protected ShapeAttributes getInitialAttributes(String attrType) {
    ShapeAttributes attrs = new BasicShapeAttributes();

    if (KMLConstants.HIGHLIGHT.equals(attrType)) {
      attrs.setOutlineMaterial(Material.RED);
      attrs.setInteriorMaterial(Material.PINK);
    } else {
      attrs.setOutlineMaterial(Material.WHITE);
      attrs.setInteriorMaterial(Material.LIGHT_GRAY);
    }

    return attrs;
  }
  /**
   * Create a surface polygon from a KML GroundOverlay.
   *
   * @param tc the current {@link KMLTraversalContext}.
   * @param overlay the {@link gov.nasa.worldwind.ogc.kml.KMLGroundOverlay} to render as a polygon.
   * @throws NullPointerException if the geometry is null.
   * @throws IllegalArgumentException if the parent placemark or the traversal context is null.
   */
  public KMLSurfacePolygonImpl(KMLTraversalContext tc, KMLGroundOverlay overlay) {
    if (tc == null) {
      String msg = Logging.getMessage("nullValue.TraversalContextIsNull");
      Logging.logger().severe(msg);
      throw new IllegalArgumentException(msg);
    }

    if (overlay == null) {
      String msg = Logging.getMessage("nullValue.ParentIsNull");
      Logging.logger().severe(msg);
      throw new IllegalArgumentException(msg);
    }

    this.parent = overlay;

    // Positions are specified either as a kml:LatLonBox or a gx:LatLonQuad
    Position.PositionList corners = overlay.getPositions();
    this.setOuterBoundary(corners.list);

    if (overlay.getName() != null) this.setValue(AVKey.DISPLAY_NAME, overlay.getName());

    if (overlay.getDescription() != null)
      this.setValue(AVKey.BALLOON_TEXT, overlay.getDescription());

    if (overlay.getSnippetText() != null)
      this.setValue(AVKey.SHORT_DESCRIPTION, overlay.getSnippetText());

    String colorStr = overlay.getColor();
    if (!WWUtil.isEmpty(colorStr)) {
      Color color = WWUtil.decodeColorABGR(colorStr);

      ShapeAttributes attributes = new BasicShapeAttributes();
      attributes.setDrawInterior(true);
      attributes.setInteriorMaterial(new Material(color));
      this.setAttributes(attributes);
    }
  }