【ArcGIS二次开发】鹰眼的实现「建议收藏」

大家好，又见面了，我是你们的朋友全栈君。

1、添加程序集

using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.DataSourcesFile;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.DataSourcesRaster;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;

*若出现“命名空间ESRI.ArcGIS中不存在类型或命名空间”的错误

解决方法如下：
右击解决方案中的引用，打开添加引用

选择缺少的程序集，点击确定

2、添加定义声明变量，添加SynchronizeEagleEye方法、DrawRectangle方法、GetRgbColor方法代码

	//定义声明变量
	IEnvelope pEnv;

private void SynchronizeEagleEye()
{ 
   
    if (EagleEyeMapControl.LayerCount > 0)
    { 
   
        EagleEyeMapControl.ClearLayers();
    }
    //设置鹰眼和主地图的坐标系统一致
    EagleEyeMapControl.SpatialReference = mainMapControl.SpatialReference;
    for (int i = mainMapControl.LayerCount - 1; i >= 0; i--)
    { 
   
        //使鹰眼视图与数据视图的图层上下顺序保持一致
        ILayer pLayer = mainMapControl.get_Layer(i);
        if (pLayer is IGroupLayer || pLayer is ICompositeLayer)
        { 
   
            ICompositeLayer pCompositeLayer = (ICompositeLayer)pLayer;
            for (int j = pCompositeLayer.Count - 1; j >= 0; j--)
            { 
   
                ILayer pSubLayer = pCompositeLayer.get_Layer(j);
                IFeatureLayer pFeatureLayer = pSubLayer as IFeatureLayer;
                if (pFeatureLayer != null)
                { 
   
                    //由于鹰眼地图较小，所以过滤点图层不添加
                    if (pFeatureLayer.FeatureClass.ShapeType != esriGeometryType.esriGeometryPoint
                        && pFeatureLayer.FeatureClass.ShapeType != esriGeometryType.esriGeometryMultipoint)
                    { 
   
                        EagleEyeMapControl.AddLayer(pLayer);
                    }
                }
            }
        }
        else
        { 
   
            IFeatureLayer pFeatureLayer = pLayer as IFeatureLayer;
            if (pFeatureLayer != null)
            { 
   
                if (pFeatureLayer.FeatureClass.ShapeType != esriGeometryType.esriGeometryPoint
                    && pFeatureLayer.FeatureClass.ShapeType != esriGeometryType.esriGeometryMultipoint)
                { 
   
                    EagleEyeMapControl.AddLayer(pLayer);
                }
            }
        }
        //设置鹰眼地图全图显示 
        EagleEyeMapControl.Extent = mainMapControl.FullExtent;
        pEnv = mainMapControl.Extent as IEnvelope;
        DrawRectangle(pEnv);
        EagleEyeMapControl.ActiveView.Refresh();
    }
}

//在鹰眼地图上面画矩形框
private void DrawRectangle(IEnvelope pEnvelope)
{ 
   
    //在绘制前，清除鹰眼中之前绘制的矩形框
    IGraphicsContainer pGraphicsContainer = EagleEyeMapControl.Map as IGraphicsContainer;
    IActiveView pActiveView = pGraphicsContainer as IActiveView;
    pGraphicsContainer.DeleteAllElements();
    //得到当前视图范围
    IRectangleElement pRectangleElement = new RectangleElementClass();
    IElement pElement = pRectangleElement as IElement;
    pElement.Geometry = pEnvelope;
    //设置矩形框（实质为中间透明度面）
    IRgbColor pColor = new RgbColorClass();
    pColor = GetRgbColor(255, 0, 0);
    pColor.Transparency = 255;
    ILineSymbol pOutLine = new SimpleLineSymbolClass();
    pOutLine.Width = 2;
    pOutLine.Color = pColor;

    IFillSymbol pFillSymbol = new SimpleFillSymbolClass();
    pColor = new RgbColorClass();
    pColor.Transparency = 0;
    pFillSymbol.Color = pColor;
    pFillSymbol.Outline = pOutLine;
    //向鹰眼中添加矩形框
    IFillShapeElement pFillShapeElement = pElement as IFillShapeElement;
    pFillShapeElement.Symbol = pFillSymbol;
    pGraphicsContainer.AddElement((IElement)pFillShapeElement, 0);
    //刷新
    pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
}

//定义用于获取颜色的GetRgbColor方法
private IRgbColor GetRgbColor(int intR, int intG, int intB)
{ 
   
    IRgbColor pRgbColor = null;
    if (intR < 0 || intR > 255 || intG < 0 || intG > 255 || intB < 0 || intB > 255)
    { 
   
        return pRgbColor;
    }
    pRgbColor = new RgbColorClass();
    pRgbColor.Red = intR;
    pRgbColor.Green = intG;
    pRgbColor.Blue = intB;
    return pRgbColor;
}

*出现“无法嵌入互操作类型”的错误

解决方法如下：
修改相应程序集的“嵌入互操作类型”属性值，将原来的True改为False

3、设置MainMapControl控件的OnMapReplaced属性的功能，在OnMapReplaced中添加SynchronizeEagleEye方法

private void MainMapControl_OnMapReplaced(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMapReplacedEvent e)
        { 
   
