title: Draw two semi-circles
body: <p>I want to fill a circle with two semi-circles. One on the left side and the other one on the right side. The circle on the left side should be black and the other side should be blue. </p>
  
  <p>How do i achieve this? I tried to fill an ellipse and then draw a rectangle over the half of it. This works for one half of the circle. But with the other halfe i have a problem.</p>
  
  <p>Any ideas how can draw the complete circle?</p>