
201 
		&height, &depth, &width, dd);
202 
    return fromDeviceHeight(OneSixth * width, MetricUnit, dd);
2028 ihaka 203 
}
204 
 
27236 murrell 205 
static double MediumSpace(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 206 
{
207 
    double height, depth, width;
208 
    static double TwoNinths = 0.22222222222222222222;
27236 murrell 209 
    GEMetricInfo('M', gc,
210 
		&height, &depth, &width, dd);
211 
    return fromDeviceHeight(TwoNinths * width, MetricUnit, dd);
2028 ihaka 212 
}
213 
 
27236 murrell 214 
static double ThickSpace(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 215 
{
216 
    double height, depth, width;
217 
    static double FiveEighteenths = 0.27777777777777777777;
27236 murrell 218 
    GEMetricInfo('M', gc,
219 
		&height, &depth, &width, dd);
220 
    return fromDeviceHeight(FiveEighteenths * width, MetricUnit, dd);
2028 ihaka 221 
}
222 
 
27236 murrell 223 
static double MuSpace(R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 224 
{
225 
    double height, depth, width;
226 
    static double OneEighteenth = 0.05555555555555555555;
27236 murrell 227 
    GEMetricInfo('M', gc,
228 
		&height, &depth, &width, dd);
229 
    return fromDeviceHeight(OneEighteenth * width, MetricUnit, dd);
2028 ihaka 230 
}
231 
 
232 
 
233 
/*
234 
 *  Mathematics Layout Parameters
235 
 *
2123 maechler 236 
 *  The TeXBook, Appendix G, Page 447.
2028 ihaka 237 
 *
2105 ihaka 238 
 *  These values are based on an inspection of TeX metafont files
239 
 *  together with some visual simplification.
2028 ihaka 240 
 *
2105 ihaka 241 
 *  Note : The values are ``optimised'' for PostScript.
242 
 *
2028 ihaka 243 
 */
244 
 
245 
typedef enum {
3475 pd 246 
    sigma2,  sigma5,  sigma6,  sigma8,	sigma9,	 sigma10, sigma11,
2105 ihaka 247 
    sigma12, sigma13, sigma14, sigma15, sigma16, sigma17, sigma18,
248 
    sigma19, sigma20, sigma21, sigma22, xi8, xi9, xi10, xi11, xi12, xi13
2028 ihaka 249 
}
250 
TEXPAR;
251 
 
3475 pd 252 
#define SUBS	       0.7
2028 ihaka 253 
 
27236 murrell 254 
static double TeX(TEXPAR which, R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 255 
{
256 
    switch(which) {
257 
    case sigma2:  /* space */
258 
    case sigma5:  /* x_height */
27236 murrell 259 
	return xHeight(gc, dd);
2028 ihaka 260 
 
261 
    case sigma6:  /* quad */
27236 murrell 262 
	return Quad(gc, dd);
2028 ihaka 263 
 
264 
    case sigma8:  /* num1 */
27236 murrell 265 
	return AxisHeight(gc, dd)
31989 ripley 266 
	    + 3.51 * RuleThickness()
27236 murrell 267 
	    + 0.15 * XHeight(gc, dd)		/* 54/36 * 0.1 */
268 
	    + SUBS * DescDepth(gc, dd);
2028 ihaka 269 
    case sigma9:  /* num2 */
27236 murrell 270 
	return AxisHeight(gc, dd)
31989 ripley 271 
	    + 1.51 * RuleThickness()
27236 murrell 272 
	    + 0.08333333 * XHeight(gc, dd);	/* 30/36 * 0.1 */
2028 ihaka 273 
    case sigma10: /* num3 */
27236 murrell 274 
	return AxisHeight(gc, dd)
31989 ripley 275 
	    + 1.51 * RuleThickness()
27236 murrell 276 
	    + 0.1333333 * XHeight(gc, dd);	/* 48/36 * 0.1 */
2028 ihaka 277 
    case sigma11: /* denom1 */
27236 murrell 278 
	return	- AxisHeight(gc, dd)
31989 ripley 279 
	    + 3.51 * RuleThickness()
27236 murrell 280 
	    + SUBS * FigHeight(gc, dd)
281 
	    + 0.344444 * XHeight(gc, dd);	/* 124/36 * 0.1 */
2028 ihaka 282 
    case sigma12: /* denom2 */
27236 murrell 283 
	return	- AxisHeight(gc, dd)
31989 ripley 284 
	    + 1.51 * RuleThickness()
27236 murrell 285 
	    + SUBS * FigHeight(gc, dd)
286 
	    + 0.08333333 * XHeight(gc, dd);	/* 30/36 * 0.1 */
2028 ihaka 287 
 
288 
    case sigma13: /* sup1 */
27236 murrell 289 
	return 0.95 * xHeight(gc, dd);
2028 ihaka 290 
    case sigma14: /* sup2 */
27236 murrell 291 
	return 0.825 * xHeight(gc, dd);
2028 ihaka 292 
    case sigma15: /* sup3 */
27236 murrell 293 
	return 0.7 * xHeight(gc, dd);
2028 ihaka 294 
 
295 
    case sigma16: /* sub1 */
27236 murrell 296 
	return 0.35 * xHeight(gc, dd);
2028 ihaka 297 
    case sigma17: /* sub2 */
27236 murrell 298 
	return 0.45 * XHeight(gc, dd);
2028 ihaka 299 
 
300 
    case sigma18: /* sup_drop */
27236 murrell 301 
	return 0.3861111 * XHeight(gc, dd);
2028 ihaka 302 
 
303 
    case sigma19: /* sub_drop */
27236 murrell 304 
	return 0.05 * XHeight(gc, dd);
2028 ihaka 305 
 
306 
    case sigma20: /* delim1 */
27236 murrell 307 
	return 2.39 * XHeight(gc, dd);
2028 ihaka 308 
    case sigma21: /* delim2 */
27236 murrell 309 
	return 1.01 *XHeight(gc, dd);
2028 ihaka 310 
 
311 
    case sigma22: /* axis_height */
27236 murrell 312 
	return AxisHeight(gc, dd);
2028 ihaka 313 
 
3475 pd 314 
    case xi8:	  /* default_rule_thickness */
31989 ripley 315 
	return RuleThickness();
2028 ihaka 316 
 
3475 pd 317 
    case xi9:	  /* big_op_spacing1 */
318 
    case xi10:	  /* big_op_spacing2 */
319 
    case xi11:	  /* big_op_spacing3 */
320 
    case xi12:	  /* big_op_spacing4 */
321 
    case xi13:	  /* big_op_spacing5 */
27236 murrell 322 
	return 0.15 * XHeight(gc, dd);
2692 maechler 323 
    default:/* never happens (enum type) */
32871 ripley 324 
	error(_("invalid `which' in TeX")); return 0;/*-Wall*/
2028 ihaka 325 
    }
326 
}
327 
 
27236 murrell 328 
static STYLE GetStyle(mathContext *mc)
2028 ihaka 329 
{
27236 murrell 330 
    return mc->CurrentStyle;
2028 ihaka 331 
}
332 
 
27236 murrell 333 
static void SetStyle(STYLE newstyle, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 334 
{
2122 maechler 335 
    switch (newstyle) {
2028 ihaka 336 
    case STYLE_D:
337 
    case STYLE_T:
338 
    case STYLE_D1:
339 
    case STYLE_T1:
27236 murrell 340 
	gc->cex = 1.0 * mc->BaseCex;
2028 ihaka 341 
	break;
342 
    case STYLE_S:
343 
    case STYLE_S1:
27236 murrell 344 
	gc->cex = 0.7 * mc->BaseCex;
2028 ihaka 345 
	break;
346 
    case STYLE_SS:
347 
    case STYLE_SS1:
27236 murrell 348 
	gc->cex = 0.5 * mc->BaseCex;
2028 ihaka 349 
	break;
350 
    default:
32871 ripley 351 
	error(_("invalid math style encountered"));
2028 ihaka 352 
    }
27236 murrell 353 
    mc->CurrentStyle = newstyle;
2028 ihaka 354 
}
355 
 
27236 murrell 356 
static void SetPrimeStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 357 
{
358 
    switch (style) {
359 
    case STYLE_D:
360 
    case STYLE_D1:
27236 murrell 361 
	SetStyle(STYLE_D1, mc, gc);
2028 ihaka 362 
	break;
363 
    case STYLE_T:
364 
    case STYLE_T1:
27236 murrell 365 
	SetStyle(STYLE_T1, mc, gc);
2028 ihaka 366 
	break;
367 
    case STYLE_S:
368 
    case STYLE_S1:
27236 murrell 369 
	SetStyle(STYLE_S1, mc, gc);
2028 ihaka 370 
	break;
371 
    case STYLE_SS:
372 
    case STYLE_SS1:
27236 murrell 373 
	SetStyle(STYLE_SS1, mc, gc);
2028 ihaka 374 
	break;
375 
    }
376 
}
377 
 
27236 murrell 378 
static void SetSupStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 379 
{
380 
    switch (style) {
381 
    case STYLE_D:
382 
    case STYLE_T:
27236 murrell 383 
	SetStyle(STYLE_S, mc, gc);
2028 ihaka 384 
	break;
385 
    case STYLE_D1:
386 
    case STYLE_T1:
27236 murrell 387 
	SetStyle(STYLE_S1, mc, gc);
2028 ihaka 388 
	break;
389 
    case STYLE_S:
390 
    case STYLE_SS:
27236 murrell 391 
	SetStyle(STYLE_SS, mc, gc);
2028 ihaka 392 
	break;
393 
    case STYLE_S1:
394 
    case STYLE_SS1:
27236 murrell 395 
	SetStyle(STYLE_SS1, mc, gc);
2028 ihaka 396 
	break;
397 
    }
398 
}
399 
 
27236 murrell 400 
static void SetSubStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 401 
{
402 
    switch (style) {
403 
    case STYLE_D:
404 
    case STYLE_T:
405 
    case STYLE_D1:
406 
    case STYLE_T1:
27236 murrell 407 
	SetStyle(STYLE_S1, mc, gc);
2028 ihaka 408 
	break;
409 
    case STYLE_S:
410 
    case STYLE_SS:
411 
    case STYLE_S1:
412 
    case STYLE_SS1:
27236 murrell 413 
	SetStyle(STYLE_SS1, mc, gc);
2028 ihaka 414 
	break;
415 
    }
416 
}
417 
 
27236 murrell 418 
static void SetNumStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 419 
{
420 
    switch (style) {
421 
    case STYLE_D:
27236 murrell 422 
	SetStyle(STYLE_T, mc, gc);
2028 ihaka 423 
	break;
424 
    case STYLE_D1:
27236 murrell 425 
	SetStyle(STYLE_T1, mc, gc);
2028 ihaka 426 
	break;
427 
    default:
27236 murrell 428 
	SetSupStyle(style, mc, gc);
2028 ihaka 429 
    }
430 
}
431 
 
27236 murrell 432 
static void SetDenomStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2028 ihaka 433 
{
434 
    if (style > STYLE_T)
27236 murrell 435 
	SetStyle(STYLE_T1, mc, gc);
1839 ihaka 436 
    else
27236 murrell 437 
	SetSubStyle(style, mc, gc);
2 r 438 
}
439 
 
27236 murrell 440 
static int IsCompactStyle(STYLE style, mathContext *mc, R_GE_gcontext *gc)
2 r 441 
{
2028 ihaka 442 
    switch (style) {
443 
    case STYLE_D1:
444 
    case STYLE_T1:
445 
    case STYLE_S1:
446 
    case STYLE_SS1:
447 
	return 1;
448 
    default:
449 
	return 0;
450 
    }
2 r 451 
}
452 
 
2028 ihaka 453 
 
454 
#ifdef max
455 
#undef max
456 
#endif
457 
/* Return maximum of two doubles. */
458 
static double max(double x, double y)
2 r 459 
{
2028 ihaka 460 
    if (x > y) return x;
461 
    else return y;
2 r 462 
}
463 
 
2028 ihaka 464 
 
465 
/* Bounding Boxes */
466 
/* These including italic corrections and an */
467 
/* indication of whether the nucleus was simple. */
468 
 
469 
typedef struct {
470 
    double height;
471 
    double depth;
472 
    double width;
473 
    double italic;
474 
    int simple;
475 
} BBOX;
476 
 
477 
 
478 
#define bboxHeight(bbox) bbox.height
479 
#define bboxDepth(bbox) bbox.depth
480 
#define bboxWidth(bbox) bbox.width
481 
#define bboxItalic(bbox) bbox.italic
482 
#define bboxSimple(bbox) bbox.simple
483 
 
484 
 
485 
static BBOX MakeBBox(double height, double depth, double width)
2 r 486 
{
2028 ihaka 487 
    BBOX bbox;
488 
    bboxHeight(bbox) = height;
489 
    bboxDepth(bbox)  = depth;
490 
    bboxWidth(bbox)  = width;
491 
    bboxItalic(bbox) = 0;
492 
    bboxSimple(bbox) = 0;
493 
    return bbox;
2 r 494 
}
495 
 
2028 ihaka 496 
static BBOX NullBBox()
2 r 497 
{
2028 ihaka 498 
    BBOX bbox;
499 
    bboxHeight(bbox) = 0;
500 
    bboxDepth(bbox)  = 0;
501 
    bboxWidth(bbox)  = 0;
502 
    bboxItalic(bbox) = 0;
503 
    bboxSimple(bbox) = 0;
504 
    return bbox;
2 r 505 
}
506 
 
2028 ihaka 507 
static BBOX ShiftBBox(BBOX bbox1, double shiftV)
2 r 508 
{
2028 ihaka 509 
    bboxHeight(bbox1) = bboxHeight(bbox1) + shiftV;
510 
    bboxDepth(bbox1)  = bboxDepth(bbox1) - shiftV;
511 
    bboxWidth(bbox1)  = bboxWidth(bbox1);
512 
    bboxItalic(bbox1) = bboxItalic(bbox1);
513 
    bboxSimple(bbox1) = bboxSimple(bbox1);
514 
    return bbox1;
2 r 515 
}
516 
 
2028 ihaka 517 
static BBOX EnlargeBBox(BBOX bbox, double deltaHeight, double deltaDepth,
518 
		      double deltaWidth)
2 r 519 
{
2028 ihaka 520 
    bboxHeight(bbox) += deltaHeight;
521 
    bboxDepth(bbox)  += deltaDepth;
522 
    bboxWidth(bbox)  += deltaWidth;
523 
    return bbox;
2 r 524 
}
525 
 
2028 ihaka 526 
static BBOX CombineBBoxes(BBOX bbox1, BBOX bbox2)
527 
{
528 
    bboxHeight(bbox1) = max(bboxHeight(bbox1), bboxHeight(bbox2));
529 
    bboxDepth(bbox1)  = max(bboxDepth(bbox1), bboxDepth(bbox2));
530 
    bboxWidth(bbox1)  = bboxWidth(bbox1) + bboxWidth(bbox2);
531 
    bboxItalic(bbox1) = bboxItalic(bbox2);
532 
    bboxSimple(bbox1) = bboxSimple(bbox2);
533 
    return bbox1;
534 
}
535 
 
536 
static BBOX CombineAlignedBBoxes(BBOX bbox1, BBOX bbox2)
537 
{
538 
    bboxHeight(bbox1) = max(bboxHeight(bbox1), bboxHeight(bbox2));
539 
    bboxDepth(bbox1)  = max(bboxDepth(bbox1), bboxDepth(bbox2));
540 
    bboxWidth(bbox1)  = max(bboxWidth(bbox1), bboxWidth(bbox2));
541 
    bboxItalic(bbox1) = 0;
542 
    bboxSimple(bbox1) = 0;
543 
    return bbox1;
544 
}
545 
 
546 
static BBOX CombineOffsetBBoxes(BBOX bbox1, int italic1,
547 
				BBOX bbox2, int italic2,
548 
				double xoffset,
549 
				double yoffset)
550 
{
551 
    double width1 = bboxWidth(bbox1) + (italic1 ? bboxItalic(bbox1) : 0);
552 
    double width2 = bboxWidth(bbox2) + (italic2 ? bboxItalic(bbox2) : 0);
553 
    bboxWidth(bbox1) = max(width1, width2 + xoffset);
554 
    bboxHeight(bbox1) = max(bboxHeight(bbox1), bboxHeight(bbox2) + yoffset);
555 
    bboxDepth(bbox1) = max(bboxDepth(bbox1), bboxDepth(bbox2) - yoffset);
556 
    bboxItalic(bbox1) = 0;
557 
    bboxSimple(bbox1) = 0;
558 
    return bbox1;
559 
}
560 
 
561 
static double CenterShift(BBOX bbox)
562 
{
563 
    return 0.5 * (bboxHeight(bbox) - bboxDepth(bbox));
564 
}
565 
 
3475 pd 566 
#ifdef NOT_used_currently/*-- out 'def'	 (-Wall) --*/
27236 murrell 567 
static BBOX DrawBBox(BBOX bbox, double xoffset, double yoffset,
568 
		     mathContext *mc, R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 569 
{
27236 murrell 570 
    double xsaved = mc->CurrentX;
571 
    double ysaved = mc->CurrentY;
2028 ihaka 572 
    double x[5], y[5];
27236 murrell 573 
    int savedcol = gc->col;
574 
    int savedlty = gc->lty;
575 
    double savedlwd = gc->lwd;
576 
    mc->CurrentX += xoffset;
577 
    mc->CurrentY += yoffset;
578 
    PMoveUp(-bboxDepth(bbox), mc);
579 
    x[4] = x[0] = ConvertedX(mc, dd);
580 
    y[4] = y[0] = ConvertedY(mc, dd);
581 
    PMoveAcross(bboxWidth(bbox), mc);
582 
    x[1] = ConvertedX(mc, dd);
583 
    y[1] = ConvertedY(mc, dd);
584 
    PMoveUp(bboxHeight(bbox) + bboxDepth(bbox), mc);
585 
    x[2] = ConvertedX(mc, dd);
586 
    y[2] = ConvertedY(mc, dd);
587 
    PMoveAcross(-bboxWidth(bbox), mc);
588 
    x[3] = ConvertedX(mc, dd);
589 
    y[3] = ConvertedY(mc, dd);
590 
    gc->col = mc->BoxColor;
591 
    gc->lty = LTY_SOLID;
592 
    gc->lwd = 1;
593 
    GEPolyline(5, x, y, gc, dd);
594 
    PMoveTo(xsaved, ysaved, mc);
595 
    gc->col = savedcol;
596 
    gc->lty = savedlty;
597 
    gc->lwd = savedlwd;
2028 ihaka 598 
    return bbox;
599 
}
2124 maechler 600 
#endif
2028 ihaka 601 
 
602 
typedef struct {
603 
    char *name;
604 
    int code;
605 
} SymTab;
606 
 
607 
/* Determine a match between symbol name and string. */
608 
 
609 
static int NameMatch(SEXP expr, char *aString)
610 
{
6994 pd 611 
    if (!isSymbol(expr)) return 0;
2028 ihaka 612 
    return !strcmp(CHAR(PRINTNAME(expr)), aString);
613 
}
614 
 
615 
static int StringMatch(SEXP expr, char *aString)
616 
{
10172 luke 617 
    return !strcmp(CHAR(STRING_ELT(expr, 0)), aString);
2028 ihaka 618 
}
619 
/* Code to determine the ascii code corresponding */
620 
/* to an element of a mathematical expression. */
621 
 
3475 pd 622 
#define A_HAT		  94
623 
#define A_TILDE		 126
2028 ihaka 624 
 
3475 pd 625 
#define S_SPACE		  32
626 
#define S_PARENLEFT	  40
627 
#define S_PARENRIGHT	  41
628 
#define S_ASTERISKMATH	  42
629 
#define S_COMMA		  44
630 
#define S_SLASH		  47
631 
#define S_RADICALEX	  96
632 
#define S_FRACTION	 164
633 
#define S_ELLIPSIS	 188
634 
#define S_INTERSECTION	 199
635 
#define S_UNION		 200
636 
#define S_PRODUCT	 213
637 
#define S_RADICAL	 214
638 
#define S_SUM		 229
639 
#define S_INTEGRAL	 242
640 
#define S_BRACKETLEFTTP	 233
641 
#define S_BRACKETLEFTBT	 235
2028 ihaka 642 
#define S_BRACKETRIGHTTP 249
643 
#define S_BRACKETRIGHTBT 251
644 
 
