arcengine 按面积（批量）分割

第一、填写面积，选择分割方式（横向、纵向、鼠标指向）

二、开始分割，只需对分割的地块，绘制一条线段

三、完成分割

axMapControl1_OnMouseDown事件下

            #region 面积分割if (areaDi){if (axMapControl1.Map.LayerCount == 0) return;if (axMapControl1.Map.LayerCount > 1){MessageBox.Show("请只添加一个图层!", "提示");return;}// TODO:  Add Cut.OnMouseDown implementationif (e.button == 1)//左键按下{IFeatureLayer pFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;//划线IGeometry pline = (IGeometry)axMapControl1.TrackLine();//拿到划线范围内的所有featureIGeometry pGeometry = pline as IGeometry;IMap pMap = axMapControl1.Map;pMap.SelectByShape(pGeometry, null, false);//< br >//转成IRealtionOperator接口，以便在遍历时判断几何位置关系。IRelationalOperator rela = (pline as IPolyline) as IRelationalOperator;//拿到切割目标集合IEnumFeature pEnumFeature = (IEnumFeature)pMap.FeatureSelection;IEnumFeatureSetup pEnumFeatureSetup = pEnumFeature as IEnumFeatureSetup;pEnumFeatureSetup.AllFields = true;IFeature pFeature = pEnumFeature.Next();IFeature fsFeature = null;//依次遍历while (pFeature != null){if (rela.Crosses(pFeature.Shape) || fsFeature != null)//判断是否Cross  (rela.Crosses(pFeature.Shape)){// FrmPartitionarea frmPartitionarea = new FrmPartitionarea((pFeature.Shape as IArea).Area);// frmPartitionarea.Owner = this;//frmPartitionarea.Show();//if (frmPartitionarea.ShowDialog() == DialogResult.OK)//{if (Math.Round((pFeature.Shape as IArea).Area, 2) < Math.Round(divisionArea, 2)){MessageBox.Show("分割面积大约图斑面积!", "错误");//return;//当分割面积大约面要素面积时，返回pFeature = pEnumFeature.Next();continue;}try{//把面转成ITopologicalOperator，使用Cut函数ITopologicalOperator topo = (pFeature.Shape as IPolygon) as ITopologicalOperator;//新建两个面，作为切割函数的参数，切割后的两个对象保存于这两个面之中IGeometry pLeftGeometry = new PolygonClass();IGeometry pRightGeometry = new PolygonClass();double yValue = pFeature.Shape.Envelope.YMax - pFeature.Shape.Envelope.YMin;double xValue = pFeature.Shape.Envelope.XMax - pFeature.Shape.Envelope.XMin;bool plusChk = false;bool reduceChk = false;bool fgChk = false;double left = 0;double right = 0;double newValue = 0;double newValue2 = 0;List<double> oldleft = new List<double>();bool chkFX = false;bool chkcw = false;int n = 0;for (int j = 0; j < 100; j++){IPoint point1 = new PointClass();IPoint point2 = new PointClass();ILine newline = new LineClass();IPolyline fgx = null;//double count = pFeature.Shape.Envelope.YMax - pFeature.Shape.Envelope.YMin;//pline.if (portrait1)//纵{if (j == 0){point1.X = pFeature.Shape.Envelope.XMin + xValue / 2;point1.Y = pFeature.Shape.Envelope.YMin;point2.X = pFeature.Shape.Envelope.XMin + xValue / 2;point2.Y = pFeature.Shape.Envelope.YMax;newValue = pFeature.Shape.Envelope.XMin + xValue / 2;}else if (plusChk){point1.X = newValue + (xValue / Math.Pow(2, j + 1));point1.Y = pFeature.Shape.Envelope.YMin;point2.X = newValue + (xValue / Math.Pow(2, j + 1));point2.Y = pFeature.Shape.Envelope.YMax;newValue = newValue + (xValue / Math.Pow(2, j + 1));}else if (reduceChk){point1.X = newValue - (xValue / Math.Pow(2, j + 1));point1.Y = pFeature.Shape.Envelope.YMin;point2.X = newValue - (xValue / Math.Pow(2, j + 1));point2.Y = pFeature.Shape.Envelope.YMax;newValue = newValue - (xValue / Math.Pow(2, j + 1));}}else if (transverse1)//横{if (j == 0){point1.Y = pFeature.Shape.Envelope.YMin + yValue / 2;point1.X = pFeature.Shape.Envelope.XMin;point2.Y = pFeature.Shape.Envelope.YMin + yValue / 