File: latex.trm

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/*
 * $Id: latex.trm,v 1.9.2.1 1999/08/19 14:17:37 lhecking Exp $
 *
 */

/* GNUPLOT - latex.trm */

/*[
 * Copyright 1990 - 1993, 1998
 *
 * Permission to use, copy, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 *
 * Permission to modify the software is granted, but not the right to
 * distribute the complete modified source code.  Modifications are to
 * be distributed as patches to the released version.  Permission to
 * distribute binaries produced by compiling modified sources is granted,
 * provided you
 *   1. distribute the corresponding source modifications from the
 *    released version in the form of a patch file along with the binaries,
 *   2. add special version identification to distinguish your version
 *    in addition to the base release version number,
 *   3. provide your name and address as the primary contact for the
 *    support of your modified version, and
 *   4. retain our contact information in regard to use of the base
 *    software.
 * Permission to distribute the released version of the source code along
 * with corresponding source modifications in the form of a patch file is
 * granted with same provisions 2 through 4 for binary distributions.
 *
 * This software is provided "as is" without express or implied warranty
 * to the extent permitted by applicable law.
]*/

/*
 * This file is included by ../term.c.
 *
 * This terminal driver supports:
 *   LaTeX pictures (latex).
 *   LaTeX pictures with emTeX specials (emtex). 
 *
 * AUTHORS
 *   David Kotz, Russell Lang
 *
 * send your comments or suggestions to (info-gnuplot@dartmouth.edu).
 * 
 */

/* modified to optimize use of \rule for long lines */
/* TLDC: modified to have nice line types */

/* the following LATEX driver has been modified by 
   Russell Lang, eln272v@monu1.cc.monash.oz from the
   GnuTeX 1.3 driver by David Kotz, David.Kotz@Dartmouth.edu.
   Since then it has been further extended by David Kotz.
   EmTeX driver by Russell Lang. */

/*  9 Dec 1992  LATEX_put_text rewritten to handle \\ newlines
                Daniel S. Lewart (d-lewart@uiuc.edu) */

/* Since it took me a little while to figure out what is happening,
 * I may as well write it down.
 *  There are three length scales of interest: inches, points
 * and dots. inches are obvious. points are the usual typesetting
 * thing (ie approx 72 points per inch). This driver works in
 * units of dots, which corresponds to pixels on a 300 DPI printer.
 * We do a \setlength{unitlength}{...pt} to make teX work in
 * terms of dots.  The ... is called LATEX_UNIT in here.
 *   The reason I had to get involved in all of this is because
 * font size (in pts) was not being scaled up by DOTS_PER_POINT
 * - drd, Sept 1996
 */

#include "driver.h"

#ifdef TERM_REGISTER
register_term(latex)
#ifdef EMTEX
register_term(emtex)
#endif
#endif

#ifdef TERM_PROTO
TERM_PUBLIC void LATEX_options __PROTO((void));
TERM_PUBLIC void LATEX_init __PROTO((void));
TERM_PUBLIC void LATEX_graphics __PROTO((void));
TERM_PUBLIC void LATEX_text __PROTO((void));
TERM_PUBLIC void LATEX_put_text __PROTO((unsigned int x, unsigned int y, char str[]));
TERM_PUBLIC void LATEX_linetype __PROTO((int linetype));
TERM_PUBLIC void LATEX_move __PROTO((unsigned int x, unsigned int y));
TERM_PUBLIC void LATEX_point __PROTO((unsigned int x, unsigned int y, int number));
TERM_PUBLIC void LATEX_vector __PROTO((unsigned int ux, unsigned int uy));
TERM_PUBLIC void LATEX_arrow __PROTO((unsigned int sx, unsigned int sy, unsigned int ex, unsigned int ey, TBOOLEAN head));
TERM_PUBLIC int LATEX_justify_text __PROTO((enum JUSTIFY mode));
TERM_PUBLIC int LATEX_text_angle __PROTO((int ang));
TERM_PUBLIC void LATEX_reset __PROTO((void));

#ifdef EMTEX
TERM_PUBLIC void EMTEX_init __PROTO((void));
TERM_PUBLIC void EMTEX_reset __PROTO((void));
TERM_PUBLIC void EMTEX_text __PROTO((void));
#endif

#ifdef EEPIC
TERM_PUBLIC void EEPIC_move __PROTO((unsigned int x, unsigned int y));
TERM_PUBLIC void EEPIC_vector __PROTO((unsigned int ux, unsigned int uy));
#endif