3475 pd 645 
#define N_LIM		1001
646 
#define N_LIMINF	1002
647 
#define N_LIMSUP	1003
648 
#define N_INF		1004
649 
#define N_SUP		1005
650 
#define N_MIN		1006
651 
#define N_MAX		1007
2028 ihaka 652 
 
653 
 
654 
/* The Full Adobe Symbol Font */
655 
 
7081 pd 656 
static SymTab
1926 ihaka 657 
SymbolTable[] = {
3865 pd 658 
    { "space",		 32 },
659 
    { "exclam",		 33 },
660 
    { "universal",	 34 },
661 
    { "numbersign",	 35 },
662 
    { "existential",	 36 },
663 
    { "percent",	 37 },
664 
    { "ampersand",	 38 },
665 
    { "suchthat",	 39 },
666 
    { "parenleft",	 40 },
667 
    { "parenright",	 41 },
668 
    { "asteriskmath",	 42 },
669 
    { "plus",		 43 },
670 
    { "comma",		 44 },
671 
    { "minus",		 45 },
672 
    { "period",		 46 },
673 
    { "slash",		 47 },
674 
    { "0",		 48 },
675 
    { "1",		 49 },
676 
    { "2",		 50 },
677 
    { "3",		 51 },
678 
    { "4",		 52 },
679 
    { "5",		 53 },
680 
    { "6",		 54 },
681 
    { "7",		 55 },
682 
    { "8",		 56 },
683 
    { "9",		 57 },
684 
    { "colon",		 58 },
685 
    { "semicolon",	 59 },
686 
    { "less",		 60 },
687 
    { "equal",		 61 },
688 
    { "greater",	 62 },
689 
    { "question",	 63 },
690 
    { "congruent",	 64 },
2028 ihaka 691 
 
7081 pd 692 
    { "Alpha",/* 0101= */65 }, /* Upper Case Greek Characters */
3865 pd 693 
    { "Beta",		 66 },
694 
    { "Chi",		 67 },
695 
    { "Delta",		 68 },
696 
    { "Epsilon",	 69 },
697 
    { "Phi",		 70 },
698 
    { "Gamma",		 71 },
699 
    { "Eta",		 72 },
700 
    { "Iota",		 73 },
701 
    { "theta1",		 74 },
702 
    { "Kappa",		 75 },
703 
    { "Lambda",		 76 },
704 
    { "Mu",		 77 },
705 
    { "Nu",		 78 },
706 
    { "Omicron",	 79 },
707 
    { "Pi",		 80 },
708 
    { "Theta",		 81 },
709 
    { "Rho",		 82 },
710 
    { "Sigma",		 83 },
711 
    { "Tau",		 84 },
712 
    { "Upsilon",	 85 },
713 
    { "sigma1",		 86 },
714 
    { "Omega",		 87 },
715 
    { "Xi",		 88 },
716 
    { "Psi",		 89 },
7081 pd 717 
    { "Zeta",/* 0132 = */90 },
2 r 718 
 
3865 pd 719 
    { "bracketleft",	 91 },	/* Miscellaneous Special Characters */
720 
    { "therefore",	 92 },
721 
    { "bracketright",	 93 },
722 
    { "perpendicular",	 94 },
723 
    { "underscore",	 95 },
724 
    { "radicalex",	 96 },
2028 ihaka 725 
 
7081 pd 726 
    { "alpha",/* 0141= */97 },	/* Lower Case Greek Characters */
3865 pd 727 
    { "beta",		 98 },
728 
    { "chi",		 99 },
729 
    { "delta",		100 },
730 
    { "epsilon",	101 },
731 
    { "phi",		102 },
732 
    { "gamma",		103 },
733 
    { "eta",		104 },
734 
    { "iota",		105 },
735 
    { "phi1",		106 },
736 
    { "kappa",		107 },
737 
    { "lambda",		108 },
738 
    { "mu",		109 },
739 
    { "nu",		110 },
740 
    { "omicron",	111 },
741 
    { "pi",		112 },
742 
    { "theta",		113 },
743 
    { "rho",		114 },
744 
    { "sigma",		115 },
745 
    { "tau",		116 },
746 
    { "upsilon",	117 },
747 
    { "omega1",		118 },
748 
    { "omega",		119 },
749 
    { "xi",		120 },
750 
    { "psi",		121 },
7081 pd 751 
    { "zeta",/* 0172= */122 },
2 r 752 
 
3865 pd 753 
    { "braceleft",	123 },	/* Miscellaneous Special Characters */
754 
    { "bar",		124 },
755 
    { "braceright",	125 },
756 
    { "similar",	126 },
2028 ihaka 757 
 
3865 pd 758 
    { "Upsilon1",	161 },	/* Lone Greek */
759 
    { "minute",		162 },
760 
    { "lessequal",	163 },
761 
    { "fraction",	164 },
762 
    { "infinity",	165 },
763 
    { "florin",		166 },
764 
    { "club",		167 },
765 
    { "diamond",	168 },
766 
    { "heart",		169 },
767 
    { "spade",		170 },
768 
    { "arrowboth",	171 },
769 
    { "arrowleft",	172 },
770 
    { "arrowup",	173 },
771 
    { "arrowright",	174 },
772 
    { "arrowdown",	175 },
773 
    { "degree",		176 },
774 
    { "plusminus",	177 },
775 
    { "second",		178 },
776 
    { "greaterequal",	179 },
777 
    { "multiply",	180 },
778 
    { "proportional",	181 },
779 
    { "partialdiff",	182 },
780 
    { "bullet",		183 },
781 
    { "divide",		184 },
782 
    { "notequal",	185 },
783 
    { "equivalence",	186 },
784 
    { "approxequal",	187 },
785 
    { "ellipsis",	188 },
786 
    { "arrowvertex",	189 },
787 
    { "arrowhorizex",	190 },
788 
    { "carriagereturn", 191 },
789 
    { "aleph",		192 },
790 
    { "Ifraktur",	193 },
791 
    { "Rfraktur",	194 },
792 
    { "weierstrass",	195 },
793 
    { "circlemultiply", 196 },
794 
    { "circleplus",	197 },
795 
    { "emptyset",	198 },
7081 pd 796 
    { "intersection",	199 },/* = 0307 */
797 
    { "union",		200 },/* = 0310 */
3865 pd 798 
    { "propersuperset", 201 },
799 
    { "reflexsuperset", 202 },
800 
    { "notsubset",	203 },
801 
    { "propersubset",	204 },
802 
    { "reflexsubset",	205 },
803 
    { "element",	206 },
804 
    { "notelement",	207 },
805 
    { "angle",		208 },
806 
    { "gradient",	209 },
807 
    { "registerserif",	210 },
808 
    { "copyrightserif", 211 },
809 
    { "trademarkserif", 212 },
810 
    { "product",	213 },
811 
    { "radical",	214 },
812 
    { "dotmath",	215 },
813 
    { "logicaland",	217 },
814 
    { "logicalor",	218 },
815 
    { "arrowdblboth",	219 },
816 
    { "arrowdblleft",	220 },
817 
    { "arrowdblup",	221 },
818 
    { "arrowdblright",	222 },
819 
    { "arrowdbldown",	223 },
820 
    { "lozenge",	224 },
821 
    { "angleleft",	225 },
822 
    { "registersans",	226 },
823 
    { "copyrightsans",	227 },
824 
    { "trademarksans",	228 },
825 
    { "summation",	229 },
826 
    { "parenlefttp",	230 },
827 
    { "parenleftex",	231 },
828 
    { "parenleftbt",	232 },
829 
    { "bracketlefttp",	233 },
830 
    { "bracketleftex",	234 },
831 
    { "bracketleftbt",	235 },
832 
    { "bracelefttp",	236 },
833 
    { "braceleftmid",	237 },
834 
    { "braceleftbt",	238 },
835 
    { "braceex",	239 },
836 
    { "angleright",	241 },
837 
    { "integral",	242 },
838 
    { "integraltp",	243 },
839 
    { "integralex",	244 },
840 
    { "integralbt",	245 },
841 
    { "parenrighttp",	246 },
842 
    { "parenrightex",	247 },
843 
    { "parenrightbt",	248 },
844 
    { "bracketrighttp", 249 },
845 
    { "bracketrightex", 250 },
846 
    { "bracketrightbt", 251 },
847 
    { "bracerighttp",	252 },
848 
    { "bracerightmid",	253 },
849 
    { "bracerightbt",	254 },
2 r 850 
 
3865 pd 851 
    { NULL,		  0 },
2 r 852 
};
853 
 
2028 ihaka 854 
static int SymbolCode(SEXP expr)
2 r 855 
{
1839 ihaka 856 
    int i;
1926 ihaka 857 
    for (i = 0; SymbolTable[i].code; i++)
2028 ihaka 858 
	if (NameMatch(expr, SymbolTable[i].name))
1926 ihaka 859 
	    return SymbolTable[i].code;
1839 ihaka 860 
    return 0;
861 
}
2 r 862 
 
2028 ihaka 863 
static int TranslatedSymbol(SEXP expr)
1839 ihaka 864 
{
2028 ihaka 865 
    int code = SymbolCode(expr);
3475 pd 866 
    if ((0101 <= code && code <= 0132)	||   /* Greek */
867 
	(0141 <= code && code <= 0172)	||   /* Greek */
7081 pd 868 
	code == 0241			||   /* Upsilon1 */
3475 pd 869 
	code == 0242			||   /* minute */
870 
	code == 0245			||   /* infinity */
871 
	code == 0260			||   /* degree */
872 
	code == 0262			||   /* second */
19598 ripley 873 
	code == 0266                    ||   /* partialdiff */
2028 ihaka 874 
	0)
875 
	return code;
876 
    else
877 
	return 0;
2 r 878 
}
879 
 
1839 ihaka 880 
/* Code to determine the nature of an expression. */
2 r 881 
 
2028 ihaka 882 
static int FormulaExpression(SEXP expr)
2 r 883 
{
1839 ihaka 884 
    return (TYPEOF(expr) == LANGSXP);
2 r 885 
}
886 
 
2028 ihaka 887 
static int NameAtom(SEXP expr)
2 r 888 
{
1839 ihaka 889 
    return (TYPEOF(expr) == SYMSXP);
2 r 890 
}
891 
 
2028 ihaka 892 
static int NumberAtom(SEXP expr)
2 r 893 
{
1839 ihaka 894 
    return ((TYPEOF(expr) == REALSXP) ||
895 
	    (TYPEOF(expr) == INTSXP)  ||
896 
	    (TYPEOF(expr) == CPLXSXP));
2 r 897 
}
898 
 
2028 ihaka 899 
static int StringAtom(SEXP expr)
2 r 900 
{
1839 ihaka 901 
    return (TYPEOF(expr) == STRSXP);
2 r 902 
}
903 
 
3475 pd 904 
#ifdef NOT_used_currently/*-- out 'def'	 (-Wall) --*/
2028 ihaka 905 
static int symbolAtom(SEXP expr)
1926 ihaka 906 
{
907 
    int i;
2028 ihaka 908 
    if (NameAtom(expr)) {
909 
	for (i = 0; SymbolTable[i].code; i++)
910 
	    if (NameMatch(expr, SymbolTable[i].name))
911 
		return 1;
912 
    }
1926 ihaka 913 
    return 0;
2 r 914 
}
2124 maechler 915 
#endif
2028 ihaka 916 
/* Code to determine a font from the */
917 
/* nature of the expression */
2 r 918 
 
3475 pd 919 
#ifdef NOT_used_currently/*-- out 'def'	 (-Wall) --*/
27236 murrell 920 
static FontType mc->CurrentFont = 3;
2124 maechler 921 
#endif
27236 murrell 922 
static FontType GetFont(R_GE_gcontext *gc)
2 r 923 
{
27236 murrell 924 
    return gc->fontface;
2 r 925 
}
926 
 
27236 murrell 927 
static FontType SetFont(FontType font, R_GE_gcontext *gc)
2 r 928 
{
27236 murrell 929 
    FontType prevfont = gc->fontface;
930 
    gc->fontface = font;
2028 ihaka 931 
    return prevfont;
2 r 932 
}
933 
 
27236 murrell 934 
static int UsingItalics(R_GE_gcontext *gc)
2 r 935 
{
27236 murrell 936 
    return (gc->fontface == ItalicFont ||
937 
	    gc->fontface == BoldItalicFont);
2 r 938 
}
939 
 
27236 murrell 940 
static BBOX GlyphBBox(int chr, R_GE_gcontext *gc, GEDevDesc *dd)
2 r 941 
{
2028 ihaka 942 
    BBOX bbox;
943 
    double height, depth, width;
27236 murrell 944 
    GEMetricInfo(chr, gc,
945 
		&height, &depth, &width, dd);
946 
    bboxHeight(bbox) = fromDeviceHeight(height, MetricUnit, dd);
947 
    bboxDepth(bbox)  = fromDeviceHeight(depth, MetricUnit, dd);
948 
    bboxWidth(bbox)  = fromDeviceHeight(width, MetricUnit, dd);
2028 ihaka 949 
    bboxItalic(bbox) = 0;
950 
    bboxSimple(bbox) = 1;
951 
    return bbox;
2 r 952 
}
953 
 
27236 murrell 954 
static BBOX RenderElement(SEXP, int,
955 
			  mathContext*, R_GE_gcontext*, GEDevDesc*);
956 
static BBOX RenderOffsetElement(SEXP, double, double, int,
957 
				mathContext*, R_GE_gcontext*, GEDevDesc*);
958 
static BBOX RenderExpression(SEXP, int,
959 
			     mathContext*, R_GE_gcontext*, GEDevDesc*);
32392 ripley 960 
static BBOX RenderSymbolChar(int, int,
27236 murrell 961 
			     mathContext*, R_GE_gcontext*, GEDevDesc*);
2 r 962 
 
963 
 
3475 pd 964 
/*  Code to Generate Bounding Boxes and Draw Formulae.	*/
2 r 965 
 
32392 ripley 966 
static BBOX RenderItalicCorr(BBOX bbox, int draw, mathContext *mc,
967 
			     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 968 
{
2028 ihaka 969 
    if (bboxItalic(bbox) > 0) {
970 
	if (draw)
27236 murrell 971 
	    PMoveAcross(bboxItalic(bbox), mc);
2028 ihaka 972 
	bboxWidth(bbox) += bboxItalic(bbox);
973 
	bboxItalic(bbox) = 0;
974 
    }
975 
    return bbox;
2 r 976 
}
977 
 
32392 ripley 978 
static BBOX RenderGap(double gap, int draw, mathContext *mc,
979 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 980 
{
2028 ihaka 981 
    if (draw)
27236 murrell 982 
	PMoveAcross(gap, mc);
2028 ihaka 983 
    return MakeBBox(0, 0, gap);
2 r 984 
}
985 
 
2028 ihaka 986 
/* Draw a Symbol from the Special Font */
2 r 987 
 
32392 ripley 988 
static BBOX RenderSymbolChar(int ascii, int draw, mathContext *mc,
989 
			     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 990 
{
2028 ihaka 991 
    FontType prev;
992 
    BBOX bbox;
993 
    char asciiStr[2];
994 
    if (ascii == A_HAT || ascii == A_TILDE)
27236 murrell 995 
	prev = SetFont(PlainFont, gc);
2028 ihaka 996 
    else
27236 murrell 997 
	prev = SetFont(SymbolFont, gc);
998 
    bbox = GlyphBBox(ascii, gc, dd);
2028 ihaka 999 
    if (draw) {
32397 ripley 1000 
	/* <UTF8-FIXME> */
2028 ihaka 1001 
	asciiStr[0] = ascii;
1002 
	asciiStr[1] = '\0';
32392 ripley 1003 
	GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), asciiStr,
27236 murrell 1004 
	       0.0, 0.0, mc->CurrentAngle, gc,
1005 
	       dd);
1006 
	PMoveAcross(bboxWidth(bbox), mc);
2028 ihaka 1007 
    }
27236 murrell 1008 
    SetFont(prev, gc);
2028 ihaka 1009 
    return bbox;
2 r 1010 
}
1011 
 
2028 ihaka 1012 
/* Draw a Symbol String in "Math Mode */
1013 
/* This code inserts italic corrections after */
1014 
/* every character. */
2 r 1015 
 
32392 ripley 1016 
static BBOX RenderSymbolStr(char *str, int draw, mathContext *mc,
1017 
			    R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1018 
{
2028 ihaka 1019 
    char chr[2];
1020 
    BBOX glyphBBox;
1021 
    BBOX resultBBox = NullBBox();
1022 
    double lastItalicCorr = 0;
27236 murrell 1023 
    FontType prevfont = GetFont(gc);
2028 ihaka 1024 
    FontType font = prevfont;
1025 
    chr[1] = '\0';
1026 
    if (str) {
32397 ripley 1027 
	/* <UTF8-FIXME> perhaps */
2028 ihaka 1028 
	char *s = str;
1029 
	while (*s) {
6098 pd 1030 
	    if (isdigit((int)*s) && font != PlainFont) {
2028 ihaka 1031 
		font = PlainFont;
27236 murrell 1032 
		SetFont(PlainFont, gc);
2028 ihaka 1033 
	    }
1034 
	    else if (font != prevfont) {
1035 
		font = prevfont;
27236 murrell 1036 
		SetFont(prevfont, gc);
2028 ihaka 1037 
	    }
27236 murrell 1038 
	    glyphBBox = GlyphBBox(*s, gc, dd);
1039 
	    if (UsingItalics(gc))
2028 ihaka 1040 
		bboxItalic(glyphBBox) = ItalicFactor * bboxHeight(glyphBBox);
1041 
	    else
1042 
		bboxItalic(glyphBBox) = 0;
1043 
	    if (draw) {
1044 
		chr[0] = *s;
27236 murrell 1045 
		PMoveAcross(lastItalicCorr, mc);
1046 
		GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), chr,
1047 
		       0.0, 0.0, mc->CurrentAngle, gc,
1048 
		       dd);
1049 
		PMoveAcross(bboxWidth(glyphBBox), mc);
2028 ihaka 1050 
	    }
1051 
	    bboxWidth(resultBBox) += lastItalicCorr;
1052 
	    resultBBox = CombineBBoxes(resultBBox, glyphBBox);
1053 
	    lastItalicCorr = bboxItalic(glyphBBox);
1054 
	    s++;
1055 
	}
1056 
	if (font != prevfont)
27236 murrell 1057 
	    SetFont(prevfont, gc);
2028 ihaka 1058 
    }
1059 
    bboxSimple(resultBBox) = 1;
1060 
    return resultBBox;
2 r 1061 
}
1062 
 
2028 ihaka 1063 
/* Code for Character String Atoms. */
2 r 1064 
 
32397 ripley 1065 
/* This only gets called from RenderAccent */
32392 ripley 1066 
static BBOX RenderChar(int ascii, int draw, mathContext *mc,
1067 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1068 
{
2028 ihaka 1069 
    BBOX bbox;
1070 
    char asciiStr[2];
27236 murrell 1071 
    bbox = GlyphBBox(ascii, gc, dd);
2028 ihaka 1072 
    if (draw) {
32397 ripley 1073 
	/* <UTF8-FIXME> This appears only to get called with values
1074 
	   for hat, tilde and ring.  The latter appears to be hardcoded
1075 
	   in Latin-1.
1076 
	 */
2028 ihaka 1077 
	asciiStr[0] = ascii;
1078 
	asciiStr[1] = '\0';
27236 murrell 1079 
	GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), asciiStr,
1080 
	       0.0, 0.0, mc->CurrentAngle, gc,
1081 
	       dd);
1082 
	PMoveAcross(bboxWidth(bbox), mc);
2028 ihaka 1083 
    }
1084 
    return bbox;
2 r 1085 
}
1086 
 
