/*
 * TransFig: Facility for Translating Fig code
 * Copyright (c) 1985 Supoj Sutantavibul
 * Copyright (c) 1991 Micah Beck
 *
 * THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 *
 * The X Consortium, and any party obtaining a copy of these files from
 * the X Consortium, directly or indirectly, is granted, free of charge, a
 * full and unrestricted irrevocable, world-wide, paid up, royalty-free,
 * nonexclusive right and license to deal in this software and
 * documentation files (the "Software"), including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons who receive
 * copies from any such party to do so, with the only requirement being
 * that this copyright notice remain intact.  This license includes without
 * limitation a license to do the foregoing actions under any patents of
 * the party supplying this software to the X Consortium.
 */

/* 
 *	genibmgl.c :	IBMGL driver for fig2dev
 *			IBM 6180 Color Plotter with
 *			IBM Graphics Enhancement Cartridge
 * 	Author E. Robert Tisdale, University of California, 1/92
 *	(edwin@cs.ucla.edu)
 *
 *		adapted from:
 *
 *	genpictex.c :	PiCTeX driver for fig2dev
 *
 * 	Author Micah Beck, Cornell University, 4/88
 *	Color, rotated text and ISO-chars added by Herbert Bauer 11/91
*/

static set_style();

#if defined(hpux) || defined(SYSV) || defined(SVR4)
#include <sys/types.h>
#endif
#include <sys/file.h>
#if defined(SYSV) || defined(SVR4)
#include <string.h>
#else
#include <strings.h>
#endif
#include <stdio.h>
#include <math.h>
#include "fig2dev.h"
#include "object.h"
#include "pi.h"

#define		FONTS 			35
#define		COLORS 			8
#define		PATTERNS 		21
#define		DPR	 	180.0/M_PI	/* degrees/radian	*/
#define		DELTA	 	M_PI/36.0	/* radians		*/
#define		POINT_PER_INCH		72.27	/* points/inch		*/
#define		CMPP		254.0/7227.0	/* centimeters/point	*/
#define		UNITS_PER_INCH		 1016.0	/* plotter units/inch	*/
#define		HEIGHT			 7650.0	/* plotter units	*/
#define		ISO_A4			10900.0	/* plotter units	*/
#define		ANSI_A			10300.0	/* plotter units	*/
#define		SPEED_LIMIT		128.0	/* centimeters/second	*/

#ifdef IBMGEC
static	int	ibmgec		 = TRUE;
#else
static	int	ibmgec		 = FALSE;
#endif
static	int	reflected	 = FALSE;
static	int	fonts		 = FONTS;
static	int	colors		 = COLORS;
static	int	patterns	 = PATTERNS;
static	int	line_color	 = DEFAULT;
static	int	line_style	 = SOLID_LINE;
static	int	fill_pattern	 = DEFAULT;
static	double	dash_length	 = DEFAULT;	/* in pixels		*/
#ifdef A4
static	double	pagelength	 = ISO_A4/UNITS_PER_INCH;
#else
static	double	pagelength	 = ANSI_A/UNITS_PER_INCH;
#endif
static	double	pageheight	 = HEIGHT/UNITS_PER_INCH;
static	double	pen_speed	 = SPEED_LIMIT;
static	double	xz		 =  0.0;	/* inches		*/
static	double	yz		 =  0.0;	/* inches		*/
static	double	xl		 =  0.0;	/* inches		*/
static	double	yl		 =  0.0;	/* inches		*/
static	double	xu		 = 32.25;	/* inches		*/
static	double	yu		 = 32.25;	/* inches		*/

static	int	pen_number[]	 = { 1, 2, 3, 4, 5, 6, 7, 8, 1};
static	double	pen_thickness[]	 = {.3,.3,.3,.3,.3,.3,.3,.3,.3};

static	int	line_type[]	 =
	   {1, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6,-1,-1,-1,-1,-1,-1,-1,-1};
static	double	line_space[]	 =
	   {.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.5,.3,.3};
static	int	fill_type[]	 =
	   {3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 1, 2};
static	double	fill_space[]	 =
	   {.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1,.1};
static	double	fill_angle[]	 =
	   {0,-45,0,45,90,-45,0,45,90,-45,0,45,90,-45,0,45,90, 0, 0, 0, 0};

static	int	standard[]	 = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
static	int	alternate[]	 = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
static	double	slant[]		 = { 0,10, 0,10, 0,10, 0,10, 0,10, 0,10, 0,10,
	     0,10, 0,10, 0,10, 0,10, 0,10, 0,10, 0,10, 0,10, 0,10, 0,10, 0, 0};
static	double	wide[]		 = {.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,
	    .6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6,.6};
static	double	high[]		 = {.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,
	    .8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8,.8};

