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#ifndef lint |
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static const char RCSid[] = "$Id: mplot.c,v 1.1 2003/02/22 02:07:26 greg 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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|
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|
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#include <fcntl.h> |
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|
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#include "meta.h" |
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|
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#include "plot.h" |
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|
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#include "span.h" |
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|
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|
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|
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int minwidth = 0; |
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|
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static PLIST inqueue = {NULL, NULL}; |
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|
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static PRIMITIVE nextp; |
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|
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|
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|
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plot(infp) /* plot meta-file */ |
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|
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FILE *infp; |
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|
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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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} |
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|
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|
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|
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|
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|
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initplot() /* initialize this plot */ |
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|
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{ |
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|
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thispage(); |
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outspan.xleft = 0; |
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outspan.xright = dxsize - 1; |
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outspan.ytop = dysize + linhite - 1; |
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outspan.ybot = dysize; |
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|
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} |
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|
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|
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|
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|
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|
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doglobal(g) /* execute a global command */ |
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|
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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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|
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switch (g->com) { |
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|
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case PEOF: |
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break; |
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|
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case PDRAW: |
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fflush(stdout); |
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break; |
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|
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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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|
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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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|
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case PSET: |
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set(g->arg0, g->args); |
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break; |
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|
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case PUNSET: |
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unset(g->arg0); |
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break; |
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|
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case PRESET: |
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reset(g->arg0); |
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break; |
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|
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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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} |
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|
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|
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|
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|
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|
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plotspan(infp) /* plot next span */ |
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|
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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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|
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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],dysize) >= 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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} |
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|
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|
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|
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|
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|
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nextspan() /* prepare next span */ |
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|
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{ |
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register int i; |
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register char *colp, *tcolp; |
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|
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if (spanmin <= spanmax) { /* clear span */ |
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|
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i = nrows*dxsize; |
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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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|
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outspan.ytop -= linhite; /* advance to next */ |
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outspan.ybot -= linhite; |
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spanmin = dxsize; |
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spanmax = 0; |
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|
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} |
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|
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|
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|
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outputspan() /* 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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|
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if (spanmin <= spanmax) { /* overlay spans */ |
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|
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i = nrows*dxsize; |
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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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|
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|
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|
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doprim(p) /* plot primitive */ |
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|
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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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|
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switch (p->com) { |
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|
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case PLSEG: |
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plotlseg(p); |
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break; |
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|
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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],dxsize),CONV(p->xy[YMN],dysize), |
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CONV(p->xy[XMX],dxsize)+(p->arg0&0100?-1:0), |
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CONV(p->xy[YMX],dysize)+(p->arg0&0100?-1:0)); |
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break; |
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|
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case PTFILL: |
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tfill(p); |
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break; |
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|
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case PMSTR: |
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printstr(p); |
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break; |
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|
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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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|
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if (CONV(p->xy[YMN],dysize) < 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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} |
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|
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|
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|
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|
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|
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plotlseg(p) /* plot a line segment */ |
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|
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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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|
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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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|
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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, dxsize); |
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vrad = CONV(ti, dysize); |
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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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|
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x = CONV(p->xy[XMX], dxsize); /* start at top */ |
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y = CONV(p->xy[YMX], dysize); |
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run = CONV(p->xy[XMN], dxsize) - x; |
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rise = CONV(p->xy[YMN], dysize) - y; |
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|
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if (p->arg0 & 0100) /* slope < 0; reverse x */ |
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x -= (run = -run); |
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|
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xstop = x + run; /* compute end point */ |
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ystop = y + rise; |
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|
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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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|
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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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|
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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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|
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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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|
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|
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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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|
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paintline(x, y, run, rise, hrad, vrad, lpat, run2, rise2, n) |
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|
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register int x, y; |
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int run, rise; |
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int hrad, vrad; |
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int lpat; |
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long run2, 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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|
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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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|
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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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} |
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|
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|
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|
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tfill(p) /* fill a triangle */ |
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register PRIMITIVE *p; |
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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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|
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xmn = CONV(p->xy[XMN], dxsize); |
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xsz = CONV(p->xy[XMX], dxsize) - xmn; |
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ymn = CONV(p->xy[YMN], dysize); |
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ysz = CONV(p->xy[YMX], dysize) - 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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|
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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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fill(tpat, txmax + 1, ymn, xmn + (int)xsz - 1, ymn + (int)ysz - 1); |
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} |
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} |
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|
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|
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|
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|
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fill(attrib, xmin, ymin, xmax, ymax) /* fill rectangle with attribute */ |
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|
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int attrib; |
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int xmin, ymin, xmax, ymax; |
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|
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{ |
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int filpat; |
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int rpos; |
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unsigned char *pattr; |
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register char *colp; |
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register int i; |
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|
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xmin = max(xmin, outspan.xleft) - outspan.xleft; |
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ymin = max(ymin, outspan.ybot) - outspan.ybot; |
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xmax = min(xmax, outspan.xright) - outspan.xleft; |
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ymax = min(ymax, outspan.ytop) - outspan.ybot; |
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|
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for (rpos = 0; rpos < nrows; rpos++) |
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|
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if (rpos >= ymin >> 3 && rpos <= ymax >> 3) { |
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|
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filpat = 0377; |
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if (rpos == ymin >> 3) { |
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i = ymin & 07; |
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filpat = (filpat >> i) << i; |
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} |
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if (rpos == ymax >> 3) { |
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i = ~ymax & 07; |
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filpat = ((filpat << i) & 0377) >> i; |
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} |
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|
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pattr = pattern[(attrib&074)>>2] |
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[((outspan.ybot>>3)+rpos)%(PATSIZE>>3)]; |
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|
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if (attrib & 0100) { |
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colp = &outspan.tcols[rpos*dxsize + xmin]; |
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for (i = xmin; i <= xmax; i++) |
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*colp++ ^= filpat & pattr[i%PATSIZE]; |
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} else { |
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colp = &outspan.cols[rpos*dxsize + xmin]; |
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for (i = xmin; i <= xmax; i++) |
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*colp++ |= filpat & pattr[i%PATSIZE]; |
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} |
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|
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spanmin = min(xmin, spanmin); |
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spanmax = max(xmax, spanmax); |
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} |
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|
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} |
