scene.addChild(area);
isSelecting = true;
// ��ԭѡ����������ݱ�غ�ɫ
for (Widget lw: nodeList) {
Border border = lw.getBorder();
if (border instanceof LozengeBorder)
((LozengeBorder) border).setColor(Color.BLACK);
if (border instanceof TriangleBorder)
((TriangleBorder) border).setColor(Color.BLACK);
if (border instanceof RectangleBorder)