title: How to detect whether or not user is clicking inside Circle in python graphics window
body: <p>In my program I have three circles drawn in the graphics window, and I need different responses to occur depending on which one the user clicks on.</p>
  
  <pre><code>    cup1 = Circle(Point(35,100),25)
      cup1.draw(win)
      cup2 = cup1.clone()
      cup2.move(65,0)
      cup2.draw(win)
      cup3 = cup1.clone()
      cup3.move(130,0)
      cup3.draw(win)
  </code></pre>
  
  <p>So I need something that would work like this:</p>
  
  <pre><code>    userchoice = win.getMouse()
      cup1choice = False
      cup2choice = False
      cup3choice = False
      if userchoice in cup1:
          cup1choice = True
      if userchoice in cup2:
          cup2choice = True
      if userchoice in cup3:
          cup3choice = True
  </code></pre>
  
  <p>But I realize that a Circle is not iterable like that, so I'm looking for some other kind of method to determine whether the user is clicking inside cup 1, 2, or 3. If anyone can help I'd really appreciate it</p>