            SynchronizeEagleEye();
        }

4、设置MainMapControl控件的OnExtentUpdated属性的功能，在OnExtentUpdated中添加DrawRectangle方法

private void MainMapControl_OnExtentUpdated(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnExtentUpdatedEvent e)
        { 
   
            //得到当前视图范围
            pEnv = (IEnvelope)e.newEnvelope;
            DrawRectangle(pEnv);
        }

5、设置EagleEyeMapControl控件的OnMouseDown属性的功能，添加OnMouseDown的左键和右键功能代码

	//定义声明变量
	IPoint pMoveRectPoint;
	bool bCanDrag;

private void EagleEyeMapControl_OnMouseDown(object sender, IMapControlEvents2_OnMouseDownEvent e)
{ 
   
    if (EagleEyeMapControl.Map.LayerCount > 0)
    { 
   
        //按下鼠标左键移动矩形框
        if (e.button == 1)
        { 
   
            //如果指针落在鹰眼的矩形框中，标记可移动
            if (e.mapX > pEnv.XMin && e.mapY > pEnv.YMin && e.mapX < pEnv.XMax && e.mapY < pEnv.YMax)
            { 
   
                bCanDrag = true;
            }
            pMoveRectPoint = new PointClass();
            pMoveRectPoint.PutCoords(e.mapX, e.mapY);  //记录点击的第一个点的坐标
        }
        //按下鼠标右键绘制矩形框
        else if (e.button == 2)
        { 
   
            IEnvelope pEnvelope = EagleEyeMapControl.TrackRectangle();

            IPoint pTempPoint = new PointClass();
            pTempPoint.PutCoords(pEnvelope.XMin + pEnvelope.Width / 2, pEnvelope.YMin + pEnvelope.Height / 2);
            mainMapControl.Extent = pEnvelope;
            //矩形框的高宽和数据试图的高宽不一定成正比，这里做一个中心调整
            mainMapControl.CenterAt(pTempPoint);
        }
    }
}

6、设置EagleEyeMapControl控件的OnMouseMove属性的功能，添加OnMouseMove改变鼠标样式的功能代码

private void EagleEyeMapControl_OnMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e)
{ 
   
    if (e.mapX > pEnv.XMin && e.mapY > pEnv.YMin && e.mapX < pEnv.XMax && e.mapY < pEnv.YMax)
    { 
   
        //如果鼠标移动到矩形框中，鼠标换成小手，表示可以拖动
        EagleEyeMapControl.MousePointer = esriControlsMousePointer.esriPointerHand;
        if (e.button == 2)  //如果在内部按下鼠标右键，将鼠标演示设置为默认样式
        { 
   
            EagleEyeMapControl.MousePointer = esriControlsMousePointer.esriPointerDefault;
        }
    }
    else
    { 
   
        //在其他位置将鼠标设为默认的样式
        EagleEyeMapControl.MousePointer = esriControlsMousePointer.esriPointerDefault;
    }

    if (bCanDrag)
    { 
   
        double Dx, Dy;  //记录鼠标移动的距离
        Dx = e.mapX - pMoveRectPoint.X;
        Dy = e.mapY - pMoveRectPoint.Y;
        pEnv.Offset(Dx, Dy); //根据偏移量更改 pEnv 位置
        pMoveRectPoint.PutCoords(e.mapX, e.mapY);
        DrawRectangle(pEnv);
        mainMapControl.Extent = pEnv;
    }
}

7、设置EagleEyeMapControl控件的OnMouseUp属性的功能，添加OnMouseUp范围变化的功能代码

private void EagleEyeMapControl_OnMouseUp(object sender, IMapControlEvents2_OnMouseUpEvent e)
{ 
   
    if (e.button == 1 && pMoveRectPoint != null)
    { 
   
        if (e.mapX == pMoveRectPoint.X && e.mapY == pMoveRectPoint.Y)
        { 
   
            mainMapControl.CenterAt(pMoveRectPoint);
        }
        bCanDrag = false;
    }
}

8、设置MainMapControl控件的OnAfterScreenDraw属性的功能，添加OnAfterScreenDraw的功能代码及CopyToPageLayout代码

private void CopyToPageLayout()
{ 
   
    IObjectCopy pObjectCopy = new ObjectCopyClass();
    object copyFromMap = mainMapControl.Map;
    object copiedMap = pObjectCopy.Copy(copyFromMap);//复制地图到copiedMap中
    object copyToMap = axPageLayoutControl1.ActiveView.FocusMap;
    pObjectCopy.Overwrite(copiedMap, ref copyToMap); //复制地图
    axPageLayoutControl1.ActiveView.Refresh();
}

private void mainMapControl_OnAfterScreenDraw(object sender, IMapControlEvents2_OnAfterScreenDrawEvent e)
{ 
   
    IActiveView pActiveView = (IActiveView)axPageLayoutControl1.ActiveView.FocusMap;
    IDisplayTransformation displayTransformation = pActiveView.ScreenDisplay.DisplayTransformation;
    displayTransformation.VisibleBounds = mainMapControl.Extent;
    axPageLayoutControl1.ActiveView.Refresh();
    CopyToPageLayout();
}