获取Polyline自相交点
背景:
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如果Polyline不为简单的几何图形,则求出其自相交的点。如果FromPoint和ToPoint重合也一并返回。
实现逻辑:
一、创建IMulitPoint pTargetPoint
二、判断Polyline是否首尾相接,如果首尾相接,将点加入到pTargetPoint;
三、判断Polyline是否为简单的几何图形,如果不是则进行以下步骤:
1)得出Polyline中所有Path的起点和终点,List
2)将Polyline简单化,得出所有Path在LstOrigin中找不到的起点和终点,添加到pTargetPoint中
第三步的代码:
private IMultipoint getInersectPoint(IPolyline pPolyline) { IGeometryCollection pGeoColl = pPolyline as IGeometryCollection; ListlstPoint = new List (); for (int i = 0; i < pGeoColl.GeometryCount; i++) { IPath pPath = pGeoColl.get_Geometry(i) as IPath; IPoint pTemp = lstPoint.Find(p => (p.X == pPath.FromPoint.X && p.Y == pPath.FromPoint.Y)); if (pTemp == null) lstPoint.Add(pPath.FromPoint); pTemp = lstPoint.Find(p => (p.X == pPath.ToPoint.X && p.Y == pPath.ToPoint.Y)); if (pTemp == null) lstPoint.Add(pPath.ToPoint); } ITopologicalOperator2 ptopo = pPolyline as ITopologicalOperator2; ptopo.IsKnownSimple_2 = false; ptopo.Simplify(); IMultipoint pMultipoint = new MultipointClass(); IPointCollection pPointColl = pMultipoint as IPointCollection; for (int i = 0; i < pGeoColl.GeometryCount; i++) { IPath pPath = pGeoColl.get_Geometry(i) as IPath; IPoint pTemp = lstPoint.Find(p => (p.X == pPath.FromPoint.X && p.Y == pPath.FromPoint.Y)); if (pTemp == null) pPointColl.AddPoint(pPath.FromPoint); pTemp = lstPoint.Find(p => (p.X == pPath.ToPoint.X && p.Y == pPath.ToPoint.Y)); if (pTemp == null) pPointColl.AddPoint(pPath.ToPoint); } return pMultipoint; }
当前题目:获取Polyline自相交点
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