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greg |
1.1 |
#ifndef lint |
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schorsch |
1.3 |
static const char RCSid[] = "$Id: mplot.c,v 1.2 2003/07/01 21:21:40 greg Exp $"; |
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greg |
1.1 |
#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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schorsch |
1.3 |
#include <stdio.h> |
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#include <string.h> |
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greg |
1.1 |
#include <fcntl.h> |
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schorsch |
1.3 |
#include "platform.h" |
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greg |
1.1 |
#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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schorsch |
1.3 |
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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greg |
1.1 |
{ |
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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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schorsch |
1.3 |
void |
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initplot(void) /* initialize this plot */ |
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greg |
1.1 |
{ |
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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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schorsch |
1.3 |
void |
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doglobal( /* execute a global command */ |
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PRIMITIVE *g |
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) |
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greg |
1.1 |
{ |
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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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greg |
1.2 |
case PPAUS: |
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greg |
1.1 |
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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schorsch |
1.3 |
void |
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plotspan( /* plot next span */ |
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FILE *infp |
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) |
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greg |
1.1 |
{ |
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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; |
| 144 |
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lastinq.pbot = inqueue.pbot; |
| 145 |
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inqueue.ptop = inqueue.pbot = NULL; |
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while ((p = pop(&lastinq)) != NULL) { |
| 147 |
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doprim(p); |
| 148 |
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pfree(p); |
| 149 |
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} |
| 150 |
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/* plot from file */ |
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while (isprim(nextp.com) && CONV(nextp.xy[YMX],dysize) >= outspan.ybot) { |
| 152 |
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doprim(&nextp); |
| 153 |
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fargs(&nextp); |
| 154 |
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readp(&nextp, infp); |
| 155 |
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} |
| 156 |
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/* print out span */ |
| 157 |
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outputspan(); |
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| 159 |
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} |
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schorsch |
1.3 |
void |
| 163 |
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nextspan(void) /* prepare next span */ |
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greg |
1.1 |
{ |
| 165 |
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register int i; |
| 166 |
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register char *colp, *tcolp; |
| 167 |
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| 168 |
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if (spanmin <= spanmax) { /* clear span */ |
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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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outspan.ytop -= linhite; /* advance to next */ |
| 178 |
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outspan.ybot -= linhite; |
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spanmin = dxsize; |
| 180 |
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spanmax = 0; |
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| 182 |
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} |
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| 184 |
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schorsch |
1.3 |
void |
| 186 |
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outputspan(void) /* output span to printer */ |
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greg |
1.1 |
{ |
| 188 |
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register int i; |
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register char *colp, *tcolp; |
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| 191 |
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if (spanmin <= spanmax) { /* overlay spans */ |
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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 */ |
| 200 |
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} |
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schorsch |
1.3 |
void |
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doprim( /* plot primitive */ |
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register PRIMITIVE *p |
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) |
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greg |
1.1 |
{ |
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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],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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| 223 |
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case PTFILL: |
| 224 |
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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: |
| 232 |
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sprintf(errmsg, "unknown command '%c' in doprim", p->com); |
| 233 |
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error(WARNING, errmsg); |
| 234 |
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return; |
| 235 |
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} |
| 236 |
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| 237 |
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if (CONV(p->xy[YMN],dysize) < outspan.ybot) { /* save for next time */ |
| 238 |
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if ((newp = palloc()) == NULL) |
| 239 |
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error(SYSTEM, "memory limit exceeded in doprim"); |
