1 using ESRI.ArcGIS.Carto;
  2 using ESRI.ArcGIS.Geodatabase;
  3 using ESRI.ArcGIS.Geometry;
  4 using System;
  5 using System.Collections.Generic;
  6 using System.ComponentModel;
  7 using System.Data;
  8 using System.Drawing;
  9 using System.Linq;
 10 using System.Text;
 11 using System.Windows.Forms;
 12 
 13 namespace MovePointToLine
 14 {
 15     public partial class FrmMain1 : DevExpress.XtraEditors.XtraForm
 16     {
 17         public FrmMain1()
 18         {
 19             InitializeComponent();
 20         }
 21 
 22         private IFeatureLayer pointFlayer;
 23         private IFeatureLayer LineFlayer;
 24         //初始化图层列表
 25         private void cmbSelectLineLayer_MouseClick(object sender, MouseEventArgs e)
 26         {
 27             DevExpress.XtraEditors.ComboBoxEdit c = sender as DevExpress.XtraEditors.ComboBoxEdit;
 28             c.Properties.Items.Clear();
 29 
 30             IMap map = axMapControl1.Map;
 31             if (map != null)
 32             {
 33                 for (int i = 0; i < map.LayerCount; i++)
 34                 {
 35                     c.Properties.Items.Add(map.get_Layer(i).Name);
 36                 }
 37             }
 38         }
 39         private void cmbSelectPointLayer_MouseClick(object sender, MouseEventArgs e)
 40         {
 41             DevExpress.XtraEditors.ComboBoxEdit c = sender as DevExpress.XtraEditors.ComboBoxEdit;
 42             c.Properties.Items.Clear();
 43 
 44             IMap map = axMapControl1.Map;
 45             if (map != null)
 46             {
 47                 for (int i = 0; i < map.LayerCount; i++)
 48                 {
 49                     c.Properties.Items.Add(map.get_Layer(i).Name);
 50                 }
 51             }
 52         }
 53         //获取线图层
 54         private void cmbSelectLineLayer_SelectedIndexChanged(object sender, EventArgs e)
 55         {
 56             try
 57             {
 58                 ILayer layer = getLayerFromName(cmbSelectLineLayer.SelectedItem.ToString());
 59                 LineFlayer = layer as IFeatureLayer;
 60             }
 61             catch (Exception ex)
 62             {
 63                 MessageBox.Show(ex.Message);
 64             }
 65         }
 66         //获取点图层
 67         private void cmbSelectPointLayer_SelectedIndexChanged(object sender, EventArgs e)
 68         {
 69             ILayer layer = getLayerFromName(cmbSelectPointLayer.SelectedItem.ToString());
 70             pointFlayer = layer as IFeatureLayer;
 71         }
 72 
 73         private void Run_Click(object sender, EventArgs e)
 74         {
 75             splashScreenManager1.ShowWaitForm();
 76             try
 77             {
 78                 //查询缓冲区图层
 79                 IFeatureLayer ptLayer = pointFlayer;
 80                 //得到指定图层上距point最近的feature上的最近点
 81                 IFeatureClass ptFeatClass = ptLayer.FeatureClass;
 82                 IFeatureCursor featureCursor = featureCursor = ptFeatClass.Search(null, false);
 83                 IFeature feature = featureCursor.NextFeature();
 84                 IPoint point = new PointClass();
 85                 while (feature != null)
 86                 {
 87                     point = feature.Shape as IPoint;
 88                     //查找离点最近的线
 89                     IFeature nearFea = GetNearestFeature(point);
 90                     IPoint neaPoint = GetNearestPoint(point, nearFea);
 91                     neaPoint.Z = point.Z;
 92                     //移动点
 93                     MoveToNeaPoint(feature, point, neaPoint);
 94                     if (featureCursor == null || feature == null)
 95                     {
 96                         return;
 97                     }
 98                     feature = featureCursor.NextFeature();
 99                 }
100                 axMapControl1.Refresh();
101 
102                 memoEdit1.Text = memoEdit1.Text + "\r\n" + "恭喜你，执行成功！";
103                 memoEdit1.SelectionStart = memoEdit1.Text.Length;
104                 memoEdit1.ScrollToCaret();
105             }
106             catch (Exception ex)
107             {
108                 memoEdit1.Text = memoEdit1.Text + "\r\n" + "处理失败，请检查！" + "\r\n" + ex.Message;