static void genibmgl_option(opt, optarg)
char opt, *optarg;
{
	switch (opt) {

	    case 'a':				/* paper size		*/
#ifdef A4
		pagelength	 = ANSI_A/UNITS_PER_INCH;
#else
		pagelength	 = ISO_A4/UNITS_PER_INCH;
#endif
		break;

	    case 'c':				/* Graphics Enhancement	*/
		ibmgec		 = !ibmgec;	/* Cartridge emulation	*/
		break;

	    case 'd':				/* position and window	*/
		sscanf(optarg, "%lf,%lf,%lf,%lf", &xl,&yl,&xu,&yu);
						/* inches		*/
		break;

	    case 'f':				/* user's characters	*/
		{
		    FILE	*ffp;
		    int		font;
		    if ((ffp = fopen(optarg, "r")) == NULL)
			fprintf(stderr, "Couldn't open %s\n", optarg);
		    else
			for (font = 0; font <= fonts; font++)
			    fscanf(ffp, "%d%d%lf%lf%lf",
				&standard[font],	/* 0-4 6-9 30-39*/
				&alternate[font],	/* 0-4 6-9 30-39*/
				&slant[font],		/*   degrees	*/
				&wide[font],		/*	~1.0	*/
				&high[font]);		/*	~1.0	*/
		    fclose(ffp);
		}
		break;

	    case 'l':				/* user's fill patterns	*/
		{
		    FILE	*ffp;
		    int		pattern;
		    if ((ffp = fopen(optarg, "r")) == NULL)
			fprintf(stderr, "Couldn't open %s\n", optarg);
		    else
			for (pattern = 0; pattern < patterns; pattern++)
			    fscanf(ffp, "%d%lf%d%lf%lf",
				&line_type[pattern],	/*    -1-6	*/
				&line_space[pattern],	/*   inches	*/
				&fill_type[pattern],	/*     1-5	*/
				&fill_space[pattern],	/*   inches	*/
				&fill_angle[pattern]);	/*   degrees	*/
		    fclose(ffp);
		}
		break;

	    case 's':
	    case 'L':				/* language		*/
		break;

	    case 'm':				/* magnify and offset	*/
		sscanf(optarg, "%lf,%lf,%lf", &mag,&xz,&yz);
						/* inches		*/
		break;

	    case 'p':				/* user's colors	*/
		{
		    FILE	*ffp;
		    int		color;
		    if ((ffp = fopen(optarg, "r")) == NULL)
			fprintf(stderr, "Couldn't open %s\n", optarg);
		    else
			for (color = 0; color <= colors; color++)
			    fscanf(ffp, "%d%lf",
				&pen_number[color],	/*     1-8	*/
				&pen_thickness[color]);	/* millimeters	*/
		    fclose(ffp);
		}
		break;

	    case 'P':				/* portrait mode	*/
		landscape	 = FALSE;
		orientspec	 = TRUE;	/* user-specified	*/
		break;

	    case 'S':				/* select pen velocity	*/
		pen_speed	 = atof(optarg);
		break;

	    case 'v':
		reflected	 = TRUE;	/* mirror image		*/
		break;

	    default:
		put_msg(Err_badarg, opt, "ibmgl");
		exit(1);
		break;
	}
}

static double		ppi;			/*     pixels/inch	*/
static double		cpi;			/*       cent/inch	*/
static double		cpp;			/*       cent/pixel	*/
static double		wcmpp	 = CMPP;	/* centimeter/point	*/
static double		hcmpp	 = CMPP;	/* centimeter/point	*/
static int		flipped	 = FALSE;	/* flip Y coordinate	*/

void genibmgl_start(objects)
F_compound	*objects;
{
	int	 P1x, P1y, P2x, P2y;
	int	 Xll, Yll, Xur, Yur;
	double	Xmin,Xmax,Ymin,Ymax;
	double	height, length;

	if (fabs(mag) < 1.0/2048.0){
	    fprintf(stderr, "|mag| < 1/2048\n");
	    exit(1);
	    }

	if (xl < xu)
	    if (0.0 < xu)
		if (xl < pagelength) {
		    xl	 = (0.0 < xl) ? xl: 0.0;
		    xu	 = (xu < pagelength) ? xu: pagelength;
		    }
		else {
		    fprintf(stderr, "xll >= %.2f\n", pagelength);
		    exit(1);
		    }
	    else {
		fprintf(stderr, "xur <= 0.0\n");
		exit(1);
		}
	else {
	    fprintf(stderr, "xur <= xll\n");
	    exit(1);
	    }

