/* (non-Javadoc)
   * @see net.sourceforge.arbaro.tree.TreeTraversal#visitLeaf(net.sourceforge.arbaro.tree.Leaf)
   */
  public boolean visitLeaf(Leaf leaf) {
    // prints povray code for the leaf
    String indent = "    ";

    w.println(
        indent
            + "object { "
            + povrayDeclarationPrefix
            + "leaf "
            + transformationStr(leaf.getTransformation())
            + "}");

    //		increment progress count
    exporter.incProgressCount(AbstractExporter.LEAF_PROGRESS_STEP);

    return true;
  }
  /* (non-Javadoc)
   * @see net.sourceforge.arbaro.tree.TreeTraversal#enterStem(net.sourceforge.arbaro.tree.Stem)
   */
  public boolean enterStem(Stem stem) {
    if (level >= 0 && stem.getLevel() < level) {
      return true; // look further for stems

    } else if (level >= 0 && stem.getLevel() > level) {
      return false; // go back to higher level

    } else {

      String indent = whitespace(stem.getLevel() * 2 + 4);
      NumberFormat fmt = FloatFormat.getInstance();
      Enumeration sections = stem.sections();

      if (sections.hasMoreElements()) {
        StemSection from = (StemSection) sections.nextElement();
        StemSection to = null;

        while (sections.hasMoreElements()) {
          to = (StemSection) sections.nextElement();

          w.println(
              indent
                  + "cone   { "
                  + vectorStr(from.getPosition())
                  + ", "
                  + fmt.format(from.getRadius())
                  + ", "
                  + vectorStr(to.getPosition())
                  + ", "
                  + fmt.format(to.getRadius())
                  + " }");

          // put spheres where z-directions changes
          if (!from.getZ().equals(to.getPosition().sub(from.getPosition()).normalize())) {

            w.println(
                indent
                    + "sphere { "
                    + vectorStr(from.getPosition())
                    + ", "
                    + fmt.format(from.getRadius() - 0.0001)
                    + " }");
          }

          from = to;
        }

        // put sphere at stem end
        /* FIXME? now using sections instead of segments, the spherical stem end
        *       will be made from several cones instead of one shpere ...

        			if ((to.getRadius() > 0.0001) ||
        					(lpar.nTaper>1 && lpar.nTaper<=2))
        			{
        				w.println(indent + "sphere { " + vectorStr(to.getPosition()) + ", "
        						+ fmt.format(to.getRadius()-0.0001) + " }");
        			}
        		*/
      }

      exporter.incProgressCount(AbstractExporter.STEM_PROGRESS_STEP);

      return true;
    }
  }