title: opencv polygon with dotted or dashed lines
body: <p>I have a line of code here that uses the python binding for opencv:</p>
  
  <pre><code>cv2.polylines(mask, [pts],True, ignore_mask_color)
  </code></pre>
  
  <p>This draws a blue polygon on image mask.</p>
  
  <p>But is there a way the lines of the polygon can be stylized? Not too much. Just dotted, or dashed, that's it really.</p>