	if (yl < yu)
	    if (0.0 < yu)
		if (yl < pageheight) {
		    yl	 = (0.0 < yl) ? yl: 0.0;
		    yu	 = (yu < pageheight) ? yu: pageheight;
		    }
		else {
		    fprintf(stderr, "yll >= %.2f\n", pageheight);
		    exit(1);
		    }
	    else {
		fprintf(stderr, "yur <= 0.0\n");
		exit(1);
		}
	else {
	    fprintf(stderr, "yur <= yll\n");
	    exit(1);
	    }

	ppi	 = objects->nwcorner.x;
	cpi	 = mag*100.0/sqrt((xu-xl)*(xu-xl) + (yu-yl)*(yu-yl));
	cpp	 = cpi/ppi;
	if (objects->nwcorner.y == 2)
	    flipped	 = TRUE;

	/* IBMGL start */
	fprintf(tfp, "IN;\n");			/* initialize plotter	*/

	if (!landscape) {			/* portrait mode	*/
	    fprintf(tfp, "RO90;\n");		/* rotate 90 degrees	*/
	    Xll	 = yl*UNITS_PER_INCH;
	    Xur	 = yu*UNITS_PER_INCH;
	    Yll	 = (pagelength - xu)*UNITS_PER_INCH;
	    Yur	 = (pagelength - xl)*UNITS_PER_INCH;
	    length	 = yu - yl;
	    height	 = xu - xl;
	    P1x	 	 = Xll;
	    P2x		 = Xur;
	    if (reflected)			/* upside-down text	*/
		hcmpp	 = -hcmpp;
	    if (reflected^flipped) {		/* reflected or flipped */
		P1y	 = Yur;			/* but not both		*/
		P2y	 = Yll;
		}
	    else {				/* normal		*/
		P1y	 = Yll;
		P2y	 = Yur;
		}
	    }
	else {					/* landscape mode	*/
	    Xll	 = xl*UNITS_PER_INCH;
	    Yll	 = yl*UNITS_PER_INCH;
	    Yur	 = yu*UNITS_PER_INCH;
	    Xur	 = xu*UNITS_PER_INCH;
	    length	 = xu - xl;
	    height	 = yu - yl;
	    if (reflected) {			/* flipped   or not	*/
		wcmpp	 = -wcmpp;		/* backward text	*/
		P1x	 = Xur;
		P2x	 = Xll;
		}
	    else {				/* normal		*/
		P1x	 = Xll;
		P2x	 = Xur;
		}
	    if (flipped) {			/* reflected or not	*/
		P1y	 = Yur;
		P2y	 = Yll;
		}
	    else {
		P1y 	 = Yll;
		P2y 	 = Yur;
		}
	    }

	Xmin	 = xz;
	Ymin	 = yz;
	Xmax	 = xz + length/mag;
	Ymax	 = yz + height/mag;

	fprintf(tfp, "IP%d,%d,%d,%d;\n",
		P1x, P1y, P2x, P2y);
	fprintf(tfp, "IW%d,%d,%d,%d;\n",
		Xll, Yll, Xur, Yur);
	fprintf(tfp, "SC%.4f,%.4f,%.4f,%.4f;\n",
		Xmin,Xmax,Ymin,Ymax);
	if (0.0 < pen_speed && pen_speed < SPEED_LIMIT)
	    fprintf(tfp, "VS%.2f;\n", pen_speed);
}

static arc_tangent(x1, y1, x2, y2, direction, x, y)
double	x1, y1, x2, y2, *x, *y;
int	direction;
{
	if (direction) { /* counter clockwise  */
	    *x = x2 - (y2 - y1);
	    *y = y2 + (x2 - x1);
	    }
	else {
	    *x = x2 + (y2 - y1);
	    *y = y2 - (x2 - x1);
	    }
	}

/*	draw arrow heading from (x1, y1) to (x2, y2)	*/

static draw_arrow_head(x1, y1, x2, y2, arrowht, arrowwid)
double	x1, y1, x2, y2, arrowht, arrowwid;
{
	double	x, y, xb, yb, dx, dy, l, sina, cosa;
	double	xc, yc, xd, yd;
	int style;
	double length;

	dx	 = x2 - x1;
	dy	 = y1 - y2;
	l	 = sqrt(dx*dx+dy*dy);
	sina	 = dy/l;
	cosa	 = dx/l;
	xb	 = x2*cosa - y2*sina;
	yb	 = x2*sina + y2*cosa;
	x	 = xb - arrowht;
	y	 = yb - arrowwid/2.0;
	xc	 =  x*cosa + y*sina;
	yc	 = -x*sina + y*cosa;
	y	 = yb + arrowwid/2.0;
	xd	 =  x*cosa + y*sina;
	yd	 = -x*sina + y*cosa;

