【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();
}

9、鹰眼成果展示
鼠标移动鹰眼视图内变成手指样式；可在鹰眼视图内左键拖动矩形框、右键画矩形框来改变显示区域