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");