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#ifndef lint
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static const char RCSid[] = "$Id: mplot.c,v 1.3 2003/11/15 02:13:37 schorsch Exp $";
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#endif
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/*
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* Plotting routines for meta-files to line-at-a-time printers
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*/
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include "platform.h"
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#include "meta.h"
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#include "plot.h"
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#include "span.h"
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int minwidth = 0;
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static PLIST inqueue = {NULL, NULL};
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static PRIMITIVE nextp;
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static void initplot(void);
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static void plotspan(FILE *infp);
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static void doglobal(PRIMITIVE *g);
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static void doprim(PRIMITIVE *p);
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static void outputspan(void);
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static void tfill(PRIMITIVE *p);
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static void fill(int attrib, int xmin, int ymin, int xmax, int ymax);
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static void paintline(int x, int y, int run, int rise, int hrad, int vrad,
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int lpat, long run2, long rise2, int n);
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static void nextspan(void);
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void
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plot( /* plot meta-file */
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FILE *infp
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)
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{
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do {
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readp(&nextp, infp);
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initplot();
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while (inqueue.ptop != NULL || isprim(nextp.com))
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plotspan(infp);
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doglobal(&nextp);
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fargs(&nextp);
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} while (nextp.com != PEOF);
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}
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void
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initplot(void) /* initialize this plot */
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{
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thispage();
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outspan.xleft = 0;
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outspan.xright = dxsiz - 1;
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outspan.ytop = dysiz + linhite - 1;
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outspan.ybot = dysiz;
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}
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void
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doglobal( /* execute a global command */
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PRIMITIVE *g
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)
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{
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char c;
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int tty;
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switch (g->com) {
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case PEOF:
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break;
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case PDRAW:
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fflush(stdout);
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break;
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case PEOP:
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if (g->arg0 & 0200) /* advance page */
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nextpage();
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else if (g->arg0 == 3) /* continue down */
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contpage();
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else
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error(USER, "illegal continue direction in doglobal");
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break;
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case PPAUS:
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fflush(stdout);
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tty = open(TTY, O_RDWR);
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if (g->args != NULL) {
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write(tty, g->args, strlen(g->args));
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write(tty, " - (hit return to continue)", 27);
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} else
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write(tty, "\007", 1);
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do {
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c = '\n';
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read(tty, &c, 1);
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} while (c != '\n');
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close(tty);
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break;
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case PSET:
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set(g->arg0, g->args);
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break;
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case PUNSET:
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unset(g->arg0);
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break;
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case PRESET:
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reset(g->arg0);
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break;
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default:
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sprintf(errmsg, "unknown command '%c' in doglobal", g->com);
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error(WARNING, errmsg);
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break;
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}
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}
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void
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plotspan( /* plot next span */
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FILE *infp
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)
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{
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PLIST lastinq;
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register PRIMITIVE *p;
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/* clear span */
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nextspan();
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/* plot from queue */
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lastinq.ptop = inqueue.ptop;
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lastinq.pbot = inqueue.pbot;
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inqueue.ptop = inqueue.pbot = NULL;
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while ((p = pop(&lastinq)) != NULL) {
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doprim(p);
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pfree(p);
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}
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/* plot from file */
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while (isprim(nextp.com) && CONV(nextp.xy[YMX],dysiz) >= outspan.ybot) {
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doprim(&nextp);
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fargs(&nextp);
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readp(&nextp, infp);
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}
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/* print out span */
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outputspan();
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}
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void
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nextspan(void) /* prepare next span */
