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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* text.c - functions for text patterns and mixtures. |
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* |
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* 11/12/86 |
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*/ |
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|
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#include "ray.h" |
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|
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#include "otypes.h" |
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|
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/* |
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* A text pattern is specified as the text (a file or line), |
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* the upper left anchor point, the right motion vector, the down |
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* motion vector, and the foreground and background brightness. |
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* For a file, the description is as follows: |
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* |
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* modifier brighttext id |
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* 2 fontfile textfile |
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* 0 |
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* 11 |
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* Ax Ay Az |
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* Rx Ry Rz |
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* Dx Dy Dz |
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* foreground background |
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* |
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* For a single line, we use: |
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* |
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* modifier brighttext id |
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* N+2 fontfile . This is a line with N words... |
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* 0 |
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* 11 |
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* Ax Ay Az |
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* Rx Ry Rz |
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* Dx Dy Dz |
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* foreground background |
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* |
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* Colortext is identical, except colors are given rather than |
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* brightnesses. Mixtext has foreground and background modifiers: |
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* |
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* modifier mixtext id |
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* 4+ foremod backmod fontfile text.. |
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* 0 |
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* 9 |
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* Ax Ay Az |
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* Rx Ry Rz |
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* Dx Dy Dz |
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*/ |
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|
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#define fndx(m) ((m)->otype==MIX_TEXT ? 2 : 0) |
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#define tndx(m) ((m)->otype==MIX_TEXT ? 3 : 1) |
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|
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extern char *libpath; /* library search path */ |
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|
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typedef unsigned char GLYPH; |
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|
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typedef struct font { |
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GLYPH *fg[256]; /* font glyphs */ |
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char *name; /* font file name */ |
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struct font *next; /* next font in list */ |
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} FONT; |
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|
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extern GLYPH *getglyph(); |
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|
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extern FONT *getfont(); |
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|
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static FONT *fontlist = NULL; /* our font list */ |
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|
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|
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text(m, r) |
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register OBJREC *m; |
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RAY *r; |
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{ |
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double v[3], y, x; |
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int col, lno; |
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int foreground; |
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GLYPH *g; |
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register double *ap; |
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|
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if (m->oargs.nsargs - tndx(m) < 1 || |
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m->oargs.nfargs != (m->otype == PAT_BTEXT ? 11 : |
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m->otype == PAT_CTEXT ? 15 : 9)) |
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objerror(m, USER, "bad # arguments"); |
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|
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/* first, discover position in text */ |
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ap = m->oargs.farg; |
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multp3(v, r->rop, r->robx); |
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v[0] -= ap[0]; |
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v[1] -= ap[1]; |
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v[2] -= ap[2]; |
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col = x = DOT(v, ap+3) / DOT(ap+3, ap+3); |
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lno = y = DOT(v, ap+6) / DOT(ap+6, ap+6); |
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x -= col; |
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y = (lno+1) - y; |
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/* get the font character, check it */ |
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if ((g = getglyph(m, lno, col)) == NULL) |
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foreground = 0; |
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else |
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foreground = inglyph(x, y, g); |
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/* modify */ |
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if (m->otype == MIX_TEXT) { |
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OBJECT omod; |
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char *modname = m->oargs.sarg[foreground ? 0 : 1]; |
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if (!strcmp(modname, VOIDID)) |
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omod = OVOID; |
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else if ((omod = modifier(modname)) == OVOID) { |
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sprintf(errmsg, "undefined modifier \"%s\"", modname); |
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objerror(m, USER, errmsg); |
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} |
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raymixture(r, omod, OVOID, 1.0); |
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} else if (m->otype == PAT_BTEXT) { |
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if (foreground) |
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scalecolor(r->pcol, ap[9]); |
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else |
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scalecolor(r->pcol, ap[10]); |
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} else { /* PAT_CTEXT */ |
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COLOR cval; |
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if (foreground) |
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setcolor(cval, ap[9], ap[10], ap[11]); |
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else |
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setcolor(cval, ap[12], ap[13], ap[14]); |
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multcolor(r->pcol, cval); |
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} |
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} |
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|
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|
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GLYPH * |
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getglyph(tm, lno, col) /* get a glyph from a text description */ |
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register OBJREC *tm; |
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int lno; |
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int col; |
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{ |
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extern char *strcpy(), *fgets(); |
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FILE *fp; |
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char linbuf[512]; |
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register int i; |
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register char **txt; |
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register char *s; |
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|
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if (lno < 0 || col < 0) |
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return(NULL); |
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if (tm->os == NULL) { |
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txt = (char **)malloc(2*sizeof(char **)); |
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if (txt == NULL) |
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goto memerr; |
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if (tm->oargs.nsargs - tndx(tm) > 1) { /* single line */ |
