public void DrawEllipse(float x, float y, float width, float height, System.Drawing.Color clr)
{
SharpDX.Mathematics.Interop.RawVector2 center = new SharpDX.Mathematics.Interop.RawVector2(x, y);
SharpDX.Direct2D1.SolidColorBrush brush = new SharpDX.Direct2D1.SolidColorBrush(d2dRenderTarget, ToColor(clr));
SharpDX.Direct2D1.Ellipse ellipse = new SharpDX.Direct2D1.Ellipse(center, width, height);
d2dRenderTarget.DrawEllipse(ellipse, brush);
brush.Dispose();
}