编辑时snapping的添加

最新推荐文章于 2024-09-22 18:26:26 发布

转载最新推荐文章于 2024-09-22 18:26:26 发布 · 72 阅读

本文介绍如何在ArcGIS中实现snapping功能，通过编辑模式下的特定操作，包括启动编辑工作空间、设置目标图层及添加捕捉代理等步骤来确保绘制地理要素时能精确对齐现有要素。

注意需要在编辑模式下进行snapping的添加（也即先需要使用IEngineEditor进入编辑状态）：

IMapControl3 mMap = (IMapControl3)((IToolbarControl)toolHook).Buddy;
IEngineEditor m_engineEditor = new EngineEditorClass();
if (m_engineEditor.EditState == esriEngineEditState.esriEngineStateNotEditing)
{
    //Start editing the workspace of the first feature layer found.        
    ILayer currentLayer = mMap.get_Layer(0);
    if (currentLayer is IFeatureLayer)
    {
        IFeatureLayer featureLayer = currentLayer as IFeatureLayer;
        IDataset dataset = featureLayer.FeatureClass as IDataset;
        IWorkspace workspace = dataset.Workspace;
        m_engineEditor.StartEditing(workspace, mMap.Map);
        ((IEngineEditLayers)m_engineEditor).SetTargetLayer(featureLayer, 0);
    }
    //snapping
    if (mMap.LayerCount != 0)
    {
        IEngineEditor editor = new EngineEditorClass();
        IEngineEditLayers editLayers = editor as IEngineEditLayers;
        IEngineSnapEnvironment snapEnvironment = editor as IEngineSnapEnvironment;

        IEngineFeatureSnapAgent featureSnapAgent = new EngineFeatureSnap();
        featureSnapAgent.FeatureClass = ((IFeatureLayer)mMap.get_Layer(0)).FeatureClass; ;
        featureSnapAgent.HitType = esriGeometryHitPartType.esriGeometryPartVertex | esriGeometryHitPartType.esriGeometryPartBoundary | esriGeometryHitPartType.esriGeometryPartEndpoint;
        snapEnvironment.AddSnapAgent(featureSnapAgent);                    
    }

}