title: google.maps.Polyline - how to get a transparent / invisible polyline?
body: <p>I have the following code for a route where an animation goes on, so i need the polyline but i don't want to show it:</p>
  
  <pre><code>[..]
      this.polyline = new google.maps.Polyline({
                  path: [],
                  strokeColor: '#ffffff',
                  strokeWeight: 0
              });
  [..]
  </code></pre>
  
  <p>The polyline is shown with that code. But i want to make the polyline transparent - not visible! How can i do it?</p>
  
  <p>I set the <strong>strokeColor</strong> to "transparent" - what doesnt work, either not when i remove the option completely. I also set the <strong>strokeWeight</strong> to 0 - but these parameters have no effect. I tried also <strong>strokeOpacity</strong> from 0.0 to 1.0 - also no effect. Knows someone a solution? - PS: when i change the color to #ff0000 the color should be red, right? but it seems to be that the options doesn't work at all - but the polyline is shown and i have no JavaScript errors in the console.log...?</p>
  
  <p><a href="https://developers.google.com/maps/documentation/javascript/reference#PolylineOptions" rel="noreferrer">Here</a> the link to the reference with nearly the same example...</p>