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{
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register int i;
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register char *colp, *tcolp;
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if (spanmin <= spanmax) { /* clear span */
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i = nrows*dxsiz;
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colp = outspan.cols;
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tcolp = outspan.tcols;
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while (i--)
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*colp++ = *tcolp++ = '\0';
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}
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outspan.ytop -= linhite; /* advance to next */
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outspan.ybot -= linhite;
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spanmin = dxsiz;
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spanmax = 0;
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}
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void
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outputspan(void) /* output span to printer */
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{
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register int i;
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register char *colp, *tcolp;
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if (spanmin <= spanmax) { /* overlay spans */
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i = nrows*dxsiz;
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colp = outspan.cols;
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tcolp = outspan.tcols;
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while (i--)
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*colp++ |= *tcolp++;
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}
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printspan(); /* print span */
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}
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void
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doprim( /* plot primitive */
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register PRIMITIVE *p
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)
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{
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register PRIMITIVE *newp;
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switch (p->com) {
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case PLSEG:
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plotlseg(p);
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break;
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case PRFILL:
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fill((p->arg0&0103) | (pati[(p->arg0>>2)&03]<<2),
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CONV(p->xy[XMN],dxsiz),CONV(p->xy[YMN],dysiz),
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CONV(p->xy[XMX],dxsiz)+(p->arg0&0100?-1:0),
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CONV(p->xy[YMX],dysiz)+(p->arg0&0100?-1:0));
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break;
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case PTFILL:
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tfill(p);
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break;
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case PMSTR:
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printstr(p);
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break;
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default:
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sprintf(errmsg, "unknown command '%c' in doprim", p->com);
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error(WARNING, errmsg);
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return;
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}
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if (CONV(p->xy[YMN],dysiz) < outspan.ybot) { /* save for next time */
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if ((newp = palloc()) == NULL)
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error(SYSTEM, "memory limit exceeded in doprim");
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mcopy((char *)newp, (char *)p, sizeof(PRIMITIVE));
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newp->args = savestr(p->args);
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add(newp, &inqueue);
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}
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}
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void
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plotlseg( /* plot a line segment */
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register PRIMITIVE *p
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)
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{
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register int ti;
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long run2 = 0L, rise2 = 0L;
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int x, y, run, rise, xstop, ystop, hrad, vrad, lpat, n;
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/* compute line pattern */
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lpat = (p->arg0 >> 2) & 014;
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if (p->arg0 & 0100 && lpat != 0)
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lpat += 014;
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lpat |= p->arg0 & 03;
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ti = (p->arg0 >> 2) & 03; /* compute line radius */
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ti = WIDTH(ti) / 2;
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hrad = CONV(ti, dxsiz);
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vrad = CONV(ti, dysiz);
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if (hrad < minwidth)
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hrad = minwidth;
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if (vrad < minwidth)
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vrad = minwidth;
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x = CONV(p->xy[XMX], dxsiz); /* start at top */
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y = CONV(p->xy[YMX], dysiz);
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run = CONV(p->xy[XMN], dxsiz) - x;
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rise = CONV(p->xy[YMN], dysiz) - y;
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if (p->arg0 & 0100) /* slope < 0; reverse x */
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x -= (run = -run);
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xstop = x + run; /* compute end point */
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ystop = y + rise;
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if ((ti = outspan.ytop+vrad+1-y) < 0) { /* adjust to top of span */
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run2 = rise2 = (long)ti*run;
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x += rise2/rise;
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y += ti;
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}
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if ((ti = outspan.ybot-vrad-1-ystop) > 0) { /* adjust to bottom of span */
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xstop += (long)ti*run/rise;
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ystop += ti;
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}
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if (abs(run) > -rise)
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n = abs(xstop - x);
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else
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n = y - ystop;
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paintline(x, y, run, rise, hrad, vrad, lpat, run2, rise2, n);
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}
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/*
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* This routine paints a line with calls to fill(). The line can
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* start and end at arbitrary points on a longer line segment.
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*/
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void
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paintline(
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register int x,
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register int y,
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int run,
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int rise,
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int hrad,
