ArcEngine的拓扑分析之ITopologicalOperator
转载自:http://blog.csdn.net/anlidengshiwei/article/details/40377437
先来看看ITopologicalOperator的成员:截图来自帮助文档:
简要介绍下各个成员的汉语翻译:
1、Boundary,边界,获取一个Geometry的边界;
用法:
- ITopologicalOperator pTopologBoundary = pGeo as ITopologicalOperator;
- IGeometry pGeometry = pTopologBoundary.Boundary;
(1)多边形Polygon的边界获取的是Polyline
(2)Polyline获得的是IPiontColletion点集;(3)点没有边界
2、Buffer,缓冲区,可以为点、线、面做缓冲区,参数为缓冲区范围的大小,大于0向外做缓冲区,小于0向内做缓冲区;
用法:
- ITopologicalOperator pTopologBoundary = pGeo as ITopologicalOperator;
- Geometry pGeometry = pTopologBoundary.Buffer(2);
3、Clip,叠加裁剪,从源图层中裁剪掉分割图层后的图形;参数类型为IEnvelope类型
用法:
- ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator;
- pTopologBoundary.Clip(pClipGeometry.Envelope as IEnvelope);
4、Cut,分割,将一个Geometry分割为两部分。
用法:
- IGeometry pSourceGeometry = null, pClipGeometry = null;
- IGeometry pLeftGeo,pRightGo;
- IPolyline pPolyline=null;
- ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator;
- pTopologBoundary.Cut(pPolyline, out pLeftGeo, out pRightGo);
5、Difference,区别,保留下源图层与操作图层中不同的部分。
用法:
- IGeometry pSourceGeometry = null, pDifGeometry = null;
- ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator;
- IGeometry pResultGeo= pTopologBoundary.Difference(pDifGeometry);
6、Intersect,相交,求两个图层相交,返回IGeometry对象
用法:
- ITopologicalOperator pTopological = (pSubFeature.Shape) as ITopologicalOperator;
- IGeometry pGeoIntersect=pTopological.Intersect(pFeature.Shape, esriGeometryDimension.esriGeometry2Dimension);
7、IsSimple,是否拓扑闭合
用法:
- ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator;
- bool bIsSimple = pTopologBoundary.IsSimple;
8、Simplify,使一个Geometry拓扑闭合;
用法:
- ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator;
- pTopologBoundary.Simplify();
- 9、Union,使Geometry组合起来
- 用法:
- <pre name=“code” class=“csharp”>IGeometry pSourceGeometry = null, pUnionGeometry = null;
- ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator;
- IGeometry pUnionGeo=pTopologBoundary.Union(pUnionGeometry);
转载自:https://blog.csdn.net/knqiufan/article/details/78019404