#define TINY_STEP 0.5		/* tiny steps for high quality lines */

#define LATEX_PTS_PER_INCH (72.27)
#define DOTS_PER_INCH (300)	/* resolution of printer we expect to use */
#define LATEX_UNIT (LATEX_PTS_PER_INCH/DOTS_PER_INCH)	/* dot size in pt */

/* 5 inches wide by 3 inches high (default) */
#define LATEX_XMAX (5*DOTS_PER_INCH)	/* (LATEX_PTS_PER_INCH/LATEX_UNIT*5.0) */
#define LATEX_YMAX (3*DOTS_PER_INCH)	/* (LATEX_PTS_PER_INCH/LATEX_UNIT*3.0) */

#define LATEX_HTIC (5*DOTS_PER_INCH/72)		/* (5 pts) */
#define LATEX_VTIC (5*DOTS_PER_INCH/72)		/* (5 pts) */
#define LATEX_HCHAR (DOTS_PER_INCH*53/10/72)	/* (5.3 pts) */
#define LATEX_VCHAR (DOTS_PER_INCH*11/72)	/* (11 pts) */
#endif


#ifndef TERM_PROTO_ONLY
#ifdef TERM_BODY

static int LATEX_posx;
static int LATEX_posy;
static int LATEX_fontsize = 10;
static char LATEX_font[MAX_ID_LEN+1] = "cmr";
static enum JUSTIFY latex_justify = LEFT;
static int latex_angle = 0;

/* Default line-drawing character */
/* the definition of plotpoint varies with linetype */
#define LATEX_DOT "\\usebox{\\plotpoint}"
#define LATEX_TINY_DOT "\\rule{1pt}{1pt}"	/* for dots plot style */

/* POINTS */
#define LATEX_POINT_TYPES 12	/* we supply more point types */
static char GPFAR *GPFAR LATEX_points[] =
{
    "\\raisebox{-.8pt}{\\makebox(0,0){$\\Diamond$}}",
    "\\makebox(0,0){$+$}",
    "\\raisebox{-.8pt}{\\makebox(0,0){$\\Box$}}",
    "\\makebox(0,0){$\\times$}",
    "\\makebox(0,0){$\\triangle$}",
    "\\makebox(0,0){$\\star$}",
    "\\circle{12}", "\\circle{18}", "\\circle{24}",
    "\\circle*{12}", "\\circle*{18}", "\\circle*{24}"
};

/* LINES */
static float LATEX_size = 0;	/* current thick of line in points */
static float LATEX_dotspace = 0;	/* current dotspace of line in points */
#define LATEX_LINE_TYPES 6	/* number of line types below */
#define LATEX_THIN_LINE 0	/* the thinnest solid line type */
static struct {
    float size;			/* size of dot, or thick of line in points */
    float dotspace;		/* inter-dot space in points; 0 for lines */
} GPFAR LATEX_lines[] =

{
    {0.4, 0.0},			/* thin solid line */
    {0.4, 5.0},			/* thin dotted line */
    {0.8, 0.0},			/* thick solid line */
    {1.0, 5.0},			/* thick dotted line */
    {1.2, 0.0},			/* Thick solid line */
    {1.0, 10.0},		/* thick widely dotted line */
};

/* for drawing dotted and solid lines */
static void LATEX_dot_line __PROTO((int x1, int x2, int y1, int y2));
static void LATEX_solid_line __PROTO((int x1, int x2, int y1, int y2));
static void LATEX_rule __PROTO((int code, double x, double y, double width, double height));
static void LATEX_flushdot __PROTO((void));
#define LATEX_flushrule() LATEX_rule(2, 0.,0.,0.,0.)	/* flush old rule */
static TBOOLEAN LATEX_moved = TRUE;	/* pen is up after move */
static float LATEX_dotsize;	/* size of LATEX_DOT in units */
static TBOOLEAN LATEX_needsdot = FALSE;		/* does dotted line need termination? */

#ifdef EMTEX
TBOOLEAN emtex = FALSE;		/* not currently using emtex */
static void
EMTEX_solid_line __PROTO((int x1, int x2, int y1, int y2));
#endif

/* ARROWS */
/* the set of non-vertical/non-horizontal LaTeX vector slopes */
/* except negatives - they are handled specially */
static struct vslope {
    int dx, dy;
} GPFAR LATEX_slopes[] =