	/* save line style and set to solid */
	style	 = line_style;
	length	 = dash_length;
	set_style(SOLID_LINE, 0.0);

	fprintf(tfp, "PA%.4f,%.4f;PD%.4f,%.4f,%.4f,%.4f;PU\n",
		xc, yc, x2, y2, xd, yd);

	/* restore line style */
	set_style(style, length);
	}

/* 
 * set_style - issue line style commands as appropriate
 */
static set_style(style, length)
int	style;
double	length;
{
	if (style == line_style)
	    switch (line_style) {
		case SOLID_LINE:
		    break;

		case DASH_LINE:
		    if (dash_length != length && length > 0.0) {
			dash_length  = length;
			fprintf(tfp, "LT2,%.4f;\n", dash_length*2.0*cpp);
			}
		    break;

		case DOTTED_LINE:
		    if (dash_length != length && length > 0.0) {
			dash_length  = length;
			fprintf(tfp, "LT1,%.4f;\n", dash_length*2.0*cpp);
			}
		    break;
		}
	else {
	    line_style = style;
	    switch (line_style) {
		case SOLID_LINE:
		    fprintf(tfp, "LT;\n");
		    break;

		case DASH_LINE:
		    if (dash_length != length && length > 0.0)
			dash_length  = length;
		    if (dash_length > 0.0)
			fprintf(tfp, "LT2,%.4f;\n", dash_length*2.0*cpp);
		    else
			fprintf(tfp, "LT2,-1.0;\n");
		    break;

		case DOTTED_LINE:
		    if (dash_length != length && length > 0.0)
			dash_length  = length;
		    if (dash_length > 0.0)
			fprintf(tfp, "LT1,%.4f;\n", dash_length*2.0*cpp);
		    else
			fprintf(tfp, "LT1,-1.0;\n");
		    break;
		}
	    }
    }

/* 
 * set_width - issue line width commands as appropriate
 *		NOTE: for HP plotters we can't do anything
 */
static set_width(w)
int	w;
{
static	int	line_width	 = DEFAULT;	/* in pixels		 */
	line_width  = w;
	}

/* 
 * set_color - issue line color commands as appropriate
 */
static set_color(color)
int	color;
{
static	int	number		 = 0;	/* 1 <= number <= 8		*/
static	double	thickness	 = 0.3;	/* pen thickness in millimeters	*/
	if (line_color != color) {
	    line_color  = color;
	    color	= (colors + color)%colors;
	    if (number != pen_number[color]) {
		number  = pen_number[color];
		fprintf(tfp, "SP%d;\n", pen_number[color]);
		}
	    if (thickness != pen_thickness[color]) {
		thickness  = pen_thickness[color];
		fprintf(tfp, "PT%.4f;\n", pen_thickness[color]);
		}
	    }
	}

static fill_polygon(pattern, color)
int	pattern;
int	color;
{
	if (0 < pattern && pattern < patterns) {
	    int		style;
	    double	length;

	    set_color(color);
	    if (fill_pattern != pattern) {
		fill_pattern  = pattern;
		fprintf(tfp, "FT%d,%.4f,%.4f;", fill_type[pattern],
			fill_space[pattern],
			reflected ? -fill_angle[pattern]: fill_angle[pattern]);
		}
	    /*    save line style */
	    style	 = line_style;
	    length	 = dash_length;
	    fprintf(tfp, "LT%d,%.4f;FP;\n",
		    line_type[pattern], line_space[pattern]*cpi);
	    /* restore line style */
	    line_style	 = DEFAULT;
	    dash_length	 = DEFAULT;
	    set_style(style, length);
	    }
	}
	
void arc(sx, sy, cx, cy, theta, delta)
double	sx, sy, cx, cy, theta, delta;
{
	if (ibmgec)
	    if (delta == M_PI/36.0)		/* 5 degrees		*/
		fprintf(tfp, "AA%.4f,%.4f,%.4f;",
			cx, cy, theta*DPR);
	    else
		fprintf(tfp, "AA%.4f,%.4f,%.4f,%.4f;",
			cx, cy, theta*DPR, delta*DPR);
	else {
	    double	alpha;
	    if (theta < 0.0)
		delta = -fabs(delta);
	    else
		delta = fabs(delta);
	    for (alpha = delta; fabs(alpha) < fabs(theta); alpha += delta) {
		fprintf(tfp, "PA%.4f,%.4f;\n",
	    		cx + (sx - cx)*cos(alpha) - (sy - cy)*sin(alpha),
	    		cy + (sy - cy)*cos(alpha) + (sx - cx)*sin(alpha));
		}
	    fprintf(tfp, "PA%.4f,%.4f;\n",
	    	    cx + (sx - cx)*cos(theta) - (sy - cy)*sin(theta),
	    	    cy + (sy - cy)*cos(theta) + (sx - cx)*sin(theta));
	    }
	}

