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/*
 *  A PicTeX device, (C) 1996 Valerio Aimale, for
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "Graphics.h"
#include "Fileio.h"

    /* device-specific information per picTeX device */

typedef struct {
    FILE *texfp;
    char filename[128];
    int pageno;
    int landscape;
    double width;
    double height;
    double pagewidth;
    double pageheight;
    double xlast;
    double ylast;
    double clipleft, clipright, cliptop, clipbottom;
    double clippedx0, clippedy0, clippedx1, clippedy1;
    int lty;
    rcolor col;
    rcolor fg;
    rcolor bg;
    int fontsize;
    int fontface;
    int debug;
} picTeXDesc;


    /* Global device information */

static double charwidth[4][128] = {
{
  0.5416690, 0.8333360, 0.7777810, 0.6111145, 0.6666690, 0.7083380, 0.7222240,
  0.7777810, 0.7222240, 0.7777810, 0.7222240, 0.5833360, 0.5361130, 0.5361130,
  0.8138910, 0.8138910, 0.2388900, 0.2666680, 0.5000020, 0.5000020, 0.5000020,
  0.5000020, 0.5000020, 0.6666700, 0.4444460, 0.4805580, 0.7222240, 0.7777810,
  0.5000020, 0.8611145, 0.9722260, 0.7777810, 0.2388900, 0.3194460, 0.5000020,
  0.8333360, 0.5000020, 0.8333360, 0.7583360, 0.2777790, 0.3888900, 0.3888900,
  0.5000020, 0.7777810, 0.2777790, 0.3333340, 0.2777790, 0.5000020, 0.5000020,
  0.5000020, 0.5000020, 0.5000020, 0.5000020, 0.5000020, 0.5000020, 0.5000020,
  0.5000020, 0.5000020, 0.2777790, 0.2777790, 0.3194460, 0.7777810, 0.4722240,
  0.4722240, 0.6666690, 0.6666700, 0.6666700, 0.6388910, 0.7222260, 0.5972240,
  0.5694475, 0.6666690, 0.7083380, 0.2777810, 0.4722240, 0.6944480, 0.5416690,
  0.8750050, 0.7083380, 0.7361130, 0.6388910, 0.7361130, 0.6458360, 0.5555570,
  0.6805570, 0.6875050, 0.6666700, 0.9444480, 0.6666700, 0.6666700, 0.6111130,
  0.2888900, 0.5000020, 0.2888900, 0.5000020, 0.2777790, 0.2777790, 0.4805570,
  0.5166680, 0.4444460, 0.5166680, 0.4444460, 0.3055570, 0.5000020, 0.5166680,
  0.2388900, 0.2666680, 0.4888920, 0.2388900, 0.7944470, 0.5166680, 0.5000020,
  0.5166680, 0.5166680, 0.3416690, 0.3833340, 0.3611120, 0.5166680, 0.4611130,
  0.6833360, 0.4611130, 0.4611130, 0.4347230, 0.5000020, 1.0000030, 0.5000020,
  0.5000020, 0.5000020
},
{
  0.5805590, 0.9166720, 0.8555600, 0.6722260, 0.7333370, 0.7944490, 0.7944490,
  0.8555600, 0.7944490, 0.8555600, 0.7944490, 0.6416700, 0.5861150, 0.5861150,
  0.8916720, 0.8916720, 0.2555570, 0.2861130, 0.5500030, 0.5500030, 0.5500030,
  0.5500030, 0.5500030, 0.7333370, 0.4888920, 0.5652800, 0.7944490, 0.8555600,
  0.5500030, 0.9472275, 1.0694500, 0.8555600, 0.2555570, 0.3666690, 0.5583360,
  0.9166720, 0.5500030, 1.0291190, 0.8305610, 0.3055570, 0.4277800, 0.4277800,
  0.5500030, 0.8555600, 0.3055570, 0.3666690, 0.3055570, 0.5500030, 0.5500030,
  0.5500030, 0.5500030, 0.5500030, 0.5500030, 0.5500030, 0.5500030, 0.5500030,
  0.5500030, 0.5500030, 0.3055570, 0.3055570, 0.3666690, 0.8555600, 0.5194470,
  0.5194470, 0.7333370, 0.7333370, 0.7333370, 0.7027820, 0.7944490, 0.6416700,
  0.6111145, 0.7333370, 0.7944490, 0.3305570, 0.5194470, 0.7638930, 0.5805590,
  0.9777830, 0.7944490, 0.7944490, 0.7027820, 0.7944490, 0.7027820, 0.6111145,
  0.7333370, 0.7638930, 0.7333370, 1.0388950, 0.7333370, 0.7333370, 0.6722260,
