public void mousePressed(MouseEvent e) {
    this.mousePoint = e.getPoint();

    Object topObject = null;
    PickedObjectList pickedObjects = this.wwd.getObjectsAtCurrentPosition();
    if (pickedObjects != null) topObject = pickedObjects.getTopObject();

    if (topObject instanceof ControlPointMarker) {
      this.activeControlPoint = (ControlPointMarker) topObject;
      this.activeAction = this.activeControlPoint.getType();

      setShowAnnotation(true);
      updateAnnotation(this.activeControlPoint.getPosition());

      // update controlPointIndex;
      int i = 0;
      for (Marker controlPoint : this.controlPoints) {
        if (controlPoint.equals(topObject)) break;
        i++;
      }
      this.activeControlPointIndex = i;
      e.consume();
    } else if (topObject == this.getPolygon()) {
      this.activeAction = MOVE_POLYGON_ACTION;

      // set the shape to be the "active control point"
      this.activeControlPointIndex = -1;

      setShowAnnotation(true);
      updateAnnotation(this.polygon.getReferencePosition());
      e.consume();
    }
  }