ArcGIS Engine 中的绘制与编辑

1、线段绘制

基本步骤

构建形状

1. 创建 IPoint
IPoint m_Point = new PointClass();
m_Point.PutCoords(x, y);

2. 创建 IPointCollection
IPointCollection m_PointCollection = new PolylineClass();
m_PointCollection.AddPoint(m_Point, ref Type.Missing, ref Type.Missing);

3. 创建 IPolyline
IPolyline m_Polyline = new PolylineClass();
m_Polyline = m_PointCollection as IPolyline;

4. 创建 IElement
// Element 不能实例化，需要用其派生类实例化
IElement m_Element = m_SimpleLineSymbol as IElement;
m_Element.Geometry = m_Polyline;

设置形状样式
1. 创建 ISimpleLineSymbol
ISimpleLineSymbol m_SimpleLineSymbol = new SimpleLineSymbolClass();

2. 创建 ILineElement
ILineElement m_LineElement = new LineElementClass();
m_LineElement.Symbol = m_SimpleLineSymbol;

加载到地图
IMap m_Map = axMapControl1.Map;
IActiveView m_ActiveView = m_Map as IActiveView;
IGraphicsContainer m_Container = m_Map as IGraphicsContainer;

m_Container.AddElement(m_Element, 0);

m_Active.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);

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其他方法

private void DrawLine()
{
    ILineElement pLineElement;
    IElement pLElement;  

    IPolyline pLine;  

    RgbColor pColor = new RgbColor();
    pColor.Red = ;
    pColor.Green = ;
    pColor.Blue = ;  

    ISimpleLineSymbol pSimpleLineSymbol = new SimpleLineSymbolClass();
    pSimpleLineSymbol.Color = pColor;
    pSimpleLineSymbol.Width = ;  

    pLineElement = new LineElementClass();
    pLineElement.Symbol = pSimpleLineSymbol;  

    pLElement = pLineElement as IElement;  

    IRubberBand pRubberBand;
    pRubberBand = new RubberLineClass();
    pLine = pRubberBand.TrackNew(axMapControl1.ActiveView.ScreenDisplay, null) as IPolyline;  

    pLElement.Geometry = pLine;  

    IGraphicsContainer pGraphicsContainer;
    pGraphicsContainer = axMapControl1.ActiveView as IGraphicsContainer; //把地图的当前view作为图片的容器  

    pGraphicsContainer.AddElement(pLElement, );//把刚刚的element转到容器上
    axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
}  

2、编辑

点编辑：

IPoint pt;
pt = axMapControl1.ToMapPoint(e.x, e.y);
IMarkerElement pMarkerElement;
pMarkerElement = new MarkerElementClass();
IElement pElement;
pElement = pMarkerElement as IElement;
pElement.Geometry = pt;
pGraphicsContainer = pMap as IGraphicsContainer;
pGraphicsContainer.AddElement((IElement)pMarkerElement, );
pActiveView.Refresh(); 

线编辑：

IGeometry polyline;
polyline = axMapControl1.TrackLine();
ILineElement pLineElement;
pLineElement = new LineElementClass();
IElement pElement;
pElement = pLineElement as IElement;
pElement.Geometry = polyline;
pGraphicsContainer = pMap as IGraphicsContainer;
pGraphicsContainer.AddElement((IElement)pLineElement, 0);
pActiveView.Refresh();

面编辑：

IGeometry Polygon;
Polygon = axMapControl1.TrackPolygon();
IPolygonElement PolygonElement;
PolygonElement = new PolygonElementClass();
IElement pElement;
pElement = PolygonElement as IElement;
pElement.Geometry = Polygon;
pGraphicsContainer = pMap as IGraphicsContainer;
pGraphicsContainer.AddElement((IElement)PolygonElement, 0);
pActiveView.Refresh();

