private void ExportActiveViewParameterized(long iOutputResolution, long lResampleRatio, string ExportType, string sOutputDir, Boolean bClipToGraphicsExtent) { /* EXPORT PARAMETER: (iOutputResolution) the resolution requested. * EXPORT PARAMETER: (lResampleRatio) Output Image Quality of the export. The value here will only be used if the export * object is a format that allows setting of Output Image Quality, i.e. a vector exporter. * The value assigned to ResampleRatio should be in the range 1 to 5. * 1 corresponds to "Best", 5 corresponds to "Fast" * EXPORT PARAMETER: (ExportType) a string which contains the export type to create. * EXPORT PARAMETER: (sOutputDir) a string which contains the directory to output to. * EXPORT PARAMETER: (bClipToGraphicsExtent) Assign True or False to determine if export image will be clipped to the graphic * extent of layout elements. This value is ignored for data view exports */
/* Exports the Active View of the document to selected output format. */
IActiveView docActiveView =this.axPageLayoutControl1.ActiveView; IExport docExport; long iPrevOutputImageQuality; IOutputRasterSettings docOutputRasterSettings; IEnvelope PixelBoundsEnv; tagRECT exportRECT; tagRECT DisplayBounds; IDisplayTransformation docDisplayTransformation; IPageLayout docPageLayout; IEnvelope docMapExtEnv; long hdc; //long tmpDC; string sNameRoot; long iScreenResolution; bool bReenable = false;
IEnvelope docGraphicsExtentEnv; IUnitConverter pUnitConvertor;
// The Export*Class() type initializes a new export class of the desired type.
if (ExportType == "PDF") { docExport = new ExportPDFClass(); } else if (ExportType == "EPS") { docExport = new ExportPSClass(); } else if (ExportType == "AI") { docExport = new ExportAIClass(); } else if (ExportType == "BMP") {
docExport = new ExportBMPClass(); } else if (ExportType == "TIFF") { docExport = new ExportTIFFClass(); } else if (ExportType == "SVG") { docExport = new ExportSVGClass(); } else if (ExportType == "PNG") { docExport = new ExportPNGClass(); } else if (ExportType == "GIF") { docExport = new ExportGIFClass(); } else if (ExportType == "EMF") { docExport = new ExportEMFClass(); } else if (ExportType == "JPEG") { docExport = new ExportJPEGClass(); } else { MessageBox.Show("Unsupported export type " + ExportType + ", defaulting to EMF."); ExportType = "EMF"; docExport = new ExportEMFClass(); }
// save the previous output image quality, so that when the export is complete it will be set back. docOutputRasterSettings = docActiveView.ScreenDisplay.DisplayTransformation as IOutputRasterSettings; iPrevOutputImageQuality = docOutputRasterSettings.ResampleRatio;
if (docExport is IExportImage) { // always set the output quality of the DISPLAY to 1 for image export formats SetOutputQuality(docActiveView, 1); } else { // for vector formats, assign the desired ResampleRatio to control drawing of raster layers at export time SetOutputQuality(docActiveView, lResampleRatio); }
//set the name root for the export sNameRoot = "ExportActiveViewSampleOutput";
//set the export filename (which is the nameroot + the appropriate file extension) docExport.ExportFileName = sOutputDir + sNameRoot + "." + docExport.Filter.Split('.')[1].Split('|')[0].Split(')')[0];
/* Get the device context of the screen */ //tmpDC = docExport.StartExporting(); ; /* Get the screen resolution. */ iScreenResolution = 300; //88 is the win32 const for Logical pixels/inch in X) /* release the DC. */ // docExport.FinishExporting(); docExport.Resolution = iOutputResolution;
if (docActiveView is IPageLayout) { //get the bounds of the "exportframe" of the active view. DisplayBounds = docActiveView.ExportFrame; //set up pGraphicsExtent, used if clipping to graphics extent. docGraphicsExtentEnv = GetGraphicsExtent(docActiveView); } else { //Get the bounds of the deviceframe for the screen. docDisplayTransformation = docActiveView.ScreenDisplay.DisplayTransformation; DisplayBounds = docDisplayTransformation.get_DeviceFrame(); }
