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1、ArcMap的 Editor工具，实现要素拖动、编辑。本来根本没有写这个工具的意思，自己一直用的Ae 自带的工具。虽然可控制力弱了一些，但终究还是凑或能用。一天，问到一个同学，想请教一下，居然以百般理由回绝。算了，秉承毛老人家的口号：自力更生，丰衣足食！好了，闲话少说，各位看官，咱步入正题了。首先，说一下，所有的要素的更新、插入、删除最好放在编辑的Session 里面，即以一对StartEditing和 StopEditing包裹。一开始我的疑问在于，为什么我用IWorkspaceEdit的 StartEditing方法后，怎么鼠标不会变成AcrMap里面 Editor的开始编辑那样呢， 为什
2、么不能选中要素， 为什么不能双击后编辑要素？原来，选中要素和使要素处于编辑状态还是要自己写的(经高人指点，呵呵 )。先介绍一下程序中用到的变量：Code 那我们就按照逻辑顺序来一一展示这个到底是怎么做的。首先是，开始和结束编辑的代码：/开始编辑/ publicvoid StartEditing(bool bWithUndoRedo) if (m_SelectedLayer = null) return; IFeatureLayer featureLayer = m_SelectedLayer as IFeatureLayer; if (featureLayer = null) return;
3、IFeatureClass featureClass = featureLayer.FeatureClass; if (featureClass = null) return; IDataset dataset = featureClass as IDataset; IWorkspaceEdit workspaceEdit = dataset.Workspace as IWorkspaceEdit; try workspaceEdit.StartEditing(bWithUndoRedo); m_IsEdited = true; catch return; 当然你可以直接传进来IWorkspa
4、ce，这个可根据你具体的需求，我这里用当前图层获取工作空间。/结束编辑/ publicvoid StopEditing(bool bSave) if (m_IsEdited) m_IsEdited = false; if (m_SelectedLayer = null) return; IFeatureLayer featureLayer = m_SelectedLayer as IFeatureLayer; if (featureLayer = null) return; IFeatureClass featureClass = featureLayer.FeatureClass; if (
5、featureClass = null) return; IDataset dataset = featureClass as IDataset; IWorkspaceEdit workspaceEdit = dataset.Workspace as IWorkspaceEdit; if (workspaceEdit.IsBeingEdited() try workspaceEdit.StopEditing(bSave); catch workspaceEdit.AbortEditOperation(); return; 开始编辑已经好了，然后就是鼠标点击要素时候，让其处于选中状态，我这里为了
6、方便控制，我分成了两个函数写，给为看官也可以合并成一个：publicvoid GetFeatureOnMouseDown(int x, int y) m_SelectedFeature.Clear(); try if (m_SelectedLayer = null) return; IFeatureLayer featureLayer = m_SelectedLayer as IFeatureLayer; if (featureLayer = null) return; IFeatureClass featureClass = featureLayer.FeatureClass; if (fe
7、atureClass = null) return; IPoint point = m_MapControl.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y); IGeometry geometry = point as IGeometry; double length = ConvertPixelsToMapUnits(4); ITopologicalOperator pTopo = geometry as ITopologicalOperator; IGeometry buffer = pTopo.Buffer(
8、length); geometry = buffer.Envelope as IGeometry; ISpatialFilter spatialFilter = new SpatialFilterClass(); spatialFilter.Geometry = geometry; switch (featureClass.ShapeType) case esriGeometryType.esriGeometryPoint: spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains; break ; case es
9、riGeometryType.esriGeometryPolygon: spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects; break ; case esriGeometryType.esriGeometryPolyline: spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses; break ; spatialFilter.GeometryField = featureClass.ShapeFieldName; IQue
10、ryFilter filter = spatialFilter as IQueryFilter; IFeatureCursor cursor = featureClass.Search(filter, false); IFeature pfeature = cursor.NextFeature(); while (pfeature != null) m_SelectedFeature.Add(pfeature); pfeature = cursor.NextFeature(); catch return; /根据鼠标点击位置使击中要素处于高亮显示状态/ publicvoid SelectOnM
11、ouseDown() try if (m_SelectedLayer = null) return; m_MapControl.Map.ClearSelection(); m_MapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null); foreach (IFeature feature in m_SelectedFeature.ToArray() m_MapControl.Map.SelectFeature(m_SelectedLayer, feature); m_MapCo
12、ntrol.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null); catch return; 相信大家对第一个函数并不陌生吧？对的，就是用的空间查询，把点击中的要素放进容器，再用第二个函数进行高亮显示。这个地方注意，如果数据量比较多，强烈推荐用PartialRefresh 而不要用 Refresh ，参数的含义请参考帮助。这个只是开始编辑后，可以用鼠标点击选中要素，使其处于高亮状态，然而，ArcMap里面双击要素怎么出现节点用以编辑呢？这个是要自己绘制到MapControl上面去的：/在要素
13、上面绘制一个可拖拽的符号/ publicvoid DrawEditSymbol(IGeometry geometry, IDisplay display) IEngineEditProperties engineProperty = new EngineEditorClass(); ISymbol pointSymbol = engineProperty.SketchVertexSymbol as ISymbol; ISymbol sketchSymbol = engineProperty.SketchSymbol as ISymbol; ITopologicalOperator pTopo
14、= geometry as ITopologicalOperator; sketchSymbol.SetupDC(display.hDC, display.DisplayTransformation); sketchSymbol.Draw(pTopo.Boundary); IPointCollection pointCol = geometry as IPointCollection; for ( int i = 0; i 0) IGeometryCollection pGeoColl = geometry as IGeometryCollection; vertexOffset = 0; f
15、or ( int i = 0; i /清除要素选择状态，恢复常态/ publicvoid ClearSelection() m_MapControl.Map.ClearSelection(); m_MapControl.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, m_SelectedLayer, null); 各位看官，由于要素的移动、要素的创建和要素编辑在代码逻辑上差不多，所以我就不做过多阐述了，都是在处理鼠标的事件，需要做判断。其实，可能有看官已经了解，在AE 的帮助里面就有类似的代码，是的，我参考了这部分代码，并对ESRI的开发和工作人员表示感谢。最后，谢谢AE 开发群一叶知秋老大哥的帮助，总是在繁忙之中耐心的指导，再次表示感谢。希望大家能够有所启发，谢谢大家的支持！示例源码下载地址http:/