void genibmgl_arc(a)
F_arc	*a;
{
	if (a->thickness != 0 ||
		ibmgec && 0 <= a->fill_style && a->fill_style < patterns) {
	    double	x, y;
	    double	cx, cy, sx, sy, ex, ey;
	    double	dx1, dy1, dx2, dy2, theta;

	    set_style(a->style, a->style_val);
	    set_width(a->thickness);
	    set_color(a->pen_color);

	    cx		 = a->center.x/ppi;
	    cy		 = a->center.y/ppi;
	    sx		 = a->point[0].x/ppi;
	    sy		 = a->point[0].y/ppi;
	    ex		 = a->point[2].x/ppi;
	    ey		 = a->point[2].y/ppi;

	    dx1		 = sx - cx;
	    dy1		 = sy - cy;
	    dx2		 = ex - cx;
	    dy2		 = ey - cy;
	    
	    theta	 = atan2(dy2, dx2) - atan2(dy1, dx1);
	    if (a->direction^flipped) {
		if (theta < 0.0)
		    theta	+= 2.0*M_PI;
		}
	    else {
		if (theta > 0.0)
		    theta	-= 2.0*M_PI;
		}

	    if (a->thickness != 0 && a->back_arrow) {
		arc_tangent(cx, cy, sx, sy, a->direction^flipped, &x, &y);
		draw_arrow_head(x, y, sx, sy,
		a->back_arrow->ht/ppi, a->back_arrow->wid/ppi);
		}

	    fprintf(tfp, "PA%.4f,%.4f;PM;PD;", sx, sy);
	    arc(sx, sy, cx, cy, theta, DELTA);
	    fprintf(tfp, "PU;PM2;\n");

	    if (a->thickness != 0)
		fprintf(tfp, "EP;\n");

	    if (a->thickness != 0 && a->for_arrow) {
		arc_tangent(cx, cy, ex, ey, !a->direction^flipped, &x, &y);
		draw_arrow_head(x, y, ex, ey,
			a->for_arrow->ht/ppi, a->for_arrow->wid/ppi);
		}

	    if (0 < a->fill_style && a->fill_style < patterns)
		fill_polygon(a->fill_style, a->fill_color);
	    }
	}

void genibmgl_ellipse(e)
F_ellipse	*e;
{
	if (e->thickness != 0 ||
		ibmgec && 0 <= e->fill_style && e->fill_style < patterns) {
	    int		j;
	    double	alpha;
	    double	angle;
	    double	delta;
	    double	x0, y0;
	    double	a,  b;
	    double	x,  y;

	    set_style(e->style, e->style_val);
	    set_width(e->thickness);
	    set_color(e->pen_color);

	    a		 = e->radiuses.x/ppi;
	    b		 = e->radiuses.y/ppi;
	    x0		 = e->center.x/ppi;
	    y0		 = e->center.y/ppi;
	    angle	 = (flipped ? -e->angle: e->angle);
	    delta	 = (flipped ? -DELTA: DELTA);

	    x		 = x0 + cos(angle)*a;
	    y		 = y0 + sin(angle)*a;
	    fprintf(tfp, "PA%.4f,%.4f;PM;PD;\n", x, y);
	    for (j = 1; j <= 72; j++) { 
		alpha	 = j*delta;
		x	 = x0 + cos(angle)*a*cos(alpha)
	    		 - sin(angle)*b*sin(alpha);
		y	 = y0 + sin(angle)*a*cos(alpha)
	    		 + cos(angle)*b*sin(alpha);
		fprintf(tfp, "PA%.4f,%.4f;\n", x, y);
	    }
	    fprintf(tfp, "PU;PM2;\n");

	    if (e->thickness != 0)
		fprintf(tfp, "EP;\n");

	    if (0 < e->fill_style && e->fill_style < patterns)
		fill_polygon((int)e->fill_style, e->fill_color);
	    }
	}

void swap(i, j)
int	*i, *j;
{	int	t; t = *i; *i = *j; *j = t; }

void genibmgl_line(l)
F_line	*l;
{
	if (l->thickness != 0 ||
		ibmgec && 0 <= l->fill_style && l->fill_style < patterns) {
	    F_point	*p, *q;

