[vtkusers] Font size and SetDPI()

[Tim Gollnik]

Hello!

I'm trying to understand how vtk handles text size in respect to the chosen 
screen resolution. To achieve that, i took the example script found 
in /Examples/Annotation/Tcl/multiLineText.tcl; after executing i type 'u' to 
get the command window.

The command 'renWin GetDPI' yields a value of 120.

Now: if i change this setting via SetDPI to, for example, 240, i would expect 
the text to get twice the previous size. But: nothing happens.

This is unexpected and hampering my attempts to obtain predictable high 
resolution screen prints via the vtkRenderLargeImage class with a selected 
magnification. The onscreen arrangements become worthless because of the 
apparently pixel bound size of text.

Could someone bring some light into my unawareness?

Many thanks in advance!

Tim Gollnik
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