32397 ripley 1087 
/* This gets called on strings and PRINTNAMES */
32392 ripley 1088 
static BBOX RenderStr(char *str, int draw, mathContext *mc,
1089 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1090 
{
2028 ihaka 1091 
    BBOX glyphBBox;
1092 
    BBOX resultBBox = NullBBox();
1093 
    if (str) {
32624 ripley 1094 
#ifdef SUPPORT_MBCS
32397 ripley 1095 
	int n = strlen(str), used;
1096 
	wchar_t wc;
1097 
	char *p = str;
32639 ripley 1098 
	mbstate_t mb_st;
1099 
	mbs_init(&mb_st);
32720 ripley 1100 
	while ((used = Mbrtowc(&wc, p, n, &mb_st)) > 0) {
32397 ripley 1101 
	    glyphBBox = GlyphBBox(wc, gc, dd);
1102 
	    resultBBox = CombineBBoxes(resultBBox, glyphBBox);
1103 
	    p += used; n -= used;
1104 
	}
1105 
#else
2028 ihaka 1106 
	char *s = str;
1107 
	while (*s) {
27236 murrell 1108 
	    glyphBBox = GlyphBBox(*s, gc, dd);
2028 ihaka 1109 
	    resultBBox = CombineBBoxes(resultBBox, glyphBBox);
1110 
	    s++;
1111 
	}
32397 ripley 1112 
#endif
2028 ihaka 1113 
	if (draw) {
27236 murrell 1114 
	    GEText(ConvertedX(mc ,dd), ConvertedY(mc, dd), str,
1115 
		   0.0, 0.0, mc->CurrentAngle, gc,
1116 
		   dd);
1117 
	    PMoveAcross(bboxWidth(resultBBox), mc);
2028 ihaka 1118 
	}
27236 murrell 1119 
	if (UsingItalics(gc))
2028 ihaka 1120 
	    bboxItalic(resultBBox) = ItalicFactor * bboxHeight(glyphBBox);
1121 
	else
1122 
	    bboxItalic(resultBBox) = 0;
1123 
    }
1124 
    bboxSimple(resultBBox) = 1;
1125 
    return resultBBox;
2 r 1126 
}
1127 
 
1128 
 
2028 ihaka 1129 
/* Code for Symbol Font Atoms */
2 r 1130 
 
32392 ripley 1131 
static BBOX RenderSymbol(SEXP expr, int draw, mathContext *mc,
1132 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1133 
{
2028 ihaka 1134 
    int code;
2124 maechler 1135 
    if ((code = TranslatedSymbol(expr)))
27236 murrell 1136 
	return RenderSymbolChar(code, draw, mc, gc, dd);
2028 ihaka 1137 
    else
27236 murrell 1138 
	return RenderSymbolStr(CHAR(PRINTNAME(expr)), draw, mc, gc, dd);
2 r 1139 
}
1140 
 
32392 ripley 1141 
static BBOX RenderSymbolString(SEXP expr, int draw, mathContext *mc,
1142 
			       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1143 
{
2028 ihaka 1144 
    int code;
2124 maechler 1145 
    if ((code = TranslatedSymbol(expr)))
27236 murrell 1146 
	return RenderSymbolChar(code, draw, mc, gc, dd);
2028 ihaka 1147 
    else
27236 murrell 1148 
	return RenderStr(CHAR(PRINTNAME(expr)), draw, mc, gc, dd);
2 r 1149 
}
1150 
 
1151 
 
2028 ihaka 1152 
/* Code for Numeric Atoms */
2 r 1153 
 
32392 ripley 1154 
static BBOX RenderNumber(SEXP expr, int draw, mathContext *mc,
1155 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1156 
{
2028 ihaka 1157 
    BBOX bbox;
27236 murrell 1158 
    FontType prevfont = SetFont(PlainFont, gc);
1159 
    bbox = RenderStr(CHAR(asChar(expr)), draw, mc, gc, dd);
1160 
    SetFont(prevfont, gc);
2028 ihaka 1161 
    return bbox;
2 r 1162 
}
1163 
 
2028 ihaka 1164 
/* Code for String Atoms */
2 r 1165 
 
32392 ripley 1166 
static BBOX RenderString(SEXP expr, int draw, mathContext *mc,
1167 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1168 
{
27236 murrell 1169 
    return RenderStr(CHAR(STRING_ELT(expr, 0)), draw, mc, gc, dd);
2 r 1170 
}
1171 
 
2028 ihaka 1172 
/* Code for Ellipsis (ldots, cdots, ...) */
2 r 1173 
 
2028 ihaka 1174 
static int DotsAtom(SEXP expr)
2 r 1175 
{
2028 ihaka 1176 
    if (NameMatch(expr, "cdots") ||
3475 pd 1177 
	NameMatch(expr, "...")	 ||
2028 ihaka 1178 
	NameMatch(expr, "ldots"))
3475 pd 1179 
	    return 1;
2028 ihaka 1180 
    return 0;
2 r 1181 
}
1182 
 
32392 ripley 1183 
static BBOX RenderDots(SEXP expr, int draw, mathContext *mc,
1184 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1185 
{
27236 murrell 1186 
    BBOX bbox = RenderSymbolChar(S_ELLIPSIS, 0, mc, gc, dd);
2028 ihaka 1187 
    if (NameMatch(expr, "cdots") || NameMatch(expr, "...")) {
27236 murrell 1188 
	double shift = AxisHeight(gc, dd) - 0.5 * bboxHeight(bbox);
2028 ihaka 1189 
	if (draw) {
27236 murrell 1190 
	    PMoveUp(shift, mc);
1191 
	    RenderSymbolChar(S_ELLIPSIS, 1, mc, gc, dd);
1192 
	    PMoveUp(-shift, mc);
2028 ihaka 1193 
	}
1194 
	return ShiftBBox(bbox, shift);
1195 
    }
1196 
    else {
1197 
	if (draw)
27236 murrell 1198 
	    RenderSymbolChar(S_ELLIPSIS, 1, mc, gc, dd);
2028 ihaka 1199 
	return bbox;
1200 
    }
2 r 1201 
}
1202 
 
2028 ihaka 1203 
/*----------------------------------------------------------------------
1204 
 *
1205 
 *  Code for Atoms
1206 
 *
1207 
 */
2 r 1208 
 
32392 ripley 1209 
static BBOX RenderAtom(SEXP expr, int draw, mathContext *mc,
1210 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1211 
{
2028 ihaka 1212 
    if (NameAtom(expr)) {
1213 
	if (DotsAtom(expr))
27236 murrell 1214 
	    return RenderDots(expr, draw, mc, gc, dd);
2028 ihaka 1215 
	else
27236 murrell 1216 
	    return RenderSymbol(expr, draw, mc, gc, dd);
2028 ihaka 1217 
    }
1218 
    else if (NumberAtom(expr))
27236 murrell 1219 
	return RenderNumber(expr, draw, mc, gc, dd);
2028 ihaka 1220 
    else if (StringAtom(expr))
27236 murrell 1221 
	return RenderString(expr, draw, mc, gc, dd);
3865 pd 1222 
 
1223 
    return NullBBox();		/* -Wall */
2 r 1224 
}
1225 
 
1226 
 
2028 ihaka 1227 
/*----------------------------------------------------------------------
1228 
 *
1229 
 *  Code for Binary / Unary Operators  (~, +, -, ... )
1230 
 *
1231 
 *  Note that there are unary and binary ~ s.
1232 
 *
1233 
 */
2 r 1234 
 
2028 ihaka 1235 
static int SpaceAtom(SEXP expr)
2 r 1236 
{
2028 ihaka 1237 
    return NameAtom(expr) && NameMatch(expr, "~");
2 r 1238 
}
1239 
 
1240 
 
32392 ripley 1241 
static BBOX RenderSpace(SEXP expr, int draw, mathContext *mc,
1242 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1243 
{
2124 maechler 1244 
 
2028 ihaka 1245 
    BBOX opBBox, arg1BBox, arg2BBox;
1246 
    int nexpr = length(expr);
2 r 1247 
 
2028 ihaka 1248 
    if (nexpr == 2) {
27236 murrell 1249 
	opBBox = RenderSymbolChar(' ', draw, mc, gc, dd);
1250 
	arg1BBox = RenderElement(CADR(expr), draw, mc, gc, dd);
2028 ihaka 1251 
	return CombineBBoxes(opBBox, arg1BBox);
1252 
    }
1253 
    else if (nexpr == 3) {
27236 murrell 1254 
	arg1BBox = RenderElement(CADR(expr), draw, mc, gc, dd);
1255 
	opBBox = RenderSymbolChar(' ', draw, mc, gc, dd);
1256 
	arg2BBox = RenderElement(CADDR(expr), draw, mc, gc, dd);
2028 ihaka 1257 
	opBBox = CombineBBoxes(arg1BBox, opBBox);
1258 
	opBBox = CombineBBoxes(opBBox, arg2BBox);
1259 
	return opBBox;
1260 
    }
1839 ihaka 1261 
    else
32871 ripley 1262 
	error(_("invalid mathematical annotation"));
3865 pd 1263 
 
1264 
    return NullBBox();		/* -Wall */
2 r 1265 
}
1266 
 
2028 ihaka 1267 
static SymTab BinTable[] = {
3865 pd 1268 
    { "*",		 052 },	/* Binary Operators */
1269 
    { "+",		 053 },
1270 
    { "-",		 055 },
1271 
    { "/",		 057 },
1272 
    { ":",		 072 },
1273 
    { "%+-%",		0261 },
1274 
    { "%*%",		0264 },
1275 
    { "%/%",		0270 },
1276 
    { "%intersection%", 0307 },
1277 
    { "%union%",	0310 },
1278 
    { NULL,		   0 }
2028 ihaka 1279 
};
2 r 1280 
 
2028 ihaka 1281 
static int BinAtom(SEXP expr)
2 r 1282 
{
2028 ihaka 1283 
    int i;
7081 pd 1284 
 
2028 ihaka 1285 
    for (i = 0; BinTable[i].code; i++)
1286 
	if (NameMatch(expr, BinTable[i].name))
1287 
	    return BinTable[i].code;
1288 
    return 0;
2 r 1289 
}
1290 
 
2028 ihaka 1291 
#define SLASH2
2 r 1292 
 
32392 ripley 1293 
static BBOX RenderSlash(int draw, mathContext *mc, R_GE_gcontext *gc,
1294 
			GEDevDesc *dd)
2 r 1295 
{
2028 ihaka 1296 
#ifdef SLASH0
1297 
    /* The Default Font Character */
27236 murrell 1298 
    return RenderSymbolChar(S_SLASH, draw, mc, gc, dd);
2 r 1299 
#endif
2028 ihaka 1300 
#ifdef SLASH1
1301 
    /* Symbol Magnify Version */
27236 murrell 1302 
    double savecex = gc->cex;
2028 ihaka 1303 
    BBOX bbox;
1304 
    double height1, height2;
27236 murrell 1305 
    height1 = bboxHeight(RenderSymbolChar(S_SLASH, 0), mc, gc, dd);
1306 
    gc->cex = 1.2 * gc->cex;
1307 
    height2 = bboxHeight(RenderSymbolChar(S_SLASH, 0), mc, gc, dd);
2028 ihaka 1308 
    if (draw)
27236 murrell 1309 
	PMoveUp(- 0.5 * (height2 - height1), mc);
1310 
    bbox = RenderSymbolChar(S_SLASH, draw, mc, gc, dd);
2028 ihaka 1311 
    if (draw)
27236 murrell 1312 
	PMoveUp(0.5 * (height2 - height1), mc);
1313 
    gc->cex = savecex;
2028 ihaka 1314 
    return bbox;
2 r 1315 
#endif
2028 ihaka 1316 
#ifdef SLASH2
1317 
    /* Line Drawing Version */
1318 
    double x[2], y[2];
27236 murrell 1319 
    double depth = 0.5 * TeX(sigma22, gc, dd);
1320 
    double height = XHeight(gc, dd) + 0.5 * TeX(sigma22, gc, dd);
1321 
    double width = 0.5 * xHeight(gc, dd);
2028 ihaka 1322 
    if (draw) {
27236 murrell 1323 
	int savedlty = gc->lty;
1324 
	double savedlwd = gc->lwd;
1325 
	PMoveAcross(0.5 * width, mc);
1326 
	PMoveUp(-depth, mc);
1327 
	x[0] = ConvertedX(mc, dd);
1328 
	y[0] = ConvertedY(mc, dd);
1329 
	PMoveAcross(width, mc);
1330 
	PMoveUp(depth + height, mc);
1331 
	x[1] = ConvertedX(mc, dd);
1332 
	y[1] = ConvertedY(mc, dd);
1333 
	PMoveUp(-height, mc);
1334 
	gc->lty = LTY_SOLID;
1335 
	gc->lwd = 1;
1336 
	GEPolyline(2, x, y, gc, dd);
1337 
	PMoveAcross(0.5 * width, mc);
1338 
	gc->lty = savedlty;
1339 
	gc->lwd = savedlwd;
2028 ihaka 1340 
    }
1341 
    return MakeBBox(height, depth, 2 * width);
2 r 1342 
#endif
2028 ihaka 1343 
#ifdef SLASH3
1344 
    /* Offset Overprinting - A Failure! */
27236 murrell 1345 
    BBOX slashBBox = RenderSymbolChar(S_SLASH, 0, mc, gc, dd);
2028 ihaka 1346 
    BBOX ansBBox;
1347 
    double height = bboxHeight(slashBBox);
1348 
    double depth = bboxDepth(slashBBox);
1349 
    double width = bboxWidth(slashBBox);
1350 
    double slope = (height + depth) / slope;
27236 murrell 1351 
    double delta = TeX(sigma22, gc, dd);
2028 ihaka 1352 
    if (draw)
27236 murrell 1353 
	PMoveUp(-delta, mc);
1354 
    ansBBox = ShiftBBox(RenderSymbolChar(S_SLASH, draw), -delta, mc, gc, dd);
1355 
    PMoveUp(2 * delta, mc);
32392 ripley 1356 
    ansBBox = CombineBBoxes(ansBBox, RenderGap(2 * delta / slope, draw,
1357 
					       mc, gc, dd));
1358 
    ansBBox = ShiftBBox(RenderSymbolChar(S_SLASH, draw), 2 * delta,
1359 
			mc, gc, dd);
27236 murrell 1360 
    PMoveUp(-delta, mc);
2028 ihaka 1361 
    return ansBBox;
2 r 1362 
#endif
1363 
}
1364 
 
32392 ripley 1365 
static BBOX RenderBin(SEXP expr, int draw, mathContext *mc,
1366 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1367 
{
2028 ihaka 1368 
    int op = BinAtom(CAR(expr));
1369 
    int nexpr = length(expr);
1370 
    BBOX bbox;
1371 
    double gap;
2 r 1372 
 
2028 ihaka 1373 
    if(nexpr == 3) {
1374 
	if (op == S_ASTERISKMATH) {
27236 murrell 1375 
	    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1376 
	    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
32392 ripley 1377 
	    return CombineBBoxes(bbox, RenderElement(CADDR(expr), draw,
1378 
						     mc, gc, dd));
2028 ihaka 1379 
	}
1380 
	else if (op == S_SLASH) {
1381 
	    gap = 0;
27236 murrell 1382 
	    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1383 
	    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
1384 
	    bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
1385 
	    bbox = CombineBBoxes(bbox, RenderSlash(draw, mc, gc, dd));
1386 
	    bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
32392 ripley 1387 
	    return CombineBBoxes(bbox, RenderElement(CADDR(expr), draw,
1388 
						     mc, gc, dd));
2028 ihaka 1389 
	}
1390 
	else {
27236 murrell 1391 
	    gap = (mc->CurrentStyle > STYLE_S) ? MediumSpace(gc, dd) : 0;
1392 
	    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1393 
	    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
1394 
	    bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
1395 
	    bbox = CombineBBoxes(bbox, RenderSymbolChar(op, draw, mc, gc, dd));
1396 
	    bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
32392 ripley 1397 
	    return CombineBBoxes(bbox, RenderElement(CADDR(expr), draw,
1398 
						     mc, gc, dd));
2028 ihaka 1399 
	}
1839 ihaka 1400 
    }
2028 ihaka 1401 
    else if(nexpr == 2) {
27236 murrell 1402 
	gap = (mc->CurrentStyle > STYLE_S) ? ThinSpace(gc, dd) : 0;
1403 
	bbox = RenderSymbolChar(op, draw, mc, gc, dd);
1404 
	bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
32392 ripley 1405 
	return CombineBBoxes(bbox, RenderElement(CADR(expr), draw, mc,
1406 
						 gc, dd));
1839 ihaka 1407 
    }
3865 pd 1408 
    else
32871 ripley 1409 
	error(_("invalid mathematical annotation"));
3865 pd 1410 
 
1411 
    return NullBBox();		/* -Wall */
1412 
 
2 r 1413 
}
1414 
 
1415 
 
2028 ihaka 1416 
/*----------------------------------------------------------------------
1417 
 *
1418 
 *  Code for Subscript and Superscipt Expressions
1419 
 *
1420 
 *  Rules 18, 18a, ..., 18f of the TeXBook.
1421 
 *
1422 
 */
2 r 1423 
 
2028 ihaka 1424 
static int SuperAtom(SEXP expr)
2 r 1425 
{
2028 ihaka 1426 
    return NameAtom(expr) && NameMatch(expr, "^");
2 r 1427 
}
1428 
 
2028 ihaka 1429 
static int SubAtom(SEXP expr)
2 r 1430 
{
2028 ihaka 1431 
    return NameAtom(expr) && NameMatch(expr, "[");
2 r 1432 
}
1433 
 
2028 ihaka 1434 
/* Note : If all computations are correct */
1435 
/* We do not need to save and restore the */
1436 
/* current location here.  This is paranoia. */
32392 ripley 1437 
static BBOX RenderSub(SEXP expr, int draw, mathContext *mc,
1438 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1439 
{
2028 ihaka 1440 
    BBOX bodyBBox, subBBox;
1441 
    SEXP body = CADR(expr);
1442 
    SEXP sub = CADDR(expr);
27236 murrell 1443 
    STYLE style = GetStyle(mc);
1444 
    double savedX = mc->CurrentX;
1445 
    double savedY = mc->CurrentY;
2124 maechler 1446 
    double v, s5, s16;
27236 murrell 1447 
    bodyBBox = RenderElement(body, draw, mc, gc, dd);
1448 
    bodyBBox = RenderItalicCorr(bodyBBox, draw, mc, gc, dd);
1449 
    v = bboxSimple(bodyBBox) ? 0 : bboxDepth(bodyBBox) + TeX(sigma19, gc, dd);
1450 
    s5 = TeX(sigma5, gc, dd);
1451 
    s16 = TeX(sigma16, gc, dd);
1452 
    SetSubStyle(style, mc, gc);
1453 
    subBBox = RenderElement(sub, 0, mc, gc, dd);
2028 ihaka 1454 
    v = max(max(v, s16), bboxHeight(subBBox) - 0.8 * sigma5);
27236 murrell 1455 
    subBBox = RenderOffsetElement(sub, 0, -v, draw, mc, gc, dd);
2028 ihaka 1456 
    bodyBBox = CombineBBoxes(bodyBBox, subBBox);
27236 murrell 1457 
    SetStyle(style, mc, gc);
2028 ihaka 1458 
    if (draw)
27236 murrell 1459 
	PMoveTo(savedX + bboxWidth(bodyBBox), savedY, mc);
2028 ihaka 1460 
    return bodyBBox;
2 r 1461 
}
1462 
 
