protected void movePolygon(Point previousMousePoint, Point mousePoint) {
    // Intersect a ray through each mouse point, with a geoid passing through the reference
    // elevation.
    // If either ray fails to intersect the geoid, then ignore this event. Use the difference
    // between the two
    // intersected positions to move the control point's location.

    View view = this.wwd.getView();
    Globe globe = this.wwd.getModel().getGlobe();

    Position refPos = this.polygon.getReferencePosition();
    if (refPos == null) return;

    Line ray = view.computeRayFromScreenPoint(mousePoint.getX(), mousePoint.getY());
    Line previousRay =
        view.computeRayFromScreenPoint(previousMousePoint.getX(), previousMousePoint.getY());

    Vec4 vec = AirspaceEditorUtil.intersectGlobeAt(this.wwd, refPos.getElevation(), ray);
    Vec4 previousVec =
        AirspaceEditorUtil.intersectGlobeAt(this.wwd, refPos.getElevation(), previousRay);

    if (vec == null || previousVec == null) {
      return;
    }

    Position pos = globe.computePositionFromPoint(vec);
    Position previousPos = globe.computePositionFromPoint(previousVec);
    LatLon change = pos.subtract(previousPos);

    this.polygon.move(new Position(change.getLatitude(), change.getLongitude(), 0.0));
  }
 /**
  * Determine the point at which a ray intersects a the globe at the elevation of the polygon.
  *
  * @param ray Ray to intersect with the globe.
  * @return The point at which the ray intersects the globe at the elevation of the polygon.
  */
 protected Vec4 intersectPolygonAltitudeAt(Line ray) {
   //  If there are control points computed, use the elevation of the first control point as the
   // polygon elevation.
   // Otherwise, if there are no control points, intersect the globe at sea level
   double elevation = 0.0;
   if (this.controlPoints.size() > 0) {
     elevation = this.controlPoints.get(0).getPosition().getElevation();
   }
   return AirspaceEditorUtil.intersectGlobeAt(this.wwd, elevation, ray);
 }
  protected void moveControlPoint(
      ControlPointMarker controlPoint, Point lastMousePoint, Point moveToPoint) {
    View view = this.wwd.getView();
    Globe globe = this.wwd.getModel().getGlobe();

    Position refPos = controlPoint.getPosition();
    if (refPos == null) return;

    Line ray = view.computeRayFromScreenPoint(moveToPoint.getX(), moveToPoint.getY());
    Line previousRay = view.computeRayFromScreenPoint(lastMousePoint.getX(), lastMousePoint.getY());

    Vec4 vec = AirspaceEditorUtil.intersectGlobeAt(this.wwd, refPos.getElevation(), ray);
    Vec4 previousVec =
        AirspaceEditorUtil.intersectGlobeAt(this.wwd, refPos.getElevation(), previousRay);

    if (vec == null || previousVec == null) {
      return;
    }

    Position pos = globe.computePositionFromPoint(vec);
    Position previousPos = globe.computePositionFromPoint(previousVec);
    LatLon change = pos.subtract(previousPos);

    java.util.List<LatLon> boundary = new ArrayList<LatLon>();
    for (LatLon ll : this.polygon.getOuterBoundary()) {
      boundary.add(ll);
    }

    boundary.set(controlPoint.getIndex(), new Position(pos.add(change), refPos.getAltitude()));

    // ExtrudedPolygon ensures that the last boundary position is the same as the first. Remove the
    // last point
    // before setting the boundary.
    boundary.remove(boundary.size() - 1);

    this.polygon.setOuterBoundary(boundary);
  }