| 240 |
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mcopy((char *)newp, (char *)p, sizeof(PRIMITIVE)); |
| 241 |
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newp->args = savestr(p->args); |
| 242 |
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add(newp, &inqueue); |
| 243 |
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} |
| 244 |
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| 245 |
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} |
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| 248 |
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schorsch |
1.3 |
void |
| 250 |
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plotlseg( /* plot a line segment */ |
| 251 |
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register PRIMITIVE *p |
| 252 |
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) |
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greg |
1.1 |
{ |
| 254 |
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register int ti; |
| 255 |
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long run2 = 0L, rise2 = 0L; |
| 256 |
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int x, y, run, rise, xstop, ystop, hrad, vrad, lpat, n; |
| 257 |
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| 258 |
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/* compute line pattern */ |
| 259 |
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lpat = (p->arg0 >> 2) & 014; |
| 260 |
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if (p->arg0 & 0100 && lpat != 0) |
| 261 |
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lpat += 014; |
| 262 |
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lpat |= p->arg0 & 03; |
| 263 |
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| 264 |
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ti = (p->arg0 >> 2) & 03; /* compute line radius */ |
| 265 |
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ti = WIDTH(ti) / 2; |
| 266 |
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hrad = CONV(ti, dxsize); |
| 267 |
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vrad = CONV(ti, dysize); |
| 268 |
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if (hrad < minwidth) |
| 269 |
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hrad = minwidth; |
| 270 |
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if (vrad < minwidth) |
| 271 |
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vrad = minwidth; |
| 272 |
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| 273 |
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x = CONV(p->xy[XMX], dxsize); /* start at top */ |
| 274 |
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y = CONV(p->xy[YMX], dysize); |
| 275 |
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run = CONV(p->xy[XMN], dxsize) - x; |
| 276 |
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rise = CONV(p->xy[YMN], dysize) - y; |
| 277 |
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| 278 |
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if (p->arg0 & 0100) /* slope < 0; reverse x */ |
| 279 |
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x -= (run = -run); |
| 280 |
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| 281 |
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xstop = x + run; /* compute end point */ |
| 282 |
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ystop = y + rise; |
| 283 |
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| 284 |
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if ((ti = outspan.ytop+vrad+1-y) < 0) { /* adjust to top of span */ |
| 285 |
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run2 = rise2 = (long)ti*run; |
| 286 |
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x += rise2/rise; |
| 287 |
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y += ti; |
| 288 |
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} |
| 289 |
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| 290 |
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if ((ti = outspan.ybot-vrad-1-ystop) > 0) { /* adjust to bottom of span */ |
| 291 |
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xstop += (long)ti*run/rise; |
| 292 |
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ystop += ti; |
| 293 |
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} |
| 294 |
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| 295 |
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if (abs(run) > -rise) |
| 296 |
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n = abs(xstop - x); |
| 297 |
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else |
| 298 |
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n = y - ystop; |
| 299 |
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| 300 |
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paintline(x, y, run, rise, hrad, vrad, lpat, run2, rise2, n); |
| 301 |
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| 302 |
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} |
| 303 |
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| 304 |
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| 305 |
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| 306 |
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/* |
| 307 |
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* This routine paints a line with calls to fill(). The line can |
| 308 |
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* start and end at arbitrary points on a longer line segment. |
| 309 |
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*/ |
| 310 |
schorsch |
1.3 |
void |
| 311 |
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paintline( |
| 312 |
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register int x, |
| 313 |
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register int y, |
| 314 |
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int run, |
| 315 |
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int rise, |
| 316 |
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int hrad, |
| 317 |
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int vrad, |
| 318 |
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int lpat, |
| 319 |
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long run2, |
| 320 |
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long rise2, |
| 321 |
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int n |
| 322 |
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) |
| 323 |
greg |
1.1 |
{ |
| 324 |
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int xstep, ystep; |
| 325 |
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| 326 |
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if (run >= 0) |
| 327 |
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xstep = 1; |
| 328 |
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else { |
| 329 |
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xstep = -1; |
| 330 |
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run = -run; |
| 331 |
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} |
| 332 |
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if (rise >= 0) |
| 333 |
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ystep = 1; |
| 334 |