  0.3430580, 0.5583360, 0.3430580, 0.5500030, 0.3055570, 0.3055570, 0.5250030,
  0.5611140, 0.4888920, 0.5611140, 0.5111140, 0.3361130, 0.5500030, 0.5611140,
  0.2555570, 0.2861130, 0.5305590, 0.2555570, 0.8666720, 0.5611140, 0.5500030,
  0.5611140, 0.5611140, 0.3722250, 0.4216690, 0.4041690, 0.5611140, 0.5000030,
  0.7444490, 0.5000030, 0.5000030, 0.4763920, 0.5500030, 1.1000060, 0.5500030,
  0.5500030, 0.550003 },
{
  0.5416690, 0.8333360, 0.7777810, 0.6111145, 0.6666690, 0.7083380, 0.7222240,
  0.7777810, 0.7222240, 0.7777810, 0.7222240, 0.5833360, 0.5361130, 0.5361130,
  0.8138910, 0.8138910, 0.2388900, 0.2666680, 0.5000020, 0.5000020, 0.5000020,
  0.5000020, 0.5000020, 0.7375210, 0.4444460, 0.4805580, 0.7222240, 0.7777810,
  0.5000020, 0.8611145, 0.9722260, 0.7777810, 0.2388900, 0.3194460, 0.5000020,
  0.8333360, 0.5000020, 0.8333360, 0.7583360, 0.2777790, 0.3888900, 0.3888900,
  0.5000020, 0.7777810, 0.2777790, 0.3333340, 0.2777790, 0.5000020, 0.5000020,
  0.5000020, 0.5000020, 0.5000020, 0.5000020, 0.5000020, 0.5000020, 0.5000020,
  0.5000020, 0.5000020, 0.2777790, 0.2777790, 0.3194460, 0.7777810, 0.4722240,
  0.4722240, 0.6666690, 0.6666700, 0.6666700, 0.6388910, 0.7222260, 0.5972240,
  0.5694475, 0.6666690, 0.7083380, 0.2777810, 0.4722240, 0.6944480, 0.5416690,
  0.8750050, 0.7083380, 0.7361130, 0.6388910, 0.7361130, 0.6458360, 0.5555570,
  0.6805570, 0.6875050, 0.6666700, 0.9444480, 0.6666700, 0.6666700, 0.6111130,
  0.2888900, 0.5000020, 0.2888900, 0.5000020, 0.2777790, 0.2777790, 0.4805570,
  0.5166680, 0.4444460, 0.5166680, 0.4444460, 0.3055570, 0.5000020, 0.5166680,
  0.2388900, 0.2666680, 0.4888920, 0.2388900, 0.7944470, 0.5166680, 0.5000020,
  0.5166680, 0.5166680, 0.3416690, 0.3833340, 0.3611120, 0.5166680, 0.4611130,
  0.6833360, 0.4611130, 0.4611130, 0.4347230, 0.5000020, 1.0000030, 0.5000020,
  0.5000020, 0.5000020 },
{
  0.5805590, 0.9166720, 0.8555600, 0.6722260, 0.7333370, 0.7944490, 0.7944490,
  0.8555600, 0.7944490, 0.8555600, 0.7944490, 0.6416700, 0.5861150, 0.5861150,
  0.8916720, 0.8916720, 0.2555570, 0.2861130, 0.5500030, 0.5500030, 0.5500030,
  0.5500030, 0.5500030, 0.8002530, 0.4888920, 0.5652800, 0.7944490, 0.8555600,
  0.5500030, 0.9472275, 1.0694500, 0.8555600, 0.2555570, 0.3666690, 0.5583360,
  0.9166720, 0.5500030, 1.0291190, 0.8305610, 0.3055570, 0.4277800, 0.4277800,
  0.5500030, 0.8555600, 0.3055570, 0.3666690, 0.3055570, 0.5500030, 0.5500030,
  0.5500030, 0.5500030, 0.5500030, 0.5500030, 0.5500030, 0.5500030, 0.5500030,
  0.5500030, 0.5500030, 0.3055570, 0.3055570, 0.3666690, 0.8555600, 0.5194470,
  0.5194470, 0.7333370, 0.7333370, 0.7333370, 0.7027820, 0.7944490, 0.6416700,
  0.6111145, 0.7333370, 0.7944490, 0.3305570, 0.5194470, 0.7638930, 0.5805590,
  0.9777830, 0.7944490, 0.7944490, 0.7027820, 0.7944490, 0.7027820, 0.6111145,
  0.7333370, 0.7638930, 0.7333370, 1.0388950, 0.7333370, 0.7333370, 0.6722260,
  0.3430580, 0.5583360, 0.3430580, 0.5500030, 0.3055570, 0.3055570, 0.5250030,
  0.5611140, 0.4888920, 0.5611140, 0.5111140, 0.3361130, 0.5500030, 0.5611140,
  0.2555570, 0.2861130, 0.5305590, 0.2555570, 0.8666720, 0.5611140, 0.5500030,
  0.5611140, 0.5611140, 0.3722250, 0.4216690, 0.4041690, 0.5611140, 0.5000030,
  0.7444490, 0.5000030, 0.5000030, 0.4763920, 0.5500030, 1.1000060, 0.5500030,
  0.5500030, 0.550003
}
};

