C#+ArcEngine 自定义范围输出为栅格图像(JPG/BMP)

最新推荐文章于 2021-04-25 19:32:12 发布

转载最新推荐文章于 2021-04-25 19:32:12 发布 · 260 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/JinDin/archive/2008/08/28/1278943.html

本文介绍了一种在ArcGIS中实现图像导出的方法，详细解释了如何通过自定义可见区域来调整输出图像的分辨率及尺寸，并提供了具体的代码实现。

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/// <summary>
        /// 打印输出.该功能目前测试只适用于JPEG,BMP.格式
        /// </summary>
        /// <param name="pExport"></param>
        /// <param name="dResolution">分辨率</param>
        /// <param name="outputPath">输出路径</param>
        /// <param name="pVisibleBounds">自定义可见区域</param>
        private void FunExportImage(IExport pExport, double dResolution, string outputPath,IEnvelope pVisibleBounds)
        {
            IEnvelope pPixelBounds;
            ESRI.ArcGIS.Display.tagRECT outtagRECT;
            ESRI.ArcGIS.Display.tagRECT DisplayBounds = m_ActiveView.ExportFrame;
            double iScreenResolution;
            if (pExport == null)
            {
                MessageBox.Show("打印类型未指定");
                return;
            }

            if(pVisibleBounds!=null) //自定义框范围
            {
                IDisplayTransformation pDisplayTransformation = m_ActiveView.ScreenDisplay.DisplayTransformation;
                pDisplayTransformation.TransformRect(pVisibleBounds, ref DisplayBounds, 8);//8代表esriDisplayTransformEnum.esriTransformToDevice
            }

            if (pExport is IExportImage)
            {
                IExportImage pExportImage = pExport as IExportImage;
                pExportImage.ImageType = esriExportImageType.esriExportImageTypeTrueColor;
            }

            iScreenResolution = m_ActiveView.ScreenDisplay.DisplayTransformation.Resolution;

            double l_resolution = Convert.ToDouble(domainResolution.Value);

            //=====================================================================
            //
            //方法一
            //
            //一厘米包含37.79524个像素
            //double dPixel = 37.79524;
            ////按照设置输入分辨率计算一厘米所含的像素数
            //double tempratio = l_resolution * dPixel / iScreenResolution;
            ////输出图形的高度
            //double tempbottom = (DisplayBounds.bottom - DisplayBounds.top) * tempratio;
            ////输出图形的宽度
            //double tempright = (DisplayBounds.right - DisplayBounds.left) * tempratio + 0.1 * tempratio;
            //======================================================================
            //
            //方法二:暂时可行.
            //
            double tempratio = l_resolution / iScreenResolution;
            double tempbottom = (DisplayBounds.bottom - DisplayBounds.top) * tempratio;
            double tempright = (DisplayBounds.right - DisplayBounds.left) * tempratio;
            //=====================================================================
            outtagRECT.left = 0;
            outtagRECT.top = 0;
            outtagRECT.bottom = Convert.ToInt32(Math.Truncate(tempbottom));
            outtagRECT.right = Convert.ToInt32(Math.Truncate(tempright));

            pPixelBounds = new EnvelopeClass();
            pPixelBounds.PutCoords(outtagRECT.left, outtagRECT.top, outtagRECT.right, outtagRECT.bottom);

            pExport.Resolution = dResolution;
            pExport.PixelBounds = pPixelBounds;
            pExport.ExportFileName = outputPath;

            try
            {
                ITrackCancel pTrackCancel = new TrackCancelClass();
                int hDC;
                hDC = pExport.StartExporting();

                if (m_frmProBar == null) //m_frmProBar为进度条窗体
                    FunProgressBar();
                m_frmProBar.Show();

                m_ActiveView.Output(hDC, (int)dResolution, ref outtagRECT, pVisibleBounds, pTrackCancel);
                pExport.FinishExporting();

                m_frmProBar.Hide();

                if (DialogResult.Yes == MessageBox.Show("出图成功! \n图片保存在" + txtOutPutPath.Text+"\n是否需要打开文件所在的目录？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information))
                {
                    System.Diagnostics.Process.Start("explorer.exe", txtOutPutPath.Text);
                }
                pExport.Cleanup();
            }
            catch
            {
                MessageBox.Show("出图失败!","警告",MessageBoxButtons.OK,MessageBoxIcon.Warning);
                //释放变量
                m_frmProBar = null;
                pExport = null;
                pVisibleBounds = null;
            }
            //释放变量
            pExport = null;
            pVisibleBounds = null;

        }

转载于:https://www.cnblogs.com/JinDin/archive/2008/08/28/1278943.html