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s = linbuf; |
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for (i = tndx(tm)+1; i < tm->oargs.nsargs; i++) { |
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strcpy(s, tm->oargs.sarg[i]); |
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s += strlen(s); |
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*s++ = ' '; |
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} |
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*--s = '\0'; |
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txt[0] = savqstr(linbuf); |
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txt[1] = NULL; |
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} else { /* text file */ |
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if ((s = getpath(tm->oargs.sarg[tndx(tm)], |
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libpath)) == NULL) { |
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sprintf(errmsg, "cannot find text file \"%s\"", |
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tm->oargs.sarg[tndx(tm)]); |
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error(USER, errmsg); |
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} |
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if ((fp = fopen(s, "r")) == NULL) { |
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sprintf(errmsg, "cannot open text file \"%s\"", |
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s); |
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error(SYSTEM, errmsg); |
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} |
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for (i=0; fgets(linbuf,sizeof(linbuf),fp)!=NULL; i++) { |
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s = linbuf + strlen(linbuf) - 1; |
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if (*s == '\n') |
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*s = '\0'; |
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txt=(char **)realloc(txt,(i+2)*sizeof(char **)); |
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if (txt == NULL) |
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goto memerr; |
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txt[i] = savqstr(linbuf); |
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} |
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txt[i] = NULL; |
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fclose(fp); |
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} |
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tm->os = (char *)txt; |
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} |
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txt = (char **)tm->os; |
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for (i = 0; i < lno; i++) |
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if (txt[i] == NULL) |
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break; |
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if ((s = txt[i]) == NULL || col >= strlen(s)) |
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return(NULL); |
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else |
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return(getfont(tm->oargs.sarg[fndx(tm)])->fg[s[col]]); |
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memerr: |
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error(SYSTEM, "out of memory in getglyph"); |
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} |
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|
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|
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FONT * |
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getfont(fname) /* return font fname */ |
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char *fname; |
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{ |
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FILE *fp; |
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char *pathname, *err; |
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int gn, ngv, gv; |
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register GLYPH *g; |
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register FONT *f; |
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|
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for (f = fontlist; f != NULL; f = f->next) |
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if (!strcmp(f->name, fname)) |
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return(f); |
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/* load the font file */ |
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if ((pathname = getpath(fname, libpath)) == NULL) { |
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sprintf(errmsg, "cannot find font file \"%s\"", fname); |
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error(USER, errmsg); |
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} |
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f = (FONT *)calloc(1, sizeof(FONT)); |
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if (f == NULL) |
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goto memerr; |
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f->name = savestr(fname); |
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if ((fp = fopen(pathname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open font file \"%s\"", |
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pathname); |
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error(SYSTEM, errmsg); |
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} |
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while (fscanf(fp, "%d", &gn) == 1) { /* get each glyph */ |
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if (gn < 0 || gn > 255) { |
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err = "illegal"; |
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goto fonterr; |
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} |
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if (f->fg[gn] != NULL) { |
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err = "duplicate"; |
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goto fonterr; |
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} |
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if (fscanf(fp, "%d", &ngv) != 1 || |
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ngv < 0 || ngv > 255) { |
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err = "bad # vertices for"; |
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goto fonterr; |
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} |
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g = (GLYPH *)malloc((2*ngv+1)*sizeof(GLYPH)); |
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if (g == NULL) |
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goto memerr; |
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f->fg[gn] = g; |
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*g++ = ngv; |
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ngv *= 2; |
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while (ngv--) { |
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if (fscanf(fp, "%d", &gv) != 1 || |
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gv < 0 || gv > 255) { |
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err = "bad vertex for"; |
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goto fonterr; |
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} |
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*g++ = gv; |
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} |
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} |
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fclose(fp); |
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f->next = fontlist; |
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return(fontlist = f); |
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fonterr: |
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sprintf(errmsg, "%s character (%d) in font file \"%s\"", |
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err, gn, pathname); |
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error(USER, errmsg); |
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memerr: |
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error(SYSTEM, "out of memory in fontglyph"); |
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} |
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|
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|
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inglyph(x, y, gl) /* (x,y) within font glyph gl? */ |
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double x, y; |
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GLYPH *gl; |
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{ |
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int n, ncross; |
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int xlb, ylb; |
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register GLYPH *p0, *p1; |
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|
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if (x < 0.0 || y < 0.0) |
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return(0); |
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xlb = x *= 255.0; /* get glyph coordinates */ |
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ylb = y *= 255.0; |
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n = *gl++; /* get # of vertices */ |
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p0 = gl + 2*(n-1); /* connect last to first */ |
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p1 = gl; |
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ncross = 0; |
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/* positive x axis cross test */ |
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while (n--) { |
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if ((p0[1] > ylb) ^ (p1[1] > ylb)) |
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if (p0[0] > xlb && p1[0] > xlb) |
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ncross++; |
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else if (p0[0] > xlb || p1[0] > xlb) |
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ncross += (p1[1] > p0[1]) ^ |
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((p0[1]-y)*(p1[0]-x) > |
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(p0[0]-x)*(p1[1]-y)); |
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p0 = p1; |
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p1 += 2; |
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} |
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return(ncross & 01); |
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} |
