鹰眼的实现

利用2个MapControl控件来实现鹰眼的效果。

其中MapControl1是主图。MapControl2是鹰眼；

        private void axMapControl1_OnExtentUpdated(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnExtentUpdatedEvent e)
        {
            // 得到新范围
            IEnvelope pEnvelope = (IEnvelope)e.newEnvelope;
            IGraphicsContainer pGraphicsContainer = axMapControl2.Map as IGraphicsContainer;

            IActiveView pActiveView = pGraphicsContainer as IActiveView;

            //在绘制前，清除axMapControl2中的任何图形元素
            pGraphicsContainer.DeleteAllElements();
            IRectangleElement pRectangleEle = new RectangleElementClass();
            IElement pElement = pRectangleEle as IElement;
            pElement.Geometry = pEnvelope;
            //设置鹰眼图中的红线框
            IRgbColor pColor = new RgbColorClass();
            pColor.Red = 255;
            pColor.Green = 0;
            pColor.Blue = 0;
            pColor.Transparency = 255;
            //产生一个线符号对象
            ILineSymbol pOutline = new SimpleLineSymbolClass();
            pOutline.Width = 3;
            pOutline.Color = pColor;
            //设置颜色属性
            pColor = new RgbColorClass();
            pColor.Red = 255;
            pColor.Green = 0;
            pColor.Blue = 0;
            pColor.Transparency = 0;
            //设置填充符号的属性
            IFillSymbol pFillSymbol = new SimpleFillSymbolClass();
            pFillSymbol.Color = pColor;
            pFillSymbol.Outline = pOutline;
            IFillShapeElement pFillShapeEle = pElement as IFillShapeElement;
            pFillShapeEle.Symbol = pFillSymbol;
            pGraphicsContainer.AddElement((IElement)pFillShapeEle, 0);
            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);        }

        private void axMapControl1_OnMapReplaced(object sender, IMapControlEvents2_OnMapReplacedEvent e)
        {
            if (axMapControl1.LayerCount > 0)
            {
                axMapControl2.Map = new MapClass();
                for (int i = 0; i <= axMapControl1.Map.LayerCount - 1; i++)
                {
                    axMapControl2.AddLayer(axMapControl1.get_Layer(i));
                }
                axMapControl2.Extent = axMapControl1.Extent;
                axMapControl2.Refresh();
            }

        }

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

        }

        private void axMapControl2_OnMouseDown(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseDownEvent e)
        {
            if (axMapControl2.Map.LayerCount > 0)
            {

//鼠标左边点击时，现有的红框的中心点移动的鼠标点击的位置
                if (e.button == 1)
                {
                    IPoint pPoint = new PointClass();
                    pPoint.PutCoords(e.mapX, e.mapY);
                    axMapControl1.CenterAt(pPoint);
                    axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
                }

//鼠标右边点击并且拖动，将实现一个和拖动一样大小的红框，并且主图显示框中内容；
                else if (e.button == 2)
                {
                    IEnvelope pEnv = axMapControl2.TrackRectangle();
                    axMapControl1.Extent = pEnv;
                    axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
                                     
                }
            }

        }