32392 ripley 1463 
static BBOX RenderSup(SEXP expr, int draw, mathContext *mc,
1464 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1465 
{
2028 ihaka 1466 
    BBOX bodyBBox, subBBox, supBBox;
1467 
    SEXP body = CADR(expr);
1468 
    SEXP sup = CADDR(expr);
3865 pd 1469 
    SEXP sub = R_NilValue;	/* -Wall */
27236 murrell 1470 
    STYLE style = GetStyle(mc);
1471 
    double savedX = mc->CurrentX;
1472 
    double savedY = mc->CurrentY;
2028 ihaka 1473 
    double theta, delta, width;
1474 
    double u, p;
1475 
    double v, s5, s17;
1476 
    int haveSub;
1477 
    if (FormulaExpression(body) && SubAtom(CAR(body))) {
1478 
	sub = CADDR(body);
1479 
	body = CADR(body);
1480 
	haveSub = 1;
1481 
    }
1482 
    else haveSub = 0;
27236 murrell 1483 
    bodyBBox = RenderElement(body, draw, mc, gc, dd);
2028 ihaka 1484 
    delta = bboxItalic(bodyBBox);
27236 murrell 1485 
    bodyBBox = RenderItalicCorr(bodyBBox, draw, mc, gc, dd);
2028 ihaka 1486 
    width = bboxWidth(bodyBBox);
1487 
    if (bboxSimple(bodyBBox)) {
1488 
	u = 0;
1489 
	v = 0;
1490 
    }
1491 
    else {
27236 murrell 1492 
	u = bboxHeight(bodyBBox) - TeX(sigma18, gc, dd);
1493 
	v = bboxDepth(bodyBBox) + TeX(sigma19, gc, dd);
2028 ihaka 1494 
    }
27236 murrell 1495 
    theta = TeX(xi8, gc, dd);
1496 
    s5 = TeX(sigma5, gc, dd);
1497 
    s17 = TeX(sigma17, gc, dd);
2028 ihaka 1498 
    if (style == STYLE_D)
27236 murrell 1499 
	p = TeX(sigma13, gc, dd);
1500 
    else if (IsCompactStyle(style, mc, gc))
1501 
	p = TeX(sigma15, gc, dd);
1839 ihaka 1502 
    else
27236 murrell 1503 
	p = TeX(sigma14, gc, dd);
1504 
    SetSupStyle(style, mc, gc);
1505 
    supBBox = RenderElement(sup, 0, mc, gc, dd);
2028 ihaka 1506 
    u = max(max(u, p), bboxDepth(supBBox) + 0.25 * s5);
2 r 1507 
 
2028 ihaka 1508 
    if (haveSub) {
27236 murrell 1509 
	SetSubStyle(style, mc, gc);
1510 
	subBBox = RenderElement(sub, 0, mc, gc, dd);
2028 ihaka 1511 
	v = max(v, s17);
1512 
	if ((u - bboxDepth(supBBox)) - (bboxHeight(subBBox) - v) < 4 * theta) {
1513 
	    double psi = 0.8 * s5 - (u - bboxDepth(supBBox));
1514 
	    if (psi > 0) {
1515 
		u += psi;
1516 
		v -= psi;
1517 
	    }
1518 
	}
1519 
	if (draw)
27236 murrell 1520 
	    PMoveTo(savedX, savedY, mc);
1521 
	subBBox = RenderOffsetElement(sub, width, -v, draw, mc, gc, dd);
2028 ihaka 1522 
	if (draw)
27236 murrell 1523 
	    PMoveTo(savedX, savedY, mc);
1524 
	SetSupStyle(style, mc, gc);
1525 
	supBBox = RenderOffsetElement(sup, width + delta, u, draw, mc, gc, dd);
2028 ihaka 1526 
	bodyBBox = CombineAlignedBBoxes(bodyBBox, subBBox);
1527 
	bodyBBox = CombineAlignedBBoxes(bodyBBox, supBBox);
1528 
    }
1529 
    else {
27236 murrell 1530 
	supBBox = RenderOffsetElement(sup, 0, u, draw, mc, gc, dd);
2028 ihaka 1531 
	bodyBBox = CombineBBoxes(bodyBBox, supBBox);
1532 
    }
1533 
    if (draw)
27236 murrell 1534 
	PMoveTo(savedX + bboxWidth(bodyBBox), savedY, mc);
1535 
    SetStyle(style, mc, gc);
2028 ihaka 1536 
    return bodyBBox;
2 r 1537 
}
1538 
 
1539 
 
2028 ihaka 1540 
/*----------------------------------------------------------------------
1541 
 *
1542 
 *  Code for Accented Expressions (widehat, bar, widetilde, ...)
1543 
 *
1544 
 */
2 r 1545 
 
2028 ihaka 1546 
#define ACCENT_GAP  0.2
1547 
#define HAT_HEIGHT  0.3
2 r 1548 
 
3475 pd 1549 
#define NTILDE	    8
1550 
#define DELTA	    0.05
2 r 1551 
 
2028 ihaka 1552 
static int WideTildeAtom(SEXP expr)
2 r 1553 
{
2028 ihaka 1554 
    return NameAtom(expr) && NameMatch(expr, "widetilde");
2 r 1555 
}
1556 
 
32392 ripley 1557 
static BBOX RenderWideTilde(SEXP expr, int draw, mathContext *mc,
1558 
			    R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1559 
{
27236 murrell 1560 
    double savedX = mc->CurrentX;
1561 
    double savedY = mc->CurrentY;
1562 
    BBOX bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2028 ihaka 1563 
    double height = bboxHeight(bbox);
2124 maechler 1564 
    /*double width = bboxWidth(bbox);*/
2028 ihaka 1565 
    double totalwidth = bboxWidth(bbox) + bboxItalic(bbox);
1566 
    double delta = totalwidth * (1 - 2 * DELTA) / NTILDE;
1567 
    double start = DELTA * totalwidth;
27236 murrell 1568 
    double accentGap = ACCENT_GAP * XHeight(gc, dd);
1569 
    double hatHeight = 0.5 * HAT_HEIGHT * XHeight(gc, dd);
2028 ihaka 1570 
    double c = 8 * atan(1.0) / NTILDE;
1571 
    double x[NTILDE + 3], y[NTILDE + 3];
1572 
    double baseX, baseY, xval, yval;
1573 
    int i;
2 r 1574 
 
2028 ihaka 1575 
    if (draw) {
27236 murrell 1576 
	int savedlty = gc->lty;
1577 
	double savedlwd = gc->lwd;
2028 ihaka 1578 
	baseX = savedX;
1579 
	baseY = savedY + height + accentGap;
27236 murrell 1580 
	PMoveTo(baseX, baseY, mc);
1581 
	x[0] = ConvertedX(mc, dd);
1582 
	y[0] = ConvertedY(mc, dd);
2028 ihaka 1583 
	for (i = 0; i <= NTILDE; i++) {
1584 
	    xval = start + i * delta;
1585 
	    yval = 0.5 * hatHeight * (sin(c * i) + 1);
27236 murrell 1586 
	    PMoveTo(baseX + xval, baseY + yval, mc);
1587 
	    x[i + 1] = ConvertedX(mc, dd);
1588 
	    y[i + 1] = ConvertedY(mc, dd);
2028 ihaka 1589 
	}
27236 murrell 1590 
	PMoveTo(baseX + totalwidth, baseY + hatHeight, mc);
1591 
	x[NTILDE + 2] = ConvertedX(mc, dd);
1592 
	y[NTILDE + 2] = ConvertedY(mc, dd);
1593 
	gc->lty = LTY_SOLID;
1594 
	gc->lwd = 1;
1595 
	GEPolyline(NTILDE + 3, x, y, gc, dd);
1596 
	PMoveTo(savedX + totalwidth, savedY, mc);
1597 
	gc->lty = savedlty;
1598 
	gc->lwd = savedlwd;
2028 ihaka 1599 
    }
1600 
    return MakeBBox(height + accentGap + hatHeight,
1601 
		    bboxDepth(bbox), totalwidth);
2 r 1602 
}
1603 
 
2028 ihaka 1604 
static int WideHatAtom(SEXP expr)
2 r 1605 
{
2028 ihaka 1606 
    return NameAtom(expr) && NameMatch(expr, "widehat");
2 r 1607 
}
1608 
 
32392 ripley 1609 
static BBOX RenderWideHat(SEXP expr, int draw, mathContext *mc,
1610 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1611 
{
27236 murrell 1612 
    double savedX = mc->CurrentX;
1613 
    double savedY = mc->CurrentY;
1614 
    BBOX bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1615 
    double accentGap = ACCENT_GAP * XHeight(gc, dd);
1616 
    double hatHeight = HAT_HEIGHT * XHeight(gc, dd);
2028 ihaka 1617 
    double totalwidth = bboxWidth(bbox) + bboxItalic(bbox);
1618 
    double height = bboxHeight(bbox);
1619 
    double width = bboxWidth(bbox);
1620 
    double x[3], y[3];
2 r 1621 
 
2028 ihaka 1622 
    if (draw) {
27236 murrell 1623 
	int savedlty = gc->lty;
1624 
	double savedlwd = gc->lwd;
1625 
	PMoveTo(savedX, savedY + height + accentGap, mc);
1626 
	x[0] = ConvertedX(mc, dd);
1627 
	y[0] = ConvertedY(mc, dd);
1628 
	PMoveAcross(0.5 * totalwidth, mc);
1629 
	PMoveUp(hatHeight, mc);
1630 
	x[1] = ConvertedX(mc, dd);
1631 
	y[1] = ConvertedY(mc, dd);
1632 
	PMoveAcross(0.5 * totalwidth, mc);
1633 
	PMoveUp(-hatHeight, mc);
1634 
	x[2] = ConvertedX(mc, dd);
1635 
	y[2] = ConvertedY(mc, dd);
1636 
	gc->lty = LTY_SOLID;
1637 
	gc->lwd = 1;
1638 
	GEPolyline(3, x, y, gc, dd);
1639 
	PMoveTo(savedX + width, savedY, mc);
1640 
	gc->lty = savedlty;
1641 
	gc->lwd = savedlwd;
2028 ihaka 1642 
    }
1643 
    return EnlargeBBox(bbox, accentGap + hatHeight, 0, 0);
2 r 1644 
}
1645 
 
2028 ihaka 1646 
static int BarAtom(SEXP expr)
2 r 1647 
{
2028 ihaka 1648 
    return NameAtom(expr) && NameMatch(expr, "bar");
2 r 1649 
}
1650 
 
32392 ripley 1651 
static BBOX RenderBar(SEXP expr, int draw, mathContext *mc,
1652 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1653 
{
27236 murrell 1654 
    double savedX = mc->CurrentX;
1655 
    double savedY = mc->CurrentY;
1656 
    BBOX bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
1657 
    double accentGap = ACCENT_GAP * XHeight(gc, dd);
1658 
    /*double hatHeight = HAT_HEIGHT * XHeight(gc, dd);*/
2028 ihaka 1659 
    double height = bboxHeight(bbox);
1660 
    double width = bboxWidth(bbox);
2105 ihaka 1661 
    double offset = bboxItalic(bbox);
2028 ihaka 1662 
    double x[2], y[2];
2 r 1663 
 
2028 ihaka 1664 
    if (draw) {
27236 murrell 1665 
	int savedlty = gc->lty;
1666 
	double savedlwd = gc->lwd;
1667 
	PMoveTo(savedX + offset, savedY + height + accentGap, mc);
1668 
	x[0] = ConvertedX(mc, dd);
1669 
	y[0] = ConvertedY(mc, dd);
1670 
	PMoveAcross(width, mc);
1671 
	x[1] = ConvertedX(mc, dd);
1672 
	y[1] = ConvertedY(mc, dd);
1673 
	gc->lty = LTY_SOLID;
1674 
	gc->lwd = 1;
1675 
	GEPolyline(2, x, y, gc, dd);
1676 
	PMoveTo(savedX + width, savedY, mc);
1677 
	gc->lty = savedlty;
1678 
	gc->lwd = savedlwd;
2028 ihaka 1679 
    }
1680 
    return EnlargeBBox(bbox, accentGap, 0, 0);
2 r 1681 
}
1682 
 
2028 ihaka 1683 
static struct {
1684 
    char *name;
1685 
    int code;
2 r 1686 
}
2028 ihaka 1687 
AccentTable[] = {
3865 pd 1688 
    { "hat",		 94 },
1689 
    { "ring",		176 },
1690 
    { "tilde",		126 },
19598 ripley 1691 
    { "dot",            215 },
3865 pd 1692 
    { NULL,		  0 },
2028 ihaka 1693 
};
2122 maechler 1694 
 
2028 ihaka 1695 
static int AccentCode(SEXP expr)
2 r 1696 
{
2028 ihaka 1697 
    int i;
1698 
    for (i = 0; AccentTable[i].code; i++)
1699 
	if (NameMatch(expr, AccentTable[i].name))
1700 
	    return AccentTable[i].code;
1701 
    return 0;
2 r 1702 
}
1703 
 
2028 ihaka 1704 
static int AccentAtom(SEXP expr)
2 r 1705 
{
2105 ihaka 1706 
    return NameAtom(expr) && (AccentCode(expr) != 0);
2 r 1707 
}
1708 
 
2028 ihaka 1709 
static void InvalidAccent(SEXP expr)
2 r 1710 
{
32871 ripley 1711 
    errorcall(expr, _("invalid accent"));
2 r 1712 
}
1713 
 
32392 ripley 1714 
static BBOX RenderAccent(SEXP expr, int draw, mathContext *mc,
1715 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1716 
{
2028 ihaka 1717 
    SEXP body, accent;
27236 murrell 1718 
    double savedX = mc->CurrentX;
1719 
    double savedY = mc->CurrentY;
2028 ihaka 1720 
    BBOX bodyBBox, accentBBox;
2105 ihaka 1721 
    double xoffset, yoffset, width, italic;
2028 ihaka 1722 
    int code;
1723 
    if (length(expr) != 2)
1724 
	InvalidAccent(expr);
1725 
    accent = CAR(expr);
1726 
    body = CADR(expr);
2105 ihaka 1727 
    code = AccentCode(accent);
1728 
    if (code == 0)
2028 ihaka 1729 
	InvalidAccent(expr);
27236 murrell 1730 
    bodyBBox = RenderElement(body, 0, mc, gc, dd);
2105 ihaka 1731 
    italic = bboxItalic(bodyBBox);
19598 ripley 1732 
    if (code == 215) /* dotmath */
27236 murrell 1733 
	accentBBox = RenderSymbolChar(code, 0, mc, gc, dd);
19598 ripley 1734 
    else
27236 murrell 1735 
	accentBBox = RenderChar(code, 0, mc, gc, dd);
2105 ihaka 1736 
    width = max(bboxWidth(bodyBBox) + bboxItalic(bodyBBox),
1737 
		bboxWidth(accentBBox));
1738 
    xoffset = 0.5 *(width - bboxWidth(bodyBBox));
27236 murrell 1739 
    bodyBBox = RenderGap(xoffset, draw, mc, gc, dd);
1740 
    bodyBBox = CombineBBoxes(bodyBBox, RenderElement(body, draw, mc, gc, dd));
1741 
    bodyBBox = CombineBBoxes(bodyBBox, RenderGap(xoffset, draw, mc, gc, dd));
1742 
    PMoveTo(savedX, savedY, mc);
2105 ihaka 1743 
    xoffset = 0.5 *(width - bboxWidth(accentBBox))
1744 
	+ 0.9 * italic;
32392 ripley 1745 
    yoffset = bboxHeight(bodyBBox) + bboxDepth(accentBBox) +
1746 
	0.1 * XHeight(gc, dd);
2028 ihaka 1747 
    if (draw) {
27236 murrell 1748 
	PMoveTo(savedX + xoffset, savedY + yoffset, mc);
19598 ripley 1749 
	if (code == 215) /* dotmath */
27236 murrell 1750 
	    RenderSymbolChar(code, draw, mc, gc, dd);
19598 ripley 1751 
	else
27236 murrell 1752 
	    RenderChar(code, draw, mc, gc, dd);
2028 ihaka 1753 
    }
1754 
    bodyBBox = CombineOffsetBBoxes(bodyBBox, 0, accentBBox, 0,
1755 
				   xoffset, yoffset);
31203 murrell 1756 
    if (draw)
1757 
	PMoveTo(savedX + width, savedY, mc);
2028 ihaka 1758 
    return bodyBBox;
2 r 1759 
}
1760 
 
1761 
 
2028 ihaka 1762 
/*----------------------------------------------------------------------
1763 
 *
1764 
 *  Code for Fraction Expressions  (over, atop)
1765 
 *
1766 
 *  Rules 15, 15a, ..., 15e of the TeXBook
1767 
 *
1768 
 */
2 r 1769 
 
2028 ihaka 1770 
static void NumDenomVShift(BBOX numBBox, BBOX denomBBox,
27236 murrell 1771 
			   double *u, double *v,
1772 
			   mathContext *mc, R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1773 
{
2028 ihaka 1774 
    double a, delta, phi, theta;
27236 murrell 1775 
    a = TeX(sigma22, gc, dd);
1776 
    theta = TeX(xi8, gc, dd);
1777 
    if(mc->CurrentStyle > STYLE_T) {
1778 
	*u = TeX(sigma8, gc, dd);
1779 
	*v = TeX(sigma11, gc, dd);
2028 ihaka 1780 
	phi = 3 * theta;
1781 
    }
1782 
    else {
27236 murrell 1783 
	*u = TeX(sigma9, gc, dd);
1784 
	*v = TeX(sigma12, gc, dd);
2028 ihaka 1785 
	phi = theta;
1786 
    }
1787 
    delta = (*u - bboxDepth(numBBox)) - (a + 0.5 * theta);
1788 
    if (delta < phi)
2105 ihaka 1789 
	*u += (phi - delta) + theta;
2028 ihaka 1790 
    delta = (a + 0.5 * theta) - (bboxHeight(denomBBox) - *v);
1791 
    if (delta < phi)
2105 ihaka 1792 
	*v += (phi - delta) + theta;
2 r 1793 
}
1794 
 
2028 ihaka 1795 
static void NumDenomHShift(BBOX numBBox, BBOX denomBBox,
1796 
			   double *numShift, double *denomShift)
2 r 1797 
{
2028 ihaka 1798 
    double numWidth = bboxWidth(numBBox);
1799 
    double denomWidth = bboxWidth(denomBBox);
1800 
    if (numWidth > denomWidth) {
1801 
	*numShift = 0;
1802 
	*denomShift = (numWidth - denomWidth) / 2;
1803 
    }
1804 
    else {
1805 
	*numShift = (denomWidth - numWidth) / 2;
1806 
	*denomShift = 0;
1807 
    }
2 r 1808 
}
1809 
 
32392 ripley 1810 
static BBOX RenderFraction(SEXP expr, int rule, int draw,
1811 
			   mathContext *mc, R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1812 
{
2028 ihaka 1813 
    SEXP numerator = CADR(expr);
1814 
    SEXP denominator = CADDR(expr);
2124 maechler 1815 
    BBOX numBBox, denomBBox;
2028 ihaka 1816 
    double nHShift, dHShift;
1817 
    double nVShift, dVShift;
1818 
    double width, x[2], y[2];
27236 murrell 1819 
    double savedX = mc->CurrentX;
1820 
    double savedY = mc->CurrentY;
2028 ihaka 1821 
    STYLE style;
2 r 1822 
 
27236 murrell 1823 
    style = GetStyle(mc);
1824 
    SetNumStyle(style, mc, gc);
32392 ripley 1825 
    numBBox = RenderItalicCorr(RenderElement(numerator, 0, mc, gc, dd), 0,
1826 
			       mc, gc, dd);
27236 murrell 1827 
    SetDenomStyle(style, mc, gc);
32392 ripley 1828 
    denomBBox = RenderItalicCorr(RenderElement(denominator, 0, mc, gc, dd), 0,
1829 
				 mc, gc, dd);
27236 murrell 1830 
    SetStyle(style, mc, gc);
2 r 1831 
 
2028 ihaka 1832 
    width = max(bboxWidth(numBBox), bboxWidth(denomBBox));
1833 
    NumDenomHShift(numBBox, denomBBox, &nHShift, &dHShift);
27236 murrell 1834 
    NumDenomVShift(numBBox, denomBBox, &nVShift, &dVShift, mc, gc, dd);
2 r 1835 
 
