public void getTiles(XQuadTree treeNode) {
if (!treeNode.isHasChild()) { // this is the leaf node
Rectangle2D.Double tile_rect = treeNode.getM_rect();
Point2D.Double offsetPoint = new Point2D.Double(tile_rect.getX(), tile_rect.getY());
X2DGrid grid = new X2DGrid(tile_rect, this.cell_size, offsetPoint);
this.m_tiles.put(treeNode.getIndex(), grid);
} else {
this.getTiles(treeNode.getM_tl_child());
this.getTiles(treeNode.getM_tr_child());
this.getTiles(treeNode.getM_bl_child());
this.getTiles(treeNode.getM_br_child());
}
}
