1 files changed, 357 insertions, 0 deletions
diff --git a/src/cmd/pic/pltroff.c b/src/cmd/pic/pltroff.c
new file mode 100644
index 00000000..d3e3151b
--- /dev/null
+++ b/src/cmd/pic/pltroff.c
@@ -0,0 +1,357 @@
+#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;
+}
+
+double fabs(double x)
+{
+	return x < 0 ? -x : x;
+}
+
+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();
+}