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