C# ISymbol.Draw方法代码示例

        private void DrawToPictureBox(ISymbol pSym, PictureBox pBox)
        {
            IGeometry pGeometry = null;
            IntPtr hDC;
            IEnvelope pEnvelope;
            pEnvelope = new EnvelopeClass();
            // Reset the PictureBox
            pBox.CreateGraphics().Clear(pBox.BackColor);
            try
            {
                if (pSym is IMarkerSymbol)
                {
                    pEnvelope.PutCoords(pBox.Width / 2, pBox.Height / 2, pBox.Width / 2, pBox.Height / 2);
                    IArea pArea = pEnvelope as IArea;
                    pGeometry = pArea.Centroid;
                }
                else if (pSym is ILineSymbol)
                {
                    pEnvelope.PutCoords(0, pBox.Height / 2, pBox.Width, pBox.Height / 2);
                    IPolyline pPolyline = new PolylineClass();
                    pPolyline.FromPoint = pEnvelope.LowerLeft;
                    pPolyline.ToPoint = pEnvelope.UpperRight;
                    pGeometry = pPolyline;
                }
                else if (pSym is IFillSymbol)
                {
                    if (pSym is SimpleFillSymbol)
                    {
                        pEnvelope.PutCoords(5, 5, pBox.Width - 5, pBox.Height - 5);
                        pGeometry = pEnvelope;
                    }
                    else if (pSym is MultiLayerFillSymbol)
                    {
                        IMultiLayerFillSymbol pMultiLayerFillSymbol = pSym as IMultiLayerFillSymbol;
                        //For mLayers As Integer = 0 To pMultiLayerFillSymbol.LayerCount - 1
                        if (pMultiLayerFillSymbol.get_Layer(0) is PictureFillSymbol)
                        {
                            IPictureFillSymbol pPictureFillSymbol = pMultiLayerFillSymbol.get_Layer(0) as IPictureFillSymbol;
                            Bitmap m = Bitmap.FromHbitmap(new IntPtr(pPictureFillSymbol.Picture.Handle));
                            //m.MakeTransparent(System.Drawing.ColorTranslator.FromOle(pPictureFillSymbol.Color.RGB))
                            pBox.Image = m;
                            return;
                        }
                        else if (pMultiLayerFillSymbol.get_Layer(0) is SimpleFillSymbol)
                        {
                            pEnvelope.PutCoords(5, 5, pBox.Width - 5, pBox.Height - 5);
                            pGeometry = pEnvelope;
                        }
                        else if (pMultiLayerFillSymbol.get_Layer(0) is GradientFillSymbol)
                        {
                            IGradientFillSymbol pGradientFillSymbol = pMultiLayerFillSymbol.get_Layer(0) as IGradientFillSymbol;
                            IAlgorithmicColorRamp pRamp = pGradientFillSymbol.ColorRamp as IAlgorithmicColorRamp;
                            System.Drawing.Rectangle rect = new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), new System.Drawing.Size(pBox.Width, pBox.Height));
                            LinearGradientBrush lgBrush = new LinearGradientBrush(rect,
                                System.Drawing.ColorTranslator.FromOle(pRamp.FromColor.RGB),
                                System.Drawing.ColorTranslator.FromOle(pRamp.ToColor.RGB),
                                45);
                            Graphics g = pBox.CreateGraphics();
                            g.FillRectangle(lgBrush, rect);
                            rect.Width = rect.Width - 1;
                            rect.Height = rect.Height - 1;
                            g.DrawRectangle(new Pen(ColorTranslator.FromOle(pGradientFillSymbol.Outline.Color.RGB),
                                (float)pGradientFillSymbol.Outline.Width), rect);
                        }
                    }
                    else if (pSym is PictureFillSymbol)
                    {
                        IPictureFillSymbol pPictureFillSymbol = pSym as IPictureFillSymbol;
                        Bitmap m = Bitmap.FromHbitmap(new IntPtr(pPictureFillSymbol.Picture.Handle));
                        //m.MakeTransparent(System.Drawing.ColorTranslator.FromOle(pPictureFillSymbol.Color.RGB))
                        pBox.Image = m;
                        return;
                    }
                }

                hDC = GetDC(pBox.Handle);
                pSym.SetupDC(hDC.ToInt32(), null);
                pSym.ROP2 = esriRasterOpCode.esriROPCopyPen;
                if (pGeometry != null)
                    pSym.Draw(pGeometry);

                pSym.ResetDC();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void DrawToTarget(ISymbol pSym, PictureBox pBox)
        {
            IPoint pPoint = null;
            IGeometry pGeometry = null;

