plan9port

pltroff.c (7600B)

---

 #include <stdio.h>
 #include <math.h>
 #include <string.h>
 #include "pic.h"
 extern int dbg;
 
 #define	abs(n)	(n >= 0 ? n : -(n))
 #define	max(x,y)	((x)>(y) ? (x) : (y))
 
 char	*textshift = "\\v'.2m'";	/* move text this far down */
 
 /* scaling stuff defined by s command as X0,Y0 to X1,Y1 */
 /* output dimensions set by -l,-w options to 0,0 to hmax, vmax */
 /* default output is 6x6 inches */
 
 
 double	xscale;
 double	yscale;
 
 double	hpos	= 0;	/* current horizontal position in output coordinate system */
 double	vpos	= 0;	/* current vertical position; 0 is top of page */
 
 double	htrue	= 0;	/* where we really are */
 double	vtrue	= 0;
 
 double	X0, Y0;		/* left bottom of input */
 double	X1, Y1;		/* right top of input */
 
 double	hmax;		/* right end of output */
 double	vmax;		/* top of output (down is positive) */
 
 extern	double	deltx;
 extern	double	delty;
 extern	double	xmin, ymin, xmax, ymax;
 
 double	xconv(double), yconv(double), xsc(double), ysc(double);
 void	space(double, double, double, double);
 void	hgoto(double), vgoto(double), hmot(double), vmot(double);
 void	move(double, double), movehv(double, double);
 void	cont(double, double);
 
 void openpl(char *s)	/* initialize device; s is residue of .PS invocation line */
 {
 	double maxw, maxh, ratio = 1;
 	double odeltx = deltx, odelty = delty;
 
 	hpos = vpos = 0;
 	maxw = getfval("maxpswid");
 	maxh = getfval("maxpsht");
 	if (deltx > maxw) {	/* shrink horizontal */
 		ratio = maxw / deltx;
 		deltx *= ratio;
 		delty *= ratio;
 	}
 	if (delty > maxh) {	/* shrink vertical */
 		ratio = maxh / delty;
 		deltx *= ratio;
 		delty *= ratio;
 	}
 	if (ratio != 1) {
 		fprintf(stderr, "pic: %g X %g picture shrunk to", odeltx, odelty);
 		fprintf(stderr, " %g X %g\n", deltx, delty);
 	}
 	space(xmin, ymin, xmax, ymax);
 	printf("... %g %g %g %g\n", xmin, ymin, xmax, ymax);
 	printf("... %.3fi %.3fi %.3fi %.3fi\n",
 		xconv(xmin), yconv(ymin), xconv(xmax), yconv(ymax));
 	printf(".nr 00 \\n(.u\n");
 	printf(".nf\n");
 	printf(".PS %.3fi %.3fi %s", yconv(ymin), xconv(xmax), s);
 		/* assumes \n comes as part of s */
 }
 
 void space(double x0, double y0, double x1, double y1)	/* set limits of page */
 {
 	X0 = x0;
 	Y0 = y0;
 	X1 = x1;
 	Y1 = y1;
 	xscale = deltx == 0.0 ? 1.0 : deltx / (X1-X0);
 	yscale = delty == 0.0 ? 1.0 : delty / (Y1-Y0);
 }
 
 double xconv(double x)	/* convert x from external to internal form */
 {
 	return (x-X0) * xscale;
 }
 
 double xsc(double x)	/* convert x from external to internal form, scaling only */
 {
 
 	return (x) * xscale;
 }
 
 double yconv(double y)	/* convert y from external to internal form */
 {
 	return (Y1-y) * yscale;
 }
 
 double ysc(double y)	/* convert y from external to internal form, scaling only */
 {
 	return (y) * yscale;
 }
 
 void closepl(char *PEline)	/* clean up after finished */
 {
 	movehv(0.0, 0.0);	/* get back to where we started */
 	if (strchr(PEline, 'F') == NULL) {
 		printf(".sp 1+%.3fi\n", yconv(ymin));
 	}
 	printf("%s\n", PEline);
 	printf(".if \\n(00 .fi\n");
 }
 
 void move(double x, double y)	/* go to position x, y in external coords */
 {
 	hgoto(xconv(x));
 	vgoto(yconv(y));
 }
 
 void movehv(double h, double v)	/* go to internal position h, v */
 {
 	hgoto(h);
 	vgoto(v);
 }
 
 void hmot(double n)	/* generate n units of horizontal motion */
 {
 	hpos += n;
 }
 
 void vmot(double n)	/* generate n units of vertical motion */
 {
 	vpos += n;
 }
 
 void hgoto(double n)
 {
 	hpos = n;
 }
 
 void vgoto(double n)
 {
 	vpos = n;
 }
 
 void hvflush(void)	/* get to proper point for output */
 {
 	if (fabs(hpos-htrue) >= 0.0005) {
 		printf("\\h'%.3fi'", hpos - htrue);
 		htrue = hpos;
 	}
 	if (fabs(vpos-vtrue) >= 0.0005) {
 		printf("\\v'%.3fi'", vpos - vtrue);
 		vtrue = vpos;
 	}
 }
 
 void flyback(void)	/* return to upper left corner (entry point) */
 {
 	printf(".sp -1\n");
 	htrue = vtrue = 0;
 }
 
 void printlf(int n, char *f)
 {
 	if (f)
 		printf(".lf %d %s\n", n, f);
 	else
 		printf(".lf %d\n", n);
 }
 
 void troff(char *s)	/* output troff right here */
 {
 	printf("%s\n", s);
 }
 
 void label(char *s, int t, int nh)	/* text s of type t nh half-lines up */
 {
 	int q;
 	char *p;
 