27236 murrell 1836 
    mc->CurrentX = savedX;
1837 
    mc->CurrentY = savedY;
1838 
    SetNumStyle(style, mc, gc);
32392 ripley 1839 
    numBBox = RenderOffsetElement(numerator, nHShift, nVShift, draw, mc,
1840 
				  gc, dd);
2 r 1841 
 
27236 murrell 1842 
    mc->CurrentX = savedX;
1843 
    mc->CurrentY = savedY;
1844 
    SetDenomStyle(style, mc, gc);
32392 ripley 1845 
    denomBBox = RenderOffsetElement(denominator, dHShift, -dVShift, draw,
1846 
				    mc, gc, dd);
2 r 1847 
 
27236 murrell 1848 
    SetStyle(style, mc, gc);
2 r 1849 
 
2028 ihaka 1850 
    if (draw) {
1851 
	if (rule) {
27236 murrell 1852 
	    int savedlty = gc->lty;
1853 
	    double savedlwd = gc->lwd;
1854 
	    mc->CurrentX = savedX;
1855 
	    mc->CurrentY = savedY;
1856 
	    PMoveUp(AxisHeight(gc, dd), mc);
1857 
	    x[0] = ConvertedX(mc, dd);
1858 
	    y[0] = ConvertedY(mc, dd);
1859 
	    PMoveAcross(width, mc);
1860 
	    x[1] = ConvertedX(mc, dd);
1861 
	    y[1] = ConvertedY(mc, dd);
1862 
	    gc->lty = LTY_SOLID;
1863 
	    gc->lwd = 1;
1864 
	    GEPolyline(2, x, y, gc, dd);
1865 
	    PMoveUp(-AxisHeight(gc, dd), mc);
1866 
	    gc->lty = savedlty;
1867 
	    gc->lwd = savedlwd;
2028 ihaka 1868 
	}
27236 murrell 1869 
	PMoveTo(savedX + width, savedY, mc);
2028 ihaka 1870 
    }
1871 
    return CombineAlignedBBoxes(numBBox, denomBBox);
2 r 1872 
}
1873 
 
31430 ripley 1874 
static BBOX RenderUnderline(SEXP expr, int draw, mathContext *mc,
1875 
	        	    R_GE_gcontext *gc, GEDevDesc *dd)
1876 
{
1877 
    SEXP body = CADR(expr);
1878 
    BBOX BBox;
1879 
    double width, adepth, depth, x[2], y[2];
1880 
    double savedX = mc->CurrentX;
1881 
    double savedY = mc->CurrentY;
1882 
 
1883 
    BBox = RenderItalicCorr(RenderElement(body, 0, mc, gc, dd), 0, mc, gc, dd);
1884 
    width = bboxWidth(BBox);
1885 
 
1886 
    mc->CurrentX = savedX;
1887 
    mc->CurrentY = savedY;
1888 
    BBox = RenderElement(body, draw, mc, gc, dd);
1889 
    adepth = 0.1 * XHeight(gc, dd);
1890 
    depth = bboxDepth(BBox) + adepth;
1891 
 
1892 
    if (draw) {
1893 
        int savedlty = gc->lty;
1894 
        double savedlwd = gc->lwd;
1895 
        mc->CurrentX = savedX;
1896 
        mc->CurrentY = savedY;
1897 
        PMoveUp(-depth, mc);
1898 
        x[0] = ConvertedX(mc, dd);
1899 
        y[0] = ConvertedY(mc, dd);
1900 
        PMoveAcross(width, mc);
1901 
        x[1] = ConvertedX(mc, dd);
1902 
        y[1] = ConvertedY(mc, dd);
1903 
        gc->lty = LTY_SOLID;
1904 
        gc->lwd = 1;
1905 
        GEPolyline(2, x, y, gc, dd);
1906 
        PMoveUp(depth, mc);
1907 
        gc->lty = savedlty;
1908 
        gc->lwd = savedlwd;
1909 
        PMoveTo(savedX + width, savedY, mc);
1910 
    }
1911 
    return EnlargeBBox(BBox, 0.0, adepth, 0.0);
1912 
}
1913 
 
1914 
 
2028 ihaka 1915 
static int OverAtom(SEXP expr)
2 r 1916 
{
2105 ihaka 1917 
    return NameAtom(expr) &&
3475 pd 1918 
	(NameMatch(expr, "over") || NameMatch(expr, "frac"));
2 r 1919 
}
1920 
 
32392 ripley 1921 
static BBOX RenderOver(SEXP expr, int draw, mathContext *mc,
1922 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1923 
{
27236 murrell 1924 
    return RenderFraction(expr, 1, draw, mc, gc, dd);
2 r 1925 
}
1926 
 
31430 ripley 1927 
static int UnderlAtom(SEXP expr)
1928 
{
1929 
    return NameAtom(expr) && NameMatch(expr, "underline");
1930 
}
1931 
 
32392 ripley 1932 
static BBOX RenderUnderl(SEXP expr, int draw, mathContext *mc,
1933 
			 R_GE_gcontext *gc, GEDevDesc *dd)
31430 ripley 1934 
{
1935 
    return RenderUnderline(expr, draw, mc, gc, dd);
1936 
}
1937 
 
1938 
 
2028 ihaka 1939 
static int AtopAtom(SEXP expr)
2 r 1940 
{
2028 ihaka 1941 
    return NameAtom(expr) && NameMatch(expr, "atop");
2 r 1942 
}
1943 
 
32392 ripley 1944 
static BBOX RenderAtop(SEXP expr, int draw, mathContext *mc,
1945 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 1946 
{
27236 murrell 1947 
    return RenderFraction(expr, 0, draw, mc, gc, dd);
2 r 1948 
}
2105 ihaka 1949 
 
2028 ihaka 1950 
/*----------------------------------------------------------------------
1951 
 *
1952 
 *  Code for Grouped Expressions  (e.g. ( ... ))
1953 
 *
1954 
 *    group(ldelim, body, rdelim)
1955 
 *
1956 
 *    bgroup(ldelim, body, rdelim)
1957 
 *
1958 
 */
2 r 1959 
 
2105 ihaka 1960 
#define DelimSymbolMag 1.25
1961 
 
2028 ihaka 1962 
static int DelimCode(SEXP expr, SEXP head)
2 r 1963 
{
2028 ihaka 1964 
    int code = 0;
1965 
    if (NameAtom(head)) {
1966 
	if (NameMatch(head, "lfloor"))
1967 
	    code = S_BRACKETLEFTBT;
1968 
	else if (NameMatch(head, "rfloor"))
1969 
	    code = S_BRACKETRIGHTBT;
1970 
	if (NameMatch(head, "lceil"))
8061 murrell 1971 
	    code = S_BRACKETLEFTTP;
2028 ihaka 1972 
	else if (NameMatch(head, "rceil"))
8061 murrell 1973 
	    code = S_BRACKETRIGHTTP;
2028 ihaka 1974 
    }
1975 
    else if (StringAtom(head) && length(head) > 0) {
1976 
	if (StringMatch(head, "|"))
1977 
	    code = '|';
1978 
	else if (StringMatch(head, "||"))
1979 
	    code = 2;
1980 
	else if (StringMatch(head, "("))
1981 
	    code = '(';
1982 
	else if (StringMatch(head, ")"))
1983 
	    code = ')';
1984 
	else if (StringMatch(head, "["))
1985 
	    code = '[';
1986 
	else if (StringMatch(head, "]"))
1987 
	    code = ']';
1988 
	else if (StringMatch(head, "{"))
1989 
	    code = '{';
1990 
	else if (StringMatch(head, "}"))
1991 
	    code = '}';
1992 
	else if (StringMatch(head, "") || StringMatch(head, "."))
1993 
	    code = '.';
1994 
    }
1995 
    if (code == 0)
32871 ripley 1996 
	errorcall(expr, _("invalid group delimiter"));
2028 ihaka 1997 
    return code;
1016 maechler 1998 
}
2 r 1999 
 
32392 ripley 2000 
static BBOX RenderDelimiter(int delim, int draw, mathContext *mc,
2001 
			    R_GE_gcontext *gc, GEDevDesc *dd)
2105 ihaka 2002 
{
2003 
    BBOX bbox;
27236 murrell 2004 
    double savecex = gc->cex;
2005 
    gc->cex = DelimSymbolMag * gc->cex;
2006 
    bbox = RenderSymbolChar(delim, draw, mc, gc, dd);
2007 
    gc->cex = savecex;
2105 ihaka 2008 
    return bbox;
2009 
}
2010 
 
2028 ihaka 2011 
static int GroupAtom(SEXP expr)
2 r 2012 
{
2028 ihaka 2013 
    return NameAtom(expr) && NameMatch(expr, "group");
2 r 2014 
}
2015 
 
32392 ripley 2016 
static BBOX RenderGroup(SEXP expr, int draw, mathContext *mc,
2017 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2018 
{
27236 murrell 2019 
    double cexSaved = gc->cex;
2028 ihaka 2020 
    BBOX bbox;
2021 
    int code;
2022 
    if (length(expr) != 4)
32871 ripley 2023 
	errorcall(expr, _("invalid group specification"));
2028 ihaka 2024 
    bbox = NullBBox();
2025 
    code = DelimCode(expr, CADR(expr));
27236 murrell 2026 
    gc->cex = DelimSymbolMag * gc->cex;
2028 ihaka 2027 
    if (code == 2) {
27236 murrell 2028 
	bbox = RenderSymbolChar('|', draw, mc, gc, dd);
2029 
	bbox = RenderSymbolChar('|', draw, mc, gc, dd);
2028 ihaka 2030 
    }
2031 
    else if (code != '.')
27236 murrell 2032 
	bbox = RenderSymbolChar(code, draw, mc, gc, dd);
2033 
    gc->cex = cexSaved;
2034 
    bbox = CombineBBoxes(bbox, RenderElement(CADDR(expr), draw, mc, gc, dd));
2035 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2028 ihaka 2036 
    code = DelimCode(expr, CADDDR(expr));
27236 murrell 2037 
    gc->cex = DelimSymbolMag * gc->cex;
2028 ihaka 2038 
    if (code == 2) {
27236 murrell 2039 
	bbox = CombineBBoxes(bbox, RenderSymbolChar('|', draw, mc, gc, dd));
2040 
	bbox = CombineBBoxes(bbox, RenderSymbolChar('|', draw, mc, gc, dd));
2028 ihaka 2041 
    }
2042 
    else if (code != '.')
27236 murrell 2043 
	bbox = CombineBBoxes(bbox, RenderSymbolChar(code, draw, mc, gc, dd));
2044 
    gc->cex = cexSaved;
2028 ihaka 2045 
    return bbox;
2 r 2046 
}
2047 
 
2028 ihaka 2048 
static int BGroupAtom(SEXP expr)
2 r 2049 
{
2028 ihaka 2050 
    return NameAtom(expr) && NameMatch(expr, "bgroup");
2 r 2051 
}
2052 
 
32392 ripley 2053 
static BBOX RenderDelim(int which, double dist, int draw, mathContext *mc,
2054 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2055 
{
27236 murrell 2056 
    double savedX = mc->CurrentX;
2057 
    double savedY = mc->CurrentY;
2058 
    FontType prev = SetFont(SymbolFont, gc);
2028 ihaka 2059 
    BBOX ansBBox, topBBox, botBBox, extBBox, midBBox;
2060 
    int top, bot, ext, mid;
2105 ihaka 2061 
    int i, n;
2062 
    double topShift, botShift, extShift, midShift;
2063 
    double ytop, ybot, extHeight, delta;
27236 murrell 2064 
    double axisHeight = TeX(sigma22, gc, dd);
2 r 2065 
 
2028 ihaka 2066 
    switch(which) {
32392 ripley 2067 
    case '.':
27236 murrell 2068 
	SetFont(prev, gc);
2028 ihaka 2069 
	return NullBBox();
2070 
	break;
2071 
    case '|':
2072 
    case 2:
2073 
	top = 239; ext = 239; bot = 239; mid = 0;
2074 
	break;
2075 
    case '(':
2076 
	top = 230; ext = 231; bot = 232; mid = 0;
2077 
	break;
2078 
    case ')':
2079 
	top = 246; ext = 247; bot = 248; mid = 0;
2080 
	break;
2081 
    case '[':
2082 
	top = 233; ext = 234; bot = 235; mid = 0;
2083 
	break;
2084 
    case ']':
2085 
	top = 249; ext = 250; bot = 251; mid = 0;
2086 
	break;
2087 
    case '{':
2088 
	top = 236; ext = 239; bot = 238; mid = 237;
2122 maechler 2089 
	break;
2028 ihaka 2090 
    case '}':
2091 
	top = 252; ext = 239; bot = 254; mid = 253;
2092 
	break;
2093 
    default:
32871 ripley 2094 
	error(_("group is incomplete"));
3475 pd 2095 
	return ansBBox;/*never reached*/
2028 ihaka 2096 
    }
27236 murrell 2097 
    topBBox = GlyphBBox(top, gc, dd);
2098 
    extBBox = GlyphBBox(ext, gc, dd);
2099 
    botBBox = GlyphBBox(bot, gc, dd);
2105 ihaka 2100 
    if (which == '{' || which == '}') {
2101 
	if (1.2 * (bboxHeight(topBBox) + bboxDepth(topBBox)) > dist)
2102 
	    dist = 1.2 * (bboxHeight(topBBox) + bboxDepth(botBBox));
2103 
    }
2104 
    else {
2105 
	if (0.8 * (bboxHeight(topBBox) + bboxDepth(topBBox)) > dist)
2106 
	    dist = 0.8 * (bboxHeight(topBBox) + bboxDepth(topBBox));
2107 
    }
2108 
    extHeight = bboxHeight(extBBox) + bboxDepth(extBBox);
2028 ihaka 2109 
    topShift = dist - bboxHeight(topBBox) + axisHeight;
2110 
    botShift = dist - bboxDepth(botBBox) - axisHeight;
2105 ihaka 2111 
    extShift = 0.5 * (bboxHeight(extBBox) - bboxDepth(extBBox));
2028 ihaka 2112 
    topBBox = ShiftBBox(topBBox, topShift);
2113 
    botBBox = ShiftBBox(botBBox, -botShift);
2114 
    ansBBox = CombineAlignedBBoxes(topBBox, botBBox);
2105 ihaka 2115 
    if (which == '{' || which == '}') {
27236 murrell 2116 
	midBBox = GlyphBBox(mid, gc, dd);
2105 ihaka 2117 
	midShift = axisHeight
2118 
	    - 0.5 * (bboxHeight(midBBox) - bboxDepth(midBBox));
2119 
	midBBox = ShiftBBox(midBBox, midShift);
2120 
	ansBBox = CombineAlignedBBoxes(ansBBox, midBBox);
2121 
	if (draw) {
27236 murrell 2122 
	    PMoveTo(savedX, savedY + topShift, mc);
2123 
	    RenderSymbolChar(top, draw, mc, gc, dd);
2124 
	    PMoveTo(savedX, savedY + midShift, mc);
2125 
	    RenderSymbolChar(mid, draw, mc, gc, dd);
2126 
	    PMoveTo(savedX, savedY - botShift, mc);
2127 
	    RenderSymbolChar(bot, draw, mc, gc, dd);
2128 
	    PMoveTo(savedX + bboxWidth(ansBBox), savedY, mc);
2105 ihaka 2129 
	}
2028 ihaka 2130 
    }
2105 ihaka 2131 
    else {
2132 
	if (draw) {
2133 
	    /* draw the top and bottom elements */
27236 murrell 2134 
	    PMoveTo(savedX, savedY + topShift, mc);
2135 
	    RenderSymbolChar(top, draw, mc, gc, dd);
2136 
	    PMoveTo(savedX, savedY - botShift, mc);
2137 
	    RenderSymbolChar(bot, draw, mc, gc, dd);
2105 ihaka 2138 
	    /* now join with extenders */
2139 
	    ytop = axisHeight + dist
2140 
		- (bboxHeight(topBBox) + bboxDepth(topBBox));
2141 
	    ybot = axisHeight - dist
2142 
		+ (bboxHeight(botBBox) + bboxDepth(botBBox));
2143 
	    n = ceil((ytop - ybot) / (0.99 * extHeight));
2144 
	    if (n > 0) {
2145 
		delta = (ytop - ybot) / n;
2146 
		for (i = 0; i < n; i++) {
32392 ripley 2147 
		    PMoveTo(savedX, savedY + ybot +
2148 
			    (i + 0.5) * delta - extShift, mc);
27236 murrell 2149 
		    RenderSymbolChar(ext, draw, mc, gc, dd);
2105 ihaka 2150 
		}
2151 
	    }
27236 murrell 2152 
	    PMoveTo(savedX + bboxWidth(ansBBox), savedY, mc);
2122 maechler 2153 
 
2105 ihaka 2154 
	}
2155 
    }
27236 murrell 2156 
    SetFont(prev, gc);
2028 ihaka 2157 
    return ansBBox;
2 r 2158 
}
2159 
 
32392 ripley 2160 
static BBOX RenderBGroup(SEXP expr, int draw, mathContext *mc,
2161 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2162 
{
2028 ihaka 2163 
    double dist;
2124 maechler 2164 
    BBOX bbox;
27236 murrell 2165 
    double axisHeight = TeX(sigma22, gc, dd);
2166 
    double extra = 0.2 * xHeight(gc, dd);
2028 ihaka 2167 
    int delim1, delim2;
2168 
    if (length(expr) != 4)
32871 ripley 2169 
	errorcall(expr, _("invalid group specification"));
2028 ihaka 2170 
    bbox = NullBBox();
2171 
    delim1 = DelimCode(expr, CADR(expr));
2172 
    delim2 = DelimCode(expr, CADDDR(expr));
27236 murrell 2173 
    bbox = RenderElement(CADDR(expr), 0, mc, gc, dd);
2028 ihaka 2174 
    dist = max(bboxHeight(bbox) - axisHeight, bboxDepth(bbox) + axisHeight);
27236 murrell 2175 
    bbox = RenderDelim(delim1, dist + extra, draw, mc, gc, dd);
2176 
    bbox = CombineBBoxes(bbox,	RenderElement(CADDR(expr), draw, mc, gc, dd));
2177 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
32392 ripley 2178 
    bbox = CombineBBoxes(bbox,	RenderDelim(delim2, dist + extra, draw, mc,
2179 
					    gc, dd));
2028 ihaka 2180 
    return bbox;
2 r 2181 
}
2182 
 
2028 ihaka 2183 
/*----------------------------------------------------------------------
2184 
 *
2185 
 *  Code for Parenthetic Expressions  (i.e. ( ... ))
2186 
 *
2187 
 */
2 r 2188 
 
2028 ihaka 2189 
static int ParenAtom(SEXP expr)
2 r 2190 
{
2028 ihaka 2191 
    return NameAtom(expr) && NameMatch(expr, "(");
2 r 2192 
}
2193 
 
32392 ripley 2194 
static BBOX RenderParen(SEXP expr, int draw, mathContext *mc,
2195 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2196 
{
2028 ihaka 2197 
    BBOX bbox;
27236 murrell 2198 
    bbox = RenderDelimiter(S_PARENLEFT, draw, mc, gc, dd);
2199 
    bbox = CombineBBoxes(bbox, RenderElement(CADR(expr), draw, mc, gc, dd));
2200 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2201 
    return CombineBBoxes(bbox, RenderDelimiter(S_PARENRIGHT, draw, mc, gc, dd));
2 r 2202 
}
2203 
 
2028 ihaka 2204 
/*----------------------------------------------------------------------
2205 
 *
2206 
 *  Code for Integral Operators.
2207 
 *
2208 
 */
2 r 2209 
 
2028 ihaka 2210 
static int IntAtom(SEXP expr)
2 r 2211 
{
2028 ihaka 2212 
    return NameAtom(expr) && NameMatch(expr, "integral");
2 r 2213 
}
2214 
 
