title: How to determine if a point is within an ellipse?
body: <p>I'm having troubles finding the classic 'Contains' method which returns if a point is within a rectangle, ellipse or some other object. These objects are in a canvas.</p>
  <p>I've tried VisualTreeHelper.FindElementsInHostCoordinates but I can't find the way.</p>
  <p>How can I do this?</p>