/**
  * Render all cells.
  *
  * @param graphics
  * @param treemap
  */
 public void renderTree(TreemapGraphics graphics, Treemap treemap) {
   for (Object item : treemap.getElements()) {
     renderTree(graphics, treemap, item, false);
   }
 }
 /**
  * Render all labels.
  *
  * @param graphics
  * @param treemap
  * @param input
  */
 public void renderLabels(TreemapGraphics graphics, Treemap treemap) {
   Object[] elements = treemap.getElements();
   for (Object element : elements) {
     renderLabels(graphics, treemap, element, elements.length > 1, labelLevels);
   }
 }