arcGIS—实现鹰眼功能

  

鹰眼窗口实现的基本思路：

（1）在布局空间控件需要两个MapControl控件，一个作为主视图，一个作为鹰眼视图；

（2）在主视图和鹰眼视图两个视图控件中显示数据应该一致。

（3）在主视图当中当前显示的地图范围，需要用红色矩形框在鹰眼视图中标会出来。当主视图显示的地图范围发生变化时，鹰眼图中红色框的位子也要发生变化。

（4）当用户鼠标在鹰眼视图中移动或者改变红色框大小或者位子时候，主视图的地图范围也要相应的发生变化。

其中涉及几个事件，具体代码如下：

 

private void button1_Click(object sender, EventArgs e)
        {
            loadMapDocument();
        }
        private void loadMapDocument()
        {
            System.Windows.Forms.OpenFileDialog openFileDialog;
            openFileDialog = new OpenFileDialog();
            openFileDialog.Title = "打开地图文档";
            openFileDialog.Filter = "map documents(*.mxd)|*.mxd";
            openFileDialog.ShowDialog();
            string filePath = openFileDialog.FileName;
            if (axMapControl1.CheckMxFile(filePath))
            {
                axMapControl1.MousePointer = esriControlsMousePointer.esriPointerArrowHourglass;
                axMapControl1.LoadMxFile(filePath);
                axMapControl1.MousePointer = esriControlsMousePointer.esriPointerDefault;
            }
            else
            {
                MessageBox.Show(filePath + "不是有效文档");
            }
        }

        private void axMapControl1_OnMapReplaced(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMapReplacedEvent e)
        {
            onMapReplace();
        }
        private void onMapReplace()
        {
            IMap pMap = axMapControl1.Map;
            for (int i = 0; i < pMap.LayerCount; ++i)
            {
                axMapControl2.AddLayer(pMap .get_Layer (i));
            }
            axMapControl2.Extent = axMapControl2.FullExtent;
        }

        private void axMapControl2_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
        {
            if (e.button == 1)
            {
                IPoint pPoint = new PointClass();
                pPoint.X = e.mapX;
                pPoint.Y = e.mapY;
                IEnvelope pEnvelope = axMapControl1.Extent as IEnvelope;
                pEnvelope.CenterAt(pPoint);
                axMapControl1.Extent = pEnvelope;
                axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);

            }
            else if (e.button ==2)
            {
                IEnvelope pEnvelop = axMapControl2.TrackRectangle();
                axMapControl1.Extent = pEnvelop;
                axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
            }
        }

        private void axMapControl2_OnMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e)
        {
            if (e.button != 1)
            return;
            IPoint pPoint = new PointClass();
            pPoint.X = e.mapX;
            pPoint.Y = e.mapY;
            axMapControl1.CenterAt(pPoint);
            axMapControl2.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
        }

        private void axMapControl1_OnExtentUpdated(object sender, IMapControlEvents2_OnExtentUpdatedEvent e)
        {
            IGraphicsContainer pGraphicsContainer = axMapControl2.Map as IGraphicsContainer;
            IActiveView pActiveVie = pGraphicsContainer as IActiveView;
            pGraphicsContainer.DeleteAllElements();
            IRectangleElement pRecElement = new RectangleElementClass();
            IElement pEle = pRecElement as IElement;
            IEnvelope pEnv;
            pEnv = e.newEnvelope as IEnvelope;
            pEle.Geometry = pEnv;
            IRgbColor pColor = new RgbColorClass();
            pColor.Red = 200;
            pColor.Blue = 200;
            pColor.Green = 0;
            pColor.Transparency = 255;
            ILineSymbol pLineSymbol = new SimpleLineSymbolClass();
            pLineSymbol.Width = 2;
            pLineSymbol.Color = pColor;
            IFillSymbol pFillSymbol = new SimpleFillSymbolClass();
            pColor.Transparency = 0;
            pFillSymbol.Color = pColor;
            pFillSymbol.Outline = pLineSymbol;
            IFillShapeElement pFillShapeElement = pRecElement as IFillShapeElement;
            pFillShapeElement.Symbol = pFillSymbol;

            pGraphicsContainer.AddElement(pEle, 0);
            axMapControl2.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
        }