I have created my own print preview and I have implemented an option to fit the digram to a single page. Here is what I have so far (unimportant code is omitted):

double pageWidth = 8.5 * 96;
double pageHeight = 11 * 96;
ScrollViewerDiagram.Height = pageHeight - 96;  // -96 accounts for margins
ScrollViewerDiagram.Width = pageWidth - 96;
ScrollViewerDiagram.Content = diagram;
diagram.ZoomToFit();

//generate temporary file name
string uri = System.IO.Path.GetTempFileName();
if (File.Exists(uri) == true)
    File.Delete(uri);

XpsDocument doc = new XpsDocument(uri, FileAccess.ReadWrite);
XpsSerializationManager rsm = new XpsSerializationManager(new XpsPackagingPolicy(doc), false);

DocumentPaginator paginator = diagram.DocumentPaginator;
paginator.PageSize = new Size(pageWidth, pageHeight);
rsm.SaveAsXaml(paginator); 

This creates a beautiful document with the diagram all on one page, but there are three for four blank pages in the document. Is there an easy fix for this without having to create a new document and copy over only the first page?  Am I approaching this the right way to fit the diagram to a single page?

-Ben

Hi Stoyan,

That did not seems to affect the output.  If I comment the ZoomToFit() line, it does in fact need 4 pages.  When I leave in the ZoomToFit(), it is all on 1 page, but there are still 4 pages, 3 of which are blank.

For some reason I can set diagram.PrintOptions.Scale to anything and it does not affect the output.

-Ben

This does not seem to help either.  No matter what the diagram.PrintOptions.Scale is set to, there is always the same number of pages.  I verified that diagram.IsLoaded returns true and also tried UpdateLayout.  For now, I will just extract the first page and create a new XPS document.  Let me know if you have any further insights though.  It must be some sort of layout / render / measure issue I would imagine.

Try the latest version 2.4; PrintOptions.Scale seems to work fine in my test with it.

Stoyan

How is PrintPreview implemented in 2.4?

Because our product is allready released with WpfDiagram 2.2.0.25609 and are unable (restricted) to upgrade.

I used the DocumentPaginator as in the example.

What is exactly the 'fix' between version 2.4 and 2.2 that don't creates blank pages?

There sould be a solution available to work arround this problem.

Yes that would be nice.

Because i don't know exactly how the number of page's is calculated.

I see that the page calculations is now fixed, but when my diagram can be print in 4 pages it needs 7 pages to display the hole diagram in the printpreview in that case it has 3 blank pages in between.