希望指正。
在 ITools 类中，部分方法如下：
public override void OnMouseDown(int Button, int Shift, int X, int Y)
{
if (Button != 1)
return;
#region……分割面
//根据已选择的要分割的要素的类型绘制分割线
if (pFeatureLayer.FeatureClass.ShapeType==esriGeometryType.esriGeometryPolygon)
{//分割线的样式
IScreenDisplay pScreenDisplay = m_hookHelper.ActiveView.ScreenDisplay;
ISimpleLineSymbol pLineSymbol = new SimpleLineSymbolClass();
IRgbColor pRgbColor = new RgbColorClass();
pRgbColor.Red = 255;
pLineSymbol.Color = pRgbColor;
IRubberBand pRubberBand = new RubberLineClass();
IPolyline pPolyline = (IPolyline)pRubberBand.TrackNew(pScreenDisplay, (ISymbol)pLineSymbol);
pScreenDisplay.StartDrawing(pScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
pScreenDisplay.SetSymbol((ISymbol)pLineSymbol);
pScreenDisplay.DrawPolyline(pPolyline);
pScreenDisplay.FinishDrawing();
//清理将被分割的要素
ITopologicalOperator pTopoOpo;
pTopoOpo = pPolyline as ITopologicalOperator;
pTopoOpo.Simplify();//确保几何体的拓扑正确
m_engineEditor.StartOperation();
//分割方法
SplitPolygon(pSelectionSet, pPolyline);
ReBackStates();//刷新返回修改工具
m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, m_hookHelper.ActiveView.Extent);
}
#endregion
#region……鼠标画线分割线
//根据分割要素的类型绘制分割线
if (pFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline)
{
IScreenDisplay pScreenDisplay = m_hookHelper.ActiveView.ScreenDisplay;
ISimpleLineSymbol pLineSymbol = new SimpleLineSymbolClass();
IRgbColor pRgbColor = new RgbColorClass();
pRgbColor.Red = 255;
pLineSymbol.Color = pRgbColor;
IRubberBand pRubberBand = new RubberLineClass();
IPolyline pPolyline = (IPolyline)pRubberBand.TrackNew(pScreenDisplay, (ISymbol)pLineSymbol);
pScreenDisplay.StartDrawing(pScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
pScreenDisplay.SetSymbol((ISymbol)pLineSymbol);
pScreenDisplay.DrawPolyline(pPolyline);
pScreenDisplay.FinishDrawing();
m_engineEditor.StartOperation();//开启编辑
//分割方法
SplitPolyline(pSelectionSet, pPolyline);
ReBackStates();
m_hookHelper.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, m_hookHelper.ActiveView.Extent);
}
#endregion
m_engineEditor.StopOperation("ControlToolsEditing_CreateNewFeatureTask");
}
//分割面
public void SplitPolygon(ISelectionSet pSelectionSet, IGeometry pGeometry)
{
//使用空间过滤器来获得将要与线或点进行分割的要素类
IFeatureCursor pFeatCursor;
ICursor pCursor;
ISpatialFilter pSpatialFilter;
pSpatialFilter = new SpatialFilterClass();
pSpatialFilter.Geometry = pGeometry;
if (pGeometry.GeometryType == esriGeometryType.esriGeometryPolyline)//.esriGeometryPoint)
{
pSpatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses;//空间关系
}
pSelectionSet.Search(pSpatialFilter, true, out pCursor);
pFeatCursor = pCursor as IFeatureCursor;
//清理将被分割的要素
ITopologicalOperator pTopoOpo;
pTopoOpo = pGeometry as ITopologicalOperator;
pTopoOpo.Simplify();//确保几何体的拓扑正确
IFeature pFeature;
pFeature = pFeatCursor.NextFeature();
if (pFeature == null) return;
while (pFeature != null)
{
IFeatureEdit pFeatureEdit;
pFeatureEdit = pFeature as IFeatureEdit;
ISet pSet;
pSet = pFeatureEdit.Split(pGeometry);//直接用线分割
for (int setCount = 0; setCount < pSet.Count; setCount++)
{
pFeature = pSet.Next() as IFeature;
//featureSelection.SelectionSet.Add(pFeature.OID);
}
pFeature = pFeatCursor.NextFeature();
}
MessageBox.Show("面分割完毕！继续选择以分割！");
}
//分割线，线要素不能用线来分割，得用点来。所以要将分割线与被分割线求交叉点
public void SplitPolyline(ISelectionSet pSelectionSet, IGeometry pGeometry)
{
IFeatureClass featureClass=pFeatureLayer.FeatureClass;
IEnumIDs enumIDs = pSelectionSet.IDs;
int id = enumIDs.Next();
while(id!=-1)
{
pFeature = featureClass.GetFeature(id);
IGeometry pGeo = pFeature.ShapeCopy;
//由于在拓扑是需要空间参考一致，所以要将空间参考坐标设置一下。
pGeo.SpatialReference = pGeometry.SpatialReference;
ITopologicalOperator pTopoOpo = pGeo as ITopologicalOperator;
//Intersect（）方法求出来的是MultiPoint，而不是单点
IPointCollection pPCol = pTopoOpo.Intersect(pGeometry, esriGeometryDimension.esriGeometry0Dimension) as IPointCollection;
pTopoOpo.Simplify();
if (pPCol == null)//如果没有相交的，那么点集就为空。
return;
if (pPCol.PointCount == 0)//如果选择的线有一些没有与分割线相交，那么PointCount为0，但是0并不是null。
{
id = enumIDs.Next();//那么就Next（），让他进入下一个回合吧
continue;
}
IFeatureEdit pFeatureEdit;
pFeatureEdit = pFeature as IFeatureEdit;
ISet pSet;
pSet = pFeatureEdit.Split(pPCol.get_Point(0));
pSet.Reset();
//这一步进入分割大赛，其实分割为两个部分，当然要是只是分割单个要素的话就用不着里面那一层嵌套循环了。
for (int setCount = 0; setCount < pSet.Count; setCount++)
{
pFeature = pSet.Next() as IFeature;
if (pFeature == null) return;
for (int i = 1; i < pPCol.PointCount; i++)
{
try
{
pFeatureEdit = pFeature as IFeatureEdit;
IPoint pPoint = pPCol.get_Point(i);
pSet = pFeatureEdit.Split(pPoint);//这里新产生的线要素，可能与下一个交点进行分割，所以要重新获取以便进行下一次分割
pSet.Reset();
pPCol.RemovePoints(i, 1);//为了少循环一次，用了一个点就从点集中移除它，因为两线相交肯定没有二心。
break;//打断，这一步是迫不得已的，因为懒得去想另一部分。当然这样的话有个问题：如3点分线应该是4段，但如果这点刚好是中间的点，那么就会丢掉他前面或者后面的一个分割点，如此的话就变成2点分线为3段了；而且画的分割折线与被分割线交点越多丢失的就越多。主要原因是MultiPoint撞到IPointCollection中后顺序并不是画线时候的交叉顺序。怎么办呢？
}
catch
{
continue;
}
}
}
id = enumIDs.Next();
}
MessageBox.Show("线分割完毕！继续选择以分割！");
}
private void ReBackStates()
{
//清空选择集
ICommand pCommand = new ControlsClearSelectionCommandClass();
pCommand.OnCreate(pMapControl.Object);
pCommand.OnClick();
pCommand = new ControlsEditingEditToolClass();
pCommand.OnCreate(pMapControl.Object);
pMapControl.CurrentTool = pCommand as ITool;
}