DG>   Anyone know how to put a pixel in EGA (mode 10h) video?
dg>.....
/*_|_|   HAPYTRLZ.C   PUBLIC DOMAIN   By Kurt Kuzba.  (4/20/97)
_|_|_|   EGA screen functions in C, with some ASM.    ( 2 of 2)
_|_|*/
/* draws a line from (x, y) to (x2, y2) in color c */
void bresenham_line(int x, int y, int x2, int y2, int c)
{
   int i, steep = 0, sx, sy, dx, dy, e, ex, ey;
   dx = ((x2 - x) > 0) ? x2 - x : -(x2 - x);
   sx = ((x2 - x) > 0) ?      1 :        -1;
   dy = ((y2 - y) > 0) ? y2 - y : -(y2 - y);
   sy = ((y2 - y) > 0) ?      1 :        -1;
   if(dy > dx)
   {
      steep =  x;  x =  y;  y = steep;  /* swap  x and  y */
      steep = dx; dx = dy; dy = steep;  /* swap dx and dy */
      steep = sx; sx = sy; sy = steep;  /* swap sx and sy */
      steep = 1;
   }
   ex = dx << 1;   ey = dy << 1;   e = ey - dx;
   for(i = 0; i < dx; i++)
   {
      if(steep)   putpixel(y, x, c);   else  putpixel(x, y, c);
      while(e >= 0)   { y += sy;e -= ex; }   x += sx;   e += ey;
   }
   putpixel(x2, y2, c);
}
void test(void)
{
   LineEnd xy[20] =
      { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0,
        0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
   int loop, c, xd[2], yd[2], change, hi = SCREEN_HEIGHT - 2;
   xd[0] = rnd(2, 4); xd[1] = rnd(2, 4);
   yd[0] = rnd(2, 4); xd[1] = rnd(2, 4);
   change = c = 0;
   while(*((char far*)0x0041000aL) == *((char far*)0x0041000cL))
   {
       if((change = ((change + 1) & 255)) == 0)    c = rnd(0, 15);
       for(loop = 0; loop < 2; loop++)
       {
          xy[loop + 18] = xy[loop + 16];
          xy[loop + 16] = xy[loop + 14];
          xy[loop + 14] = xy[loop + 12];
          xy[loop + 12] = xy[loop + 10];
          xy[loop + 10] = xy[loop + 8];
          xy[loop + 8] = xy[loop + 6];
          xy[loop + 6] = xy[loop + 4];
          xy[loop + 4] = xy[loop + 2];
          xy[loop + 2] = xy[loop];
          if(xy[loop].x < 1   )  xd[loop] =  rnd(3, 7);
          if(xy[loop].x > hi  )  xd[loop] = -rnd(3, 7);
          if(xy[loop].y < 1   )  yd[loop] =  rnd(3, 7);
          if(xy[loop].y > 638 )  yd[loop] = -rnd(3, 7);
          xy[loop].x += xd[loop];
          xy[loop].y += yd[loop];
       }
       bresenham_line(xy[18].y, xy[18].x, xy[19].y, xy[19].x, c);
       bresenham_line(xy[16].y, xy[16].x, xy[17].y, xy[17].x, 1);
       bresenham_line(xy[14].y, xy[14].x, xy[15].y, xy[15].x, 1);
       bresenham_line(xy[12].y, xy[12].x, xy[13].y, xy[13].x, 9);
       bresenham_line(xy[10].y, xy[10].x, xy[11].y, xy[11].x, 9);
       bresenham_line(xy[8].y,  xy[8].x,  xy[9].y,  xy[9].x,  3);
       bresenham_line(xy[6].y,  xy[6].x,  xy[7].y,  xy[7].x,  3);
       bresenham_line(xy[4].y,  xy[4].x,  xy[5].y,  xy[5].x,  11);
       bresenham_line(xy[2].y,  xy[2].x,  xy[3].y,  xy[3].x,  11);
       bresenham_line(xy[0].y,  xy[0].x,  xy[1].y,  xy[1].x,  15);
   }
}
int main(void)
{
   vidmode(0x10);
   srand((unsigned)time(NULL));
   test();
   getch();
   vidmode(0x03);
   return 0;
}
/*_|_|   end   HAPYTRLZ.C   PUBLIC DOMAIN   ( 2 of 2 )*/
> ] Love is not blind, but sometimes it looks the other way.....
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