1926 ihaka 2215 
 
32392 ripley 2216 
static BBOX RenderIntSymbol(int draw, mathContext *mc, R_GE_gcontext *gc,
2217 
			    GEDevDesc *dd)
1926 ihaka 2218 
{
27236 murrell 2219 
    double savedX = mc->CurrentX;
2220 
    double savedY = mc->CurrentY;
2221 
    if (GetStyle(mc) > STYLE_T) {
2222 
	BBOX bbox1 = RenderSymbolChar(243, 0, mc, gc, dd);
2223 
	BBOX bbox2 = RenderSymbolChar(245, 0, mc, gc, dd);
2105 ihaka 2224 
	double shift;
27236 murrell 2225 
	shift = TeX(sigma22, gc, dd) + 0.99 * bboxDepth(bbox1);
2226 
	PMoveUp(shift, mc);
2227 
	bbox1 = ShiftBBox(RenderSymbolChar(243, draw, mc, gc, dd), shift);
2228 
	mc->CurrentX = savedX;
2229 
	mc->CurrentY = savedY;
2230 
	shift = TeX(sigma22, gc, dd) - 0.99 * bboxHeight(bbox2);
2231 
	PMoveUp(shift, mc);
2232 
	bbox2 = ShiftBBox(RenderSymbolChar(245, draw, mc, gc, dd), shift);
2105 ihaka 2233 
	if (draw)
32392 ripley 2234 
	    PMoveTo(savedX + max(bboxWidth(bbox1), bboxWidth(bbox2)),
2235 
		    savedY, mc);
2105 ihaka 2236 
	else
27236 murrell 2237 
	    PMoveTo(savedX, savedY, mc);
2105 ihaka 2238 
	return CombineAlignedBBoxes(bbox1, bbox2);
2239 
    }
2240 
    else {
27236 murrell 2241 
	return RenderSymbolChar(0362, draw, mc, gc, dd);
2105 ihaka 2242 
    }
1926 ihaka 2243 
}
2244 
 
32392 ripley 2245 
static BBOX RenderInt(SEXP expr, int draw, mathContext *mc,
2246 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2247 
{
2028 ihaka 2248 
    BBOX opBBox, lowerBBox, upperBBox, bodyBBox;
2249 
    int nexpr = length(expr);
27236 murrell 2250 
    STYLE style = GetStyle(mc);
2251 
    double savedX = mc->CurrentX;
2252 
    double savedY = mc->CurrentY;
2028 ihaka 2253 
    double hshift, vshift, width;
2 r 2254 
 
27236 murrell 2255 
    opBBox = RenderIntSymbol(draw, mc, gc, dd);
2028 ihaka 2256 
    width = bboxWidth(opBBox);
27236 murrell 2257 
    mc->CurrentX = savedX;
2258 
    mc->CurrentY = savedY;
2028 ihaka 2259 
    if (nexpr > 2) {
27236 murrell 2260 
	hshift = 0.5 * width + ThinSpace(gc, dd);
2261 
	SetSubStyle(style, mc, gc);
2262 
	lowerBBox = RenderElement(CADDR(expr), 0, mc, gc, dd);
2028 ihaka 2263 
	vshift = bboxDepth(opBBox) + CenterShift(lowerBBox);
32392 ripley 2264 
	lowerBBox = RenderOffsetElement(CADDR(expr), hshift, -vshift, draw,
2265 
					mc, gc, dd);
2028 ihaka 2266 
	opBBox = CombineAlignedBBoxes(opBBox, lowerBBox);
27236 murrell 2267 
	SetStyle(style, mc, gc);
2268 
	mc->CurrentX = savedX;
2269 
	mc->CurrentY = savedY;
1839 ihaka 2270 
    }
2028 ihaka 2271 
    if (nexpr > 3) {
27236 murrell 2272 
	hshift = width + ThinSpace(gc, dd);
2273 
	SetSupStyle(style, mc, gc);
2274 
	upperBBox = RenderElement(CADDDR(expr), 0, mc, gc, dd);
2028 ihaka 2275 
	vshift = bboxHeight(opBBox) - CenterShift(upperBBox);
32392 ripley 2276 
	upperBBox = RenderOffsetElement(CADDDR(expr), hshift, vshift, draw,
2277 
					mc, gc, dd);
2028 ihaka 2278 
	opBBox = CombineAlignedBBoxes(opBBox, upperBBox);
27236 murrell 2279 
	SetStyle(style, mc, gc);
2280 
	mc->CurrentX = savedX;
2281 
	mc->CurrentY = savedY;
1839 ihaka 2282 
    }
27236 murrell 2283 
    PMoveAcross(bboxWidth(opBBox), mc);
2028 ihaka 2284 
    if (nexpr > 1) {
27236 murrell 2285 
	bodyBBox = RenderElement(CADR(expr), draw, mc, gc, dd);
2028 ihaka 2286 
	opBBox = CombineBBoxes(opBBox, bodyBBox);
1839 ihaka 2287 
    }
2028 ihaka 2288 
    return opBBox;
2 r 2289 
}
2290 
 
2291 
 
2028 ihaka 2292 
/*----------------------------------------------------------------------
2293 
 *
2294 
 *  Code for Operator Expressions (sum, product, lim, inf, sup, ...)
2295 
 *
2296 
 */
2 r 2297 
 
2028 ihaka 2298 
#define OperatorSymbolMag  1.25
2 r 2299 
 
2028 ihaka 2300 
static SymTab OpTable[] = {
3865 pd 2301 
    { "prod",		S_PRODUCT },
2302 
    { "sum",		S_SUM },
2303 
    { "union",		S_UNION },
2304 
    { "intersect",	S_INTERSECTION },
2305 
    { "lim",		N_LIM },
2306 
    { "liminf",		N_LIMINF },
2307 
    { "limsup",		N_LIMINF },
2308 
    { "inf",		N_INF },
2309 
    { "sup",		N_SUP },
2310 
    { "min",		N_MIN },
2311 
    { "max",		N_MAX },
2312 
    { NULL,		0 }
2028 ihaka 2313 
};
2 r 2314 
 
2028 ihaka 2315 
static int OpAtom(SEXP expr)
2 r 2316 
{
2028 ihaka 2317 
    int i;
2318 
    for (i = 0; OpTable[i].code; i++)
2319 
	if (NameMatch(expr, OpTable[i].name))
2320 
	    return OpTable[i].code;
2321 
    return 0;
2 r 2322 
}
2323 
 
32392 ripley 2324 
static BBOX RenderOpSymbol(SEXP op, int draw, mathContext *mc,
2325 
			   R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2326 
{
2028 ihaka 2327 
    BBOX bbox;
27236 murrell 2328 
    double cexSaved = gc->cex;
2329 
    /*double savedX = mc->CurrentX;*/
2330 
    /*double savedY = mc->CurrentY;*/
2028 ihaka 2331 
    double shift;
27236 murrell 2332 
    int display = (GetStyle(mc) > STYLE_T);
2028 ihaka 2333 
    int opId = OpAtom(op);
2 r 2334 
 
8061 murrell 2335 
    if (opId == S_SUM || opId == S_PRODUCT ||
2336 
	opId == S_UNION || opId == S_INTERSECTION) {
2105 ihaka 2337 
	if (display) {
27236 murrell 2338 
	    gc->cex = OperatorSymbolMag * gc->cex;
2339 
	    bbox = RenderSymbolChar(OpAtom(op), 0, mc, gc, dd);
32392 ripley 2340 
	    shift = 0.5 * (bboxHeight(bbox) - bboxDepth(bbox)) -
2341 
		TeX(sigma22, gc, dd);
2105 ihaka 2342 
	    if (draw) {
27236 murrell 2343 
		PMoveUp(-shift, mc);
2344 
		bbox = RenderSymbolChar(opId, 1, mc, gc, dd);
2345 
		PMoveUp(shift, mc);
2105 ihaka 2346 
	    }
27236 murrell 2347 
	    gc->cex = cexSaved;
2105 ihaka 2348 
	    return ShiftBBox(bbox, -shift);
2028 ihaka 2349 
	}
27236 murrell 2350 
	else return RenderSymbolChar(opId, draw, mc, gc, dd);
2028 ihaka 2351 
    }
1839 ihaka 2352 
    else {
27236 murrell 2353 
	FontType prevfont = SetFont(PlainFont, gc);
2354 
	bbox = RenderStr(CHAR(PRINTNAME(op)), draw, mc, gc, dd);
2355 
	SetFont(prevfont, gc);
2028 ihaka 2356 
	return bbox;
1839 ihaka 2357 
    }
2 r 2358 
}
2359 
 
32392 ripley 2360 
static BBOX RenderOp(SEXP expr, int draw, mathContext *mc,
2361 
		     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2362 
{
2028 ihaka 2363 
    BBOX lowerBBox, upperBBox, bodyBBox;
27236 murrell 2364 
    double savedX = mc->CurrentX;
2365 
    double savedY = mc->CurrentY;
2028 ihaka 2366 
    int nexpr = length(expr);
27236 murrell 2367 
    STYLE style = GetStyle(mc);
2368 
    BBOX opBBox = RenderOpSymbol(CAR(expr), 0, mc, gc, dd);
2028 ihaka 2369 
    double width = bboxWidth(opBBox);
2370 
    double hshift, lvshift, uvshift;
3865 pd 2371 
    lvshift = uvshift = 0;	/* -Wall */
2028 ihaka 2372 
    if (nexpr > 2) {
27236 murrell 2373 
	SetSubStyle(style, mc, gc);
2374 
	lowerBBox = RenderElement(CADDR(expr), 0, mc, gc, dd);
2375 
	SetStyle(style, mc, gc);
2028 ihaka 2376 
	width = max(width, bboxWidth(lowerBBox));
32392 ripley 2377 
	lvshift = max(TeX(xi10, gc, dd), TeX(xi12, gc, dd) -
2378 
		      bboxHeight(lowerBBox));
2028 ihaka 2379 
	lvshift = bboxDepth(opBBox) + bboxHeight(lowerBBox) + lvshift;
2380 
    }
2381 
    if (nexpr > 3) {
27236 murrell 2382 
	SetSupStyle(style, mc, gc);
2383 
	upperBBox = RenderElement(CADDDR(expr), 0, mc, gc, dd);
2384 
	SetStyle(style, mc, gc);
2028 ihaka 2385 
	width = max(width, bboxWidth(upperBBox));
32392 ripley 2386 
	uvshift = max(TeX(xi9, gc, dd), TeX(xi11, gc, dd) -
2387 
		      bboxDepth(upperBBox));
2028 ihaka 2388 
	uvshift = bboxHeight(opBBox) + bboxDepth(upperBBox) + uvshift;
2389 
    }
2390 
    hshift = 0.5 * (width - bboxWidth(opBBox));
27236 murrell 2391 
    opBBox = RenderGap(hshift, draw, mc, gc, dd);
32392 ripley 2392 
    opBBox = CombineBBoxes(opBBox,
2393 
			   RenderOpSymbol(CAR(expr), draw, mc, gc, dd));
27236 murrell 2394 
    mc->CurrentX = savedX;
2395 
    mc->CurrentY = savedY;
2028 ihaka 2396 
    if (nexpr > 2) {
27236 murrell 2397 
	SetSubStyle(style, mc, gc);
2028 ihaka 2398 
	hshift = 0.5 * (width - bboxWidth(lowerBBox));
32392 ripley 2399 
	lowerBBox = RenderOffsetElement(CADDR(expr), hshift, -lvshift, draw,
2400 
					mc, gc, dd);
27236 murrell 2401 
	SetStyle(style, mc, gc);
2028 ihaka 2402 
	opBBox = CombineAlignedBBoxes(opBBox, lowerBBox);
27236 murrell 2403 
	mc->CurrentX = savedX;
2404 
	mc->CurrentY = savedY;
2028 ihaka 2405 
    }
2406 
    if (nexpr > 3) {
27236 murrell 2407 
	SetSupStyle(style, mc, gc);
2028 ihaka 2408 
	hshift = 0.5 * (width - bboxWidth(upperBBox));
32392 ripley 2409 
	upperBBox = RenderOffsetElement(CADDDR(expr), hshift, uvshift, draw,
2410 
					mc, gc, dd);
27236 murrell 2411 
	SetStyle(style, mc, gc);
2028 ihaka 2412 
	opBBox = CombineAlignedBBoxes(opBBox, upperBBox);
27236 murrell 2413 
	mc->CurrentX = savedX;
2414 
	mc->CurrentY = savedY;
2028 ihaka 2415 
    }
27236 murrell 2416 
    opBBox = EnlargeBBox(opBBox, TeX(xi13, gc, dd), TeX(xi13, gc, dd), 0);
2028 ihaka 2417 
    if (draw)
27236 murrell 2418 
	PMoveAcross(width, mc);
32392 ripley 2419 
    opBBox = CombineBBoxes(opBBox,
2420 
			   RenderGap(ThinSpace(gc, dd), draw, mc, gc, dd));
27236 murrell 2421 
    bodyBBox = RenderElement(CADR(expr), draw, mc, gc, dd);
2028 ihaka 2422 
    return CombineBBoxes(opBBox, bodyBBox);
2 r 2423 
}
2424 
 
2425 
 
2028 ihaka 2426 
/*----------------------------------------------------------------------
2427 
 *
2428 
 *  Code for radical expressions (root, sqrt)
2429 
 *
2430 
 *  Tunable parameteters :
2431 
 *
3475 pd 2432 
 *  RADICAL_GAP	   The gap between the nucleus and the radical extension.
2028 ihaka 2433 
 *  RADICAL_SPACE  Extra space to the left and right of the nucleus.
2434 
 *
2435 
 */
2 r 2436 
 
2028 ihaka 2437 
#define RADICAL_GAP    0.4
2438 
#define RADICAL_SPACE  0.2
2 r 2439 
 
2028 ihaka 2440 
static int RadicalAtom(SEXP expr)
2 r 2441 
{
2028 ihaka 2442 
    return NameAtom(expr) &&
2443 
	(NameMatch(expr, "root") ||
2444 
	 NameMatch(expr, "sqrt"));
2 r 2445 
}
2446 
 
32392 ripley 2447 
static BBOX RenderScript(SEXP expr, int draw, mathContext *mc,
2448 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2449 
{
2028 ihaka 2450 
    BBOX bbox;
27236 murrell 2451 
    STYLE style = GetStyle(mc);
2452 
    SetSupStyle(style, mc, gc);
2453 
    bbox = RenderElement(expr, draw, mc, gc, dd);
2454 
    SetStyle(style, mc, gc);
2028 ihaka 2455 
    return bbox;
2 r 2456 
}
2457 
 
32392 ripley 2458 
static BBOX RenderRadical(SEXP expr, int draw, mathContext *mc,
2459 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2460 
{
1839 ihaka 2461 
    SEXP body = CADR(expr);
2028 ihaka 2462 
    SEXP order = CADDR(expr);
2124 maechler 2463 
    BBOX bodyBBox, orderBBox;
2028 ihaka 2464 
    double radWidth, radHeight, radDepth;
2465 
    double leadWidth, leadHeight, twiddleHeight;
2466 
    double hshift, vshift;
2467 
    double radGap, radSpace, radTrail;
27236 murrell 2468 
    STYLE style = GetStyle(mc);
2469 
    double savedX = mc->CurrentX;
2470 
    double savedY = mc->CurrentY;
2028 ihaka 2471 
    double x[5], y[5];
2 r 2472 
 
27236 murrell 2473 
    radGap = RADICAL_GAP * xHeight(gc, dd);
2474 
    radSpace = RADICAL_SPACE * xHeight(gc, dd);
2475 
    radTrail = MuSpace(gc, dd);
2476 
    SetPrimeStyle(style, mc, gc);
2477 
    bodyBBox = RenderElement(body, 0, mc, gc, dd);
2478 
    bodyBBox = RenderItalicCorr(bodyBBox, 0, mc, gc, dd);
2 r 2479 
 
27236 murrell 2480 
    radWidth = 0.6 *XHeight(gc, dd);
2028 ihaka 2481 
    radHeight = bboxHeight(bodyBBox) + radGap;
2482 
    radDepth = bboxDepth(bodyBBox);
2483 
    twiddleHeight = CenterShift(bodyBBox);
2 r 2484 
 
2028 ihaka 2485 
    leadWidth = radWidth;
2486 
    leadHeight = radHeight;
2487 
    if (order != R_NilValue) {
27236 murrell 2488 
	SetSupStyle(style, mc, gc);
2489 
	orderBBox = RenderScript(order, 0, mc, gc, dd);
2028 ihaka 2490 
	leadWidth = max(leadWidth, bboxWidth(orderBBox) + 0.4 * radWidth);
2491 
	hshift = leadWidth - bboxWidth(orderBBox) - 0.4 * radWidth;
2492 
	vshift = leadHeight - bboxHeight(orderBBox);
2493 
	if (vshift - bboxDepth(orderBBox) < twiddleHeight + radGap)
2494 
	    vshift = twiddleHeight + bboxDepth(orderBBox) + radGap;
2495 
	if (draw) {
27236 murrell 2496 
	    PMoveTo(savedX + hshift, savedY + vshift, mc);
2497 
	    orderBBox = RenderScript(order, draw, mc, gc, dd);
2028 ihaka 2498 
	}
2499 
	orderBBox = EnlargeBBox(orderBBox, vshift, 0, hshift);
1839 ihaka 2500 
    }
2028 ihaka 2501 
    else
2502 
	orderBBox = NullBBox();
2503 
    if (draw) {
27236 murrell 2504 
	int savedlty = gc->lty;
2505 
	double savedlwd = gc->lwd;
2506 
	PMoveTo(savedX + leadWidth - radWidth, savedY, mc);
2507 
	PMoveUp(0.8 * twiddleHeight, mc);
2508 
	x[0] = ConvertedX(mc, dd);
2509 
	y[0] = ConvertedY(mc, dd);
2510 
	PMoveUp(0.2 * twiddleHeight, mc);
2511 
	PMoveAcross(0.3 * radWidth, mc);
2512 
	x[1] = ConvertedX(mc, dd);
2513 
	y[1] = ConvertedY(mc, dd);
2514 
	PMoveUp(-(twiddleHeight + bboxDepth(bodyBBox)), mc);
2515 
	PMoveAcross(0.3 * radWidth, mc);
2516 
	x[2] = ConvertedX(mc, dd);
2517 
	y[2] = ConvertedY(mc, dd);
2518 
	PMoveUp(bboxDepth(bodyBBox) + bboxHeight(bodyBBox) + radGap, mc);
2519 
	PMoveAcross(0.4 * radWidth, mc);
2520 
	x[3] = ConvertedX(mc, dd);
2521 
	y[3] = ConvertedY(mc, dd);
2522 
	PMoveAcross(radSpace + bboxWidth(bodyBBox) + radTrail, mc);
2523 
	x[4] = ConvertedX(mc, dd);
2524 
	y[4] = ConvertedY(mc, dd);
2525 
	gc->lty = LTY_SOLID;
2526 
	gc->lwd = 1;
2527 
	GEPolyline(5, x, y, gc, dd);
2528 
	PMoveTo(savedX, savedY, mc);
2529 
	gc->lty = savedlty;
2530 
	gc->lwd = savedlwd;
2028 ihaka 2531 
    }
32392 ripley 2532 
    orderBBox =
2533 
	CombineAlignedBBoxes(orderBBox,
2534 
			     RenderGap(leadWidth + radSpace, draw, mc, gc, dd));
27236 murrell 2535 
    SetPrimeStyle(style, mc, gc);
32392 ripley 2536 
    orderBBox = CombineBBoxes(orderBBox,
2537 
			      RenderElement(body, draw, mc, gc, dd));
2538 
    orderBBox = CombineBBoxes(orderBBox,
2539 
			      RenderGap(2 * radTrail, draw, mc, gc, dd));
16224 maechler 2540 
    orderBBox = EnlargeBBox(orderBBox, radGap, 0, 0);/* << fixes PR#1101 */
27236 murrell 2541 
    SetStyle(style, mc, gc);
2028 ihaka 2542 
    return orderBBox;
2 r 2543 
}
2544 
 
