Improved doctests.

lib/pixi/maps/geographics.js

@@ -26,6 +26,7 @@ export class GeoGraphics {
         this.drawEndHandler = new EventHandler('onDrawEnd', { listeners: onDrawEnd })
         this._points = null
         this._position = null
+        this.map = null
     }
 
     clone() {
@@ -91,6 +92,7 @@ export class GeoGraphics {
      * Called by the containing geo layer, when the map changes.
      */
     adaptTo(map) {
+        this.map = map
         this._points = this._adaptCoordinates(map)
         this._updatePosition()
         this.draw()