ArcEngine中画shape点的另一种方法

public override void OnMouseDown(int Button, int Shift, int X, int Y)
{  

    //base.OnMouseDown(Button, Shift, X, Y);
    IFeatureLayer pFeatureLayer = mapControl.Map.get_Layer() as IFeatureLayer;
    IFeatureClass fc = pFeatureLayer.FeatureClass;
    IFeatureClassWrite fr = fc as IFeatureClassWrite;
    IWorkspaceEdit pWorkspaceEdit = (fc as IDataset).Workspace as IWorkspaceEdit;  

    IFeature pFeature;
    IPoint pPoint;
    //开始事物操作
    pWorkspaceEdit.StartEditing(false);  

    //开始编辑
    pWorkspaceEdit.StartEditOperation();  

    pFeature = fc.CreateFeature();
    pPoint = new PointClass();
    IPoint Mp = mapControl.ToMapPoint(X, Y);
    pPoint.PutCoords(Mp.X, Mp.Y);
    pPoint.SpatialReference = mapControl.SpatialReference;
    pFeature.Shape = pPoint;
    pFeature.Store();
    mapControl.ActiveView.Refresh();
    if (Button == )
    {
        pWorkspaceEdit.StopEditOperation();
        pWorkspaceEdit.StopEditing(true);
    }
}  

3、绘制Element、Symbol 在控件上

做符号预览的时候需要将ISymbol或IElement绘制到指定的控件上，下面边码边说，一起讨论讨论：

3.1 绘制在Panel上

ISymbol接口有Draw函数，查询其接口可以发现，我们需要执行ISymbol.SetupDC -> ISymbol.Draw -> ISymbol.ResetDC 这三个步骤；

首先SetupDC需要参数 hDC和IDisplayTransformation;贴代码：

例如：绘制在Panel上：

int width=Panel.Width;
int heigth=Panel.Heigth;
//绘制方法
Graphics graph=Graphics.FromHwnd(Panel.Handle);
graph.Clear(Panel.BackColor);
//分辨率
double dpi=graph.DpiX;
IEnvelope pEnve=new EnvelopeClass();
pEnve.PutCoords(,,width,heigth);
Ipoint pCenterPt=new PointClass;
pCenter.PutCoords(width/,height/);

tagRECT myRect=new tagRECT();
设置MyRect 的 top=；bottom=heigh; left=,right=width;

IDisplayransformation pDisTrans=new  DisplayTrabsformation();
pDisTrans.VisiableBounds=pEnve;
pDisTrans.Bounds=pEnv;
pDisTrans.Set_DeviceFrame(ref myRect);
pDisTrans.Resolution=dpi;

intPtr hdc=graph.GetHdc();
ISymbol.SetupDC(hec.ToInt32,pDisTrans);
ISymbol.Draw(pCenterPt);
ISymbol.ResetDC();

//绘制完成后 是否绘图对象
graph.ReleaseHdc(hdc);
graph.Dispose();

Symbol的第二种方法

IStyleGalleryItem item=new ServerStyleGalleryItemClass();

item.Item=youSymbol;//你需要预览的ISymbol

stdole.IPictureDisp pic=axSymbologyControl1.GetStyleClass(esriSymbologyStyleClass).PriviewItem(item,100,100);

Image img=Image.FormHbitmap(new IntPtr(pic.Handle));

picPriview.Image=img;

3.2 绘制Element 在Panel控件上

其中 graph、pCenterPoint、pDisTrans 的设置方式和上面一样

以绘制线段为例：

IDisplay pDisplay=new SimpleDisplay();

pDisplay.StartDrawing(graph.GetHdc(),ToInt32(),(short)esriScreeCache.esriNoScreeCache);

pDisplay.DisplayTransformation=pDisTrans;

pDisplay.SetSymbol(LineSymbol);//设置绘制线段的符号

pDisplay.DrawPolyline(IGeometry) ;//设置绘制线段的几何数据

//在arcgis帮助中找吧

参考文章

ArcGIS Engine 线段绘制研究

ArcEngine画shapefile点，线，面

ArcEngine中画shape点的另一种方法

Arcengine 绘制Element、Symbol 在控件上

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