109                 memoEdit1.SelectionStart = memoEdit1.Text.Length;
110                 memoEdit1.ScrollToCaret();
111             }
112             splashScreenManager1.CloseWaitForm();
113         }
114 
115         //查找最近的线
116         public IFeature GetNearestFeature(IPoint p)
117         {
118             IFeature nearFea;
119             IProximityOperator Proximity = (IProximityOperator)p;
120             IFeatureLayer FeaLyr = LineFlayer;
121             IFeatureClass FeaCls = FeaLyr.FeatureClass;
122             IQueryFilter queryFilter = null;
123             IFeatureCursor FeaCur = FeaCls.Search(queryFilter, false);
124             IFeature Fea = nearFea = FeaCur.NextFeature();
125             double minDistince, Distance;
126             if (Fea == null)
127                 return null;
128             minDistince = Distance = Proximity.ReturnDistance((IGeometry)Fea.Shape);    //最近的距离值
129             //保存距离最近的feature
130             Fea = FeaCur.NextFeature();
131             while (Fea != null)
132             {
133                 Distance = Proximity.ReturnDistance((IGeometry)Fea.Shape);
134                 if (Distance < minDistince)
135                 {
136                     minDistince = Distance;
137                     nearFea = Fea;
138                 }
139                 Fea = FeaCur.NextFeature();
140             }   //end while
141             return nearFea;
142         }
143 
144         //point最近的feature上的最近点
145         public IPoint GetNearestPoint(IPoint point, IFeature nearFea)
146         {
147             IProximityOperator Proximity = (IProximityOperator)point;
148             IFeatureLayer FeaLyr = LineFlayer;
149             IFeatureClass FeaCls = FeaLyr.FeatureClass;
150             IQueryFilter queryFilter = null;
151             ITopologicalOperator topoOper = (ITopologicalOperator)point;
152             IGeometry geo = topoOper.Buffer(1.2);
153             ISpatialFilter sf = new SpatialFilterClass();
154             sf.Geometry = geo;
155             sf.GeometryField = FeaCls.ShapeFieldName;
156             sf.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses;
157             IFeatureCursor FeaCur = FeaCls.Search(queryFilter, false);
158             IFeature Fea = nearFea = FeaCur.NextFeature();
159             double minDistince, Distance;
160             if (Fea == null)
161                 return null;
162             minDistince = Distance = Proximity.ReturnDistance((IGeometry)Fea.Shape);    //最近的距离值
163             //保存距离最近的feature
164             Fea = FeaCur.NextFeature();
165             while (Fea != null)
166             {
167                 Distance = Proximity.ReturnDistance((IGeometry)Fea.Shape);
168                 if (Distance < minDistince)
169                 {
170                     minDistince = Distance;
171                     nearFea = Fea;
172                 }
173                 Fea = FeaCur.NextFeature();
174             }   //end while
175             Proximity = (IProximityOperator)nearFea.Shape;
176             return Proximity.ReturnNearestPoint(point, esriSegmentExtension.esriNoExtension);
177 
178         }
179         /// <summary>
180         /// 移动点
181         /// </summary>
182         /// <param name="feature"></param>
183         /// <param name="point"></param>
184         /// <param name="neaPoint"></param>
185         private void MoveToNeaPoint(IFeature feature, IPoint point, IPoint neaPoint)
186         {
187             IPoint geomType = new PointClass();
188             feature.Shape = neaPoint as IGeometry;
189             feature.Store();
190         }
191 
192         /// <summary>
193         /// 通过图层名得到图层
194         /// </summary>
195         /// <param name="layerName"></param>
196         /// <returns></returns>
197         private ILayer getLayerFromName(string layerName)
198         {
199             ILayer layer;
200             IMap map = axMapControl1.Map;
201             for (int i = 0; i < map.LayerCount; i++)
202             {
203                 layer = map.get_Layer(i);
204                 if (layerName == layer.Name)
205                     return layer;
206             }
207             return null;
208         }
209 
210     }
211 }