1 /// <summary> 2 /// 得到输入点在输入图层上的最近点 3 /// </summary> 4 /// <param name="randomPoints">输入的点，注意小数位数不能太长，具体支持多长没有测试，我用小数点2位可以成功，但是七八位肯定不行</param> 5 /// <param name="feaPoints">输出在featureclass上距离最近的要素，这里是点类型输出的是点</param> 6 /// <param name="length">输入点到featureclass上最近点的距离</param> 7 /// <returns></returns> 8 public bool NearestPoint(IPoint[] randomPoints, out IPoint[] feaPoints, out double length) 9 { 10 feaPoints = new IPoint[randomPoints.Length]; 11 length = 0; 12 try 13 { 14 fd = (LinkReady.ReadPipeLineWorkspace() as IFeatureWorkspace).OpenFeatureDataset(LY.UG.Common.DictionaryConfig.DatasetName["道路网络数据集名称"]);//("SDE.地下管线"); 15 nc = fd as INetworkCollection; 16 IFeatureClass feaRoadJunction = (fd as IFeatureClassContainer).get_ClassByName(LY.UG.Common.DictionaryConfig.DatasetName["道路网络点图层"]); 17 18 int[] feaID = new int[randomPoints.Length]; 19 double[] feaDis = new double[randomPoints.Length]; 20 IFeatureIndex pFeatureIndex = new FeatureIndex(); 21 IIndexQuery pIndexQuery; 22 IGeoDataset geodataset = (IGeoDataset)feaRoadJunction; 23 24 ITrackCancel trackCancel = new TrackCancel(); 25 pFeatureIndex.FeatureClass = feaRoadJunction;//.setFeatureClassByRef(pFeatureClass1); 26 27 pFeatureIndex.Index(trackCancel, geodataset.Extent); 28 pIndexQuery = pFeatureIndex as IIndexQuery; 29 for (int i = 0; i < randomPoints.Length; i++) 30 { 31 pIndexQuery.NearestFeature(randomPoints.GetValue(i) as IPoint, out feaID[i], out feaDis[i]); 32 feaPoints[i] = new PointClass(); 33 feaPoints[i] = feaRoadJunction.GetFeature(feaID[i]).ShapeCopy as IPoint; 34 length = length + feaDis[i]; 35 } 36 37 return true; 38 } 39 catch (Exception ee) 40 { 41 return false; 42 } 43 }