ArcGIS Engine实现点选要素

最新推荐文章于 2021-08-26 14:36:25 发布

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本文介绍了一种基于ArcGIS的点击查询技术实现方案，通过获取点击位置坐标、生成缓冲区并查询与之相交的地理要素，实现地图上目标要素的快速定位与筛选。

大致分为三步

获得点击位置的坐标
根据坐标生成缓冲区
查询与缓冲区相交的要素

在AxMapControl的点击事件获得点击位置并转换为坐标

IPoint point = axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(MousePosition.X, MousePosition.Y);

获得查询的目标图层

ILayer pLayer = axMapControl1.get_Layer(5);

执行查询操作

List<IFeature> pFeaturesList = getPointSelect(point, pLayer as IFeatureLayer, 2);

根据点击位置进行查询的函数

        private List<IFeature> getPointSelect(IPoint pPoint,IFeatureLayer pFeatureLayer,double pRadius)
        {
            List<IFeature> pSelectedFeatureList = new List<IFeature>();  //返回要素类

            ITopologicalOperator pTop = pPoint as ITopologicalOperator;
            IGeometry pGeometry = pTop.Buffer(pRadius);  //建立缓冲区
            ISpatialFilter pSpatialFilter = new SpatialFilterClass();  //空间查询模块
            pSpatialFilter.Geometry = pGeometry;  //查询内容
            pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;  //求交

            IFeatureCursor pFeatureCursor = pFeatureLayer.FeatureClass.Search(pSpatialFilter, false);
            IFeature pFeature = pFeatureCursor.NextFeature();
            while (pFeature != null)
            {
                pSelectedFeatureList.Add(pFeature);
                pFeature = pFeatureCursor.NextFeature();
            }
            return pSelectedFeatureList;
        }