利用IIdentify接口实现点选和矩形…

来源：互联网发布：jsp订餐系统源码编辑：程序博客网时间：2024/06/08 06:20

IIdentify接口定义了获得要素图层单个要素的属性的捷径方法。它有一个Identify方法，返回一个IArray数组对象。
将下列代码放入MouseDown事件中，可以实现点选或者矩形选择要素。
1 IMap pMap;
2 IPoint pPoint;
3 pMap = axMapControl1.Map;

4 pPoint = axMapControl1.ToMapPoint(e.x,e.y);
5
6 IIdentifypIdentify;
7 pIdentify = (IIdentify)pMap.get_Layer(0);
8
9 IArray pIDArray;
10 IFeatureIdentifyObj pFeatIdObj;
11 IIdentifyObj pIdObj;
12 //点选
13 IEnvelope pEnv=new EnvelopeClass();
14 pEnv =axMapControl1.ActiveView.Extent;
15 pEnv.Height= 100;
16 pEnv.Width = 100;
17 pEnv.CenterAt(pPoint);
18 pIDArray = pIdentify.Identify(pEnv);
19 //矩形选择
20 //IEnvelope testIRectangleElement;
21 //testIRectangleElement =axMapControl1.TrackRectangle();
22 //pIDArray =pIdentify.Identify(testIRectangleElement);
23 //i = pIDArray.Count;
24 if (pIDArray != null)
25 {
26 for (int i = 0; i <= pIDArray.Count; i++)
27 {
28 pFeatIdObj =(IFeatureIdentifyObj)pIDArray.get_Element(i);
29 pIdObj = (IIdentifyObj)pFeatIdObj;
30pIdObj.Flash(axMapControl1.ActiveView.ScreenDisplay);
31 //消息显示查询目标的信息
32 MessageBox.Show("Layer:" + pIdObj.Layer.Name + "Feature:" +pIdObj.Name);
33 }
34 }
35 else
36 {
37 MessageBox.Show("No feature identified.");
38 }
39
40 }