{
    {1, 1},
    {1, 2},
    {1, 3},
    {1, 4},
    {2, 1},
    {2, 3},
    {3, 1},
    {3, 2},
    {3, 4},
    {4, 1},
    {4, 3},
    {0, 0}			/* terminator */
};

/* figure out the best arrow */
void best_latex_arrow __PROTO((int, int, int, int, int, TBOOLEAN));

TERM_PUBLIC void LATEX_options()
{
    if (!END_OF_COMMAND) {
	if (almost_equals(c_token, "c$ourier")) {
	    strcpy(LATEX_font, "cmtt");
	    c_token++;
	} else if (almost_equals(c_token, "r$oman")) {
	    strcpy(LATEX_font, "cmr");
	    c_token++;
	} else if (almost_equals(c_token, "d$efault")) {
	    strcpy(LATEX_font, "doc");
	    c_token++;
	}
    }
    if (!END_OF_COMMAND) {
	struct value a;
	LATEX_fontsize = (int) real(const_express(&a));
    }
    /* tell gnuplot core about char. sizes. Horizontal spacing
     * is about half the text pointsize
     */
    term->v_char = (unsigned int) (LATEX_fontsize * DOTS_PER_INCH / 72);
    term->h_char = (unsigned int) (LATEX_fontsize * DOTS_PER_INCH / 144);

    if (strcmp(LATEX_font, "doc")==0)
	strncpy(term_options, "(document specific font)",MAX_LINE_LEN);
    else
	sprintf(term_options, "%s %d",
		LATEX_font[2] == 't' ? "courier" : "roman", LATEX_fontsize);
}


TERM_PUBLIC void LATEX_init()
{
#ifdef EMTEX
    emtex = FALSE;
#endif
    LATEX_posx = LATEX_posy = 0;

    fprintf(gpoutfile, "\
%% GNUPLOT: LaTeX picture\n\
\\setlength{\\unitlength}{%fpt}\n\
\\ifx\\plotpoint\\undefined\\newsavebox{\\plotpoint}\\fi\n",
	    LATEX_UNIT);

    LATEX_linetype(-1);
    LATEX_size = 0;
}

TERM_PUBLIC void LATEX_graphics()
{
    register struct termentry *t = term;

    /* bounding box */
    int xscale = xsize * t->xmax;
    int yscale = ysize * t->ymax;

    fprintf(gpoutfile, "\\begin{picture}(%d,%d)(0,0)\n", xscale, yscale);
    if (strcmp(LATEX_font, "doc") != 0) {
	fprintf(gpoutfile, "\
\\font\\gnuplot=%s10 at %dpt\n\
\\gnuplot\n",
		LATEX_font, LATEX_fontsize);
    }
}


TERM_PUBLIC void LATEX_text()
{
    LATEX_flushrule();
    LATEX_flushdot();
    fputs("\\end{picture}\n", gpoutfile);
    LATEX_posx = LATEX_posy = 0;	/* current position */
    LATEX_moved = TRUE;		/* pen is up after move */
}

TERM_PUBLIC void LATEX_linetype(linetype)
int linetype;
{
    float size;

    if (linetype >= LATEX_LINE_TYPES)
	linetype %= LATEX_LINE_TYPES;

#ifdef EMTEX
    if (!emtex)
#endif
	LATEX_flushrule();
    LATEX_flushdot();

    /* Find the new desired line thickness. */
    /* negative linetypes (for axes) use a thin line */
    /* only relevant for drawing axes/border in 3d */
    size = (linetype >= 0 ? LATEX_lines[linetype].size
	    : LATEX_lines[LATEX_THIN_LINE].size);

    /* If different from current size, redefine \plotpoint */
    if (size != LATEX_size) {
	fprintf(gpoutfile,
		"\\sbox{\\plotpoint}{\\rule[%.3fpt]{%.3fpt}{%.3fpt}}%%\n",
		-size / 2, size, size);
#ifdef EMTEX
	if (emtex)		/* change line width */
	    fprintf(gpoutfile, "\\special{em:linewidth %.1fpt}%%\n", size);
#endif
    }
    LATEX_size = size;
    LATEX_dotsize = size / LATEX_UNIT;
    LATEX_dotspace = (linetype >= 0) ? LATEX_lines[linetype].dotspace : 0;
    LATEX_moved = TRUE;		/* reset */
}

TERM_PUBLIC void LATEX_move(x, y)
unsigned int x, y;
{
    LATEX_flushdot();