            IDisplayTransformation pDisplayTrans = null;

            if (pSym is IMarkerSymbol)
            {
                pPoint = new PointClass();      //the geometry of a MarkerSymbol
                pPoint.PutCoords(pBox.Width / 2, pBox.Height / 2);       //center in middle of pBox
                pGeometry = pPoint;
            }
            if (pSym is ILineSymbol)
            {
                ISegmentCollection polyline = new ESRI.ArcGIS.Geometry.PolylineClass();
                ISegment line = new ESRI.ArcGIS.Geometry.LineClass();
                IPoint fromPoint = new PointClass();
                fromPoint.PutCoords(pBox.Left, pBox.Bottom);
                IPoint toPoint = new PointClass();
                toPoint.PutCoords(pBox.Right, pBox.Top);
                line.FromPoint = fromPoint;
                line.ToPoint = toPoint;
                object missing = Type.Missing;
                polyline.AddSegment(line, ref missing, ref missing);
                pGeometry = polyline as IGeometry;
            }
            if (pSym is IFillSymbol)
            {
                IEnvelope pEnvelope = new EnvelopeClass();
                pEnvelope.PutCoords(pBox.Left, pBox.Top, pBox.Right, pBox.Bottom);
                pGeometry = pEnvelope;
            }
            pDisplayTrans = getTransformation(pBox) as IDisplayTransformation;
            pSym.SetupDC(pBox.Handle.ToInt32(), null);
            pSym.ROP2 = esriRasterOpCode.esriROPCopyPen;
            pSym.Draw(pGeometry);
            pSym.ResetDC();
        }

        private int GetBitmap(ISymbol symbol, IGeometry geometry, int lWidth, int lHeight)
        {
            if (symbol == null) return 0;
            if (geometry == null) return 0;

            RECT rect;
            rect.Left = 0;
            rect.Top = 0;
            rect.Right = lWidth;
            rect.Bottom = lHeight;

            int hDC = GetDC(0);
            int hMemDC = CreateCompatibleDC(hDC);
            int hBitmap = CreateCompatibleBitmap(hDC, lWidth, lHeight);
            int hOldBitmap = SelectObject(hMemDC, hBitmap);

            int hBrush = CreateSolidBrush(RGB2Long(255, 255, 255));
            int hOldBrush = SelectObject(hMemDC, hBrush);
            FillRect(hMemDC, rect, hBrush);//paint a white background.

            symbol.SetupDC(hMemDC, null);
            symbol.Draw(geometry);
            symbol.ResetDC();

            SelectObject(hDC, hOldBitmap);
            SelectObject(hDC, hOldBrush);
            DeleteObject(hBrush);

            ReleaseDC(0, hMemDC);
            ReleaseDC(0, hDC);
            DeleteDC(hMemDC);
            DeleteDC(hDC);
            return hBitmap;
        }

        private Bitmap DrawToPictureBox(ISymbol pSym, PictureBox pBox)
        {
            IPoint pPoint = null;
            IGeometry pGeometry = null;
            int hDC;
            System.Drawing.Graphics pGraphics = null;
            pGraphics = System.Drawing.Graphics.FromHwnd(pBox.Handle);
            //clear drawing canvas
            pGraphics.FillRectangle(System.Drawing.Brushes.White, pBox.ClientRectangle);
            if (pSym is IMarkerSymbol)
            {
                pPoint = new PointClass();      //the geometry of a MarkerSymbol
                pPoint.PutCoords(pBox.Width / 2, pBox.Height / 2);       //center in middle of pBox
                pGeometry = pPoint;
            }
            if (pSym is ILineSymbol)
            {
                ISegmentCollection polyline = new ESRI.ArcGIS.Geometry.PolylineClass();
                ISegment line = new ESRI.ArcGIS.Geometry.LineClass();
                IPoint fromPoint = new PointClass();
                fromPoint.PutCoords(pBox.Left, pBox.Bottom);
                IPoint toPoint = new PointClass();
                toPoint.PutCoords(pBox.Right, pBox.Top);
                line.FromPoint = fromPoint;
                line.ToPoint = toPoint;
                object missing = Type.Missing;
                polyline.AddSegment(line, ref missing, ref missing);
                pGeometry = polyline as IGeometry;
            }
            if (pSym is IFillSymbol)
            {
                IEnvelope pEnvelope = new EnvelopeClass();
                pEnvelope.PutCoords(pBox.Left, pBox.Top, pBox.Right, pBox.Bottom);
                pGeometry = pEnvelope;
            }

            hDC = GetDC(pBox.Handle.ToInt32());
            pSym.SetupDC(hDC, null);
            pSym.ROP2 = esriRasterOpCode.esriROPCopyPen;
            pSym.Draw(pGeometry);
            pSym.ResetDC();

