如何利用jts将点云构造成一个多边形

背景

原理

实现：

Coordinate[] coordinates = new Coordinate[]{
new Coordinate(0, 1),
new Coordinate(3, 4),
new Coordinate(1, 0),
new Coordinate(2, 0),
new Coordinate(2, 3),
new Coordinate(1, 2),
new Coordinate(3, 1),
new Coordinate(1, 1),
new Coordinate(2, 2)};

/*Coordinate[] coordinates = new Coordinate[]{
new Coordinate(0, 0),
new Coordinate(1, 1),
new Coordinate(2, 3)};*/
GeometryFactory gf = new GeometryFactory();
MultiPoint mp = gf.createMultiPoint(coordinates);
ConformingDelaunayTriangulationBuilder builder = new ConformingDelaunayTriangulationBuilder();

builder.setSites(mp);
//实际为GeometryCollection（组成的geometry紧密相连）
Geometry ts = builder.getTriangles(gf);

//以0的距离进行缓冲（因为各多边形两两共边），生成一个多边形
//此时则将点云构造成了多边形
Geometry union = ts.buffer(0);
String text = union.toText();
System.out.println(text);