    LATEX_posx = x;
    LATEX_posy = y;
    LATEX_moved = TRUE;		/* reset */
}


TERM_PUBLIC void LATEX_point(x, y, number) /* version of line_and_point */
unsigned int x, y;
int number;			/* type of point */
{
    LATEX_move(x, y);

    /* Print the character defined by 'number'; number < 0 means 
       to use a dot, otherwise one of the defined points. */
    fprintf(gpoutfile, "\\put(%d,%d){%s}\n", x, y,
	    (number < 0 ? LATEX_TINY_DOT
	     : LATEX_points[number % LATEX_POINT_TYPES]));
}


TERM_PUBLIC void LATEX_vector(ux, uy)
unsigned int ux, uy;
{
    if (LATEX_dotspace == 0.0) {
	/* solid line */
#ifdef EMTEX
	if (emtex)
	    EMTEX_solid_line(LATEX_posx, (int) ux, LATEX_posy, (int) uy);
	else
#endif
	    LATEX_solid_line(LATEX_posx, (int) ux, LATEX_posy, (int) uy);
    } else
	/* dotted line */
	LATEX_dot_line(LATEX_posx, (int) ux, LATEX_posy, (int) uy);

    LATEX_posx = ux;
    LATEX_posy = uy;
}

static void LATEX_solid_line(x1, x2, y1, y2)
int x1, x2, y1, y2;
{
    float slope;
    int inc;
    float dx, dy, x, y;
    float offset, length;
    int code;			/* possibly combine with previous rule */

    /* we draw a solid line using the current line thickness (size) */
    /* we do it with lots of \\rules */

    if (x1 == x2 && y1 == y2) {	/* zero-length line - just a dot */
	if (LATEX_moved) {
	    LATEX_flushrule();
	    /* plot a dot */
	    fprintf(gpoutfile, "\\put(%u,%u){%s}\n", x1, y1, LATEX_DOT);
	}
    } else {
	code = (LATEX_moved ? 0 : 1);	/* no combine after move */
	LATEX_moved = FALSE;
	if (x1 == x2)		/* vertical line - special case */
	    LATEX_rule(code, (double) x1, (double) y1,
		       LATEX_dotsize, (double) y2 - y1);
	else if (y1 == y2)	/* horizontal line - special case */
	    LATEX_rule(code, (double) x1, (double) y1, (double) x2 - x1,
		       LATEX_dotsize);
	else {
	    dx = (float) x2 - x1;
	    dy = (float) y2 - y1;
	    slope = dy / dx;
	    if (ABS(slope) <= 1.0) {
		/* longer than high */
		x = GPMIN(ABS(dx), (0.25 + 1.0 / ABS(slope)) * LATEX_dotsize);
		offset = sign(dy) * GPMIN(LATEX_dotsize, ABS(dy));
		dy = dy - offset;
		length = x * LATEX_UNIT;
		inc = (x == ABS(dx) ? 1 : GPMAX(1, ABS(dy) / TINY_STEP + 0.5));
		if (inc == 1) {
		    fprintf(gpoutfile, "\\put(%u,%.2f){\\rule{%.3fpt}{%.3fpt}}\n",
			    (x2 >= x1 ? x1 : x2), ((float) y1 + y2 - LATEX_dotsize) / 2,
			    length, LATEX_dotsize * LATEX_UNIT);
		} else {
		    dy = dy / inc;
		    dx = (dx - sign(dx) * x) / (inc - 1);
		    fprintf(gpoutfile,
			    "\\multiput(%.2f,%.2f)(%.3f,%.3f){%u}{\\rule{%.3fpt}{%.3fpt}}\n",
			    (dx >= 0.0 ? (float) x1 : x1 - x),
			    (float) y1 - (ABS(dy) - offset) / 2,
			    dx, dy, inc, length, ABS(dy) * LATEX_UNIT);
		}
/* done with one section, now smooth it */
		x = x / 2;
		dx = sign(dx) * x;
		dx = (float) x2 - x1 - dx;
		dy = (float) y2 - y1;
		fprintf(gpoutfile, "\\multiput(%.2f,%.2f)(%.3f,%.3f){2}{\\rule{%.3fpt}{%.3fpt}}\n",
			(dx >= 0.0 ? (float) x1 : x1 - x), (float) y1 - LATEX_dotsize / 2,
			dx, dy, x * LATEX_UNIT, LATEX_dotsize * LATEX_UNIT);
		LATEX_moved = TRUE;
	    } else {
		/* higher than long */
		y = GPMIN(ABS(dy), (0.25 + ABS(slope)) * LATEX_dotsize);
		offset = sign(dx) * GPMIN(LATEX_dotsize, ABS(dx));
		dx = dx - offset;
		length = y * LATEX_UNIT;
		inc = (y == ABS(dy) ? 1 : GPMAX(1, ABS(dx) / TINY_STEP + 0.5));
		if (inc == 1) {
		    fprintf(gpoutfile, "\\put(%.2f,%u){\\rule{%.3fpt}{%.3fpt}}\n",
			    ((float) x1 + x2 - LATEX_dotsize) / 2, (y2 >= y1 ? y1 : y2),
			    LATEX_dotsize * LATEX_UNIT, length);
		} else {
		    dx = dx / inc;
		    dy = (dy - sign(dy) * y) / (inc - 1);
		    fprintf(gpoutfile,
			    "\\multiput(%.2f,%.2f)(%.3f,%.3f){%u}{\\rule{%.3fpt}{%.3fpt}}\n",
			    (float) x1 - (ABS(dx) - offset) / 2,
			    (dy >= 0 ? (float) y1 : y1 - y),
			    dx, dy, inc, ABS(dx) * LATEX_UNIT, length);
		}
/* done with one section, now smooth it */
		y = y / 2;
		dx = (float) x2 - x1;
		dy = sign(dy) * y;
		dy = (float) y2 - y1 - dy;
		fprintf(gpoutfile, "\\multiput(%.2f,%.2f)(%.3f,%.3f){2}{\\rule{%.3fpt}{%.3fpt}}\n",
			(float) x1 - LATEX_dotsize / 2, (dy >= 0.0 ? (float) y1 : y1 - y),
			dx, dy, LATEX_dotsize * LATEX_UNIT, y * LATEX_UNIT);
		LATEX_moved = TRUE;
	    }
	}
    }
}

