internal void drawCircle(int x, int y, int r, G_Color color)
{
int f = 1 - r;
int ddFx = 1;
int ddFy = -2 * r;
int xi = 0;
int yi = r;

int xs = x + r;
int ys = y + r;
//algoritmus nefunguje pro nektere krajni body tak je dam rucne
putPixel(xs, ys + r, color);
putPixel(xs, ys - r, color);
putPixel(xs + r, ys, color);
putPixel(xs - r, ys, color);

while (xi < yi)
{
  if (f >= 0)
  {
      yi--;
      ddFy += 2;
      f += ddFy;
  }
  xi++;
  ddFx += 2;
  f += ddFx;
  //vykreslit oblouk ?
  putPixel(xs + xi, ys + yi, color);
  putPixel(xs - xi, ys + yi, color);
  putPixel(xs + xi, ys - yi, color);
  putPixel(xs - xi, ys - yi, color);
  putPixel(xs + yi, ys + xi, color);
  putPixel(xs - yi, ys + xi, color);
  putPixel(xs + yi, ys - xi, color);
  putPixel(xs - yi, ys - xi, color);
}
}