ArcGIS Editor工具，实现要素拖动、编辑 |
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ArcGIS 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。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： 复制内容到剪贴板 代码: private AxMapControl m_MapControl;//从外部传进来的MapControl控件 private ILayer m_SelectedLayer;//当前正在编辑的图层 private bool m_IsEdited = false;//当前是否处于编辑状态 private bool m_IsInUse = false;//这个其实我这里没有用到，这个实在创建新要素时用到的 private List m_SelectedFeature;//这个存储鼠标点击下，击中的要素 private IPoint m_CurrentMousePosition;//这个好像也没用到，记录当前鼠标的位置 private IDisplayFeedback m_FeedBack;//这个就是当前屏幕(鼠标动作)的反馈信息 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： 复制内容到剪贴板 代码:/// /// 开始编辑 /// /// public void StartEditing(bool bWithUndoRedo) { if (m_SelectedLayer == null) return; IFeatureLayer featureLayer = m_SelectedLayer as IFeatureLayer; if (featureLayer == null) return; 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IWorkspace，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 /// /// public void 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 (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： 复制内容到剪贴板 代码: public void 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 (featureClass == 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(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 esriGeometryType.esriGeometryPolygon: spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects; break; case esriGeometryType.esriGeometryPolyline: spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses; break; } spatialFilter.GeometryField = featureClass.ShapeFieldName; IQueryFilter 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 /// /// /// public void SelectOnMouseDown() { 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_MapControl.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：
复制内容到剪贴板 代码: /// /// 在要素上面绘制一个可拖拽的符号 /// /// public void DrawEditSymbol(IGeometry geometry, IDisplay display) { IEngineEditProperties engineProperty = new EngineEditorClass(); ISymbol pointSymbol = engineProperty.SketchVertexSymbol as ISymbol; ISymbol sketchSymbol = engineProperty.SketchSymbol as ISymbol; ITopologicalOperator pTopo = geometry as ITopologicalOperator; sketchSymbol.SetupDC(display.hDC, display.DisplayTransformation); sketchSymbol.Draw(pTopo.Boundary); IPointCollection pointCol = geometry as IPointCollection; for (int i = 0; i < pointCol.PointCount; i++) { IPoint point = pointCol.get_Point(i); pointSymbol.SetupDC(display.hDC, display.DisplayTransformation); pointSymbol.Draw(point); pointSymbol.ResetDC(); } ESRI.ArcGIS.ADF.ComReleaser.ReleaseCOMObject(sketchSymbol); ESRI.ArcGIS.ADF.ComReleaser.ReleaseCOMObject(pointSymbol); ESRI.ArcGIS.ADF.ComReleaser.ReleaseCOMObject(engineProperty); } 注意，这个函数是在MapControl的AfterDraw里面调用的，IDisplay参数，是AfterDraw事件的参数，我这里就没有画出来，类似ArcMap里面还有一个红色的节点，这里全是绿色的，因为红色对我的用处不大，也就没有必要了，当然各位看官可以自行修改，还有就是绘制符号的时候一定要记得释放内存哦~ 现在，编辑状态做好了，但是现在只是雏形，因为它还没有响应任何鼠标事件，当鼠标悬停在绿色的节点上时并不会让你可以拖拽，所以我们还要做点工作。 那现在就开始如果鼠标悬停在绿色节点上时的代码吧： 复制内容到剪贴板 代码: public void SnapVertex(int x,int y,IGeometry snapContainer,ref bool vertexSnaped,ref bool contained) { IPoint point = m_MapControl.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(x, y); IPoint pHitPoint = null; double hitDist = -1, tol = -1; int vertexIndex = -1, partIndex = -1; bool vertex = false; tol = ConvertPixelsToMapUnits(4); IHitTest pHitTest = snapContainer as IHitTest; bool bHit=pHitTest.HitTest(point, tol, esriGeometryHitPartType.esriGeometryPartVertex, pHitPoint, ref hitDist, ref partIndex, ref vertexIndex, ref vertex); vertexSnaped = false; contained = false; if (bHit) { m_MapControl.MousePointer = esriControlsMousePointer.esriPointerCrosshair; vertexSnaped = true; return; } else { IRelationalOperator pRelOperator=null; ITopologicalOperator pTopo = null; IGeometry buffer = null; IPolygon polygon = null; switch (snapContainer.GeometryType) { case esriGeometryType.esriGeometryPolyline: pTopo = snapContainer as ITopologicalOperator; buffer=pTopo.Buffer(3); polygon = buffer as IPolygon; pRelOperator=polygon as IRelationalOperator; break; case esriGeometryType.esriGeometryPolygon: polygon = snapContainer as IPolygon; pRelOperator=polygon as IRelationalOperator; break; case esriGeometryType.esriGeometryPoint: pTopo = snapContainer as ITopologicalOperator; buffer = pTopo.Buffer(3); polygon = buffer as IPolygon; pRelOperator = polygon as IRelationalOperator; break; default: break; } if (pRelOperator == null) return; if (pRelOperator.Contains(point)) { m_MapControl.MousePointer = esriControlsMousePointer.esriPointerSizeAll; contained = true; } else m_MapControl.MousePointer = esriControlsMousePointer.esriPointerArrow; return; } }这里就是根据鼠标悬停的位置，来改变鼠标样式，抱歉的很，我没有从AE里面找到和ArcMap一 样的鼠标样式，只要用一些简单的替代了，当然你可以自己定义，也可以打电话、发Email质问ESRI客服，如果你知道了，一定要告诉我，否则我诅咒你找 不到女朋友！这个函数里面，我需要判断，鼠标是悬停在要素的节点上，还是悬停在要素内部了，这个对于后面处理是拽节点还是移动要素有很大的帮助。
这个根据鼠标悬停位置改变鼠标样式，还远远不够滴，当你悬停到绿色节点上时，按下鼠标时，就意味这拖 拽开始，当鼠标左键按下并移动时，要出现像橡皮筋一样的连接线，当左键弹起时，就意味着拖拽结束，如果再按下左键，就意味着要素的编辑结束。这个怎么做到 呢，请看下面的代码： public bool EditFeature(int x,int y,IGeometry geometry) { GetFeatureOnMouseDown(x, y); SelectOnMouseDown(); if(m_SelectedFeature.Count0) { IGeometryCollection pGeoColl = geometry as IGeometryCollection; vertexOffset = 0; for (int i = 0; i < partIndex;i=2*i+1) { IPointCollection pointColl = pGeoColl.get_Geometry(i) as IPointCollection; vertexOffset = vertexOffset + pointColl.PointCount; } } return res; } /// /// 清除要素选择状态，恢复常态 /// public void 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。 希望大家能够有所启发，谢谢大家的支持！ |
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