arcgis engine实现点选河流代码
时间: 2023-07-30 20:12:08 浏览: 45
以下是使用 ArcGIS Engine 实现点选河流的代码示例:
```csharp
private void axMapControl1_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{
if (e.button != 1) return; // 只处理鼠标左键单击事件
IPoint point = new PointClass();
point.PutCoords(e.mapX, e.mapY);
// 创建空间查询过滤器
ISpatialFilter spatialFilter = new SpatialFilterClass();
spatialFilter.Geometry = point;
spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects; // 使用交叉空间关系进行查询
// 创建要素选择器
IFeatureLayer featureLayer = (IFeatureLayer)axMapControl1.get_Layer(0);
IFeatureSelection featureSelection = (IFeatureSelection)featureLayer;
featureSelection.Clear(); // 清空选择集
// 执行选择
featureSelection.SelectFeatures(spatialFilter, esriSelectionResultEnum.esriSelectionResultNew, false);
// 遍历选择集,获取被选中的河流要素
ISelectionSet selectionSet = featureSelection.SelectionSet;
ICursor cursor;
selectionSet.Search(null, false, out cursor);
IFeatureCursor featureCursor = (IFeatureCursor)cursor;
IFeature feature = featureCursor.NextFeature();
while (feature != null)
{
if (feature.Shape.GeometryType == esriGeometryType.esriGeometryPolyline) // 判断是否是线要素
{
// 在此处添加处理河流要素的代码
// 例如,可以获取河流名称等属性信息,或者在地图上高亮显示该要素
}
feature = featureCursor.NextFeature();
}
}
```
注:此代码仅供参考,实际使用时需要根据具体需求进行修改和完善。