static char *fontname[] = {
    "cmss10",
    "cmssbx10",
    "cmssi10",
    "cmssxi10"
};


    /* Device driver actions */

static void   PicTeX_Activate(DevDesc *);
static void   PicTeX_Circle(double, double, int, double, int, int, DevDesc*);
static void   PicTeX_Clip(double, double, double, double, DevDesc*);
static void   PicTeX_Close(DevDesc*);
static void   PicTeX_Deactivate(DevDesc *);
static void   PicTeX_Hold(DevDesc*);
static void   PicTeX_Line(double, double, double, double, int, DevDesc*);
static int    PicTeX_Locator(double*, double*, DevDesc*);
static void   PicTeX_Mode(int, DevDesc*);
static void   PicTeX_NewPage(DevDesc*);
static int    PicTeX_Open(DevDesc*, picTeXDesc*);
static void   PicTeX_Polygon(int, double*, double*, int, int, int, DevDesc*);
static void   PicTeX_Polyline(int, double*, double*, int, DevDesc*);
static void   PicTeX_Rect(double, double, double, double, int, int, int,
              DevDesc*);
static void   PicTeX_Resize(DevDesc*);
static double PicTeX_StrWidth(char*, DevDesc*);
static void   PicTeX_Text(double, double, int, char*, double, double, DevDesc*);
static void   PicTeX_MetricInfo(int, double*, double*, double*, DevDesc*);

    /* Support routines */

static void SetLinetype(int newlty, int newlwd, DevDesc *dd)
{
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    int i, templty;
    ptd->lty = newlty;
    if (ptd->lty) {
    fprintf(ptd->texfp,"\\setdashpattern <");
    for(i=0 ; i<8 && newlty&15 ; i++) {
        fprintf(ptd->texfp,"%dpt", newlwd * newlty&15);
        templty = newlty>>4;
        if ((i+1)<8 && templty&15) fprintf(ptd->texfp,", ");
        newlty = newlty>>4;
    }
    fprintf(ptd->texfp,">\n");
    } else fprintf(ptd->texfp,"\\setsolid\n");
}


static void SetFont(int face, int size, picTeXDesc *ptd)
{
    int lface=face, lsize= size;
    if(lface < 1 || lface > 4) lface = 1;
    if(lsize < 1 || lsize > 24) lsize = 10;
    if(lsize != ptd->fontsize || lface != ptd->fontface) {
    fprintf(ptd->texfp, "\\font\\picfont %s at %dpt\\picfont\n",
        fontname[lface-1], lsize);
    ptd->fontsize = lsize;
    ptd->fontface = lface;
    }
}

static void PicTeX_Activate(DevDesc *dd)
{
}

static void PicTeX_Deactivate(DevDesc *dd)
{
}

static void PicTeX_MetricInfo(int c, double *ascent, double *descent,
                  double *width, DevDesc *dd)
{
    /* metric information not available => return 0,0,0 */
    *ascent = 0.0;
    *descent = 0.0;
    *width = 0.0;
}

