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choohj70
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PDF Export Clipping Node Content
May 27th, 2010 at 6:53pm
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I am experiencing a weird behavior when exporting a diagram to PDF. When looking at the screen, the node has sufficient margin around it and is able to fit the content. When exported to PDF, the margin is smaller and in many cases, the content is cut off because the node is smaller than the content.

Below is the code that I am using to export.
How can this be resolved?

Dim pdf As New MindFusion.Diagramming.Export.PdfExporter
Dim path As String = Server.MapPath("~\PDF\") + fileName

pdf.PageOrientation = MindFusion.Pdf.PageOrientation.Landscape
pdf.PageSize = MindFusion.Pdf.PageSize.Letter
pdf.Margins.Top = 10
pdf.Margins.Left = 10
pdf.Margins.Right = 10
pdf.Margins.Bottom = 10

pdf.AutoScale = AutoScale.FitToPage
pdf.DisableTextClipping = True
pdf.EnableBackground = False
pdf.Scale = 1.0
pdf.InvisibleItems = False

pdf.Export(diagramView.Diagram, path)

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Stoyo
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Re: PDF Export Clipping Node Content
Reply #1 - May 27th, 2010 at 7:14pm
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The Java and .NET text measuring functions return slightly different results, so the control can't produce exactly the same text layout on the server as on the client side. The only work-around I can think of is to loop over the nodes and subtract a point or half a point from their font size before exporting, so they can fit more text.

Stoyan
  
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choohj70
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Re: PDF Export Clipping Node Content
Reply #2 - May 27th, 2010 at 8:47pm
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Is there a way to measure the difference perhaps in pixels?

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Stoyo
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Re: PDF Export Clipping Node Content
Reply #3 - May 28th, 2010 at 12:38pm
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It might be possible - try calling diagram.measureString on the client, submitting the value to the server and comparing with server-side MeasureString result. Then you could multiply the server side font size by the ratio of the two values. I have tested this and the ratio was something like 5 / 6 for a 4mm Arial font - the following two calls returned 12x5 and 10x4 sizes:

Dimension2D d = diagram.measureString("TEST", new Font("Arial", 0, 4)); // java
SizeF s = diagram.MeasureString("TEST", new Font("Arial", 4, GraphicsUnit.Millimeter), 1000, StringFormat.GenericDefault); // C#

Stoyan
  
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choohj70
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Re: PDF Export Clipping Node Content
Reply #4 - May 28th, 2010 at 2:24pm
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Stoyan,

Thank you. That is exactly what I was thinking.
Now, is there a way to decrease the font sizes ONLY for exporting to PDF without affecting the diagram shown on the screen?

Thank you again.
  
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Stoyo
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Re: PDF Export Clipping Node Content
Reply #5 - May 28th, 2010 at 2:35pm
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You could copy the diagram by calling diagramCopy.LoadFromString(diagram.SaveToString()), modify the cloned nodes and then export diagramCopy.

I hope that helps,
Stoyan
  
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choohj70
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Re: PDF Export Clipping Node Content
Reply #6 - May 28th, 2010 at 5:10pm
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Stoyan,
Shouldn't the code for .NET use GraphicsUnit.Point rather than GraphicsUnit.Millimeter. If I am not mistaken, the Java function specifies the font size in points. Correct?

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Stoyo
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Re: PDF Export Clipping Node Content
Reply #7 - May 28th, 2010 at 6:49pm
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Hi,

The scale transform used to implement the MeasureUnit feature also scales the fonts in Java, so that value specifies size in the currently set unit. In .NET that happens only if you use the World unit.

Stoyan
  
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