/* Draw a \rule. Width or height may be negative; we can correct.
 * The rule is never output immediately. The previous rule is output
 * as-is if code is 0, and the previous rule is
 * combined with the current rule (if possible) if code is 1.
 * The previous rule is output, and the new one ignored, if code is 2.
 */
static void LATEX_rule(code, x, y, width, height)
int code;			/* how do we treat this rule? */
double x, y;
double width;
double height;
{
    static float lastx, lasty;
    static float lastw, lasth;
    static TBOOLEAN isvalid = FALSE;	/* is 'last' data valid? */
    TBOOLEAN combine = (code == 1);
    TBOOLEAN flush = (code == 2);

    if (!flush)
	if (width == 0 || height == 0)
	    return;		/* ignore this rule */

    if (isvalid && combine) {
	/* try to combine new rule with old rule */
	if ((int) lastx == (int) x && lastw == width) {		/* vertical rule */
	    if (lasth * height >= 0) {	/* same sign */
		lasth += height;
		return;
	    }
	} else if ((int) lasty == (int) y && lasth == height) {		/* horiz rule */
	    if (lastw * width >= 0) {	/* same sign */
		lastw += width;
		return;
	    }
	}
	/* oh well, output last and remember the new one */
    }
    if (isvalid) {
	/* output the rule */
	if (lastw < 0) {
	    lastx += lastw;
	    lastw = -lastw;
	}
	if (lasth < 0) {
	    lasty += lasth;
	    lasth = -lasth;
	}
	/* if very small use canned dot */
	if (lastw < LATEX_dotsize || lasth < LATEX_dotsize)
	    fprintf(gpoutfile, "\\put(%.1f,%.1f){%s}\n",
		    lastx, lasty, LATEX_DOT);
	else
	    fprintf(gpoutfile, "\\put(%.1f,%.1f){\\rule[%.3fpt]{%.3fpt}{%.3fpt}}\n",
		    lastx, lasty, -LATEX_dotsize * LATEX_UNIT / 2,
		    lastw * LATEX_UNIT, lasth * LATEX_UNIT);
    }
    if (flush) {
	isvalid = FALSE;
    } else {
	lastx = x;
	lasty = y;
	lastw = width;
	lasth = height;
	isvalid = TRUE;
    }
}

static void LATEX_dot_line(x1, x2, y1, y2)
int x1, x2, y1, y2;
{
    static float LATEX_left;	/* fraction of space left after last dot */

