导出图片，包含栅格的地图导出的图片模糊，arcgis eingine

最新推荐文章于 2023-12-04 10:45:35 发布

转载最新推荐文章于 2023-12-04 10:45:35 发布 · 8.3k 阅读

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#arcgis #c# #栅格 #导出图片

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本文详细介绍了当栅格数据进行重采样时遇到问题的原因，并提供了具体的解决方法，包括如何使用PixelBoundsEnv、IEnvelope、UnitConverter等组件来确保正确分配输出尺寸。同时，阐述了在不同情况下如何根据文档的图形范围和页面布局进行裁剪和调整，以实现精确的输出结果。

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原因：栅格数据重采样了，解决方法：

PixelBoundsEnv = new Envelope() as IEnvelope;

            if (bClipToGraphicsExtent && (docActiveView is IPageLayout))
            {
                docGraphicsExtentEnv = GetGraphicsExtent(docActiveView);
                docPageLayout = docActiveView as PageLayout;
                pUnitConvertor = new UnitConverter();

                //assign the x and y values representing the clipped area to the PixelBounds envelope
                PixelBoundsEnv.XMin = 0;
                PixelBoundsEnv.YMin = 0;
                PixelBoundsEnv.XMax = pUnitConvertor.ConvertUnits(docGraphicsExtentEnv.XMax, docPageLayout.Page.Units, esriUnits.esriInches) * docExport.Resolution - pUnitConvertor.ConvertUnits(docGraphicsExtentEnv.XMin, docPageLayout.Page.Units, esriUnits.esriInches) * docExport.Resolution;
                PixelBoundsEnv.YMax = pUnitConvertor.ConvertUnits(docGraphicsExtentEnv.YMax, docPageLayout.Page.Units, esriUnits.esriInches) * docExport.Resolution - pUnitConvertor.ConvertUnits(docGraphicsExtentEnv.YMin, docPageLayout.Page.Units, esriUnits.esriInches) * docExport.Resolution;

                //'assign the x and y values representing the clipped export extent to the exportRECT
                exportRECT.bottom = (int)(PixelBoundsEnv.YMax) + 1;
                exportRECT.left = (int)(PixelBoundsEnv.XMin);
                exportRECT.top = (int)(PixelBoundsEnv.YMin);
                exportRECT.right = (int)(PixelBoundsEnv.XMax) + 1;

                //since we're clipping to graphics extent, set the visible bounds.
                docMapExtEnv = docGraphicsExtentEnv;
            }
            else
            {
                double tempratio = iOutputResolution / iScreenResolution;
                double tempbottom = DisplayBounds.bottom * tempratio;
                double tempright = DisplayBounds.right * tempratio;
                //'The values in the exportRECT tagRECT correspond to the width
                //and height to export, measured in pixels with an origin in the top left corner.
                exportRECT.bottom = (int)Math.Truncate(tempbottom);
                exportRECT.left = 0;
                exportRECT.top = 0;
                exportRECT.right = (int)Math.Truncate(tempright);

                //populate the PixelBounds envelope with the values from exportRECT.
                // We need to do this because the exporter object requires an envelope object
                // instead of a tagRECT structure.
                PixelBoundsEnv.PutCoords(exportRECT.left, exportRECT.top, exportRECT.right, exportRECT.bottom);

                //since it's a page layout or an unclipped page layout we don't need docMapExtEnv.
                docMapExtEnv = null;
            }

            // Assign the envelope object to the exporter object's PixelBounds property.  The exporter object
            // will use these dimensions when allocating memory for the export file.
            docExport.PixelBounds = PixelBoundsEnv;