在AE中高效添加地图指北针以提升地理信息准确性

  public static void ExportMapEx(string filepath, int resolution, AxMapControl curMapControl)
        {
            try
            {
                // 从Style文件中获取指定的指北针
                string stylefilePath = Application.StartupPath + @"\style\testArrow.ServerStyle";
                INorthArrow pNorthArrow = GetSymbol(stylefilePath, "North Arrows", "ESRI North 2") as INorthArrow;
                if (pNorthArrow == null) return;
                // 设置指北针的位置及大小
                ESRI.ArcGIS.Geometry.IEnvelope envelope3 = new ESRI.ArcGIS.Geometry.EnvelopeClass();
                envelope3.PutCoords(2, 2, 5, 5);

                // 设置当前活动视图,m_MapDocument为当前打开的地图文档
                IActiveView pCurActiveView = MyGIS.Forms.MainForm.m_MapDocument.PageLayout as IActiveView;
                MyGIS.Forms.MainForm.m_MapDocument.SetActiveView(pCurActiveView);
                IGraphicsContainer pGraphicContainer = (IGraphicsContainer)MyGIS.Forms.MainForm.m_MapDocument.PageLayout;

                IMapFrame mapFrame = pGraphicContainer.FindFrame(pCurActiveView.FocusMap) as IMapFrame ;
                IMapSurroundFrame mapSurroundFrame = new MapSurroundFrameClass();
                mapSurroundFrame.MapFrame = mapFrame;
                mapSurroundFrame.MapSurround = pNorthArrow as IMapSurround;
                IElement element = (IElement)mapSurroundFrame;
                element.Geometry = envelope3;

                // 添加元素
                element.Activate(pCurActiveView.ScreenDisplay);
                pGraphicContainer.AddElement(element, 0);
                //pCurActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, mapSurroundFrame, null);

                // 这里分辨率分两种情况：96dpi和300dpi
                string extension = System.IO.Path.GetExtension(filepath);
                IExport pExporter = null;
                if (extension == ".bmp")
                {
                    pExporter = new ExportBMPClass();
                }
                else if (extension == ".jpg")
                {
                    pExporter = new ExportJPEGClass();
                }
                else if (extension == ".png")
                {
                    pExporter = new ExportPNGClass();
                }
                else if (extension == ".gif")
                {
                    pExporter = new ExportGIFClass();
                }
                else if (extension == ".pdf")
                {
                    pExporter = new ExportPDFClass();
                }
                else if (extension == ".tif")
                {
                    pExporter = new ExportTIFFClass();
                }

                pExporter.ExportFileName = filepath;
                tagRECT deviceRECT = default(tagRECT);
                if (resolution < 96)
                {
                    return;
                }
                // 区分设置分辨率
                if (resolution == 96)
                {
                    pExporter.Resolution = resolution;
                    deviceRECT = pCurActiveView.ExportFrame;
                    IEnvelope pDriverBounds = new EnvelopeClass();
                    pDriverBounds.PutCoords(deviceRECT.left, deviceRECT.bottom, deviceRECT.right, deviceRECT.top);
                    pExporter.PixelBounds = pDriverBounds;
                }
                else
                {
                    System.Int32 screenResolution = 96;
                    pExporter.Resolution = resolution;
                    deviceRECT.left = 0;
                    deviceRECT.top = 0;
                    deviceRECT.right = (int)(pCurActiveView.ExportFrame.right * (resolution / screenResolution));
                    deviceRECT.bottom = (int)(pCurActiveView.ExportFrame.bottom * (resolution / screenResolution));

                    ESRI.ArcGIS.Geometry.IEnvelope envelope = new ESRI.ArcGIS.Geometry.EnvelopeClass();
                    envelope.PutCoords(deviceRECT.left, deviceRECT.top, deviceRECT.right, deviceRECT.bottom);
                    pExporter.PixelBounds = envelope;
                }

                //ITrackCancel pCancel = new CancelTrackerClass();
                //curMapControl.ActiveView.Output(pExporter.StartExporting(), Convert.ToInt32(lScreenResolution), ref deviceRECT, curMapControl.ActiveView.Extent, pCancel);
                pCurActiveView.Output(pExporter.StartExporting(), Convert.ToInt32(resolution), ref deviceRECT, null, null);
                pExporter.FinishExporting();
                pExporter.Cleanup();
                MessageBox.Show("导出图像成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            catch (System.Exception ex)
            {
                MessageBox.Show("导出异常： \n" + ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
        }