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#ifndef lint |
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static const char RCSid[] = "$Id: rplot.c,v 1.2 2003/07/21 22:30:18 schorsch Exp $"; |
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#endif |
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/* |
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* Plotting routines for meta-files to raster files |
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*/ |
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|
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|
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#include "meta.h" |
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#include "plot.h" |
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#include "rast.h" |
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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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static void initplot(void); |
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static void doglobal(PRIMITIVE *g); |
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static void plotblock(FILE *infp); |
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static void doprim(PRIMITIVE *p); |
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static void doprim(PRIMITIVE *p); |
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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 tfill(PRIMITIVE *p); |
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static void fill(int attrib, int xmin, int ymin, int xmax, int ymax); |
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|
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|
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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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plotblock(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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void |
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initplot(void) /* initialize this plot */ |
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{ |
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int i; |
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|
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thispage(); |
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/* allocate block */ |
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if (outblock.xright <= 0) { |
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for (i = 0; i < NUMSCANS; i++) |
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if ((outblock.cols[i] = (unsigned char *)malloc(dxsize)) == NULL) |
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error(SYSTEM, "out of memory in initplot"); |
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} |
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outblock.xleft = 0; |
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outblock.xright = dxsize-1; |
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if (ydown) { |
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outblock.ytop = dysize+NUMSCANS-1; |
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outblock.ybot = dysize; |
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} else { |
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outblock.ytop = -1; |
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outblock.ybot = -NUMSCANS; |
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} |
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|
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} |
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|
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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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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 PEOP: |
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if (g->arg0 & 0200) /* advance page */ |
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nextpage(); |
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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 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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void |
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plotblock( /* plot next block */ |
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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 block */ |
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nextblock(); |
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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) && inthis(&nextp)) { |
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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 block */ |
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outputblock(); |
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|
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} |
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|
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|
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|
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extern void |
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nextblock(void) /* prepare next block */ |
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{ |
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register int i, n; |
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register unsigned char *colp; |
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/* clear block */ |
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for (i = 0; i < NUMSCANS; i++) { |
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colp = outblock.cols[i]; |
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n = dxsize; |
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while (n--) |
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*colp++ = IWHT<<3 | IWHT; |
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} |
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/* advance */ |
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if (ydown) { |
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outblock.ytop -= NUMSCANS; |
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outblock.ybot -= NUMSCANS; |
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} else { |
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outblock.ytop += NUMSCANS; |
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outblock.ybot += NUMSCANS; |
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} |
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return; |
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} |
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|
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|
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void |
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outputblock(void) /* output block to printer */ |
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{ |
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register int i, n; |
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register unsigned char *colp; |
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|
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for (i = 0; i < NUMSCANS; i++) { /* overlay blocks */ |
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|
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n = outblock.xright - outblock.xleft + 1; |
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colp = outblock.cols[i] + outblock.xleft; |
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while (n--) { |
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*colp = *colp>>3 & *colp; |
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colp++; |
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} |
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} |
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printblock(); /* print block */ |
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} |
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|
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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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|
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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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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 (innext(p)) { /* 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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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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|
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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 = outblock.ytop+vrad+1-y) < 0) { /* adjust to top of block */ |
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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 = outblock.ybot-vrad-1-ystop) > 0) { /* adjust to bottom of block */ |
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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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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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|
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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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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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|
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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 = (outblock.ybot - ymn)*xsz/ysz; |
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txmax = (outblock.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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void |
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fill( /* fill rectangle with attribute */ |
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register int attrib, |
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int xmin, |
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int ymin, |
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int xmax, |
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int ymax |
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) |
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{ |
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register int i, j; |
| 399 |
|
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xmin = max(xmin, outblock.xleft); |
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ymin = max(ymin, outblock.ybot); |
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xmax = min(xmax, outblock.xright); |
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ymax = min(ymax, outblock.ytop); |
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|
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for (j = ymin; j <= ymax; j++) |
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for (i = xmin; i <= xmax; i++) |
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if (pattern[(attrib&074)>>2] |
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[(j>>3)%(PATSIZE>>3)][i%PATSIZE] & 1<<(j&07)) { |
| 409 |
|
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if (attrib & 0100) { |
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pixtog(i,j,attrib&03); |
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} else { |
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pixmix(i,j,attrib&03); |
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} |
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} |
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|
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} |
