void graphicsDrawCircle(JsGraphics *gfx, short posX, short posY, short rad) {
graphicsToDeviceCoordinates(gfx, &posX, &posY);
int radY = 0,
radX = rad;
// Decision criterion divided by 2 evaluated at radX=radX, radY=0
int decisionOver2 = 1 - radX;
while (radX >= radY) {
graphicsSetPixelDevice(gfx, radX + posX, radY + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, radY + posX, radX + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, -radX + posX, radY + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, -radY + posX, radX + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, -radX + posX, -radY + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, -radY + posX, -radX + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, radX + posX, -radY + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, radY + posX, -radX + posY, gfx->data.fgColor);
radY++;
if (decisionOver2 <= 0) {
// Change in decision criterion for radY -> radY+1
decisionOver2 += 2 * radY + 1;
}
else {
radX--;
// Change for radY -> radY+1, radX -> radX-1
decisionOver2 += 2 * (radY - radX) + 1;
}
}
}
static void graphicsFillRectDevice(JsGraphics *gfx, short x1, short y1, short x2, short y2) {
if (x1>x2) {
short t = x1;
x1 = x2;
x2 = t;
}
if (y1>y2) {
short t = y1;
y1 = y2;
y2 = t;
}
if (x1<0) x1=0;
if (y1<0) y1=0;
if (x2>=gfx->data.width) x2 = (short)(gfx->data.width - 1);
if (y2>=gfx->data.height) y2 = (short)(gfx->data.height - 1);
if (x2<x1 || y2<y1) return; // nope
if (x1 < gfx->data.modMinX) gfx->data.modMinX=x1;
if (x2 > gfx->data.modMaxX) gfx->data.modMaxX=x2;
if (y1 < gfx->data.modMinY) gfx->data.modMinY=y1;
if (y2 > gfx->data.modMaxY) gfx->data.modMaxY=y2;
if (x1==x2 && y1==y2) {
graphicsSetPixelDevice(gfx,x1,y1,gfx->data.fgColor);
return;
}
return gfx->fillRect(gfx, x1, y1, x2, y2);
}
void graphicsFallbackFillRect(JsGraphics *gfx, short x1, short y1, short x2, short y2) {
short x,y;
for (y=y1;y<=y2;y++)
for (x=x1;x<=x2;x++)
graphicsSetPixelDevice(gfx,x,y, gfx->data.fgColor);
}
void graphicsSetPixel(JsGraphics *gfx, short x, short y, unsigned int col) {
graphicsToDeviceCoordinates(gfx, &x, &y);
graphicsSetPixelDevice(gfx, x, y, col);
}