    /* we draw a dotted line using the current dot spacing */

    if (LATEX_moved)
	LATEX_left = 1.0;	/* reset after a move */

    /* zero-length line? */
    if (x1 == x2 && y1 == y2) {
	if (LATEX_moved)
	    /* plot a dot */
	    fprintf(gpoutfile, "\\put(%u,%u){%s}\n", x1, y1, LATEX_DOT);
    } else {
	float dotspace = LATEX_dotspace / LATEX_UNIT;
	float x, y;		/* current position */
	float xinc, yinc;	/* increments */
	float slope;		/* slope of line */
	float lastx = -1;	/* last x point plotted */
	float lasty = -1;	/* last y point plotted */
	int numdots = 0;	/* number of dots in this section */

	/* first, figure out increments for x and y */
	if (x2 == x1) {
	    xinc = 0.0;
	    yinc = (y2 - y1 > 0) ? dotspace : -dotspace;
	} else {
	    slope = ((float) y2 - y1) / ((float) x2 - x1);
	    xinc = dotspace / sqrt(1 + slope * slope) * sign(x2 - x1);
	    yinc = slope * xinc;
	}

	/* now draw the dotted line */
	/* we take into account where we last placed a dot */
	for (x = x1 + xinc * (1 - LATEX_left), y = y1 + yinc * (1 - LATEX_left);
	     (x2 - x) * xinc >= 0 && (y2 - y) * yinc >= 0;	/* same sign or zero */
	     lastx = x, x += xinc,
	     lasty = y, y += yinc)
	    numdots++;
	if (numdots == 1)
	    fprintf(gpoutfile, "\\put(%.2f,%.2f){%s}\n",
		    lastx, lasty, LATEX_DOT);
	else if (numdots > 0)
	    fprintf(gpoutfile, "\\multiput(%u,%u)(%.3f,%.3f){%u}{%s}\n",
		    x1, y1, xinc, yinc, numdots, LATEX_DOT);

	/* how much is left over, as a fraction of dotspace? */
	if (xinc != 0.0)	/* xinc must be nonzero */
	    if (lastx >= 0)
		LATEX_left = ABS(x2 - lastx) / ABS(xinc);
	    else
		LATEX_left += ABS(x2 - x1) / ABS(xinc);
	else if (lasty >= 0)
	    LATEX_left = ABS(y2 - lasty) / ABS(yinc);
	else
	    LATEX_left += ABS(y2 - y1) / ABS(yinc);
    }

    LATEX_needsdot = (LATEX_left > 0);

    LATEX_moved = FALSE;
}

static void LATEX_flushdot()
{
    if (LATEX_needsdot)
	fprintf(gpoutfile, "\\put(%d,%d){%s}\n",
		LATEX_posx, LATEX_posy, LATEX_DOT);
    LATEX_needsdot = FALSE;
}

TERM_PUBLIC void LATEX_arrow(sx, sy, ex, ey, head)
unsigned int sx, sy, ex, ey;
TBOOLEAN head;
{
    best_latex_arrow(sx, sy, ex, ey, 1, head);

    LATEX_posx = ex;
    LATEX_posy = ey;
}

void best_latex_arrow(sx, sy, ex, ey, who, head)
int sx, sy, ex, ey;		/* start and end points */
int who;			/* 1=LATEX, 2=EEPIC */
TBOOLEAN head;
{
    int dx = ex - sx;
    int dy = ey - sy;
    float m;			/* slope of line */
    float arrowslope;		/* slope of arrow */
    float minerror = 0;		/* best-case error */
    struct vslope *slope;	/* one of the slopes */
    struct vslope *bestslope;	/* the slope with min error */

    /* We try to draw a real arrow (ie, \vector). If we can't get
       * a slope that is close, we draw a bent arrow.
     */

    if (dx == 0) {
	/* vertical arrow */
	fprintf(gpoutfile, "\\put(%d,%d){\\%s(0,%d){%d}}\n",
		sx, sy, head ? "vector" : "line",
		sign(ey - sy), ABS(ey - sy));
    } else if (dy == 0) {
	/* horizontal arrow */
	fprintf(gpoutfile, "\\put(%d,%d){\\%s(%d,0){%d}}\n",
		sx, sy, head ? "vector" : "line",
		sign(ex - sx), ABS(ex - sx));
    } else {
	/* Slanted arrow. We'll give it a try.
	 * we try to find the closest-slope arrowhead.
	 */
	bestslope = NULL;
	minerror = 0;		/* to shut up turbo C */
	m = ABS((float) dy / dx);	/* the slope we want */
	for (slope = LATEX_slopes; slope->dx != 0.0; slope++) {
	    /* find the slope of the arrow */
	    arrowslope = (float) slope->dy / slope->dx;
	    if (bestslope == NULL || ABS(m - arrowslope) < minerror) {
		minerror = ABS(m - arrowslope);
		bestslope = slope;
	    }
	}

