VGLLine
VGLLine(object, x1, y1, x2, y1, color);
VGLLine(object, x2, y1, x2, y2, color);
VGLLine(object, x2, y2, x1, y2, color);
VGLLine(object, x1, y2, x1, y1, color);
for (y=y1; y<=y2; y++) VGLLine(object, x1, y, x2, y, color);
VGLLine(object, xc+x, yc+y, xc-x, yc+y, color);
VGLLine(object, xc+x, yc-y, xc-x, yc-y, color);
VGLLine(object, xc, yc+y, xc, yc-y, color);
void VGLLine(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color);
VGLLine(VGLDisplay, rand()%xsize, rand()%ysize,
VGLLine(VGLDisplay, 0, y, xsize-1, y, y/2 % 256);
VGLLine(VGLDisplay, 0, 0, xsize-1, ysize-1, 63);
VGLLine(VGLDisplay, 0, ysize-1, xsize-1, 0, 63);
VGLLine(VGLDisplay, 0, 0, 0, ysize-1, 63);
VGLLine(VGLDisplay, xsize-1, 0, xsize-1, ysize-1, 63);