	    set_style(l->style, l->style_val);
	    set_width(l->thickness);
	    set_color(l->pen_color);

	    p	 = l->points;
	    q	 = p->next;

	    switch (l->type) {
		case	T_POLYLINE:
		case	T_BOX:
		case	T_POLYGON:
		    if (q == NULL)		/* A single point line */
			fprintf(tfp, "PA%.4f,%.4f;PD;PU;\n",
				p->x/ppi, p->y/ppi);
		    else {
			if (l->thickness != 0 && l->back_arrow)
			    draw_arrow_head(q->x/ppi, q->y/ppi,
		    		    p->x/ppi, p->y/ppi,
				    l->back_arrow->ht/ppi,
				    l->back_arrow->wid/ppi);

			fprintf(tfp, "PA%.4f,%.4f;PM;PD%.4f,%.4f;\n",
				p->x/ppi, p->y/ppi,
				q->x/ppi, q->y/ppi);
			while (q->next != NULL) {
			    p	 = q;
			    q	 = q->next;
			    fprintf(tfp, "PA%.4f,%.4f;\n",
				    q->x/ppi, q->y/ppi);
			    }
			fprintf(tfp, "PU;PM2;\n");

			if (l->thickness != 0)
			    fprintf(tfp, "EP;\n");

			if (l->thickness != 0 && l->for_arrow)
		    	    draw_arrow_head(p->x/ppi, p->y/ppi,
				    q->x/ppi, q->y/ppi,
				    l->for_arrow->ht/ppi,
				    l->for_arrow->wid/ppi);

			if (0 < l->fill_style && l->fill_style < patterns)
			    fill_polygon((int)l->fill_style, l->fill_color);
			}
		    break;

		case	T_ARC_BOX: {
		    int		llx, lly, urx, ury;
		    double	 x0,  y0,  x1,  y1;
		    double	dx, dy, angle;

		    llx	 = urx	= p->x;
		    lly	 = ury	= p->y;
		    while ((p = p->next) != NULL) {
			if (llx > p->x)
			    llx = p->x;
			if (urx < p->x)
			    urx = p->x;
			if (lly > p->y)
			    lly = p->y;
			if (ury < p->y)
			    ury = p->y;
			}

		    x0	 = llx/ppi;
		    x1	 = urx/ppi;
		    dx	 = l->radius/ppi;
		    if (flipped) {
			y0	 = ury/ppi;
			y1	 = lly/ppi;
			dy	 = -dx;
			angle	 = -M_PI/2.0;
			}
		    else {
			y0	 = lly/ppi;
			y1	 = ury/ppi;
			dy	 =  dx;
			angle	 =  M_PI/2.0;
			}

		    fprintf(tfp, "PA%.4f,%.4f;PM;PD;\n",  x0, y0 + dy);
		    arc(x0, y0 + dy, x0 + dx, y0 + dy, angle, DELTA);
		    fprintf(tfp, "PA%.4f,%.4f;\n", x1 - dx, y0);
		    arc(x1 - dx, y0, x1 - dx, y0 + dy, angle, DELTA);
		    fprintf(tfp, "PA%.4f,%.4f;\n", x1, y1 - dy);
		    arc(x1, y1 - dy, x1 - dx, y1 - dy, angle, DELTA);
		    fprintf(tfp, "PA%.4f,%.4f;\n", x0 + dx, y1);
		    arc(x0 + dx, y1, x0 + dx, y1 - dy, angle, DELTA);
		    fprintf(tfp, "PA%.4f,%.4f;PU;PM2;\n", x0, y0 + dy);

		    if (l->thickness != 0)
			fprintf(tfp, "EP;\n");

		    if (0 < l->fill_style && l->fill_style < patterns)
			fill_polygon((int)l->fill_style, l->fill_color);
		    }
		    break;

		case	T_PIC_BOX:
		    break;
		}
	    }
	}

#define		THRESHOLD	.05	/* inch */

static bezier_spline(a0, b0, a1, b1, a2, b2, a3, b3)
double	a0, b0, a1, b1, a2, b2, a3, b3;
{
	double	x0, y0, x3, y3;
	double	sx1, sy1, sx2, sy2, tx, ty, tx1, ty1, tx2, ty2, xmid, ymid;

	x0 = a0; y0 = b0;
	x3 = a3; y3 = b3;
	if (fabs(x0 - x3) < THRESHOLD && fabs(y0 - y3) < THRESHOLD)
	    fprintf(tfp, "PA%.4f,%.4f;\n", x3, y3);

