wllib-SVGA.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <unistd.h>
   5 #include <math.h>
   6 #include <vga.h>
   7 #include "wllib.h"
   8
   9 #define SAFE_BORDER (4)
  10 #define SIZE_MIN (16)
  11
  12 #define DEFAULT_MODE G320x200x256
  13
  14 extern void drawgfx(void);
  15
  16 long xmin,xmax,ymin,ymax;
  17 int winx,winy,iniline,minimax=1,xcur,ycur;
  18 float coefx,coefy;
  19
  20 char *pname;
  21
  22 void wl_line(long x,long y)
  23 {
  24         if (iniline) {
  25                 iniline=0;
  26                 if (minimax) { xmin=xmax=x; ymin=ymax=y; }
  27                 else {
  28                         xcur=rint(coefx*(x-xmin))+SAFE_BORDER;
  29                         ycur=winy-SAFE_BORDER-rint(coefy*(y-ymin));
  30                         }
  31                 }
  32         else {
  33                 if (minimax) {
  34                         if (x<xmin) xmin=x; if (x>xmax) xmax=x;
  35                         if (y<ymin) ymin=y; if (y>ymax) ymax=y;
  36                         }
  37                 else {
  38 int xcur2,ycur2;
  39                         vga_drawline(xcur,ycur,
  40                                         xcur2=rint(coefx*(x-xmin))+SAFE_BORDER,ycur2=winy-SAFE_BORDER-rint(coefy*(y-ymin)));
  41                         xcur=xcur2; ycur=ycur2;
  42                         }
  43                 }
  44 }
  45
  46
  47 void wl_done(void)
  48 {
  49         iniline=1; drawgfx();
  50         minimax=0;
  51         if (xmax==xmin) xmax++;
  52         if (ymax==ymin) ymax++;
  53         if (iniline) return;
  54         coefx=(float)(winx-2*SAFE_BORDER-1)/(xmax-xmin);
  55         coefy=(float)(winy-2*SAFE_BORDER-1)/(ymax-ymin);
  56         iniline=1; drawgfx();
  57         vga_getch();
  58 }
  59
  60 static void wl_cleanup(void)
  61 {
  62         vga_setmode(TEXT);
  63 }
  64
  65 void wl_init(int *argcp,char **argv,const char *class)
  66 {
  67 int i,j;
  68 char *s=NULL;
  69 int mode=-1;
  70         if ((pname=rindex(*argv,'/'))) pname++;
  71         else pname=*argv;
  72         for (j=i=1;i<*argcp;i++)
  73                 if (!strcmp(argv[i],"-m")||!strcmp(argv[i],"--mode")) {
  74                         s=argv[++i]; j++;
  75                         }
  76                 else argv[j++]=argv[i];
  77         if (s) mode=vga_getmodenumber(s);
  78         if (mode==-1) if ((mode=vga_getdefaultmode())==-1) mode=DEFAULT_MODE;
  79         if (vga_setmode(mode)==-1) {
  80                 fprintf(stderr,"%s: Mode \"%s\" [%d] not available!\n",pname,
  81                                 vga_getmodename(mode),mode);
  82                 exit(EXIT_FAILURE);
  83                 }
  84         atexit(wl_cleanup);
  85         winx=vga_getxdim(); winy=vga_getydim();
  86         vga_setcolor(vga_white());
  87 }