code: public static Sprite circle(int diameter, int color, int lineWidth) {
  
  		int[] pix = new int[diameter * diameter];
  
  		for (int i = 0; i < lineWidth; i++) {
  			drawCircle(pix, diameter - i, diameter, color);
  		}
  
  		return new Sprite(diameter, diameter, pix);
  	}
docs: Creates a new Sprite with a cicle drawn onto it
  
  @param diameter  The diameter of the circle (will be the width and height of the sprite)
  @param color     The color of the circle (in ARGB format: 0xAARRGGBB)
  @param lineWidth The thickness of the circle. <span style="color:Aqua; font-weight:bold">Warning: if thickness is bigger than 1, it will not draw a perfectly filled circle</span>
  @return A new Sprite with a circle drawn onto it