            Bitmap image = new Bitmap(pBox.Width, pBox.Height, pGraphics);
            Graphics g2 = Graphics.FromImage(image);
            //获得屏幕的句柄
            IntPtr dc3 = pGraphics.GetHdc();
            //获得位图的句柄
            IntPtr dc2 = g2.GetHdc();
            BitBlt(dc2, 0, 0, pBox.Width, pBox.Height, dc3, 0, 0, SRCCOPY);
            pGraphics.ReleaseHdc(dc3);//释放屏幕句柄
            g2.ReleaseHdc(dc2);//释放位图句柄
            //image.Save("c:\\MyJpeg.Icon", ImageFormat.Bmp);
            return image;
        }

 private bool DrawToDC(int hdc, int lWidth, int lHeight, ISymbol pSymbol, int lGap)
 {
     // Create the Transformation and Geometry required by ISymbol::Draw.
     IEnvelope pEnvelope;
     ITransformation pTransformation;
     IGeometry pGeom;
     pEnvelope = new EnvelopeClass();
     pEnvelope.PutCoords(lGap, lGap, lWidth - lGap, lHeight - lGap);
     pTransformation = CreateTransFromDC(hdc, lWidth, lHeight);
     pGeom = CreateSymShape(pSymbol, pEnvelope);
     // Perform the Draw operation.
     if (pTransformation == null || pGeom == null) return false;
     pSymbol.SetupDC(hdc, pTransformation);
     pSymbol.Draw(pGeom);
     pSymbol.ResetDC();
     return true;
 }

        private Bitmap DrawToPictureBox(ISymbol pSym, PictureBox pBox)
        {
            IGeometry pGeometry = null;
                System.Drawing.Graphics pGraphics = null;
                pGraphics = System.Drawing.Graphics.FromHwnd(pBox.Handle);
                pGraphics.FillRectangle(System.Drawing.Brushes.White, pBox.ClientRectangle);
                Bitmap image = new Bitmap(pBox.Width, pBox.Height, pGraphics);
                IEnvelope pEnvelope = new EnvelopeClass();

                if (pSym is IMarkerSymbol)
                {
                    IPoint pPoint = new PointClass();      //the geometry of a MarkerSymbol
                    pPoint.PutCoords(pBox.Width / 2, pBox.Height / 2);       //center in middle of pBox
                    pGeometry = pPoint;
                }
                if (pSym is ILineSymbol)
                {
                    pEnvelope.PutCoords(0, pBox.Height / 2, pBox.Width, pBox.Height / 2);
                    IPolyline pPolyline = new PolylineClass();
                    pPolyline.FromPoint = pEnvelope.LowerLeft;
                    pPolyline.ToPoint = pEnvelope.UpperRight;
                    pGeometry = pPolyline;
                }
                if (pSym is IFillSymbol)
                {
                    pEnvelope.PutCoords(1, 1, pBox.Width - 1, pBox.Height - 1);
                    pGeometry = pEnvelope;

                    if (pSym is IMultiLayerFillSymbol)
                    {
                        IMultiLayerFillSymbol pMultiLayerFillSymbol = pSym as IMultiLayerFillSymbol;
                        //For mLayers As Integer = 0 To pMultiLayerFillSymbol.LayerCount - 1
                        for (int i = 0; i < pMultiLayerFillSymbol.LayerCount; i++)
                        {
                            if (pMultiLayerFillSymbol.get_Layer(i) is IPictureFillSymbol)
                            {
                                IPictureFillSymbol pPictureFillSymbol = pMultiLayerFillSymbol.get_Layer(0) as IPictureFillSymbol;
                                image = Bitmap.FromHbitmap(new IntPtr(pPictureFillSymbol.Picture.Handle));
                                //m.MakeTransparent(System.Drawing.ColorTranslator.FromOle(pPictureFillSymbol.Color.RGB))
                                return image;
                            }
                            else if (pMultiLayerFillSymbol.get_Layer(i) is ISimpleFillSymbol)
                            {
                                pEnvelope.PutCoords(1, 1, pBox.Width - 1, pBox.Height - 1);
                                pGeometry = pEnvelope;
                            }
                            else if (pMultiLayerFillSymbol.get_Layer(i) is IGradientFillSymbol)
                            {
                                IGradientFillSymbol pGradientFillSymbol = pMultiLayerFillSymbol.get_Layer(0) as IGradientFillSymbol;
                                IAlgorithmicColorRamp pRamp = pGradientFillSymbol.ColorRamp as IAlgorithmicColorRamp;
                                System.Drawing.Rectangle rect = new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), new System.Drawing.Size(pBox.Width, pBox.Height));
                                LinearGradientBrush lgBrush = new LinearGradientBrush(rect,
                                    System.Drawing.ColorTranslator.FromOle(pRamp.FromColor.RGB),
                                    System.Drawing.ColorTranslator.FromOle(pRamp.ToColor.RGB),
                                    45);
                                pGraphics.FillRectangle(lgBrush, rect);
                                rect.Width = rect.Width - 1;
                                rect.Height = rect.Height - 1;
                                pGraphics.DrawRectangle(new Pen(ColorTranslator.FromOle(pGradientFillSymbol.Outline.Color.RGB),
                                    (float)pGradientFillSymbol.Outline.Width), rect);
                                image = new Bitmap(pBox.Width, pBox.Height, pGraphics);
                            }
                        }
                    }
                    else if (pSym is IPictureFillSymbol)
                    {
                        IPictureFillSymbol pPictureFillSymbol = pSym as IPictureFillSymbol;
                        image = Bitmap.FromHbitmap(new IntPtr(pPictureFillSymbol.Picture.Handle));
                        //m.MakeTransparent(System.Drawing.ColorTranslator.FromOle(pPictureFillSymbol.Color.RGB))
                        return image;
                    }
                }

