地图输出栅格图片的简单方法，返回输出的文件名

最新推荐文章于 2023-11-17 09:00:00 发布

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/// <summary>
        /// 地图输出栅格图片的简单方法，返回输出的文件名
        /// </summary>
        /// <param name="pActiveView"></param>
        /// <returns></returns>
        public static string ExportImage(IActiveView pActiveView)
        {

            if (pActiveView == null)
            {
                return "";
            }

            SaveFileDialog pSaveFileDialog = new SaveFileDialog();
            pSaveFileDialog.Filter = "JPEG(*.jpeg)|*.jpeg|AI(*.ai)|*.ai|BMP(*.BMP)|*.bmp|EMF(*.emf)|*.emf|GIF(*.gif)          |*.gif|PDF(*.pdf)|*.pdf|PNG(*.png)|*.png|EPS(*.eps)|*.eps|SVG(*.svg)|*.svg|TIFF(*.tif)|*.tif";
            pSaveFileDialog.Title = "输出地图";
            pSaveFileDialog.RestoreDirectory = true;
            pSaveFileDialog.FilterIndex = 1;

            if (pSaveFileDialog.ShowDialog() != System.Windows.Forms.DialogResult.OK)
            {
                return "";
            }
            string FileName = pSaveFileDialog.FileName;

            IExport pExporter = null;
            switch (pSaveFileDialog.FilterIndex)
            {
                case 1:
                    pExporter = new ExportJPEGClass();
                    break;
                case 2:
                    pExporter = new ExportBMPClass();
                    break;
                case 3:
                    pExporter = new ExportEMFClass();
                    break;
                case 4:
                    pExporter = new ExportGIFClass();
                    break;

                case 5:
                    pExporter = new ExportAIClass();
                    break;

                case 6:
                    pExporter = new ExportPDFClass();
                    break;
                case 7:
                    pExporter = new ExportPNGClass();
                    break;
                case 8:
                    pExporter = new ExportPSClass();
                    break;
                case 9:
                    pExporter = new ExportSVGClass();
                    break;
                case 10:
                    pExporter = new ExportTIFFClass();
                    break;
                default:
                    MessageBox.Show("输出格式错误");
                    return null;

            }

            int pResolution = (int)(pActiveView.ScreenDisplay.DisplayTransformation.Resolution);

tagRECT ptagRECT = pActiveView.ExportFrame;//注意该处的代码，改为其他会出错

IEnvelope pEnvelope = new EnvelopeClass();
pEnvelope.PutCoords(ptagRECT.left, ptagRECT.bottom, ptagRECT.right, ptagRECT.top);

ITrackCancel pTrackCancel = new CancelTrackerClass();

            pExporter.Resolution = pResolution;
            pExporter.ExportFileName = FileName;
            pExporter.PixelBounds = pEnvelope;

            pActiveView.Output(pExporter.StartExporting(), pResolution, ref ptagRECT, pActiveView.Extent, pTrackCancel);
            pExporter.FinishExporting();
            pExporter.Cleanup();

            //释放资源
            pSaveFileDialog.Dispose();

            System.Runtime.InteropServices.Marshal.ReleaseComObject(pExporter);

            return FileName;

}