/**
   * write a 3D object in the dsf file
   *
   * @param object a xplane dsf object
   * @throws Osm2xpBusinessException
   */
  private void writeObjectToDsf(XplaneDsfObject object) throws Osm2xpBusinessException {

    String objectDsfText = object.asObjDsfText();
    writer.write(objectDsfText, GeomUtils.cleanCoordinatePoint(object.getOsmPolygon().getCenter()));
    // stats
    StatsHelper.addObjectType(dsfObjectsProvider.getObjectsList().get(object.getDsfIndex()), stats);
  }
  /**
   * write a building in the dsf file.
   *
   * @param polygon
   * @param facade
   * @param size
   */
  private void writeBuildingToDsf(OsmPolygon osmPolygon, Integer facade) {
    if (facade != null && osmPolygon.getHeight() != null) {
      StringBuffer sb = new StringBuffer();
      osmPolygon.setPolygon(GeomUtils.setClockwise(osmPolygon.getPolygon()));
      if (osmPolygon.getPolygon().getArea() * 100000000 > 0.1
          && osmPolygon.getPolygon().getVertexNumber() > 3) {

        sb.append("BEGIN_POLYGON " + facade + " " + osmPolygon.getHeight() + " 2");
        sb.append(System.getProperty("line.separator"));
        sb.append("BEGIN_WINDING");
        sb.append(System.getProperty("line.separator"));

        // on supprime le dernier point pour ne pas boucler
        osmPolygon.getPolygon().removePoint(osmPolygon.getPolygon().getLastPoint());
        for (Point2D loc : osmPolygon.getPolygon().getVertices()) {
          sb.append("POLYGON_POINT " + loc.y + " " + loc.x);
          sb.append(System.getProperty("line.separator"));
        }
        sb.append("END_WINDING");
        sb.append(System.getProperty("line.separator"));
        sb.append("END_POLYGON");
        sb.append(System.getProperty("line.separator"));

        // stats TODO not working anymore since v2 facades new features.
        if (dsfObjectsProvider.getPolygonsList().get(facade).toLowerCase().contains("building")
            || dsfObjectsProvider.getPolygonsList().get(facade).toLowerCase().contains("shape")) {
          StatsHelper.addBuildingType("Building", stats);
        } else {
          if (dsfObjectsProvider.getPolygonsList().get(facade).toLowerCase().contains("house")
              || dsfObjectsProvider
                  .getPolygonsList()
                  .get(facade)
                  .toLowerCase()
                  .contains("common")) {
            StatsHelper.addBuildingType("Residential", stats);
          } else {
            StatsHelper.addBuildingType("Facade rule", stats);
          }
        }
        writer.write(
            sb.toString(), GeomUtils.cleanCoordinatePoint(osmPolygon.getPolygon().getFirstPoint()));
      }
    }
  }
  /**
   * @param polygon the forest polygon
   * @param forestIndexAndDensity index and density of the forest rule
   */
  private void writeForestToDsf(OsmPolygon osmPolygon, Integer[] forestIndexAndDensity) {
    StringBuffer sb = new StringBuffer();
    sb.append("BEGIN_POLYGON " + forestIndexAndDensity[0] + " " + forestIndexAndDensity[1] + " 2");
    sb.append(System.getProperty("line.separator"));
    sb.append("BEGIN_WINDING");
    sb.append(System.getProperty("line.separator"));
    for (Point2D loc : osmPolygon.getPolygon().getVertices()) {
      sb.append("POLYGON_POINT " + loc.y + " " + loc.x);
      sb.append(System.getProperty("line.separator"));
    }
    sb.append("END_WINDING");
    sb.append(System.getProperty("line.separator"));
    sb.append("END_POLYGON");
    sb.append(System.getProperty("line.separator"));

    // stats
    StatsHelper.addForestType(
        dsfObjectsProvider.getPolygonsList().get(forestIndexAndDensity[0]), stats);

    writer.write(
        sb.toString(), GeomUtils.cleanCoordinatePoint(osmPolygon.getPolygon().getFirstPoint()));
  }