                IntPtr hDC = GetDC(pBox.Handle);
                pSym.SetupDC(hDC.ToInt32(), null);
                pSym.ROP2 = esriRasterOpCode.esriROPCopyPen;
                if (pGeometry != null) pSym.Draw(pGeometry);
                pSym.ResetDC();

                Graphics g2 = Graphics.FromImage(image);
                //获得屏幕的句柄
                IntPtr dc3 = pGraphics.GetHdc();
                //获得位图的句柄
                IntPtr dc2 = g2.GetHdc();
                BitBlt(dc2, 0, 0, pBox.Width, pBox.Height, dc3, 0, 0, SRCCOPY);
                pGraphics.ReleaseHdc(dc3);//释放屏幕句柄
                g2.ReleaseHdc(dc2);//释放位图句柄
                //image.Save("c:\\MyJpeg.Icon", ImageFormat.Bmp);
                return image;
        }

        private Image ImageFromSymbol(ISymbol symbol, Int32 width, Int32 height)
        {
            if (symbol == null)
                return null;

            try
            {
                Bitmap bitmap = new Bitmap(width, height);
                Graphics g = Graphics.FromImage(bitmap);
                IntPtr hdc = g.GetHdc();

                IGeometry geometry = null;
                if (symbol is IMarkerSymbol)
                {
                    IPoint point = new PointClass();
                    point.X = (width / 2);
                    point.Y = (height / 2);
                    geometry = point;
                }
                else if (symbol is ILineSymbol)
                {
                    IPolyline line = new PolylineClass();
                    IPoint ptFrom = new PointClass();
                    IPoint ptTo = new PointClass();
                    ptFrom.X = 3; ptFrom.Y = (height / 2);
                    ptTo.X = (width - 3); ptTo.Y = ptFrom.Y;
                    line.FromPoint = ptFrom;
                    line.ToPoint = ptTo;
                    geometry = line;
                }
                else
                {
                    IEnvelope bounds = new EnvelopeClass();
                    bounds.XMin = 1; bounds.XMax = width - 1;
                    bounds.YMin = 1; bounds.YMax = height - 1;
                    geometry = bounds;
                }

                symbol.SetupDC(hdc.ToInt32(), null);
                symbol.Draw(geometry);
                symbol.ResetDC();
                g.ReleaseHdc(hdc);
                g.Dispose();

                return bitmap as Image;
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message);
                return null;
            }
        }

 public static Image StyleToImage(ISymbol sym, int width, int height)
 {
     if (sym == null)
     {
         return null;
     }
     try
     {
         Image image = new Bitmap(width, height);
         Graphics graphics = Graphics.FromImage(image);
         IntPtr hdc = graphics.GetHdc();
         IEnvelope env = new EnvelopeClass();
         env.XMin = 1.0;
         env.XMax = width - 1;
         env.YMin = 1.0;
         env.YMax = height - 1;
         IGeometry geometry = CreateGeometryFromSymbol(sym, env);
         if (geometry != null)
         {
             ITransformation transformation = DisplayHelper.CreateTransformationFromHDC(hdc, width, height);
             sym.SetupDC((int)hdc, transformation);
             sym.Draw(geometry);
             sym.ResetDC();
         }
         graphics.ReleaseHdc(hdc);
         return image;
     }
     catch
     {
         return null;
     }
 }