2028 ihaka 2545 
/*----------------------------------------------------------------------
2546 
 *
2547 
 *  Code for Absolute Value Expressions (abs)
2548 
 *
2549 
 */
2 r 2550 
 
2028 ihaka 2551 
static int AbsAtom(SEXP expr)
2 r 2552 
{
2028 ihaka 2553 
    return NameAtom(expr) && NameMatch(expr, "abs");
2 r 2554 
}
2555 
 
32392 ripley 2556 
static BBOX RenderAbs(SEXP expr, int draw, mathContext *mc,
2557 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2558 
{
27236 murrell 2559 
    BBOX bbox = RenderElement(CADR(expr), 0, mc, gc, dd);
2028 ihaka 2560 
    double height = bboxHeight(bbox);
2561 
    double depth = bboxDepth(bbox);
1839 ihaka 2562 
    double x[2], y[2];
2 r 2563 
 
27236 murrell 2564 
    bbox= RenderGap(MuSpace(gc, dd), draw, mc, gc, dd);
2028 ihaka 2565 
    if (draw) {
27236 murrell 2566 
	int savedlty = gc->lty;
2567 
	double savedlwd = gc->lwd;
2568 
	PMoveUp(-depth, mc);
2569 
	x[0] = ConvertedX(mc, dd);
2570 
	y[0] = ConvertedY(mc, dd);
2571 
	PMoveUp(depth + height, mc);
2572 
	x[1] = ConvertedX(mc, dd);
2573 
	y[1] = ConvertedY(mc, dd);
2574 
	gc->lty = LTY_SOLID;
2575 
	gc->lwd = 1;
2576 
	GEPolyline(2, x, y, gc, dd);
2577 
	PMoveUp(-height, mc);
2578 
	gc->lty = savedlty;
2579 
	gc->lwd = savedlwd;
2028 ihaka 2580 
    }
27236 murrell 2581 
    bbox = CombineBBoxes(bbox, RenderGap(MuSpace(gc, dd), draw, mc, gc, dd));
2582 
    bbox = CombineBBoxes(bbox, RenderElement(CADR(expr), draw, mc, gc, dd));
2583 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2584 
    bbox = CombineBBoxes(bbox, RenderGap(MuSpace(gc, dd), draw, mc, gc, dd));
2028 ihaka 2585 
    if (draw) {
27236 murrell 2586 
	int savedlty = gc->lty;
2587 
	double savedlwd = gc->lwd;
2588 
	PMoveUp(-depth, mc);
2589 
	x[0] = ConvertedX(mc, dd);
2590 
	y[0] = ConvertedY(mc, dd);
2591 
	PMoveUp(depth + height, mc);
2592 
	x[1] = ConvertedX(mc, dd);
2593 
	y[1] = ConvertedY(mc, dd);
2594 
	gc->lty = LTY_SOLID;
2595 
	gc->lwd = 1;
2596 
	GEPolyline(2, x, y, gc, dd);
2597 
	PMoveUp(-height, mc);
2598 
	gc->lty = savedlty;
2599 
	gc->lwd = savedlwd;
2028 ihaka 2600 
    }
27236 murrell 2601 
    bbox = CombineBBoxes(bbox, RenderGap(MuSpace(gc, dd), draw, mc, gc, dd));
2028 ihaka 2602 
    return bbox;
2 r 2603 
}
2604 
 
2028 ihaka 2605 
/*----------------------------------------------------------------------
2606 
 *
2607 
 *  Code for Grouped Expressions (i.e. { ... } )
2608 
 *
2609 
 */
2 r 2610 
 
2028 ihaka 2611 
static int CurlyAtom(SEXP expr)
2 r 2612 
{
2028 ihaka 2613 
    return NameAtom(expr) &&
2614 
	NameMatch(expr, "{");
2 r 2615 
}
2616 
 
32392 ripley 2617 
static BBOX RenderCurly(SEXP expr, int draw, mathContext *mc,
2618 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2619 
{
27236 murrell 2620 
    return RenderElement(CADR(expr), draw, mc, gc, dd);
2 r 2621 
}
2622 
 
2623 
 
2028 ihaka 2624 
/*----------------------------------------------------------------------
2625 
 *
2626 
 *  Code for Relation Expressions (i.e. ... ==, !=, ...)
2627 
 *
2628 
 */
2 r 2629 
 
3475 pd 2630 
				/* Binary Relationships */
7824 ripley 2631 
static
2028 ihaka 2632 
SymTab RelTable[] = {
3865 pd 2633 
    { "<",		 60 },	/* less */
2634 
    { "==",		 61 },	/* equal */
2635 
    { ">",		 62 },	/* greater */
2636 
    { "%=~%",		 64 },	/* congruent */
2637 
    { "!=",		185 },	/* not equal */
2638 
    { "<=",		163 },	/* less or equal */
2639 
    { ">=",		179 },	/* greater or equal */
2640 
    { "%==%",		186 },	/* equivalence */
2641 
    { "%~~%",		187 },	/* approxequal */
8061 murrell 2642 
    { "%prop%",         181 },  /* proportional to */
2 r 2643 
 
3865 pd 2644 
    { "%<->%",		171 },	/* Arrows */
2645 
    { "%<-%",		172 },
2646 
    { "%up%",		173 },
2647 
    { "%->%",		174 },
2648 
    { "%down%",		175 },
2649 
    { "%<=>%",		219 },
2650 
    { "%<=%",		220 },
2651 
    { "%dblup%",	221 },
2652 
    { "%=>%",		222 },
2653 
    { "%dbldown%",	223 },
2 r 2654 
 
3865 pd 2655 
    { "%supset%",	201 },	/* Sets (TeX Names) */
2656 
    { "%supseteq%",	202 },
2657 
    { "%notsubset%",	203 },
2658 
    { "%subset%",	204 },
2659 
    { "%subseteq%",	205 },
2660 
    { "%in%",		206 },
2661 
    { "%notin%",	207 },
2 r 2662 
 
3865 pd 2663 
    { NULL,		  0 },
2028 ihaka 2664 
};
1016 maechler 2665 
 
2028 ihaka 2666 
static int RelAtom(SEXP expr)
2 r 2667 
{
2028 ihaka 2668 
    int i;
2669 
    for (i = 0; RelTable[i].code; i++)
2670 
	if (NameMatch(expr, RelTable[i].name))
2671 
	    return RelTable[i].code;
2672 
    return 0;
2 r 2673 
}
2674 
 
32392 ripley 2675 
static BBOX RenderRel(SEXP expr, int draw, mathContext *mc,
2676 
		      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2677 
{
2028 ihaka 2678 
    int op = RelAtom(CAR(expr));
2679 
    int nexpr = length(expr);
2680 
    BBOX bbox;
2681 
    double gap;
2 r 2682 
 
2028 ihaka 2683 
    if(nexpr == 3) {
27236 murrell 2684 
	gap = (mc->CurrentStyle > STYLE_S) ? ThickSpace(gc, dd) : 0;
2685 
	bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2686 
	bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2687 
	bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
2688 
	bbox = CombineBBoxes(bbox, RenderSymbolChar(op, draw, mc, gc, dd));
2689 
	bbox = CombineBBoxes(bbox, RenderGap(gap, draw, mc, gc, dd));
32392 ripley 2690 
	return
2691 
	    CombineBBoxes(bbox, RenderElement(CADDR(expr), draw, mc, gc, dd));
2 r 2692 
    }
32871 ripley 2693 
    else error(_("invalid mathematical annotation"));
3865 pd 2694 
 
2695 
    return NullBBox();		/* -Wall */
2 r 2696 
}
2697 
 
1016 maechler 2698 
 
2028 ihaka 2699 
/*----------------------------------------------------------------------
2700 
 *
2701 
 *  Code for Boldface Expressions
2702 
 *
2703 
 */
2 r 2704 
 
2028 ihaka 2705 
static int BoldAtom(SEXP expr)
2 r 2706 
{
2028 ihaka 2707 
    return NameAtom(expr) &&
2708 
	NameMatch(expr, "bold");
2 r 2709 
}
2710 
 
32392 ripley 2711 
static BBOX RenderBold(SEXP expr, int draw, mathContext *mc,
2712 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2713 
{
2028 ihaka 2714 
    BBOX bbox;
27236 murrell 2715 
    FontType prevfont = SetFont(BoldFont, gc);
2716 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2717 
    SetFont(prevfont, gc);
2028 ihaka 2718 
    return bbox;
2 r 2719 
}
2720 
 
2028 ihaka 2721 
/*----------------------------------------------------------------------
2722 
 *
2723 
 *  Code for Italic Expressions
2724 
 *
2725 
 */
2 r 2726 
 
2028 ihaka 2727 
static int ItalicAtom(SEXP expr)
2 r 2728 
{
2028 ihaka 2729 
    return NameAtom(expr) &&
2730 
	(NameMatch(expr, "italic") || NameMatch(expr, "math"));
2 r 2731 
}
2732 
 
32392 ripley 2733 
static BBOX RenderItalic(SEXP expr, int draw, mathContext *mc,
2734 
			 R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2735 
{
2028 ihaka 2736 
    BBOX bbox;
27236 murrell 2737 
    FontType prevfont = SetFont(ItalicFont, gc);
2738 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2739 
    SetFont(prevfont, gc);
2028 ihaka 2740 
    return bbox;
2 r 2741 
}
2742 
 
2028 ihaka 2743 
/*----------------------------------------------------------------------
2744 
 *
2745 
 *  Code for Plain (i.e. Roman) Expressions
2746 
 *
2747 
 */
2 r 2748 
 
2028 ihaka 2749 
static int PlainAtom(SEXP expr)
2 r 2750 
{
2028 ihaka 2751 
    return NameAtom(expr) &&
2752 
	NameMatch(expr, "plain");
2 r 2753 
}
2754 
 
32392 ripley 2755 
static BBOX RenderPlain(SEXP expr, int draw, mathContext *mc,
2756 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2757 
{
2028 ihaka 2758 
    BBOX bbox;
27236 murrell 2759 
    int prevfont = SetFont(PlainFont, gc);
2760 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2761 
    SetFont(prevfont, gc);
2028 ihaka 2762 
    return bbox;
2 r 2763 
}
2764 
 
2028 ihaka 2765 
/*----------------------------------------------------------------------
2766 
 *
2767 
 *  Code for Bold Italic Expressions
2768 
 *
2769 
 */
2 r 2770 
 
2028 ihaka 2771 
static int BoldItalicAtom(SEXP expr)
2 r 2772 
{
2028 ihaka 2773 
    return NameAtom(expr) &&
2774 
	(NameMatch(expr, "bolditalic") || NameMatch(expr, "boldmath"));
2 r 2775 
}
2776 
 
32392 ripley 2777 
static BBOX RenderBoldItalic(SEXP expr, int draw, mathContext *mc,
2778 
			     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2779 
{
2028 ihaka 2780 
    BBOX bbox;
27236 murrell 2781 
    int prevfont = SetFont(BoldItalicFont, gc);
2782 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2783 
    SetFont(prevfont, gc);
2028 ihaka 2784 
    return bbox;
2 r 2785 
}
2786 
 
2028 ihaka 2787 
/*----------------------------------------------------------------------
2788 
 *
2789 
 *  Code for Styles
2790 
 *
2791 
 */
2 r 2792 
 
2028 ihaka 2793 
static int StyleAtom(SEXP expr)
2 r 2794 
{
2028 ihaka 2795 
    return (NameAtom(expr) &&
2796 
	    (NameMatch(expr, "displaystyle") ||
2797 
	     NameMatch(expr, "textstyle")    ||
2798 
	     NameMatch(expr, "scriptstyle")   ||
2799 
	     NameMatch(expr, "scriptscriptstyle")));
2 r 2800 
}
2801 
 
32392 ripley 2802 
static BBOX RenderStyle(SEXP expr, int draw, mathContext *mc,
2803 
			R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2804 
{
27236 murrell 2805 
    STYLE prevstyle = GetStyle(mc);
2028 ihaka 2806 
    BBOX bbox;
2122 maechler 2807 
    if (NameMatch(CAR(expr), "displaystyle"))
27236 murrell 2808 
	SetStyle(STYLE_D, mc, gc);
2122 maechler 2809 
    else if (NameMatch(CAR(expr), "textstyle"))
27236 murrell 2810 
	SetStyle(STYLE_T, mc, gc);
2122 maechler 2811 
    else if (NameMatch(CAR(expr), "scriptstyle"))
27236 murrell 2812 
	SetStyle(STYLE_S, mc, gc);
2122 maechler 2813 
    else if (NameMatch(CAR(expr), "scriptscriptstyle"))
27236 murrell 2814 
	SetStyle(STYLE_SS, mc, gc);
2815 
    bbox = RenderElement(CADR(expr), draw, mc, gc, dd);
2816 
    SetStyle(prevstyle, mc, gc);
2028 ihaka 2817 
    return bbox;
2 r 2818 
}
2819 
 
2028 ihaka 2820 
/*----------------------------------------------------------------------
2821 
 *
2822 
 *  Code for Phantom Expressions
2823 
 *
2824 
 */
2 r 2825 
 
2028 ihaka 2826 
static int PhantomAtom(SEXP expr)
2 r 2827 
{
2028 ihaka 2828 
    return (NameAtom(expr) &&
2829 
	    (NameMatch(expr, "phantom") ||
2830 
	     NameMatch(expr, "vphantom")));
2 r 2831 
}
2832 
 
32392 ripley 2833 
static BBOX RenderPhantom(SEXP expr, int draw, mathContext *mc,
2834 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2835 
{
27236 murrell 2836 
    BBOX bbox = RenderElement(CADR(expr), 0, mc, gc, dd);
2028 ihaka 2837 
    if (NameMatch(CAR(expr), "vphantom")) {
2838 
	bboxWidth(bbox) = 0;
2839 
	bboxItalic(bbox) = 0;
2840 
    }
27236 murrell 2841 
    else RenderGap(bboxWidth(bbox), draw, mc, gc, dd);
2028 ihaka 2842 
    return bbox;
2 r 2843 
}
2844 
 
2028 ihaka 2845 
/*----------------------------------------------------------------------
2846 
 *
2847 
 *  Code for Concatenate Expressions
2848 
 *
2849 
 */
2 r 2850 
 
2028 ihaka 2851 
static int ConcatenateAtom(SEXP expr)
2 r 2852 
{
2028 ihaka 2853 
    return NameAtom(expr) && NameMatch(expr, "paste");
2 r 2854 
}
2855 
 
32392 ripley 2856 
static BBOX RenderConcatenate(SEXP expr, int draw, mathContext *mc,
2857 
			      R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2858 
{
3786 pd 2859 
    BBOX bbox = NullBBox();
2028 ihaka 2860 
    int i, n;
2 r 2861 
 
2028 ihaka 2862 
    expr = CDR(expr);
2863 
    n = length(expr);
2 r 2864 
 
2028 ihaka 2865 
    for (i = 0; i < n; i++) {
27236 murrell 2866 
	bbox = CombineBBoxes(bbox, RenderElement(CAR(expr), draw, mc, gc, dd));
2028 ihaka 2867 
	if (i != n - 1)
27236 murrell 2868 
	    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2028 ihaka 2869 
	expr = CDR(expr);
2870 
    }
2871 
    return bbox;
2 r 2872 
}
2873 
 
2028 ihaka 2874 
/*----------------------------------------------------------------------
2875 
 *
2876 
 *  Code for Comma-Separated Lists
2877 
 *
2878 
 */
2 r 2879 
 
32392 ripley 2880 
static BBOX RenderCommaList(SEXP expr, int draw, mathContext *mc,
2881 
			    R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2882 
{
2028 ihaka 2883 
    BBOX bbox = NullBBox();
27236 murrell 2884 
    double small = 0.4 * ThinSpace(gc, dd);
2028 ihaka 2885 
    int i, n;
2886 
    n = length(expr);
2887 
    for (i = 0; i < n; i++) {
2888 
	if (NameAtom(CAR(expr)) && NameMatch(CAR(expr), "...")) {
2889 
	    if (i > 0) {
32392 ripley 2890 
		bbox = CombineBBoxes(bbox, RenderSymbolChar(S_COMMA, draw,
2891 
							    mc, gc, dd));
2892 
		bbox = CombineBBoxes(bbox, RenderSymbolChar(S_SPACE, draw,
2893 
							    mc, gc, dd));
2028 ihaka 2894 
	    }
32392 ripley 2895 
	    bbox = CombineBBoxes(bbox, RenderSymbolChar(S_ELLIPSIS, draw,
2896 
							mc, gc, dd));
27236 murrell 2897 
	    bbox = CombineBBoxes(bbox, RenderGap(small, draw, mc, gc, dd));
2028 ihaka 2898 
	}
2899 
	else {
2900 
	    if (i > 0) {
32392 ripley 2901 
		bbox = CombineBBoxes(bbox, RenderSymbolChar(S_COMMA, draw,
2902 
							    mc, gc, dd));
2903 
		bbox = CombineBBoxes(bbox, RenderSymbolChar(S_SPACE, draw,
2904 
							    mc, gc, dd));
2028 ihaka 2905 
	    }
32392 ripley 2906 
	    bbox = CombineBBoxes(bbox, RenderElement(CAR(expr), draw, mc,
2907 
						     gc, dd));
2028 ihaka 2908 
	}
2909 
	expr = CDR(expr);
2910 
    }
2911 
    return bbox;
2 r 2912 
}
2913 
 
2028 ihaka 2914 
/*----------------------------------------------------------------------
2915 
 *
2916 
 *  Code for General Expressions
2917 
 *
2918 
 */
2 r 2919 
 
32392 ripley 2920 
static BBOX RenderExpression(SEXP expr, int draw, mathContext *mc,
2921 
			     R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2922 
{
2028 ihaka 2923 
    BBOX bbox;
2924 
    if (NameAtom(CAR(expr)))
27236 murrell 2925 
	bbox = RenderSymbolString(CAR(expr), draw, mc, gc, dd);
2028 ihaka 2926 
    else
27236 murrell 2927 
	bbox = RenderElement(CAR(expr), draw, mc, gc, dd);
2928 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2929 
    bbox = CombineBBoxes(bbox, RenderDelimiter(S_PARENLEFT, draw, mc, gc, dd));
2930 
    bbox = CombineBBoxes(bbox, RenderCommaList(CDR(expr), draw, mc, gc, dd));
2931 
    bbox = RenderItalicCorr(bbox, draw, mc, gc, dd);
2932 
    bbox = CombineBBoxes(bbox, RenderDelimiter(S_PARENRIGHT, draw, mc, gc, dd));
2028 ihaka 2933 
    return bbox;
2 r 2934 
}
2935 
 
2028 ihaka 2936 
/*----------------------------------------------------------------------
2937 
 *
2938 
 *  Code for Comma Separated List Expressions
2939 
 *
2940 
 */
2 r 2941 
 
2028 ihaka 2942 
static int ListAtom(SEXP expr)
2 r 2943 
{
2028 ihaka 2944 
    return NameAtom(expr) && NameMatch(expr, "list");
2 r 2945 
}
2946 
 
32392 ripley 2947 
static BBOX RenderList(SEXP expr, int draw, mathContext *mc,
2948 
		       R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2949 
{
27236 murrell 2950 
    return RenderCommaList(CDR(expr), draw, mc, gc, dd);
2 r 2951 
}
2952 
 
1839 ihaka 2953 
/* Dispatching procedure which determines nature of expression. */
2 r 2954 
 
2028 ihaka 2955 
 
32392 ripley 2956 
static BBOX RenderFormula(SEXP expr, int draw, mathContext *mc,
2957 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2 r 2958 
{
1839 ihaka 2959 
    SEXP head = CAR(expr);
2 r 2960 
 
