title: Fill canvas outside rectangle
body: <p>I want to fill the area outside a rectangle on a canvas. I use </p>
  
  <pre><code> canvas.drawRect(pTopLeft.x, pTopLeft.y, pBotRight.x, pBotRight.y, paint);
  </code></pre>
  
  <p>to draw the rectangle, but can't figure out how to fill outside the rectangle/clip.</p>
  
  <p>Thanks
  Geoff</p>