[vtkusers] How to draw a 5mm line with vtkImageCanvasSource2D?

[bnsteel]

Wouldn't you just assign a conversion between pixels and mm?  You could
specify this based on the magnification of your image, or look up the
resolution or pixel density on your monitor /display to get exactly 5mm on
the screen.  I guess the question then becomes how do you lookup the
resolution of the display from within your code?  

Best,
brooke

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