2;point2.X = pFeature.Shape.Envelope.XMax;newValue = pFeature.Shape.Envelope.YMin + yValue / 2;}else if (plusChk){point1.Y = newValue + (yValue / Math.Pow(2, j + 1));point1.X = pFeature.Shape.Envelope.XMin;point2.Y = newValue + (yValue / Math.Pow(2, j + 1));point2.X = pFeature.Shape.Envelope.XMax;newValue = newValue + (yValue / Math.Pow(2, j + 1));}else if (reduceChk){point1.Y = newValue - (yValue / Math.Pow(2, j + 1));point1.X = pFeature.Shape.Envelope.XMin;point2.Y = newValue - (yValue / Math.Pow(2, j + 1));point2.X = pFeature.Shape.Envelope.XMax;newValue = newValue - (yValue / Math.Pow(2, j + 1));}}else if (Mousepointing1)//鼠标指向 有问题{IPolyline lin2 = pline as IPolyline;IPoint point3 = new PointClass();IPoint point4 = new PointClass();if (j == 0){point3.X = (pFeature.Shape.Envelope.XMin + pFeature.Shape.Envelope.XMax) / 2;point3.Y = (pFeature.Shape.Envelope.YMin + pFeature.Shape.Envelope.YMax) / 2;point4.X = lin2.ToPoint.X - (lin2.FromPoint.X - point3.X);point4.Y = lin2.ToPoint.Y - (lin2.FromPoint.Y - point3.Y);newValue = point3.Y;newValue2 = point4.Y;}else if (plusChk){point3.X = (pFeature.Shape.Envelope.XMin + pFeature.Shape.Envelope.XMax) / 2;point3.Y = newValue + (yValue / Math.Pow(2, j + 1));point4.X = lin2.ToPoint.X - (lin2.FromPoint.X - point3.X);point4.Y = newValue2 + (yValue / Math.Pow(2, j + 1));newValue = point3.Y;newValue2 = point4.Y;}else if (reduceChk){point3.X = (pFeature.Shape.Envelope.XMin + pFeature.Shape.Envelope.XMax) / 2;point3.Y = newValue - (yValue / Math.Pow(2, j + 1));point4.X = lin2.ToPoint.X - (lin2.FromPoint.X - point3.X);point4.Y = newValue2 - (yValue / Math.Pow(2, j + 1));newValue = point3.Y;newValue2 = point4.Y;}ILine newline2 = new LineClass();newline2.PutCoords(point3, point4);ISegmentCollection pSegCol2 = new PolylineClass();pSegCol2.AddSegment(newline2 as ISegment);fgx = DataManager.getExtendLine(pSegCol2 as IPolyline, 3, 1000000);}if (fgx == null){newline.PutCoords(point1, point2);ISegmentCollection pSegCol = new PolylineClass();pSegCol.AddSegment(newline as ISegment);fgx = pSegCol as IPolyline;}try{try{topo.Cut((fgx as IPolyline), out pLeftGeometry, out pRightGeometry);//chkcw = false;}catch{//chkcw = true;//newValue = newValue - (yValue / Math.Pow(2, j + 1));//newValue2 = newValue2 - (yValue / Math.Pow(2, j + 1));}left = Math.Round((pLeftGeometry as IArea).Area, 2);right = Math.Round((pRightGeometry as IArea).Area, 2);//oldleft.Add(left);//if(Math.Abs(left- divisionArea))if (Math.Round((left + right), 0) == Math.Round(divisionArea, 0)){fgChk = false;break;}if (Mousepointing1){//if (oldleft.Count > 2)//{//    if (Math.Abs(oldleft[oldleft.Count - 1] - divisionArea) > Math.Abs(oldleft[oldleft.Count - 2] - divisionArea))//    {//        if (chkFX)//            chkFX = false;//        else//            chkFX = true;//    }//    if (oldleft[oldleft.Count - 1] == oldleft[oldleft.Count - 2])//    {//        if (chkFX)//            chkFX = false;//        else//            chkFX = true;//        j = 2;//    }//}//if (left / divisionArea > 2 && (!chkcw))//{//    j = 2;//}//if (left == 0 || right == 0)//{//    if (left == Math.Round(divisionArea, 2) || right == Math.Round(divisionArea, 2))//    {//        fgChk = false;//        break;//    }//    else//    { chkFX = true; }//}}if (transverse1){if (upperChk)//分割上面{if (left == Math.Round(divisionArea, 