ITopologicalOperator接口使用

Erace功能的實現：

//ClipGeo要扣除的範圍；

//AnalysisFeat要分析的要素

        public static void Edit_Clip(IGeometry ClipGeo, IFeature AnalysisFeat)
        {
            IGeometry AnalysisGeo = AnalysisFeat.ShapeCopy;
            ITopologicalOperator TopGeo = AnalysisGeo as ITopologicalOperator;
            TopGeo.Simplify();
            IGeometry geo = TopGeo.Difference(ClipGeo);
            AnalysisFeat.Shape = geo;
            AnalysisFeat.Store();
        }