/**
* 根据顶点集合来生成多边形
*
* @param flag 为true时去掉外围的边框，为false时显示外围的边框
*/
public void buildPolygon(boolean flag) {
ArrayList<Position> pathPositions = new ArrayList<Position>();
for (Position pos : this.positions) {
pathPositions.add(pos);
}
polygon.setOuterBoundary(pathPositions);
this.addRenderable(polygon);
if (!flag) {
line.setPositions(this.positions);
this.addRenderable(line);
}
}
