title: How to draw polygon on angular google maps using @agm-core?
body: <p>In my application, I use Angular Google Maps (AGM) to build a map. How can I draw a polygon on it? I followed the solution described in <a href="https://stackblitz.com/edit/agm-polygon" rel="nofollow noreferrer">https://stackblitz.com/edit/agm-polygon</a> but some directives are missing. How can I enable the drawing manager on the AGM map and draw polygons like in the example?</p>
  
  <p>This is the import in the app.module:</p>
  
  <pre><code>AgmCoreModule.forRoot({
        apiKey: 'key',      
        language: localStorage &amp;&amp; localStorage.defaultLang || 'el',
        libraries: ['places', 'drawing', 'geometry']
      })
  </code></pre>