步骤
1,首先在含有主视图控件 ESRI.ArcGIS.Controls.AxMapControl mapCtrl_main 的主类中定义一个 IEnvelope 成员变量,用于记录鼠标在主视图控件画好的轮廓
1 private ESRI.ArcGIS.Geometry.IEnvelope mainInvelope = null; //(主视图上)
2 public ESRI.ArcGIS.Geometry.IEnvelope MainInvelopeValue {
3 get {
4 return mainInvelope;
5 }
6 }
并设置成外界可访问的属性.
2,在该类中定义一bool变量,以控制查询
1 private bool startMainInvelope = false; //标识在主视图上画轮廓矩形,以进行该范围内点查询.
3,在 mapCtrl_main 的 OnMouseDown 响应事件中,控制轮廓的顺畅画好
1 if (1 == e.button && startMainInvelope) { //在主视图上画轮廓.
2 mainInvelope = mapCtrl_main.TrackRectangle();
3 try {
4 if (!mainInvelope.IsEmpty)
5 Engine.App_Code.Draw.DrawSymbol(mapCtrl_main.Map, mainInvelope);
6 }
7 catch (System.Exception ex) {
8 MessageBox.Show(ex.Message);
9 }
10 }
其中用到画轮廓的辅助方法定义为:
1 /// <summary>
2 /// 画轮廓.
3 /// </summary>
4 /// <param name="sender"></param>
5 /// <param name="e">根据IEnvelope对象画轮廓.</param>
6 public static void DrawSymbol(ESRI.ArcGIS.Carto.IMap map, ESRI.ArcGIS.Geometry.IEnvelope e) {
7 ESRI.ArcGIS.Carto.IGraphicsContainer hawkGC = (ESRI.ArcGIS.Carto.IGraphicsContainer)map;
8 ESRI.ArcGIS.Carto.IActiveView aView = (ESRI.ArcGIS.Carto.IActiveView)hawkGC;
9 hawkGC.DeleteAllElements();
10
11 ESRI.ArcGIS.Carto.IElement recEle = (ESRI.ArcGIS.Carto.IElement)new ESRI.ArcGIS.Carto.RectangleElementClass();
12 recEle.Geometry = e;
13 ESRI.ArcGIS.Display.ISimpleLineSymbol outLine = new ESRI.ArcGIS.Display.SimpleLineSymbolClass();
14 outLine.Color = ColorPaint(255, 255);
15 outLine.Width = 2;
16
17 //填充样式.
18 ESRI.ArcGIS.Display.ISimpleFillSymbol fillSym = new ESRI.ArcGIS.Display.SimpleFillSymbolClass();
19 fillSym.Color = ColorPaint(255, 0);
20 fillSym.Outline = outLine;
21
22 ESRI.ArcGIS.Carto.IFillShapeElement fillShape = (ESRI.ArcGIS.Carto.IFillShapeElement)recEle;
23 fillShape.Symbol = fillSym;
24 hawkGC.AddElement((ESRI.ArcGIS.Carto.IElement)fillShape, 0);
25 aView.PartialRefresh(ESRI.ArcGIS.Carto.esriViewDrawPhase.esriViewGraphics, null, null);
26 }
4,在查询窗口中,用 GetLayerByName 方法定位好待查询的点要素图层(方法定义为)
1 /// <summary>
2 /// 根据图层名获取图层.
3 /// </summary>
4 /// <param name="map"></param>
5 /// <param name="layerName">图层名称.</param>
6 /// <returns></returns>
7 public static ESRI.ArcGIS.Carto.ILayer GetLayerByName(ESRI.ArcGIS.Carto.IMap map, string layerName) {
8 ESRI.ArcGIS.Carto.IEnumLayer enunLayer = map.get_Layers(null, false);
9 enunLayer.Reset();
10 ESRI.ArcGIS.Carto.ILayer resultLayer = null;
11 while ((resultLayer = enunLayer.Next()) != null) {
12 if (resultLayer.Name.Equals(layerName)) {
13 break;
14 }
15 }
16 return resultLayer;
17 }
5,查询窗口实现查询的所有代码:
1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Data;
5 using System.Drawing;
6 using System.Linq;
7 using System.Text;
8 using System.Windows.Forms;
9
10 namespace Engine {
11 public partial class fQueryInvelopePoints : Form {
12 private ESRI.ArcGIS.Carto.IMap map = null;
13 private fMain fMain = null;
14 public fQueryInvelopePoints(fMain fMain, ESRI.ArcGIS.Carto.IMap map) {
15 this.fMain = fMain;
16 this.map = map;
17 InitializeComponent();
18 }
19
20 /// <summary>
21 /// 查询指定矩形范围内的点要素.