    /* Initialize the device */

static int PicTeX_Open(DevDesc *dd, picTeXDesc *ptd)
{
    ptd->fontsize = 0;
    ptd->fontface = 0;
    ptd->debug = 0;
    if (!(ptd->texfp = R_fopen(R_ExpandFileName(ptd->filename), "w")))
    return 0;
    fprintf(ptd->texfp, "\\hbox{\\beginpicture\n");
    fprintf(ptd->texfp, "\\setcoordinatesystem units <1pt,1pt>\n");
    fprintf(ptd->texfp,
        "\\setplotarea x from 0 to %.2f, y from 0 to %.2f\n",
        ptd->width * 72.27, ptd->height * 72.27);
    fprintf(ptd->texfp,"\\setlinear\n");
    fprintf(ptd->texfp, "\\font\\picfont cmss10\\picfont\n");
    SetFont(1, 10, ptd);
    ptd->pageno += 1;
    return 1;
}


    /* Interactive Resize */

static void PicTeX_Resize(DevDesc *dd)
{
}

static void PicTeX_Clip(double x0, double x1, double y0, double y1,
            DevDesc *dd)
{
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    if(ptd->debug)
    fprintf(ptd->texfp, "%% Setting Clip Region to %.2f %.2f %.2f %.2f\n",
        x0, y0, x1, y1);
    ptd->clipleft = x0;
    ptd->clipright = x1;
    ptd->clipbottom = y0;
    ptd->cliptop = y1;
}

    /* Start a new page */

static void PicTeX_NewPage(DevDesc *dd)
{
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    int face, size;
    if (ptd->pageno) {
    fprintf(ptd->texfp, "\\endpicture\n}\n\n\n");
    fprintf(ptd->texfp, "\\hbox{\\beginpicture\n");
    fprintf(ptd->texfp, "\\setcoordinatesystem units <1pt,1pt>\n");
    fprintf(ptd->texfp,
        "\\setplotarea x from 0 to %.2f, y from 0 to %.2f\n",
        ptd->width * 72.27, ptd->height * 72.27);
    fprintf(ptd->texfp,"\\setlinear\n");
    fprintf(ptd->texfp, "\\font\\picfont cmss10\\picfont\n");
    }
    ptd->pageno +=1;
    face = ptd->fontface;
    size = ptd->fontsize;
    ptd->fontface = 0;
    ptd->fontsize = 0;
    SetFont(face, size, ptd);
}

    /* Close down the driver */

static void PicTeX_Close(DevDesc *dd)
{
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    fprintf(ptd->texfp, "\\endpicture\n}\n");
    fclose(ptd->texfp);

    free(ptd);
}


    /* Seek */
/* NO LONGER USED
static void PicTeX_MoveTo(double x, double y)
{
    xlast = x;
    ylast = y;
}
*/

    /* Draw To */

static void PicTeX_ClipLine(double x0, double y0, double x1, double y1,
                picTeXDesc *ptd)
{
    ptd->clippedx0 = x0; ptd->clippedx1 = x1;
    ptd->clippedy0 = y0; ptd->clippedy1 = y1;

    if ((ptd->clippedx0 < ptd->clipleft &&
     ptd->clippedx1 < ptd->clipleft) ||
    (ptd->clippedx0 > ptd->clipright &&
     ptd->clippedx1 > ptd->clipright) ||
    (ptd->clippedy0 < ptd->clipbottom &&
     ptd->clippedy1 < ptd->clipbottom) ||
    (ptd->clippedy0 > ptd->cliptop &&
     ptd->clippedy1 > ptd->cliptop)) {
    ptd->clippedx0 = ptd->clippedx1;
    ptd->clippedy0 = ptd->clippedy1;
    return;
    }