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;
// call the StartExporting method to tell docExport you're ready to start outputting. SetOutputQuality(docActiveView, iPrevOutputImageQuality); hdc = docExport.StartExporting();
// Redraw the active view, rendering it to the exporter object device context instead of the app display. // We pass the following values: // * hDC is the device context of the exporter object. // * exportRECT is the tagRECT structure that describes the dimensions of the view that will be rendered. // The values in exportRECT should match those held in the exporter object's PixelBounds property. // * docMapExtEnv is an envelope defining the section of the original image to draw into the export object. docActiveView.Output((int)hdc, (int)docExport.Resolution, ref exportRECT, docMapExtEnv, null);
//finishexporting, then cleanup. docExport.FinishExporting(); docExport.Cleanup();
MessageBox.Show("Finished exporting " + sOutputDir + sNameRoot + "." + docExport.Filter.Split('.')[1].Split('|')[0].Split(')')[0] + ".", "Export Active View Sample");
//set the output quality back to the previous value if (bReenable) { }
docMapExtEnv = null; PixelBoundsEnv = null; }
private void SetOutputQuality(IActiveView docActiveView, long iResampleRatio) { /* This function sets OutputImageQuality for the active view. If the active view is a pagelayout, then * it must also set the output image quality for EACH of the Maps in the pagelayout. */ IGraphicsContainer oiqGraphicsContainer; IElement oiqElement; IOutputRasterSettings docOutputRasterSettings; IMapFrame docMapFrame; IActiveView TmpActiveView;
if (docActiveView is IMap) { docOutputRasterSettings = docActiveView.ScreenDisplay.DisplayTransformation as IOutputRasterSettings; docOutputRasterSettings.ResampleRatio = (int)iResampleRatio; } else if (docActiveView is IPageLayout) { //assign ResampleRatio for PageLayout docOutputRasterSettings = docActiveView.ScreenDisplay.DisplayTransformation as IOutputRasterSettings; docOutputRasterSettings.ResampleRatio = (int)iResampleRatio; //and assign ResampleRatio to the Maps in the PageLayout oiqGraphicsContainer = docActiveView as IGraphicsContainer; oiqGraphicsContainer.Reset();
oiqElement = oiqGraphicsContainer.Next(); while (oiqElement != null) { if (oiqElement is IMapFrame) { docMapFrame = oiqElement as IMapFrame; TmpActiveView = docMapFrame.Map as IActiveView; docOutputRasterSettings = TmpActiveView.ScreenDisplay.DisplayTransformation as IOutputRasterSettings; docOutputRasterSettings.ResampleRatio = (int)iResampleRatio; } oiqElement = oiqGraphicsContainer.Next(); }
docMapFrame = null; oiqGraphicsContainer = null; TmpActiveView = null; } docOutputRasterSettings = null;
}
private IEnvelope GetGraphicsExtent(IActiveView docActiveView) { /* Gets the combined extent of all the objects in the map. */ IEnvelope GraphicsBounds; IEnvelope GraphicsEnvelope; IGraphicsContainer oiqGraphicsContainer; IPageLayout docPageLayout; IDisplay GraphicsDisplay; IElement oiqElement;
GraphicsBounds = new EnvelopeClass(); GraphicsEnvelope = new EnvelopeClass(); docPageLayout = docActiveView as IPageLayout; GraphicsDisplay = docActiveView.ScreenDisplay; oiqGraphicsContainer = docActiveView as IGraphicsContainer; oiqGraphicsContainer.Reset();
oiqElement = oiqGraphicsContainer.Next(); while (oiqElement != null) { oiqElement.QueryBounds(GraphicsDisplay, GraphicsEnvelope); GraphicsBounds.Union(GraphicsEnvelope); oiqElement = oiqGraphicsContainer.Next(); }
return GraphicsBounds;
}
调用方法:
System.Diagnostics.Stopwatch MyWatch = new System.Diagnostics.Stopwatch(); MyWatch.Start(); // ExportMapExtent1(this.axPageLayoutControl1, @"e:\qq.emf"); ExportActiveViewParameterized(300, 1, "PDF", "e:\\gisoracle", false); MyWatch.Stop(); MessageBox.Show("删除时间:" + MyWatch.ElapsedMilliseconds.ToString() + "毫秒");
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