float x1 = (float)(x - radius * (float)System.Math.Cos(i * (2f * pi / resolution)));
                float y1 = (float)(y - radius * (float)System.Math.Sin(i * (2f * pi / resolution)));
                x1 = (float)(x + (float)System.Math.Cos(angle) * (x1 - x) - (float)System.Math.Sin(angle) * (y1 - y));
                y1 = (float)(y + (float)System.Math.Sin(angle) * (x1 - x) + (float)System.Math.Cos(angle) * (y1 - y));