	/* now we have the best slope arrow */
	/* maybe it's exactly the right slope! */
	if (minerror == 0.0)	/* unlikely but possible */
	    fprintf(gpoutfile, "\\put(%d,%d){\\%s(%d,%d){%d}}\n",
		    sx, sy, head ? "vector" : "line",
		    bestslope->dx * sign(ex - sx), bestslope->dy * sign(ey - sy),
		    ABS(ex - sx));
	else {
	    /* we draw the line the usual way, with thin lines */
#ifdef EMTEX
	    if (emtex) {
		LATEX_linetype(LATEX_THIN_LINE);
		EMTEX_solid_line(sx, ex, sy, ey);
	    } else
#endif
	    if (who == 1) {
		LATEX_linetype(LATEX_THIN_LINE);
		LATEX_solid_line(sx, ex, sy, ey);
	    }
#ifdef EEPIC
	    else {
		EEPIC_move(sx, sy);
		EEPIC_vector(ex, ey);
	    }
#endif /* EEPIC */
	    /* and then draw an arrowhead (a short vector) there */
	    if (head)
		fprintf(gpoutfile, "\\put(%d,%d){\\vector(%d,%d){0}}\n",
			ex, ey,
			bestslope->dx * sign(ex - sx), bestslope->dy * sign(ey - sy));
	}
    }
}

TERM_PUBLIC void LATEX_put_text(x, y, str)
unsigned int x, y;		/* reference point of string */
char str[];			/* the text */
{
    static char *justify[] =
    {"[l]", "", "[r]"};
    int flag, i;

    /* ignore empty strings */
    if (str[0] == NUL)
	return;

    for (flag = FALSE, i = 0; str[i] && !flag;)
	flag = (str[i++] == '\\') && (str[i++] == '\\');

    fprintf(gpoutfile, "\\put(%d,%d)", x, y);
    if ((str[0] == '{') || (str[0] == '[')) {
	fprintf(gpoutfile, "{\\makebox(0,0)%s}\n", str);
    } else if (flag)
	fprintf(gpoutfile, "{\\makebox(0,0)%s{\\shortstack{%s}}}\n",
		justify[latex_justify], str);
    else
	fprintf(gpoutfile, "{\\makebox(0,0)%s{%s}}\n",
		justify[latex_justify], str);
}

TERM_PUBLIC int LATEX_justify_text(mode)
enum JUSTIFY mode;
{
    latex_justify = mode;
    return (TRUE);
}

TERM_PUBLIC int LATEX_text_angle(ang)
int ang;
{
    /* we can't really write text vertically, but this will 
       put the ylabel centred at the left of the plot, and
       then we'll make a \shortstack */
    latex_angle = ang;
    return (TRUE);
}

TERM_PUBLIC void LATEX_reset()
{
    LATEX_posx = LATEX_posy = 0;	/* current position */
    LATEX_moved = TRUE;		/* pen is up after move */
}


#ifdef EMTEX

TERM_PUBLIC void EMTEX_init()
{
    emtex = TRUE;
    LATEX_posx = LATEX_posy = 0;
    fprintf(gpoutfile, "\
%% GNUPLOT: LaTeX picture with emtex specials\n\
\\setlength{\\unitlength}{%fpt}\n\
\\ifx\\plotpoint\\undefined\\newsavebox{\\plotpoint}\\fi\n",
	    LATEX_UNIT);
    LATEX_linetype(-1);
}


TERM_PUBLIC void EMTEX_reset()
{
    emtex = FALSE;
    LATEX_posx = LATEX_posy = 0;
}


TERM_PUBLIC void EMTEX_text()
{
    fputs("\\end{picture}\n", gpoutfile);
}


static void EMTEX_solid_line(x1, x2, y1, y2)
int x1, x2, y1, y2;
{
    /* emtex special solid line */
    if (LATEX_moved)
	fprintf(gpoutfile, "\\put(%d,%d){\\special{em:moveto}}\n", x1, y1);
    if ((x1 != x2) || (y1 != y2))
	fprintf(gpoutfile, "\\put(%d,%d){\\special{em:lineto}}\n", x2, y2);
    LATEX_posx = x2;
    LATEX_posy = y2;
    LATEX_moved = FALSE;
}


