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  1. /*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis
  2.  *
  3.  *  This program is free software; you can redistribute it and/or modify
  4.  *  it under the terms of the GNU General Public License as published by
  5.  *  the Free Software Foundation; either version 2 of the License, or
  6.  *  (at your option) any later version.
  7.  *
  8.  *  This program is distributed in the hope that it will be useful,
  9.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11.  *  GNU General Public License for more details.
  12.  *
  13.  *  You should have received a copy of the GNU General Public License
  14.  *  along with this program; if not, write to the Free Software
  15.  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16.  */
  17.  /* line input / output / translation routines
  18.   * and error routines */
  19. #include "flydraw.h"
  20.  
  21. void error(char *p)
  22. {
  23.     fprintf(stderr,"%s %d\n",p,linecnt);
  24. }
  25.  
  26. /* Get a line in a stored working file.
  27.  * Buffer length is always MAX_LINELEN. */
  28.  
  29. int ggetline(char buf[])
  30. {
  31.     int c;
  32.     int i;
  33.     for(i=0,c=getchar();i<MAX_LINELEN;i++,c=getchar()) {
  34.       if(c=='\n' || c==EOF || c==';') break;
  35.       buf[i]=c;
  36.     }
  37.     buf[i]=0;
  38.     if(linecnt!=-100000) linecnt++;
  39.     return c;
  40. }
  41.  
  42. double getvar(char *p)
  43. {
  44.     int i;
  45.     for(i=0;i<varcnt && strcmp(p,vartab[i].name)!=0;i++);
  46.     if(i<varcnt) return vartab[i].value;
  47.     else return 0;
  48. }
  49.  
  50. void setvar(char *p, double v)
  51. {
  52.     int i;
  53.     if((strlen(p)>2 && strcmp(p,"animstep")!=0) || !isalpha(*p)) return;
  54.     for(i=0;i<varcnt && strcmp(p,vartab[i].name)!=0;i++);
  55.     if(i<varcnt) {vartab[i].value=v; return;}
  56.     else {
  57.       if(varcnt>=MAX_VARS || varnameptr>=varnamebuf+sizeof(varnamebuf)-1) return;
  58.       ovlstrcpy(varnameptr,p);
  59.       vartab[varcnt].name=varnameptr; vartab[varcnt].value=v;
  60.       varnameptr+=strlen(varnameptr)+1; (varcnt)++;
  61.     }
  62. }
  63.  
  64. /* Points to the end of a name */
  65. char *find_name_end(char *p)
  66. {
  67.     int i;
  68.     for(i=0;isalnum(*p) && i<MAX_LINELEN; p++,i++);
  69.     return p;
  70. }
  71.  
  72. /* Find the beginning of a name */
  73. char *find_name_start(char *p)
  74. {
  75.     int i;
  76.     for(i=0; !isalpha(*p) && i<MAX_LINELEN; p++,i++);
  77.     return p;
  78. }
  79.  
  80. void collapse_item(char *p, int n)
  81. {
  82.     int i;
  83.     char *pp;
  84.     if(n<1) return;
  85.     for(i=1,pp=strchr(p,','); i<n && pp!=NULL; i++,pp=strchr(pp+1,','));
  86.     if(pp==NULL) *p=0;
  87.     else ovlstrcpy(p,pp+1);
  88. }
  89.  
  90. int getcolor(int r, int g, int b)
  91. {
  92.     int col;
  93.     if(r>255) r=255; if(r<0) r=0;
  94.     if(g>255) g=255; if(g<0) g=0;
  95.     if(b>255) b=255; if(b<0) b=0;
  96.     col=gdImageColorExact(image, r, g, b);
  97.     if(col==-1) col=gdImageColorAllocate(image,r,g,b);
  98.     return col;
  99. }
  100.  
  101. int widthcolor(int w, int color)
  102. {
  103.     int bg,fg,sh,e;
  104.     /* already allocated */
  105.     if(wimg!=NULL && savew==w && wcolor==color) goto end;
  106.     if(wimg!=NULL) gdImageDestroy(wimg);
  107.     wimg=gdImageCreate(w,w);
  108.     if(wimg==NULL) {
  109.       error("width_creation_failure"); return color;
  110.     }
  111.     bg=gdImageColorAllocate(wimg,255,255,255);
  112.     gdImageColorTransparent(wimg,bg);
  113.     fg=gdImageColorAllocate(wimg,gdImageRed(image,color),
  114.                       gdImageGreen(image,color),
  115.                       gdImageBlue(image,color));
  116.     e=w-1;sh=e/3;
  117.     switch(w) {
  118.       case 2: {
  119.           gdImageFill(wimg,0,0,fg); break;
  120.       }
  121.       case 3: {
  122.           gdImageFill(wimg,0,0,fg);
  123.           gdImageSetPixel(wimg,2,0,bg);gdImageSetPixel(wimg,2,2,bg);
  124.           break;
  125.       }
  126.       case 4:
  127.       case 5:
  128.       case 6:
  129.       case 7:
  130.       case 8:
  131.       case 9:
  132.       case 10:
  133.       case 11:
  134.       case 12: {
  135.           int pl[]={0,sh, sh,0, e-sh,0, e,sh,
  136.               e,e-sh, e-sh,e, sh,e, 0,e-sh};
  137.           gdImageFilledPolygon(wimg,(gdPointPtr) pl,8,fg);
  138.           break;
  139.       }
  140.       default: {
  141.           gdImageArc(wimg,w/2,w/2,w,w,0,360,fg);
  142.           gdImageFillToBorder(wimg,w/2,w/2,fg,fg);
  143.           break;
  144.       }
  145.     }
  146.     savew=w; wcolor=color;
  147.     end: gdImageSetBrush(image,wimg); return gdBrushed;
  148. }
  149.  
  150. /* scale coordinates, x then y */
  151. void scale(double dbuf[], int ibuf[], int cnt)
  152. {
  153.     int i; double x,y;
  154.     for(i=0;i<cnt*2 && i<MAX_PARMS;i+=2) {
  155.       if(transform) {
  156.           x=dbuf[i]*matrix[0]+dbuf[i+1]*matrix[1];
  157.           y=dbuf[i]*matrix[2]+dbuf[i+1]*matrix[3];
  158.       }
  159.       else {x=dbuf[i]; y=dbuf[i+1];}
  160.       scale_buf[i]=x+transx; scale_buf[i+1]=y+transy;
  161.       ibuf[i]=rint((x-xstart+transx)*xscale);
  162.       ibuf[i+1]=rint((y-ystart+transy)*yscale);
  163.       if(ibuf[i]<-BOUND) ibuf[i]=-BOUND;if(ibuf[i]>BOUND) ibuf[i]=BOUND;
  164.       if(ibuf[i+1]<-BOUND) ibuf[i+1]=-BOUND;if(ibuf[i+1]>BOUND) ibuf[i+1]=BOUND;
  165.     }
  166. }
  167.  
  168. /* scale without displacement */
  169. void scale2(double xin, double yin, double *xout, double *yout)
  170. {
  171.     if(transform) {
  172.       *xout=xin*matrix[0]+yin*matrix[1];
  173.       *yout=xin*matrix[2]+yin*matrix[3];
  174.     }
  175.     else {
  176.       *xout=xin; *yout=yin;
  177.     }
  178.     *xout*=xscale; *yout*=yscale;
  179. }
  180.  
  181.