	else {
	    tx   = (a1  + a2 )/2.0;	ty   = (b1  + b2 )/2.0;
	    sx1  = (x0  + a1 )/2.0;	sy1  = (y0  + b1 )/2.0;
	    sx2  = (sx1 + tx )/2.0;	sy2  = (sy1 + ty )/2.0;
	    tx2  = (a2  + x3 )/2.0;	ty2  = (b2  + y3 )/2.0;
	    tx1  = (tx2 + tx )/2.0;	ty1  = (ty2 + ty )/2.0;
	    xmid = (sx2 + tx1)/2.0;	ymid = (sy2 + ty1)/2.0;

	    bezier_spline(x0, y0, sx1, sy1, sx2, sy2, xmid, ymid);
	    bezier_spline(xmid, ymid, tx1, ty1, tx2, ty2, x3, y3);
	    }
	}

static void genibmgl_itp_spline(s)
F_spline	*s;
{
	F_point		*p1, *p2;
	F_control	*cp1, *cp2;
	double		x1, x2, y1, y2;

	p1 = s->points;
	cp1 = s->controls;
	x2 = p1->x/ppi; y2 = p1->y/ppi;

	if (s->thickness != 0 && s->back_arrow)
	    draw_arrow_head(cp1->rx/ppi, cp1->ry/ppi, x2, y2,
		    s->back_arrow->ht/ppi, s->back_arrow->wid/ppi);

	fprintf(tfp, "PA%.4f,%.4f;PD;\n", x2, y2);
	for (p2 = p1->next, cp2 = cp1->next; p2 != NULL;
		p1 = p2, cp1 = cp2, p2 = p2->next, cp2 = cp2->next) {
	    x1	 = x2;
	    y1	 = y2;
	    x2	 = p2->x/ppi;
	    y2	 = p2->y/ppi;
	    bezier_spline(x1, y1, (double)cp1->rx/ppi, cp1->ry/ppi,
		(double)cp2->lx/ppi, cp2->ly/ppi, x2, y2);
	    }
	fprintf(tfp, "PU;\n");

	if (s->thickness != 0 && s->for_arrow)
	    draw_arrow_head(cp1->lx/ppi, cp1->ly/ppi, x2, y2,
		    s->for_arrow->ht/ppi, s->for_arrow->wid/ppi);
	}

static quadratic_spline(a1, b1, a2, b2, a3, b3, a4, b4)
double	a1, b1, a2, b2, a3, b3, a4, b4;
{
	double	x1, y1, x4, y4;
	double	xmid, ymid;

	x1	 = a1; y1 = b1;
	x4	 = a4; y4 = b4;
	xmid	 = (a2 + a3)/2.0;
	ymid	 = (b2 + b3)/2.0;
	if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD)
	    fprintf(tfp, "PA%.4f,%.4f;\n", xmid, ymid);
	else {
	    quadratic_spline(x1, y1, ((x1+a2)/2.0), ((y1+b2)/2.0),
		((3.0*a2+a3)/4.0), ((3.0*b2+b3)/4.0), xmid, ymid);
	    }

	if (fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD)
	    fprintf(tfp, "PA%.4f,%.4f;\n", x4, y4);
	else {
	    quadratic_spline(xmid, ymid, ((a2+3.0*a3)/4.0), ((b2+3.0*b3)/4.0),
			((a3+x4)/2.0), ((b3+y4)/2.0), x4, y4);
	    }
	}

static void genibmgl_ctl_spline(s)
F_spline	*s;
{
	F_point	*p;
	double	cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
	double	x1, y1, x2, y2;

	p	 = s->points;
	x1	 = p->x/ppi;
	y1	 = p->y/ppi;
	p	 = p->next;
	x2	 = p->x/ppi;
	y2	 = p->y/ppi;
	cx1	 = (x1 + x2)/2.0;
	cy1	 = (y1 + y2)/2.0;
	cx2	 = (x1 + 3.0*x2)/4.0;
	cy2	 = (y1 + 3.0*y2)/4.0;

	if (closed_spline(s))
	    fprintf(tfp, "PA%.4f,%.4f;PD;\n ", cx1, cy1);
	else {
	    if (s->thickness != 0 && s->back_arrow)
		draw_arrow_head(cx1, cy1, x1, y1,
			s->back_arrow->ht/ppi, s->back_arrow->wid/ppi);
	    fprintf(tfp, "PA%.4f,%.4f;PD%.4f,%.4f;\n",
		    x1, y1, cx1, cy1);
	    }

