PRTree优先级R-Tree

PRTree是一个实现了优先级R-Tree以及空间索引的Java开发包，代码示例：

PRTree tree = new PRTree (new Rectangle2DConverter (), 10);
Rectangle2D rx = new Rectangle2D.Double (0, 0, 1, 1);
tree.load (Collections.singletonList (rx));
for (Rectangle2D r : tree.find (0, 0, 1, 1)) {
    System.out.println ("found a rectangle: " + r);
}