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
Arcengine 绘制Element、Symbol 在控件上
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