title: Adding lines and geometric shapes on matplotlib candlestick chart
body: <p>I have made a candlestick currency chart on python using <code>matplotlib.finance</code>. Everything is working but I would like to add lines and shapes on the actual chart. When I was using normal type of chart in matplotlib. I would be doing:</p>
  
  <pre><code>plt.plot([xmin, xmax], [0.0005,0.0005], linewidth=3, color='purple')
  </code></pre>
  
  <p>To draw a horizontal line from <code>xmin</code> to <code>xmax</code> (to be defined) at the 0.0005 price level.But since I am using the method <code>candlestick2_ohlc</code> I don't really know how to proceed...</p>
  
  <p>This is what I have:<a href="https://i.stack.imgur.com/Hs09U.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Hs09U.png" alt="enter image description here"></a></p>
  
  <p>This is what I am looking to get:<a href="https://i.stack.imgur.com/KXRBD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KXRBD.png" alt="enter image description here"></a></p>
  
  <p>Also is it possible to draw and fill triangles?</p>