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int vrad,
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int lpat,
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long run2,
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long rise2,
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int n
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)
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{
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int xstep, ystep;
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if (run >= 0)
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xstep = 1;
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else {
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xstep = -1;
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run = -run;
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}
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if (rise >= 0)
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ystep = 1;
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else {
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ystep = -1;
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rise = -rise;
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}
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if (n < 0)
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n = max(run, rise);
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if (run > rise)
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while (n >= 0)
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if (run2 >= rise2) {
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fill(lpat, x-hrad, y-vrad, x+hrad, y+vrad);
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n--;
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x += xstep;
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rise2 += rise;
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} else {
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y += ystep;
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run2 += run;
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}
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else
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while (n >= 0)
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if (rise2 >= run2) {
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fill(lpat, x-hrad, y-vrad, x+hrad, y+vrad);
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n--;
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y += ystep;
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run2 += run;
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} else {
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x += xstep;
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rise2 += rise;
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}
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}
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void
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tfill( /* fill a triangle */
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register PRIMITIVE *p
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)
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{
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register int x, txmin, txmax;
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int xmn, ymn, tpat;
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long xsz, ysz;
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xmn = CONV(p->xy[XMN], dxsiz);
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xsz = CONV(p->xy[XMX], dxsiz) - xmn;
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ymn = CONV(p->xy[YMN], dysiz);
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ysz = CONV(p->xy[YMX], dysiz) - ymn;
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if (xsz <= 0 || ysz <= 0)
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return;
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txmin = (outspan.ybot - ymn)*xsz/ysz;
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txmax = (outspan.ytop - ymn)*xsz/ysz;
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if (p->arg0 & 020) { /* up or down */
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x = txmin;
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txmin = xsz - txmax;
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txmax = xsz - x;
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}
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txmin += xmn;
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txmax += xmn;
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txmin = max(txmin, xmn);
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txmax = min(txmax, xmn + (int)xsz - 1);
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tpat = (p->arg0&0103) | (pati[(p->arg0>>2)&03]<<2);
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if (p->arg0 & 040) { /* left or down */
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fill(tpat, xmn, ymn, txmin - 1, ymn + (int)ysz - 1);
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for (x = txmin; x <= txmax; x++)
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if (p->arg0 & 020) /* down */
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fill(tpat, x, ymn, x, (int)(ysz-(x-xmn)*ysz/xsz) + ymn - 1);
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else /* left */
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fill(tpat, x, (int)((x-xmn)*ysz/xsz) + ymn, x, ymn + (int)ysz - 1);
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} else { /* right or up */
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for (x = txmin; x <= txmax; x++)
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if (p->arg0 & 020) /* up */
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fill(tpat, x, (int)(ysz-(x-xmn)*ysz/xsz) + ymn, x, ymn + (int)ysz - 1);
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else /* right */
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fill(tpat, x, ymn, x, (int)((x-xmn)*ysz/xsz) + ymn - 1);
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| 408 |
fill(tpat, txmax + 1, ymn, xmn + (int)xsz - 1, ymn + (int)ysz - 1);
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| 409 |
}
|
| 410 |
}
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| 411 |
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| 412 |
|
| 413 |
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| 414 |
void
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fill( /* fill rectangle with attribute */
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| 416 |
int attrib,
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int xmin,
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| 418 |
int ymin,
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| 419 |
int xmax,
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| 420 |
int ymax
|
| 421 |
)
|
| 422 |
{
|
| 423 |
int filpat;
|
| 424 |
int rpos;
|
| 425 |
unsigned char *pattr;
|
| 426 |
register char *colp;
|
| 427 |
register int i;
|
| 428 |
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| 429 |
xmin = max(xmin, outspan.xleft) - outspan.xleft;
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| 430 |
ymin = max(ymin, outspan.ybot) - outspan.ybot;
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| 431 |
xmax = min(xmax, outspan.xright) - outspan.xleft;
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| 432 |
ymax = min(ymax, outspan.ytop) - outspan.ybot;
|
| 433 |
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| 434 |
for (rpos = 0; rpos < nrows; rpos++)
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| 435 |
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| 436 |
if (rpos >= ymin >> 3 && rpos <= ymax >> 3) {
|
| 437 |
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| 438 |
filpat = 0377;
|
| 439 |
if (rpos == ymin >> 3) {
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| 440 |
i = ymin & 07;
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| 441 |
filpat = (filpat >> i) << i;
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| 442 |
}
|
| 443 |
if (rpos == ymax >> 3) {
|
| 444 |
i = ~ymax & 07;
|
| 445 |
filpat = ((filpat << i) & 0377) >> i;
|
| 446 |
}
|
| 447 |
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| 448 |
pattr = pattern[(attrib&074)>>2]
|
| 449 |
[((outspan.ybot>>3)+rpos)%(PATSIZE>>3)];
|
| 450 |
|
| 451 |
if (attrib & 0100) {
|
| 452 |
colp = &outspan.tcols[rpos*dxsiz + xmin];
|
| 453 |
for (i = xmin; i <= xmax; i++)
|
| 454 |
*colp++ ^= filpat & pattr[i%PATSIZE];
|
| 455 |
} else {
|
| 456 |
colp = &outspan.cols[rpos*dxsiz + xmin];
|
| 457 |
for (i = xmin; i <= xmax; i++)
|
| 458 |
*colp++ |= filpat & pattr[i%PATSIZE];
|
| 459 |
}
|
| 460 |
|
| 461 |
spanmin = min(xmin, spanmin);
|
| 462 |
spanmax = max(xmax, spanmax);
|
| 463 |
}
|
| 464 |
|
| 465 |
}
|
