title: Convert google maps polyline to html canvas line
body: <p>I need to show a google maps polyline into a html canvas. How I can convert the coordinates like this:</p>
  
  <pre><code>lat:25.5643498,lng:45.34492432 
  </code></pre>
  
  <p>to canvas coordinates like this?</p>
  
  <pre><code>x:230,y:445
  </code></pre>
  
  <p>I tried to "scale" down the coordinates from google but no success.</p>