 	if (!s)
 		return;
 	hvflush();
 	dprintf("label: %s %o %d\n", s, t, nh);
 	printf("%s", textshift);	/* shift down and left */
 	if (t & ABOVE)
 		nh++;
 	else if (t & BELOW)
 		nh--;
 	if (nh)
 		printf("\\v'%du*\\n(.vu/2u'", -nh);
 	/* just in case the text contains a quote: */
 	q = 0;
 	for (p = s; *p; p++)
 		if (*p == '\'') {
 			q = 1;
 			break;
 		}
 	t &= ~(ABOVE|BELOW);
 	if (t & LJUST) {
 		printf("%s", s);
 	} else if (t & RJUST) {
 		if (q)
 			printf("\\h\\(ts-\\w\\(ts%s\\(tsu\\(ts%s", s, s);
 		else
 			printf("\\h'-\\w'%s'u'%s", s, s);
 	} else {	/* CENTER */
 		if (q)
 			printf("\\h\\(ts-\\w\\(ts%s\\(tsu/2u\\(ts%s", s, s);
 		else
 			printf("\\h'-\\w'%s'u/2u'%s", s, s);
 	}
 	printf("\n");
 	flyback();
 }
 
 void line(double x0, double y0, double x1, double y1)	/* draw line from x0,y0 to x1,y1 */
 {
 	move(x0, y0);
 	cont(x1, y1);
 }
 
 void arrow(double x0, double y0, double x1, double y1, double w, double h,
 	 double ang, int nhead) 	/* draw arrow (without shaft) */
 {
 	double alpha, rot, drot, hyp;
 	double dx, dy;
 	int i;
 
 	rot = atan2(w / 2, h);
 	hyp = sqrt(w/2 * w/2 + h * h);
 	alpha = atan2(y1-y0, x1-x0) + ang;
 	if (nhead < 2)
 		nhead = 2;
 	dprintf("rot=%g, hyp=%g, alpha=%g\n", rot, hyp, alpha);
 	for (i = nhead-1; i >= 0; i--) {
 		drot = 2 * rot / (double) (nhead-1) * (double) i;
 		dx = hyp * cos(alpha + PI - rot + drot);
 		dy = hyp * sin(alpha + PI - rot + drot);
 		dprintf("dx,dy = %g,%g\n", dx, dy);
 		line(x1+dx, y1+dy, x1, y1);
 	}
 }
 
 double lastgray = 0;
 
 void fillstart(double v)	/* this works only for postscript, obviously. */
 {				/* uses drechsler's dpost conventions... */
 	hvflush();
 	printf("\\X'BeginObject %g setgray'\n", v);
 	lastgray = v;
 	flyback();
 }
 
 void fillend(int vis, int fill)
 {
 	hvflush();
 	printf("\\X'EndObject gsave eofill grestore %g setgray %s'\n",
 		!vis ? lastgray : 0.0,
 		vis ? "stroke" : "");
 	/* for dashed: [50] 0 setdash just before stroke. */
 	lastgray = 0;
 	flyback();
 }
 
 void box(double x0, double y0, double x1, double y1)
 {
 	move(x0, y0);
 	cont(x0, y1);
 	cont(x1, y1);
 	cont(x1, y0);
 	cont(x0, y0);
 }
 
 void cont(double x, double y)	/* continue line from here to x,y */
 {
 	double h1, v1;
 	double dh, dv;
 
 	h1 = xconv(x);
 	v1 = yconv(y);
 	dh = h1 - hpos;
 	dv = v1 - vpos;
 	hvflush();
 	printf("\\D'l%.3fi %.3fi'\n", dh, dv);
 	flyback();	/* expensive */
 	hpos = h1;
 	vpos = v1;
 }
 
 void circle(double x, double y, double r)
 {
 	move(x-r, y);
 	hvflush();
 	printf("\\D'c%.3fi'\n", xsc(2 * r));
 	flyback();
 }
 
 void spline(double x, double y, double n, ofloat *p, int dashed, double ddval)
 {
 	int i;
 	double dx, dy;
 	double xerr, yerr;
 
 	move(x, y);
 	hvflush();
 	xerr = yerr = 0.0;
 	printf("\\D'~");
 	for (i = 0; i < 2 * n; i += 2) {
 		dx = xsc(xerr += p[i]);
 		xerr -= dx/xscale;
 		dy = ysc(yerr += p[i+1]);
 		yerr -= dy/yscale;
 		printf(" %.3fi %.3fi", dx, -dy);	/* WATCH SIGN */
 	}
 	printf("'\n");
 	flyback();
 }
 
 void ellipse(double x, double y, double r1, double r2)
 {
 	double ir1, ir2;
 
 	move(x-r1, y);
 	hvflush();
 	ir1 = xsc(r1);
 	ir2 = ysc(r2);
 	printf("\\D'e%.3fi %.3fi'\n", 2 * ir1, 2 * abs(ir2));
 	flyback();
 }
 
 void arc(double x, double y, double x0, double y0, double x1, double y1)	/* draw arc with center x,y */
 {
 
 	move(x0, y0);
 	hvflush();
 	printf("\\D'a%.3fi %.3fi %.3fi %.3fi'\n",
 		xsc(x-x0), -ysc(y-y0), xsc(x1-x), -ysc(y1-y));	/* WATCH SIGNS */
 	flyback();
 }
 
 void dot(void) {
 	hvflush();
 	/* what character to draw here depends on what's available. */
 	/* on the 202, l. is good but small. */
 	/* in general, use a smaller, shifted period and hope */
 
 	printf("\\&\\f1\\h'-.1m'\\v'.03m'\\s-3.\\s+3\\fP\n");
 	flyback();
 }