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else { |
| 335 |
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ystep = -1; |
| 336 |
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rise = -rise; |
| 337 |
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} |
| 338 |
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if (n < 0) |
| 339 |
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n = max(run, rise); |
| 340 |
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| 341 |
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if (run > rise) |
| 342 |
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while (n >= 0) |
| 343 |
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if (run2 >= rise2) { |
| 344 |
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fill(lpat, x-hrad, y-vrad, x+hrad, y+vrad); |
| 345 |
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n--; |
| 346 |
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x += xstep; |
| 347 |
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rise2 += rise; |
| 348 |
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} else { |
| 349 |
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y += ystep; |
| 350 |
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run2 += run; |
| 351 |
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} |
| 352 |
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else |
| 353 |
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while (n >= 0) |
| 354 |
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if (rise2 >= run2) { |
| 355 |
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fill(lpat, x-hrad, y-vrad, x+hrad, y+vrad); |
| 356 |
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n--; |
| 357 |
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y += ystep; |
| 358 |
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run2 += run; |
| 359 |
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} else { |
| 360 |
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x += xstep; |
| 361 |
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rise2 += rise; |
| 362 |
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} |
| 363 |
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| 364 |
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} |
| 365 |
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| 366 |
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| 367 |
schorsch |
1.3 |
void |
| 368 |
|
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tfill( /* fill a triangle */ |
| 369 |
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register PRIMITIVE *p |
| 370 |
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) |
| 371 |
greg |
1.1 |
{ |
| 372 |
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register int x, txmin, txmax; |
| 373 |
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int xmn, ymn, tpat; |
| 374 |
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long xsz, ysz; |
| 375 |
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| 376 |
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xmn = CONV(p->xy[XMN], dxsize); |
| 377 |
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xsz = CONV(p->xy[XMX], dxsize) - xmn; |
| 378 |
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ymn = CONV(p->xy[YMN], dysize); |
| 379 |
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ysz = CONV(p->xy[YMX], dysize) - ymn; |
| 380 |
|
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if (xsz <= 0 || ysz <= 0) |
| 381 |
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return; |
| 382 |
|
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txmin = (outspan.ybot - ymn)*xsz/ysz; |
| 383 |
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txmax = (outspan.ytop - ymn)*xsz/ysz; |
| 384 |
|
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if (p->arg0 & 020) { /* up or down */ |
| 385 |
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x = txmin; |
| 386 |
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txmin = xsz - txmax; |
| 387 |
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txmax = xsz - x; |
| 388 |
|
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} |
| 389 |
|
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txmin += xmn; |
| 390 |
|
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txmax += xmn; |
| 391 |
|
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txmin = max(txmin, xmn); |
| 392 |
|
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txmax = min(txmax, xmn + (int)xsz - 1); |
| 393 |
|
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tpat = (p->arg0&0103) | (pati[(p->arg0>>2)&03]<<2); |
| 394 |
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| 395 |
|
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if (p->arg0 & 040) { /* left or down */ |
| 396 |
|
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fill(tpat, xmn, ymn, txmin - 1, ymn + (int)ysz - 1); |
| 397 |
|
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for (x = txmin; x <= txmax; x++) |
| 398 |
|
|
if (p->arg0 & 020) /* down */ |
| 399 |
|
|
fill(tpat, x, ymn, x, (int)(ysz-(x-xmn)*ysz/xsz) + ymn - 1); |
| 400 |
|
|
else /* left */ |
| 401 |
|
|
fill(tpat, x, (int)((x-xmn)*ysz/xsz) + ymn, x, ymn + (int)ysz - 1); |
| 402 |
|
|
} else { /* right or up */ |
| 403 |
|
|
for (x = txmin; x <= txmax; x++) |
| 404 |
|
|
if (p->arg0 & 020) /* up */ |
| 405 |
|
|
fill(tpat, x, (int)(ysz-(x-xmn)*ysz/xsz) + ymn, x, ymn + (int)ysz - 1); |
| 406 |
|
|
else /* right */ |
| 407 |
|
|
fill(tpat, x, ymn, x, (int)((x-xmn)*ysz/xsz) + ymn - 1); |
| 408 |
|
|
fill(tpat, txmax + 1, ymn, xmn + (int)xsz - 1, ymn + (int)ysz - 1); |
| 409 |
|
|
} |
| 410 |
|
|
} |
| 411 |
|
|
|
| 412 |
|
|
|
| 413 |
|
|
|
| 414 |
schorsch |
1.3 |
void |
| 415 |
|
|
fill( /* fill rectangle with attribute */ |
| 416 |
|
|
int attrib, |
| 417 |
|
|
int xmin, |
| 418 |
|
|
int ymin, |
| 419 |
|
|
int xmax, |
| 420 |
|
|
int ymax |
| 421 |
|
|
) |
| 422 |
greg |
1.1 |
{ |
| 423 |
|
|
int filpat; |
| 424 |
|
|
int rpos; |
| 425 |
|
|
unsigned char *pattr; |
| 426 |
|
|
register char *colp; |
| 427 |
|
|
register int i; |
| 428 |
|
|
|
| 429 |
|
|
xmin = max(xmin, outspan.xleft) - outspan.xleft; |
| 430 |
|
|
ymin = max(ymin, outspan.ybot) - outspan.ybot; |
| 431 |
|
|
xmax = min(xmax, outspan.xright) - outspan.xleft; |
| 432 |
|
|
ymax = min(ymax, outspan.ytop) - outspan.ybot; |
| 433 |
|
|
|
| 434 |
|
|
for (rpos = 0; rpos < nrows; rpos++) |
| 435 |
|
|
|
| 436 |
|
|
if (rpos >= ymin >> 3 && rpos <= ymax >> 3) { |
| 437 |
|
|
|
| 438 |
|
|
filpat = 0377; |
| 439 |
|
|
if (rpos == ymin >> 3) { |
| 440 |
|
|
i = ymin & 07; |
| 441 |
|
|
filpat = (filpat >> i) << i; |
| 442 |
|
|
} |
| 443 |
|
|
if (rpos == ymax >> 3) { |
| 444 |
|
|
i = ~ymax & 07; |
| 445 |
|
|
filpat = ((filpat << i) & 0377) >> i; |
| 446 |
|
|
} |
| 447 |
|
|
|
| 448 |
|
|
pattr = pattern[(attrib&074)>>2] |
| 449 |
|
|
[((outspan.ybot>>3)+rpos)%(PATSIZE>>3)]; |
| 450 |
|
|
|
| 451 |
|
|
if (attrib & 0100) { |
| 452 |
|
|
colp = &outspan.tcols[rpos*dxsize + xmin]; |
| 453 |
|
|
for (i = xmin; i <= xmax; i++) |
| 454 |
|
|
*colp++ ^= filpat & pattr[i%PATSIZE]; |
| 455 |
|
|
} else { |
| 456 |
|
|
colp = &outspan.cols[rpos*dxsize + 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 |
|
|
} |