2)){fgChk = true;break;}else if (left > Math.Round(divisionArea, 2)){reduceChk = false;plusChk = true;}else if (left < Math.Round(divisionArea, 2)){plusChk = false;reduceChk = true;}}else if (lowerChk) //分割下面{if (right == Math.Round(divisionArea, 2)){fgChk = true;break;}else if (right > Math.Round(divisionArea, 2)){plusChk = false;reduceChk = true;}else if (right < Math.Round(divisionArea, 2)){reduceChk = false;plusChk = true;}}}else if (portrait1){if (rightChk)//分割右面{if (right == Math.Round(divisionArea, 2)){fgChk = true;break;}else if (right > Math.Round(divisionArea, 2)){reduceChk = false;plusChk = true;}else if (right < Math.Round(divisionArea, 2)){plusChk = false;reduceChk = true;}}else if (leftChk) //分割左面{if (left == Math.Round(divisionArea, 2)){fgChk = true;break;}else if (left > Math.Round(divisionArea, 2)){plusChk = false;reduceChk = true;}else if (left < Math.Round(divisionArea, 2)){reduceChk = false;plusChk = true;}}}else if (Mousepointing1){if (left == Math.Round(divisionArea, 2)){fgChk = true;break;}else if (left < Math.Round(divisionArea, 2)){plusChk = false;reduceChk = true;}else if (left > Math.Round(divisionArea, 2)){reduceChk = false;plusChk = true;}}}catch { }if (j == 99){MessageBox.Show("图形面积远大于分割面积，无法切割成功!");}}//topo.Cut((pline as IPolyline), out pLeftGeometry, out pRightGeometry);//left = (pLeftGeometry as IArea).Area;//double right = (pRightGeometry as IArea).Area;//MessageBox.Show(left.ToString()+","+right.ToString(),MessageBoxButtons.OKCancel);//DialogResult result=null;// if (pFeature.HasOID)//DialogResult result = MessageBox.Show("图层ID：" + pFeature.get_Value(0).ToString() + "，确定要分割！！！！", "切割面积分别为：" + Math.Round(left, 3).ToString() + "," + Math.Round(right, 3).ToString(), MessageBoxButtons.OKCancel);if (fgChk){//获取字段名List<string> pAllFieldsList = new List<string>();pAllFieldsList = KYKJ.AttributeOperate.AttTableOperate.get_FieldsString(pFeatureLayer.FeatureClass);//由FeatureClass新建FeatureIFeature pFeatureLeft = pFeatureLayer.FeatureClass.CreateFeature();IFeature pFeatureRight = pFeatureLayer.FeatureClass.CreateFeature();//赋值pFeatureLeft.Shape = pLeftGeometry;pFeatureRight.Shape = pRightGeometry;for (int i = 0; i < pAllFieldsList.Count; i++){if (pAllFieldsList[i].ToUpper().Contains("ID") || pAllFieldsList[i].ToUpper().Contains("SHP") || pAllFieldsList[i].ToUpper().Contains("SHAPE_")) continue;int fieldindex = pFeatureLeft.Fields.FindField(pAllFieldsList[i]);string sd = pFeature.Value[fieldindex].ToString();pFeatureLeft.set_Value(fieldindex, pFeature.Value[fieldindex]);pFeatureRight.set_Value(fieldindex, pFeature.Value[fieldindex]);}//保存pFeatureLeft.Store();pFeatureRight.Store();if (transverse1 && tValue > 1){if (upperChk)fsFeature = pFeatureRight;elsefsFeature = pFeatureLeft;}else if (portrait1 && pValue > 1){if (rightChk)fsFeature = pFeatureLeft;elsefsFeature = pFeatureRight;}elsefsFeature = null;//删除pFeature.Delete();}}catch (Exception ex){MessageBox.Show("分割失败,可能该图形为多面体(包含z)!");//string ss = ex.ToString();}// }}if (tValue > 1){pFeature = fsFeature;tValue--;}else if (pValue > 1){pFeature = fsFeature;pValue--;}if (fsFeature == null)pFeature = pEnumFeature.Next();}//清除选择IFeatureSelection pFeatureSelectionClear = axMapControl1.get_Layer(0) as IFeatureSelection;pFeatureSelectionClear.Clear();axMapControl1.Refresh();}}#endregion