2028 ihaka 2961 
    if (SpaceAtom(head))
27236 murrell 2962 
	return RenderSpace(expr, draw, mc, gc, dd);
2028 ihaka 2963 
    else if (BinAtom(head))
27236 murrell 2964 
	return RenderBin(expr, draw, mc, gc, dd);
2028 ihaka 2965 
    else if (SuperAtom(head))
27236 murrell 2966 
	return RenderSup(expr, draw, mc, gc, dd);
2028 ihaka 2967 
    else if (SubAtom(head))
27236 murrell 2968 
	return RenderSub(expr, draw, mc, gc, dd);
2028 ihaka 2969 
    else if (WideTildeAtom(head))
27236 murrell 2970 
	return RenderWideTilde(expr, draw, mc, gc, dd);
2028 ihaka 2971 
    else if (WideHatAtom(head))
27236 murrell 2972 
	return RenderWideHat(expr, draw, mc, gc, dd);
2028 ihaka 2973 
    else if (BarAtom(head))
27236 murrell 2974 
	return RenderBar(expr, draw, mc, gc, dd);
2028 ihaka 2975 
    else if (AccentAtom(head))
27236 murrell 2976 
	return RenderAccent(expr, draw, mc, gc, dd);
2028 ihaka 2977 
    else if (OverAtom(head))
27236 murrell 2978 
	return RenderOver(expr, draw, mc, gc, dd);
31430 ripley 2979 
    else if (UnderlAtom(head))
2980 
        return RenderUnderl(expr, draw, mc, gc, dd);
2028 ihaka 2981 
    else if (AtopAtom(head))
27236 murrell 2982 
	return RenderAtop(expr, draw, mc, gc, dd);
2028 ihaka 2983 
    else if (ParenAtom(head))
27236 murrell 2984 
	return RenderParen(expr, draw, mc, gc, dd);
2028 ihaka 2985 
    else if (BGroupAtom(head))
27236 murrell 2986 
	return RenderBGroup(expr, draw, mc, gc, dd);
2028 ihaka 2987 
    else if (GroupAtom(head))
27236 murrell 2988 
	return RenderGroup(expr, draw, mc, gc, dd);
2028 ihaka 2989 
    else if (IntAtom(head))
27236 murrell 2990 
	return RenderInt(expr, draw, mc, gc, dd);
2028 ihaka 2991 
    else if (OpAtom(head))
27236 murrell 2992 
	return RenderOp(expr, draw, mc, gc, dd);
2028 ihaka 2993 
    else if (RadicalAtom(head))
27236 murrell 2994 
	return RenderRadical(expr, draw, mc, gc, dd);
2028 ihaka 2995 
    else if (AbsAtom(head))
27236 murrell 2996 
	return RenderAbs(expr, draw, mc, gc, dd);
2028 ihaka 2997 
    else if (CurlyAtom(head))
27236 murrell 2998 
	return RenderCurly(expr, draw, mc, gc, dd);
2028 ihaka 2999 
    else if (RelAtom(head))
27236 murrell 3000 
	return RenderRel(expr, draw, mc, gc, dd);
2028 ihaka 3001 
    else if (BoldAtom(head))
27236 murrell 3002 
	return RenderBold(expr, draw, mc, gc, dd);
2028 ihaka 3003 
    else if (ItalicAtom(head))
27236 murrell 3004 
	return RenderItalic(expr, draw, mc, gc, dd);
2028 ihaka 3005 
    else if (PlainAtom(head))
27236 murrell 3006 
	return RenderPlain(expr, draw, mc, gc, dd);
2028 ihaka 3007 
    else if (BoldItalicAtom(head))
27236 murrell 3008 
	return RenderBoldItalic(expr, draw, mc, gc, dd);
2028 ihaka 3009 
    else if (StyleAtom(head))
27236 murrell 3010 
	return RenderStyle(expr, draw, mc, gc, dd);
2028 ihaka 3011 
    else if (PhantomAtom(head))
27236 murrell 3012 
	return RenderPhantom(expr, draw, mc, gc, dd);
2028 ihaka 3013 
    else if (ConcatenateAtom(head))
27236 murrell 3014 
	return RenderConcatenate(expr, draw, mc, gc, dd);
2028 ihaka 3015 
    else if (ListAtom(head))
27236 murrell 3016 
	return RenderList(expr, draw, mc, gc, dd);
1839 ihaka 3017 
    else
27236 murrell 3018 
	return RenderExpression(expr, draw, mc, gc, dd);
2 r 3019 
}
3020 
 
3021 
 
2028 ihaka 3022 
/* Dispatch on whether atom (symbol, string, number, ...) */
3023 
/* or formula (some sort of expression) */
2 r 3024 
 
32392 ripley 3025 
static BBOX RenderElement(SEXP expr, int draw, mathContext *mc,
3026 
			  R_GE_gcontext *gc, GEDevDesc *dd)
2028 ihaka 3027 
{
3028 
    if (FormulaExpression(expr))
27236 murrell 3029 
	return RenderFormula(expr, draw, mc, gc, dd);
1839 ihaka 3030 
    else
27236 murrell 3031 
	return RenderAtom(expr, draw, mc, gc, dd);
2 r 3032 
}
3033 
 
32392 ripley 3034 
static BBOX RenderOffsetElement(SEXP expr, double x, double y, int draw,
3035 
				mathContext *mc, R_GE_gcontext *gc,
3036 
				GEDevDesc *dd)
2028 ihaka 3037 
{
3038 
    BBOX bbox;
27236 murrell 3039 
    double savedX = mc->CurrentX;
3040 
    double savedY = mc->CurrentY;
2028 ihaka 3041 
    if (draw) {
27236 murrell 3042 
	mc->CurrentX += x;
3043 
	mc->CurrentY += y;
2028 ihaka 3044 
    }
27236 murrell 3045 
    bbox = RenderElement(expr, draw, mc, gc, dd);
2028 ihaka 3046 
    bboxWidth(bbox) += x;
3047 
    bboxHeight(bbox) += y;
3048 
    bboxDepth(bbox) -= y;
27236 murrell 3049 
    mc->CurrentX = savedX;
3050 
    mc->CurrentY = savedY;
2028 ihaka 3051 
    return bbox;
2 r 3052 
 
3053 
}
3054 
 
19875 murrell 3055 
/* Functions forming the R API */
3056 
 
2028 ihaka 3057 
/* Calculate width of expression */
3058 
/* BBOXes are in INCHES (see MetricUnit) */
3059 
 
32392 ripley 3060 
double GEExpressionWidth(SEXP expr,
27236 murrell 3061 
			 R_GE_gcontext *gc,
19875 murrell 3062 
			 GEDevDesc *dd)
2 r 3063 
{
2679 pd 3064 
    BBOX bbox;
3065 
    double width;
27236 murrell 3066 
 
3067 
    /*
3068 
     * Build a "drawing context" for the current expression
3069 
     */
3070 
    mathContext mc;
3071 
    mc.BaseCex = gc->cex;
3072 
    mc.BoxColor = name2col("pink");
3073 
    mc.CurrentStyle = STYLE_D;
3074 
    /*
3075 
     * Some "empty" values.  Will be filled in after BBox is calc'ed
3076 
     */
3077 
    mc.ReferenceX = 0;
3078 
    mc.ReferenceY = 0;
3079 
    mc.CurrentX = 0;
3080 
    mc.CurrentY = 0;
3081 
    mc.CurrentAngle = 0;
3082 
    mc.CosAngle = 0;
3083 
    mc.SinAngle = 0;
3084 
 
3085 
    SetFont(PlainFont, gc);
3086 
    bbox = RenderElement(expr, 0, &mc, gc, dd);
2679 pd 3087 
    width  = bboxWidth(bbox);
32392 ripley 3088 
    /*
20257 murrell 3089 
     * NOTE that we do fabs() here in case the device
3090 
     * runs right-to-left.
3091 
     * This is so that these calculations match those
3092 
     * for string widths and heights, where the width
3093 
     * and height of text is positive no matter how
3094 
     * the device drawing is oriented.
3095 
     */
3096 
    return fabs(toDeviceWidth(width, GE_INCHES, dd));
257 paul 3097 
}
3098 
 
32392 ripley 3099 
double GEExpressionHeight(SEXP expr,
27236 murrell 3100 
			  R_GE_gcontext *gc,
19875 murrell 3101 
			  GEDevDesc *dd)
257 paul 3102 
{
2679 pd 3103 
    BBOX bbox;
3104 
    double height;
27236 murrell 3105 
 
3106 
    /*
3107 
     * Build a "drawing context" for the current expression
3108 
     */
3109 
    mathContext mc;
3110 
    mc.BaseCex = gc->cex;
3111 
    mc.BoxColor = name2col("pink");
3112 
    mc.CurrentStyle = STYLE_D;
3113 
    /*
3114 
     * Some "empty" values.  Will be filled in after BBox is calc'ed
3115 
     */
3116 
    mc.ReferenceX = 0;
3117 
    mc.ReferenceY = 0;
3118 
    mc.CurrentX = 0;
3119 
    mc.CurrentY = 0;
3120 
    mc.CurrentAngle = 0;
3121 
    mc.CosAngle = 0;
3122 
    mc.SinAngle = 0;
3123 
 
3124 
    SetFont(PlainFont, gc);
3125 
    bbox = RenderElement(expr, 0, &mc, gc, dd);
2679 pd 3126 
    height = bboxHeight(bbox) + bboxDepth(bbox);
20257 murrell 3127 
    /* NOTE that we do fabs() here in case the device
3128 
     * draws top-to-bottom (like an X11 window).
3129 
     * This is so that these calculations match those
3130 
     * for string widths and heights, where the width
3131 
     * and height of text is positive no matter how
3132 
     * the device drawing is oriented.
3133 
     */
3134 
    return fabs(toDeviceHeight(height, GE_INCHES, dd));
257 paul 3135 
}
3136 
 
19875 murrell 3137 
void GEMathText(double x, double y, SEXP expr,
32392 ripley 3138 
		double xc, double yc, double rot,
27236 murrell 3139 
		R_GE_gcontext *gc,
19875 murrell 3140 
		GEDevDesc *dd)
2 r 3141 
{
2028 ihaka 3142 
    BBOX bbox;
27236 murrell 3143 
    mathContext mc;
6098 pd 3144 
 
3145 
#ifdef BUG61
3146 
#else
3147 
    /* IF font metric information is not available for device */
3148 
    /* then bail out */
3149 
    double ascent, descent, width;
27236 murrell 3150 
    GEMetricInfo(0, gc,
19875 murrell 3151 
		&ascent, &descent, &width, dd);
6098 pd 3152 
    if ((ascent==0) && (descent==0) && (width==0))
32871 ripley 3153 
	error(_("Metric information not available for this device"));
6098 pd 3154 
#endif
3155 
 
27236 murrell 3156 
    /*
3157 
     * Build a "drawing context" for the current expression
21062 murrell 3158 
     */
27236 murrell 3159 
    mc.BaseCex = gc->cex;
3160 
    mc.BoxColor = name2col("pink");
3161 
    mc.CurrentStyle = STYLE_D;
3162 
    /*
3163 
     * Some "empty" values.  Will be filled in after BBox is calc'ed
3164 
     */
3165 
    mc.ReferenceX = 0;
3166 
    mc.ReferenceY = 0;
3167 
    mc.CurrentX = 0;
3168 
    mc.CurrentY = 0;
3169 
    mc.CurrentAngle = 0;
3170 
    mc.CosAngle = 0;
3171 
    mc.SinAngle = 0;
3172 
 
3173 
    SetFont(PlainFont, gc);
3174 
    bbox = RenderElement(expr, 0, &mc, gc, dd);
3175 
    mc.ReferenceX = fromDeviceX(x, GE_INCHES, dd);
3176 
    mc.ReferenceY = fromDeviceY(y, GE_INCHES, dd);
5107 maechler 3177 
    if (R_FINITE(xc))
27236 murrell 3178 
	mc.CurrentX = mc.ReferenceX - xc * bboxWidth(bbox);
2028 ihaka 3179 
    else
18202 murrell 3180 
	/* Paul 11/2/02
3181 
	 * If xc == NA then should centre horizontally.
3182 
	 * Used to left-adjust.
3183 
	 */
27236 murrell 3184 
	mc.CurrentX = mc.ReferenceX - 0.5 * bboxWidth(bbox);
5107 maechler 3185 
    if (R_FINITE(yc))
27236 murrell 3186 
	mc.CurrentY = mc.ReferenceY + bboxDepth(bbox)
2028 ihaka 3187 
	    - yc * (bboxHeight(bbox) + bboxDepth(bbox));
3188 
    else
18202 murrell 3189 
	/* Paul 11/2/02
3190 
	 * If xc == NA then should centre vertically.
3191 
	 * Used to bottom-adjust.
3192 
	 */
27236 murrell 3193 
	mc.CurrentY = mc.ReferenceY + bboxDepth(bbox)
18202 murrell 3194 
	    - 0.5 * (bboxHeight(bbox) + bboxDepth(bbox));
27236 murrell 3195 
    mc.CurrentAngle = rot;
7527 maechler 3196 
    rot *= M_PI_2 / 90 ;/* radians */
27236 murrell 3197 
    mc.CosAngle = cos(rot);
3198 
    mc.SinAngle = sin(rot);
3199 
    RenderElement(expr, 1, &mc, gc, dd);
10886 maechler 3200 
}/* GMathText */
2 r 3201 
 
3202 
 
19875 murrell 3203 
/********************************
3204 
 * Code below here ...
32392 ripley 3205 
 * ... should be moved to base.c and
19875 murrell 3206 
 * ... is part of the base graphics API NOT the graphics engine API
3207 
 ********************************
3208 
 */
3209 
double GExpressionWidth(SEXP expr, GUnit units, DevDesc *dd)
3210 
{
27236 murrell 3211 
    R_GE_gcontext gc;
32392 ripley 3212 
    double width;
27236 murrell 3213 
    gcontextFromGP(&gc, dd);
3214 
    width = GEExpressionWidth(expr, &gc, (GEDevDesc*) dd);
19875 murrell 3215 
    if (units == DEVICE)
3216 
	return width;
3217 
    else
3218 
	return GConvertXUnits(width, DEVICE, units, dd);
3219 
}
3220 
 
3221 
double GExpressionHeight(SEXP expr, GUnit units, DevDesc *dd)
3222 
{
27236 murrell 3223 
    R_GE_gcontext gc;
3224 
    double height;
3225 
    gcontextFromGP(&gc, dd);
3226 
    height = GEExpressionHeight(expr, &gc, (GEDevDesc*) dd);
19875 murrell 3227 
    if (units == DEVICE)
3228 
	return height;
3229 
    else
3230 
	return GConvertYUnits(height, DEVICE, units, dd);
3231 
}
3232 
 
19876 murrell 3233 
/* This is just here to satisfy the Rgraphics.h API.
32392 ripley 3234 
 * This allows new graphics API (GraphicsDevice.h, GraphicsEngine.h)
19876 murrell 3235 
 * to be developed alongside.
3236 
 * Could be removed if Rgraphics.h ever gets REPLACED by new API
3237 
 * NOTE that base graphics code no longer calls this -- the base
3238 
 * graphics system directly calls the graphics engine for mathematical
3239 
 * annotation (GEMathText)
3240 
 */
3241 
void GMathText(double x, double y, int coords, SEXP expr,
32392 ripley 3242 
	       double xc, double yc, double rot,
19876 murrell 3243 
	       DevDesc *dd)
3244 
{
27236 murrell 3245 
    R_GE_gcontext gc;
3246 
    gcontextFromGP(&gc, dd);
19876 murrell 3247 
    GConvert(&x, &y, coords, DEVICE, dd);
20197 murrell 3248 
    GClip(dd);
27236 murrell 3249 
    GEMathText(x, y, expr, xc, yc, rot, &gc, (GEDevDesc*) dd);
19876 murrell 3250 
}
3251 
 
2028 ihaka 3252 
void GMMathText(SEXP str, int side, double line, int outer,
30998 murrell 3253 
		double at, int las, double yadj, DevDesc *dd)
2 r 3254 
{
13400 hornik 3255 
    int coords = 0, subcoords;
30998 murrell 3256 
    double xadj, angle = 0;
2 r 3257 
 
6098 pd 3258 
#ifdef BUG61
3259 
#else
3260 
    /* IF font metric information is not available for device */
3261 
    /* then bail out */
3262 
    double ascent, descent, width;
3263 
    GMetricInfo(0, &ascent, &descent, &width, DEVICE, dd);
3264 
    if ((ascent==0) && (descent==0) && (width==0))
32871 ripley 3265 
	error(_("Metric information not available for this device"));
6098 pd 3266 
#endif
3267 
 
19875 murrell 3268 
    xadj = Rf_gpptr(dd)->adj;
12841 murrell 3269 
 
3270 
    /* This is MOSTLY the same as the same section of GMtext
3271 
     * BUT it differs because it sets different values for yadj for
3272 
     * different situations.
3273 
     * Paul
3274 
     */
30998 murrell 3275 
     /* changed to unify behaviour with changes in GMText. Uwe */
12841 murrell 3276 
    if(outer) {
3277 
	switch(side) {
3278 
	case 1:	    coords = OMA1;	break;
3279 
	case 2:	    coords = OMA2;	break;
3280 
	case 3:	    coords = OMA3;	break;
3281 
	case 4:	    coords = OMA4;	break;
2 r 3282 
	}
12841 murrell 3283 
	subcoords = NIC;
1839 ihaka 3284 
    }
3285 
    else {
12841 murrell 3286 
	switch(side) {
3287 
	case 1:	    coords = MAR1;	break;
3288 
	case 2:	    coords = MAR2;	break;
3289 
	case 3:	    coords = MAR3;	break;
3290 
	case 4:	    coords = MAR4;	break;
2 r 3291 
	}
12841 murrell 3292 
	subcoords = USER;
1839 ihaka 3293 
    }
17179 murrell 3294 
    /* Note: I changed Rf_gpptr(dd)->yLineBias to 0.3 here. */
12841 murrell 3295 
    /* Purely visual tuning. RI */
16224 maechler 3296 
    /* Note: I removed the 0.3 fiddle here because mathematical
15168 pd 3297 
     * annotation stuff can do "exact" centering.
3298 
     * i.e., 0.3 fiddle is effectively replaced by yadj=0.5
3299 
     */
12841 murrell 3300 
    switch(side) {
3301 
    case 1:
3302 
	if(las == 2 || las == 3) {
3303 
	    angle = 90;
3304 
	}
3305 
	else {
18202 murrell 3306 
	    /*	    line = line + 1 - Rf_gpptr(dd)->yLineBias;
3307 
		    angle = 0;
3308 
		    yadj = NA_REAL; */
3309 
	    line = line + 1;
12841 murrell 3310 
	    angle = 0;
3311 
	}
3312 
	break;
3313 
    case 2:
3314 
	if(las == 1 || las == 2) {
3315 
	    angle = 0;
3316 
	}
3317 
	else {
18202 murrell 3318 
	    /*	    line = line + Rf_gpptr(dd)->yLineBias;
3319 
		    angle = 90;
3320 
		    yadj = NA_REAL; */
12841 murrell 3321 
	    angle = 90;
3322 
	}
3323 
	break;
3324 
    case 3:
3325 
	if(las == 2 || las == 3) {
3326 
	    angle = 90;
3327 
	}
3328 
	else {
18202 murrell 3329 
	    /*   line = line + Rf_gpptr(dd)->yLineBias;
3330 
		 angle = 0;
3331 
		 yadj = NA_REAL; */
12841 murrell 3332 
	    angle = 0;
3333 
	}
3334 
	break;
3335 
    case 4:
3336 
	if(las == 1 || las == 2) {
3337 
	    angle = 0;
3338 
	}
3339 
	else {
18202 murrell 3340 
	    /*   line = line + 1 - Rf_gpptr(dd)->yLineBias;
3341 
		 angle = 90;
3342 
		 yadj = NA_REAL; */
3343 
	    line = line + 1;
12841 murrell 3344 
	    angle = 90;
3345 
	}
3346 
	break;
3347 
    }
27236 murrell 3348 
    GMathText(at, line, coords, str, xadj, yadj, angle, dd);
10886 maechler 3349 
}/* GMMathText */