#endif /* EMTEX */

#endif /* TERM_BODY */
#endif /* TERM_PROTO_ONLY */

#ifdef TERM_TABLE

TERM_TABLE_START(latex_driver)
    "latex", "LaTeX picture environment",
    LATEX_XMAX, LATEX_YMAX, LATEX_VCHAR, LATEX_HCHAR,
    LATEX_VTIC, LATEX_HTIC, LATEX_options, LATEX_init, LATEX_reset,
    LATEX_text, null_scale, LATEX_graphics, LATEX_move, LATEX_vector,
    LATEX_linetype, LATEX_put_text, LATEX_text_angle,
    LATEX_justify_text, LATEX_point, LATEX_arrow, set_font_null
TERM_TABLE_END(latex_driver)

#undef LAST_TERM
#define LAST_TERM latex_driver


#ifdef EMTEX
TERM_TABLE_START(emtex_driver)
    "emtex", "LaTeX picture environment with emTeX specials",
    LATEX_XMAX, LATEX_YMAX, LATEX_VCHAR, LATEX_HCHAR,
    LATEX_VTIC, LATEX_HTIC, LATEX_options, EMTEX_init, EMTEX_reset,
    EMTEX_text, null_scale, LATEX_graphics, LATEX_move, LATEX_vector,
    LATEX_linetype, LATEX_put_text, LATEX_text_angle,
    LATEX_justify_text, LATEX_point, LATEX_arrow, set_font_null
TERM_TABLE_END(emtex_driver)

#undef LAST_TERM
#define LAST_TERM emtex_driver

#endif /* EMTEX */
#endif /* TERM_TABLE */


#ifdef TERM_HELP
START_HELP(latex)
"1 latex",
"?commands set terminal emtex",
"?set terminal emtex",
"?set term emtex",
"?terminal emtex",
"?term emtex",
"?latex",
"?commands set terminal latex",
"?set terminal latex",
"?set term latex",
"?terminal latex",
"?term latex",
"?emtex",
" The `latex` and `emtex` drivers allow two options.",
"",
" Syntax:",
"       set terminal latex | emtex {courier | roman | default} {<fontsize>}",
"",
" `fontsize` may be any size you specify.  The default is for the plot to",
" inherit its font setting from the embedding document.",
"",
" Unless your driver is capable of building fonts at any size (e.g. dvips),",
" stick to the standard 10, 11 and 12 point sizes.",
"",
" METAFONT users beware: METAFONT does not like odd sizes.",
"",
" All drivers for LaTeX offer a special way of controlling text positioning:",
" If any text string begins with '{', you also need to include a '}' at the",
" end of the text, and the whole text will be centered both horizontally and",
" vertically.  If the text string begins with '[', you need to follow this with",
" a position specification (up to two out of t,b,l,r), ']{', the text itself,",
" and finally '}'.  The text itself may be anything LaTeX can typeset as an",
" LR-box.  '\\rule{}{}'s may help for best positioning.",
"",
" Points, among other things, are drawn using the LaTeX commands \"\\Diamond\" and",
" \"\\Box\".  These commands no longer belong to the LaTeX2e core; they are included",
" in the latexsym package, which is part of the base distribution and thus part",
" of any LaTeX implementation.  Please do not forget to use this package.",
"",
" Points are drawn with the LaTex commands \\Diamond and \\Box.  These",
" commands do no longer belong to the LaTeX2e core, but are included in the",
" latexsym-package in the base distribution, and are hence part of all LaTeX",
" implementations. Please do not forget to use this package.",
"",
" Examples:",
" About label positioning:",
" Use gnuplot defaults (mostly sensible, but sometimes not really best):",
"        set title '\\LaTeX\\ -- $ \\gamma $'",
" Force centering both horizontally and vertically:",
"        set label '{\\LaTeX\\ -- $ \\gamma $}' at 0,0",
" Specify own positioning (top here):",
"        set xlabel '[t]{\\LaTeX\\ -- $ \\gamma $}'",
" The other label -- account for long ticlabels:",
"        set ylabel '[r]{\\LaTeX\\ -- $ \\gamma $\\rule{7mm}{0pt}'"
END_HELP(latex)
#endif /* TERM_TABLE */