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ITopologicalOperator.ConvexHull Method

Constructs the convex hull of this geometry.

[C#]public IGeometry ConvexHull ();

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Description

The ConvexHull of a geometry is the minimal bounding polygon such that all outer angles are convex. The ConvexHull of a point is the point itself.

Remarks

ITopologicalOperator methods must be applied on high-level geometries only. High-Level geometries are point, multipoint, polyline and polygon. To use this method with low-level geometries such as segments (Line, Circular Arc, Elliptic Arc, Bézier Curve), paths or rings, they must be wrapped into high-level geometries types.

This method does not support GeometryBags. 

ConvexHull method does not deal with Z attribute now.

早知道有这个方法，之前就不用那么吃力的去计算了。。。。。。。

ConvexHull(凸包)_ArcGIS

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原文地址：http://www.cnblogs.com/The-SEA/p/4385228.html