简单TIN创建方法类，支持极端数据创建，比如两个或多个点非常接近情况。 1、dataSet方法用于数据传入 2、create方法开始创建TIN 3、sizeTin方法获取三角网个数 4、dataTin方法获取指定三角网三个顶点的索引-TIN simple method to create categories, support for the creation of extreme data, such as two or more points, very close to the situation. 1, dataSet methods for data imported 2, create way to start creating TIN 3, sizeTin triangulation method to get the number 4, dataTin designated triangulation method to get the three vertex index