NiXPS
Wednesday, September 30, 2009
  XPS Imposition
I've written a small example script for NiXPS View v3.0 that implements XPS imposition.

Given a multipage file, it imposes 2 pages on 1 landscape A4 - so a 16 page document will yield an 8 page document, where each page has 2 pages on it.

The script is fairly simple, about 50 lines of code:

First, define our A4 paper size:

// paper size, use A4
lMaxWidth=1056;
lMaxHeight=816;


Then create a new XPS file:

// create a new XPS file, with a single document
lNewXPS=new NOPackage();
lNewXPS=lNewXPS.create(true,"spreads.xps");
lNewDoc=lNewXPS.getDocument(0);


Next, we walk over all the pages is the currently active document, and put 2 pages on each page. We do some RenderTransform magic to position the pages correctly:

// get the doc
lDocument=App.getDocument();
lNumberOfPages=lDocument.getNumberOfPages();

for (i=0; i<lNumberOfPages; i++)
{
if (i % 2==0)
{
// create a new page
lNewPage=lNewDoc.createPage();
lNewFixedPage=lNewPage.getFixedPage();
lNewFixedPage.setWidth(lMaxWidth);
lNewFixedPage.setHeight(lMaxHeight);
lOffsetX=0;
lNum=0;
} else
{
lOffsetX=lMaxWidth/2;
lNum=1;
}
// access the page
lPage=lDocument.getPage(i);
lFixedPage=lPage.getFixedPage();
lPageWidth=lFixedPage.getWidth();
lPageHeight=lFixedPage.getHeight();

// calculate the factor
lFactorWidth=(lMaxWidth/2)/lPageWidth;
lFactorHeight=lMaxHeight/lPageHeight;
lFactor=lFactorWidth;
if (lFactorHeight<lFactor)
lFactor=lFactorHeight;

// copy page on top
lNewPage.copyPageOnTop(lPage);
lCanvas=lNewFixedPage.getCanvas(lNum);
lCanvas.setRenderTransform(lFactor+",0,0,"+lFactor+","+lOffsetX+",0");
}


And that's it. Only thing left to do now at this point is give the newly created XPS file to the application, so the user can work with it further.

App.addPackage(lNewXPS);


As you can see you can fairly easy leverage the NiXPS SDK in Javascript this way. It's great for tools and customizations, and also for experimenting, as it is also fairly easy to convert this script to a C-Sharp or C++ source, and use it in conjunction with our SDK.

You can download the script, and find more on scripting on http://nixps.com/scripting
You can read more about our NiXPS SDK here
 
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