    /*Clipping Left */
    if (ptd->clippedx1 >= ptd->clipleft && ptd->clippedx0 < ptd->clipleft) {
    ptd->clippedy0 = ((ptd->clippedy1-ptd->clippedy0) /
              (ptd->clippedx1-ptd->clippedx0) *
              (ptd->clipleft-ptd->clippedx0)) +
        ptd->clippedy0;
    ptd->clippedx0 = ptd->clipleft;
    }
    if (ptd->clippedx1 <= ptd->clipleft && ptd->clippedx0 > ptd->clipleft) {
    ptd->clippedy1 = ((ptd->clippedy1-ptd->clippedy0) /
              (ptd->clippedx1-ptd->clippedx0) *
              (ptd->clipleft-ptd->clippedx0)) +
        ptd->clippedy0;
    ptd->clippedx1 = ptd->clipleft;
    }
    /* Clipping Right */
    if (ptd->clippedx1 >= ptd->clipright &&
    ptd->clippedx0 < ptd->clipright) {
    ptd->clippedy1 = ((ptd->clippedy1-ptd->clippedy0) /
              (ptd->clippedx1-ptd->clippedx0) *
              (ptd->clipright-ptd->clippedx0)) +
        ptd->clippedy0;
    ptd->clippedx1 = ptd->clipright;
    }
    if (ptd->clippedx1 <= ptd->clipright &&
    ptd->clippedx0 > ptd->clipright) {
    ptd->clippedy0 = ((ptd->clippedy1-ptd->clippedy0) /
              (ptd->clippedx1-ptd->clippedx0) *
              (ptd->clipright-ptd->clippedx0)) +
        ptd->clippedy0;
    ptd->clippedx0 = ptd->clipright;
    }
    /*Clipping Bottom */
    if (ptd->clippedy1 >= ptd->clipbottom  &&
    ptd->clippedy0 < ptd->clipbottom ) {
    ptd->clippedx0 = ((ptd->clippedx1-ptd->clippedx0) /
              (ptd->clippedy1-ptd->clippedy0) *
              (ptd->clipbottom -ptd->clippedy0)) +
        ptd->clippedx0;
    ptd->clippedy0 = ptd->clipbottom ;
    }
    if (ptd->clippedy1 <= ptd->clipbottom &&
    ptd->clippedy0 > ptd->clipbottom ) {
    ptd->clippedx1 = ((ptd->clippedx1-ptd->clippedx0) /
              (ptd->clippedy1-ptd->clippedy0) *
              (ptd->clipbottom -ptd->clippedy0)) +
        ptd->clippedx0;
    ptd->clippedy1 = ptd->clipbottom ;
    }
    /*Clipping Top */
    if (ptd->clippedy1 >= ptd->cliptop  && ptd->clippedy0 < ptd->cliptop ) {
    ptd->clippedx1 = ((ptd->clippedx1-ptd->clippedx0) /
              (ptd->clippedy1-ptd->clippedy0) *
              (ptd->cliptop -ptd->clippedy0)) +
        ptd->clippedx0;
    ptd->clippedy1 = ptd->cliptop ;
    }
    if (ptd->clippedy1 <= ptd->cliptop && ptd->clippedy0 > ptd->cliptop ) {
    ptd->clippedx0 = ((ptd->clippedx1-ptd->clippedx0) /
              (ptd->clippedy1-ptd->clippedy0) *
              (ptd->cliptop -ptd->clippedy0)) +
        ptd->clippedx0;
    ptd->clippedy0 = ptd->cliptop ;
    }
}

static void PicTeX_Line(double x1, double y1, double x2, double y2,
            int coords, DevDesc *dd)
{
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    if (x1 != x2 || y1 != y2) {
    SetLinetype(dd->gp.lty, dd->gp.lwd, dd);
    GConvert(&x1, &y1, coords, DEVICE, dd);
    GConvert(&x2, &y2, coords, DEVICE, dd);
    if(ptd->debug)
        fprintf(ptd->texfp,
            "%% Drawing line from %.2f, %.2f to %.2f, %.2f\n",
            x1, y1, x2, y2);
    PicTeX_ClipLine(x1, y1, x2, y2, ptd);
    if (ptd->debug)
        fprintf(ptd->texfp,
            "%% Drawing cliped ine from %.2f, %.2f to %.2f, %.2f\n",
            ptd->clippedx0, ptd->clippedy0,
            ptd->clippedx1, ptd->clippedy1);
    fprintf(ptd->texfp, "\\plot %.2f %.2f %.2f %.2f /\n",
        ptd->clippedx0, ptd->clippedy0,
        ptd->clippedx1, ptd->clippedy1);
    }
}

static void PicTeX_Polyline(int n, double *x, double *y, int coords,
                DevDesc* dd)
{
    double x1, y1, x2, y2;
    int i;
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    SetLinetype(dd->gp.lty, dd->gp.lwd, dd);
    x1 = x[0];
    y1 = y[0];
    GConvert(&x1, &y1, coords, DEVICE, dd);
    for (i=1; i<n; i++) {
    x2 = x[i];
    y2 = y[i];
    GConvert(&x2, &y2, coords, DEVICE, dd);
    PicTeX_ClipLine(x1, y1, x2, y2, ptd);
    fprintf(ptd->texfp, "\\plot %.2f %.2f %.2f %.2f /\n",
        ptd->clippedx0, ptd->clippedy0,
        ptd->clippedx1, ptd->clippedy1);
    }
}

