ArcEngine数据编辑–选择要素

要编辑要素，首先要选中要素，按shift键进行多选，按esc键清空选择。

个人了解的选择高亮显示有两种方式，都是在public override void OnMouseDown(int Button, int Shift, int X, int Y)事件中处理实现：

1、  IFeatureSelection 这个要求明确选择的图层

IPoint pPoint = pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);

                IEnvelope pEnvelope;

                double tol = 20;

                pEnvelope = pPoint.Envelope;

                pEnvelope.Width = pEnvelope.Width + tol;

                pEnvelope.Height = pEnvelope.Height + tol;

                pEnvelope.CenterAt(pPoint);

 

                ISpatialFilter pSpatialFilter;

                pSpatialFilter = new SpatialFilterClass();

                pSpatialFilter.Geometry = pEnvelope;

                pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;

                IFeatureSelection pFeatureSelection;

                pFeatureSelection = ucDrawPanel.currentFeatureLayer as IFeatureSelection;

                IFeature pFeature;

                ucDrawPanel.unionFeature = new List<IFeature>();//实例化合并要素集

                if (Shift == 1)

                {

                    if (ucDrawPanel.currentFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline)

                    {

                        pFeatureSelection.SelectFeatures(pSpatialFilter,

                            esriSelectionResultEnum.esriSelectionResultAdd, true);

                        ICursor pCursor;

                        pFeatureSelection.SelectionSet.Search(null, false, out pCursor);

                    }

                }

                else

                {

                    pActiveView.FocusMap.ClearSelection();

                    pFeatureSelection.SelectFeatures(pSpatialFilter,

                        esriSelectionResultEnum.esriSelectionResultNew, true);

 

                    ICursor pCursor;

                    pFeatureSelection.SelectionSet.Search(null, false, out pCursor);                 

                }

                pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, ucDrawPanel.currentFeatureLayer, null);

                //高亮显示出来

                ISimpleFillSymbol iFillSymbol;

                ISymbol iSymbol;

                IRgbColor iRgbColor;

                iFillSymbol = new SimpleFillSymbol();

                iFillSymbol.Style = esriSimpleFillStyle.esriSFSSolid;

                iRgbColor = new RgbColor();

                iRgbColor.Green = 128;

                iFillSymbol.Color = iRgbColor;

                iSymbol = (ISymbol)iFillSymbol;

                iSymbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;

 

                IEnumFeature pEnumFeature = pActiveView.FocusMap.FeatureSelection as IEnumFeature;

                pEnumFeature.Reset();

                pFeature = pEnumFeature.Next();

                //选中要素高亮显示

                if (pFeature != null)

                {

                    IGeometry pGeometry = pFeature.Shape;

                    ITopologicalOperator pTop = pGeometry as ITopologicalOperator;

                    while (pFeature != null)

                    {

                        ucDrawPanel.unionFeature.Add(pFeature);

 

                        pGeometry = pTop.Union(pFeature.Shape);

                        pTop = pGeometry as ITopologicalOperator;

                        pFeature = pEnumFeature.Next();

                    }

                    ucDrawPanel.currentFeature = ucDrawPanel.unionFeature[ucDrawPanel.unionFeature.Count – 1];

                    _mapCtrl.FlashShape(pGeometry, 1, 500, iSymbol);

                }

                //清空选择要素

                else

                {

                    pActiveView.FocusMap.ClearSelection();

                    pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, pActiveView.Extent);

                }

 

2、  SelectByMap 基于整个地图，当然也可以先将图层的selectable属性动态设置下

 

if (Button == 1)

                {

                    //清空地图视图

                    _mapCtrl.Map.ClearSelection();

                    IGraphicsContainer pContainer = _mapCtrl.Map as IGraphicsContainer;

                    pContainer.DeleteAllElements();

                    _mapCtrl.ActiveView.Refresh();

 

                    base.OnMouseDown(Button, Shift, X, Y);

 

                    IActiveView pActiveView = _mapCtrl.ActiveView;

                    IPoint pPoint = pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X, Y);

                    IPoint TempPoint = pActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X + 5, Y + 5);

 

                    IEnvelope objEnvelope;

                    double tol = Math.Abs(TempPoint.X – pPoint.X);

                    objEnvelope = pPoint.Envelope;

                    objEnvelope.Width = objEnvelope.Width + tol;

                    objEnvelope.Height = objEnvelope.Height + tol;

                    objEnvelope.CenterAt(pPoint);

                    setSelectable(ucDrawPanel.currentLayerName);//只有当前编辑图层可选

 

                    _mapCtrl.Map.SelectByShape((IGeometry)objEnvelope, null, true);//只选择一个要素

                    pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, _mapCtrl.ActiveView.Extent);

 

                    ucDrawPanel.currentFeatureLayer = GetLayerByName(_mapCtrl, ucDrawPanel.currentLayerName);

                    if (ucDrawPanel.currentFeatureLayer != null)

                    {

                        ucDrawPanel.currentFeature = GetFeatureBySelection(ucDrawPanel.currentFeatureLayer);

                    }

                    else

                    {

                        MessWin messWin = new MessWin();

                        messWin.SetTitleAndMess(“提示”, @”获取选择要素出错！”, false);

                        return;

                    }

                }

 

PS：esc键退出，在OnKeyDown事件中实现

public override void OnKeyDown(int keyCode, int Shift)

        {

            if (keyCode == (int)Keys.Escape)

            {

                IActiveView pActiveView = _mapCtrl.ActiveView;

                pActiveView.FocusMap.ClearSelection();

                pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, pActiveView.Extent);

                _mapCtrl.CurrentTool = null;

            }

        }