	for (p = p->next; p != NULL; p = p->next) {
	    x1	 = x2;
	    y1	 = y2;
	    x2	 = p->x/ppi;
	    y2	 = p->y/ppi;
	    cx3	 = (3.0*x1 + x2)/4.0;
	    cy3	 = (3.0*y1 + y2)/4.0;
	    cx4	 = (x1 + x2)/2.0;
	    cy4	 = (y1 + y2)/2.0;
	    quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
	    cx1	 = cx4;
	    cy1	 = cy4;
	    cx2	 = (x1 + 3.0*x2)/4.0;
	    cy2	 = (y1 + 3.0*y2)/4.0;
	    }
	x1	 = x2; 
	y1	 = y2;
	p	 = s->points->next;
	x2	 = p->x/ppi;
	y2	 = p->y/ppi;
	cx3	 = (3.0*x1 + x2)/4.0;
	cy3	 = (3.0*y1 + y2)/4.0;
	cx4	 = (x1 + x2)/2.0;
	cy4	 = (y1 + y2)/2.0;
	if (closed_spline(s)) {
	    quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
	    fprintf(tfp, "PU;\n");
	    }
	else {
	    fprintf(tfp, "PA%.4f,%.4f;PU;\n", x1, y1);
	    if (s->thickness != 0 && s->for_arrow)
	    	draw_arrow_head(cx1, cy1, x1, y1,
			s->for_arrow->ht/ppi, s->for_arrow->wid/ppi);
	    }
	}

void genibmgl_spline(s)
F_spline	*s;
{
	if (s->thickness != 0) {
	    set_style(s->style, s->style_val);
	    set_width(s->thickness);
	    set_color(s->pen_color);

	    if (int_spline(s))
		genibmgl_itp_spline(s);
	    else
		genibmgl_ctl_spline(s);

	    }
	if (0 < s->fill_style && s->fill_style < patterns)
	    fprintf(stderr, "Spline area fill not implemented\n");
}

#define	FONT(T) ((-1 < (T) && (T) < fonts) ? (T): fonts)
void genibmgl_text(t)
F_text	*t;
{
static	int	font	 = DEFAULT;	/* font				*/
static	int	size	 = DEFAULT;	/* font size	    in points	*/
static	int	cs	 = 0;		/* standard  character set	*/
static	int	ca	 = 0;		/* alternate character set	*/
static	double	theta	 = 0.0;		/* character slant  in degrees	*/
static	double	angle	 = 0.0;		/* label direction  in radians	*/
	double	width;			/* character width  in centimeters */
	double	height;			/* character height in centimeters */

	if (font != FONT(t->font)) {
	    font  = FONT(t->font);
	    if (cs != standard[font]) {
		cs  = standard[font];
		fprintf(tfp, "CS%d;", cs);
		}
	    if (ca != alternate[font]) {
		ca  = alternate[font];
		fprintf(tfp, "CA%d;", ca);
		}
	    if (theta != slant[font]) {
		theta  = slant[font];
		fprintf(tfp, "SL%.4f;", tan(theta*M_PI/180.0));
		}
	    }
	if (size != t->size) {
	    size  = t->size;
	    width	 = size*wcmpp*wide[font];
	    height	 = size*hcmpp*high[font];
	    fprintf(tfp, "SI%.4f,%.4f;", width*mag, height*mag);
	    }
	if (angle != t->angle) {
	    angle  = t->angle;
	    fprintf(tfp, "DI%.4f,%.4f;",
		    cos(angle), sin(reflected ? -angle: angle));
	    }
	set_color(t->color);

	fprintf(tfp, "PA%.4f,%.4f;\n",
		t->base_x/ppi, t->base_y/ppi);

	switch (t->type) {
	    case DEFAULT:
	    case T_LEFT_JUSTIFIED:
		break;
	    case T_CENTER_JUSTIFIED:
		fprintf(tfp, "CP%.4f,0.0;", -(double)(strlen(t->cstring)/2.0));
		break;
	    case T_RIGHT_JUSTIFIED:
		fprintf(tfp, "CP%.4f,0.0;", -(double)(strlen(t->cstring)));
		break;
	    default:
		fprintf(stderr, "unknown text position type\n");
		exit(1);
	    }    

	fprintf(tfp, "LB%s\003\n", t->cstring);
	}

void genibmgl_end()
{
	/* IBMGL ending */
	fprintf(tfp, "PU;SP;IN;\n");
}

struct driver dev_ibmgl = {
     	genibmgl_option,
	genibmgl_start,
	genibmgl_arc,
	genibmgl_ellipse,
	genibmgl_line,
	genibmgl_spline,
	genibmgl_text,
	genibmgl_end,
	EXCLUDE_TEXT
	};