22 /// </summary>
23 /// <param name="envelope">指定的矩形范围.</param>
24 /// <param name="featureClass">待查询的要素.</param>
25 /// <returns>返回结果的游标</returns>
26 public ESRI.ArcGIS.Geodatabase.IFeatureCursor GetAllFeaturesFromPointSearchInGeoFeatureLayer(ESRI.ArcGIS.Geometry.IEnvelope envelope, ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass) {
27 if (featureClass == null)
28 return null;
29 ESRI.ArcGIS.Geodatabase.ISpatialFilter spatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilterClass();
30 spatialFilter.Geometry = envelope;
31 spatialFilter.SpatialRel = ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelEnvelopeIntersects;
32 spatialFilter.GeometryField = featureClass.ShapeFieldName;
33 return featureClass.Search(spatialFilter, false);
34 }
35
36 private void fQueryInvelopePoints_Load(object sender, EventArgs e) {
37 Engine.App_Code.Layer_Assist.InitLayers(map, cbox_layer);
38 }
39
40 private void btn_query_Click(object sender, EventArgs e) {
41 lsbox.Items.Clear(); //清空原始数据.
42 ESRI.ArcGIS.Carto.ILayer lyr = Engine.App_Code.Layer_Assist.GetLayerByName(map, cbox_layer.Text);
43 if (lyr is ESRI.ArcGIS.Carto.IFeatureLayer) { //矢量数据.
44 ESRI.ArcGIS.Carto.IFeatureLayer fLyr = (ESRI.ArcGIS.Carto.IFeatureLayer)lyr;
45 ESRI.ArcGIS.Geometry.IEnvelope selEnvelope = fMain.MainInvelopeValue;
46 //获取矩形范围内的要素.
47 ESRI.ArcGIS.Geodatabase.IFeatureCursor fCur = GetAllFeaturesFromPointSearchInGeoFeatureLayer(selEnvelope, fLyr.FeatureClass);
48 ESRI.ArcGIS.Geodatabase.IFeatureClass fc = fLyr.FeatureClass;
49 ESRI.ArcGIS.Geodatabase.IFeature f = null;
50 string v = "";
51 string k = "";
52 k = "name";
53 fMain.mapCtrl_main.ActiveView.Refresh(); //高亮显示前.
54 try {
55 while ((f = fCur.NextFeature()) != null) {
56 map.SelectFeature(fLyr, f); //高亮显示.
57 v = Convert.ToString(f.get_Value(f.Fields.FindField("name")));
58 lsbox.Items.Add(k + " : " + v);
59 }
60 }
61 catch (System.Exception ex) {
62 MessageBox.Show(ex.Message + "不支持查询的图层或查询字段错误:NAME");
63 }
64 fMain.mapCtrl_main.ActiveView.Refresh(); //高亮显示后.
65 }
66 }
67 }
68 }
6,运行时,画好矩形轮廓后,在主视图控件类中调用即可:
1 if (mainInvelope == null || mainInvelope.IsEmpty) {
2 MessageBox.Show("画轮廓为空");
3 return;
4 }
5 if (fInvelopePoints == null)
6 fInvelopePoints = new fQueryInvelopePoints(this, mapCtrl_main.Map);
7 fInvelopePoints.FormClosed += (s, ea) => {
8 fInvelopePoints = null;
9 };
10 fInvelopePoints.Show(this);
其中 fInvelopePoints 为定义在主视图类中的查询窗口的成员变量:
1 //查询窗口. 2 private fQueryInvelopePoints fInvelopePoints = null;
附
在主视图中画矩形轮廓如图:
查询后,弹出查询结果如图:
时间： 2024-10-03 14:45:25