Arcengine實作：在 MapControl 上繪制幾何圖形

可以直接使用 axMapControl1.DrawShape 方法來實作~！

ISimpleLineSymbol pLineSym = new SimpleLineSymbol();
IRgbColor pColor = new RgbColor();
pColor.Red = 11;
pColor.Green = 120;
pColor.Blue = 233;
pLineSym.Color = pColor;
pLineSym.Style = esriSimpleLineStyle.esriSLSSolid;
pLineSym.Width = 2;


IPolyline pLine = axMapControl1.TrackLine() as IPolyline;


object symbol = pLineSym as object;
axMapControl1.DrawShape(pLine, ref symbol);
           

也可以通過 IScreenDisplay 接口的方法來實作！~

ISimpleLineSymbol pLineSym = new SimpleLineSymbol();
IRgbColor pColor = new RgbColor();
pColor.Red = 11;
pColor.Green = 120;
pColor.Blue = 233;
pLineSym.Color = pColor;
pLineSym.Style = esriSimpleLineStyle.esriSLSSolid;
pLineSym.Width = 2;


IPolyline pLine = axMapControl1.TrackLine() as IPolyline;


IScreenDisplay pScreenDisplay = axMapControl1.ActiveView.ScreenDisplay;
pScreenDisplay.StartDrawing(pScreenDisplay.hDC, 1);
pScreenDisplay.SetSymbol(pLineSym as ISymbol);
pScreenDisplay.DrawPolyline(pLine);
pScreenDisplay.FinishDrawing();
           

通過比較，隻是後面實作的部分不同，前面都是相同的！

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●·● 實作：在 MapControl 上繪制幾何圖形（IGraphicsContainer，幾何：圓）：

　　普通的圖形，可以直接向下面一樣實作！

m_ActiveView = m_hookHelper.ActiveView;
m_Map = m_hookHelper.FocusMap;
IScreenDisplay pScreenDisplay = m_ActiveView.ScreenDisplay;
IRubberBand pRubberPolygon = new RubberPolygonClass();
ISimpleFillSymbol pFillSymbol = new SimpleFillSymbolClass();
pFillSymbol.Color = getRGB(255, 255, 0);
IPolygon pPolygon = pRubberPolygon.TrackNew(pScreenDisplay, (ISymbol)pFillSymbol) as IPolygon;
pFillSymbol.Style = esriSimpleFillStyle.esriSFSDiagonalCross;
pFillSymbol.Color = getRGB(0, 255, 255);
IFillShapeElement pPolygonEle = new PolygonElementClass();
pPolygonEle.Symbol = pFillSymbol;
IElement pEle = pPolygonEle as IElement;
pEle.Geometry = pPolygon;
IGraphicsContainer pGraphicsContainer = m_Map as IGraphicsContainer;
pGraphicsContainer.AddElement(pEle, 0);
m_ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
           

　　畫圓比較特殊，因為沒有圓這個現成的幾何體，是以要轉換，如下所示：

m_ActiveView = m_hookHelper.ActiveView;
m_Map = m_hookHelper.FocusMap;
IScreenDisplay pScreenDisplay = m_ActiveView.ScreenDisplay;
IRubberBand pRubberCircle = new RubberCircleClass();
ISimpleFillSymbol pFillSymbol = new SimpleFillSymbolClass();
pFillSymbol.Color = getRGB(255, 255, 0);
IGeometry pCircle = pRubberCircle.TrackNew(pScreenDisplay, (ISymbol)pFillSymbol) as IGeometry;


IPolygon pPolygon = new PolygonClass();　　　　//空的多邊形
ISegmentCollection pSegmentCollection = pPolygon as ISegmentCollection;　　//段集合
ISegment pSegment = pCircle as ISegment;　　//将圓指派給段
object missing = Type.Missing;　　//顯示預設值
pSegmentCollection.AddSegment(pSegment, ref missing, ref missing);　　//給空多邊形加入圓
pFillSymbol.Style = esriSimpleFillStyle.esriSFSDiagonalCross;
pFillSymbol.Color = getRGB(0, 255, 255);
IFillShapeElement pPolygonEle = new PolygonElementClass();
pPolygonEle.Symbol = pFillSymbol;
IElement pEle = pPolygonEle as IElement;
pEle.Geometry = pPolygon;
IGraphicsContainer pGraphicsContainer = m_Map as IGraphicsContainer;
pGraphicsContainer.AddElement(pEle, 0);
m_ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);