title: Find the center of a line in WPF
body: <p>I'm working on an application, that the user clicks 2 points on a control, and a line is drawn connecting those 2 points. The problem is that I need to draw another line that starts on X.Y (returned by a function) intersects the line generated by the user right in the center of it.</p>
  
  <p>How can I do this?</p>
  
  <p>I'm using DrawingVisual and DrawingContext for this.</p>
  
  <p>Thanks</p>