    /* String Width in Rasters */
    /* For the current font in pointsize fontsize */

static double PicTeX_StrWidth(char *str, DevDesc *dd)
{
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    char *p;
    int size;
    double sum;
    size = dd->gp.cex * dd->gp.ps + 0.5;
    SetFont(dd->gp.font, size, ptd);
    sum = 0;
    for(p=str ; *p ; p++)
    sum += charwidth[ptd->fontface-1][(int)*p];
    return sum * ptd->fontsize;
}




    /* Start a Path */
/* NO LONGER USED
    static void PicTeX_StartPath()
    {
        SetLinetype(GP->lty, dd->gp.lwd, dd);
    }
*/

    /* End a Path */
/* NO LONGER USED
    static void PicTeX_EndPath()
    {
    }
*/

/* Possibly Filled Rectangle */
static void PicTeX_Rect(double x0, double y0, double x1, double y1,
            int coords, int bg, int fg, DevDesc *dd)
{
    double x[4], y[4];
    x[0] = x0; y[0] = y0;
    x[1] = x0; y[1] = y1;
    x[2] = x1; y[2] = y1;
    x[3] = x1; y[3] = y0;
    PicTeX_Polygon(4, x, y, coords, bg, fg, dd);
}

static void PicTeX_Circle(double x, double y, int coords, double r,
              int col, int border, DevDesc *dd)
{
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    GConvert(&x, &y, coords, DEVICE, dd);
    fprintf(ptd->texfp,
        "\\circulararc 360 degrees from %.2f %.2f center at %.2f %.2f\n",
        x, (y + r), x, y);

}

static void PicTeX_Polygon(int n, double *x, double *y, int coords,
               int bg, int fg, DevDesc* dd)
{
    double x1, y1, x2, y2;
    int i;
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    SetLinetype(dd->gp.lty, dd->gp.lwd, dd);
    x1 = x[0];
    y1 = y[0];
    GConvert(&x1, &y1, coords, DEVICE, dd);
    for (i=1; i<n; i++) {
    x2 = x[i];
    y2 = y[i];
    GConvert(&x2, &y2, coords, DEVICE, dd);
    PicTeX_ClipLine(x1, y1, x2, y2, ptd);
    fprintf(ptd->texfp, "\\plot %.2f %.2f %.2f %.2f /\n",
        ptd->clippedx0, ptd->clippedy0,
        ptd->clippedx1, ptd->clippedy1);
    x1 = x2;
    y1 = y2;
    }
    x2 = x[0];
    y2 = y[0];
    GConvert(&x2, &y2, coords, DEVICE, dd);
    PicTeX_ClipLine(x1, y1, x2, y2, ptd);
    fprintf(ptd->texfp, "\\plot %.2f %.2f %.2f %.2f /\n",
        ptd->clippedx0, ptd->clippedy0,
        ptd->clippedx1, ptd->clippedy1);
}

/* TeX Text Translations */
static void textext(char *str, picTeXDesc *ptd)
{
    fputc('{', ptd->texfp);
    for( ; *str ; str++)
    switch(*str) {
    case '$':
        fprintf(ptd->texfp, "\\$");
        break;

    case '%':
        fprintf(ptd->texfp, "\\%%");
        break;

    case '{':
        fprintf(ptd->texfp, "\\{");
        break;

    case '}':
        fprintf(ptd->texfp, "\\}");
        break;

    case '^':
        fprintf(ptd->texfp, "\\^{}");
        break;

    default:
        fputc(*str, ptd->texfp);
        break;
    }
    fprintf(ptd->texfp,"} ");
}

/* Rotated Text */

static void PicTeX_Text(double x, double y, int coords,
            char *str, double rot, double hadj,
            DevDesc *dd)
{
    int size;
    double xoff = 0.0, yoff = 0.0;
    picTeXDesc *ptd = (picTeXDesc *) dd->deviceSpecific;

    size = dd->gp.cex * dd->gp.ps + 0.5;
    SetFont(dd->gp.font, size, ptd);
    GConvert(&x, &y, coords, DEVICE, dd);
    if(ptd->debug) fprintf(ptd->texfp,
               "%% Writing string of length %.2f, at %.2f %.2f, xc = %.2f yc = %.2f\n",
               (double)PicTeX_StrWidth(str, dd), x, y, 0.0, 0.0);
    if (ptd->debug) fprintf(ptd->texfp,
                "%% Writing string of length %.2f, at %.2f %.2f, xc = %.2f yc = %.2f\n",
                (double)PicTeX_StrWidth(str, dd), x, y, 0.0, 0.0);

    fprintf(ptd->texfp,"\\put ");
    textext(str, ptd);
    if (rot == 90 )
    fprintf(ptd->texfp," [rB] <%.2fpt,%.2fpt>", xoff, yoff);
    else fprintf(ptd->texfp," [lB] <%.2fpt,%.2fpt>", xoff, yoff);
    fprintf(ptd->texfp," at %.2f %.2f\n", x, y);
}

/* Pick */
static int PicTeX_Locator(double *x, double *y, DevDesc *dd)
{
    return 0;
}


/* Set Graphics mode - not needed for PS */
static void PicTeX_Mode(int mode, DevDesc* dd)
{
}

/* GraphicsInteraction() for the Mac */
static void PicTeX_Hold(DevDesc *dd)
{
}

int PicTeXDeviceDriver(DevDesc *dd, char *filename, char *bg, char *fg,
               double width, double height, int debug)
{
    picTeXDesc *ptd;

    if (!(ptd = (picTeXDesc *) malloc(sizeof(picTeXDesc))))
    return 0;

    strcpy(ptd->filename, filename);

    dd->dp.bg = dd->gp.bg = str2col(bg);
    dd->dp.fg = dd->gp.fg = str2col(fg);

    dd->dp.activate = PicTeX_Activate;
    dd->dp.deactivate = PicTeX_Deactivate;
    dd->dp.open = PicTeX_Open;
    dd->dp.close = PicTeX_Close;
    dd->dp.clip = PicTeX_Clip;
    dd->dp.resize = PicTeX_Resize;
    dd->dp.newPage = PicTeX_NewPage;
    dd->dp.line = PicTeX_Line;
    dd->dp.text = PicTeX_Text;
    dd->dp.strWidth = PicTeX_StrWidth;
    dd->dp.rect = PicTeX_Rect;
    dd->dp.circle = PicTeX_Circle;
    dd->dp.polygon = PicTeX_Polygon;
    dd->dp.polyline = PicTeX_Polyline;
    dd->dp.locator = PicTeX_Locator;
    dd->dp.mode = PicTeX_Mode;
    dd->dp.hold = PicTeX_Hold;
    dd->dp.metricInfo = PicTeX_MetricInfo;

    /* Screen Dimensions in Pixels */

    dd->dp.left = 0;        /* left */
    dd->dp.right = 72.27 * width;   /* right */
    dd->dp.bottom = 0;      /* bottom */
    dd->dp.top = 72.27 * height;    /* top */
    ptd->width = width;
    ptd->height = height;

    if( ! PicTeX_Open(dd, ptd) ) return 0;

    /* Base Pointsize */
    /* Nominal Character Sizes in Pixels */

    dd->dp.ps = 10;
    dd->dp.cra[0] =  (6.0/12.0) * 10.0;
    dd->dp.cra[1] =  (10.0/12.0) * 10.0;

    /* Character Addressing Offsets */
    /* These offsets should center a single */
    /* plotting character over the plotting point. */
    /* Pure guesswork and eyeballing ... */

    dd->dp.xCharOffset =  0; /*0.4900;*/
    dd->dp.yCharOffset =  0; /*0.3333;*/
    dd->dp.yLineBias = 0; /*0.1;*/

    /* Inches per Raster Unit */
    /* We use printer points */
    /* I.e. 72.27 dots per inch */

    dd->dp.ipr[0] = 1.0/72.27;
    dd->dp.ipr[1] = 1.0/72.27;

    dd->dp.canResizePlot = 0;
    dd->dp.canChangeFont = 1;
    dd->dp.canRotateText = 0;
    dd->dp.canResizeText = 1;
    dd->dp.canClip = 1;
    dd->dp.canHAdj = 0;

    ptd->lty = 1;
    ptd->pageno = 0;
    ptd->debug = debug;

    dd->deviceSpecific = (void *) ptd;
    dd->displayListOn = 0;
    return 1;
}