[Qt-interest] Keep Same QGraphicsItem's Pen Width Across Scaling

[Josiah Bryan]

I've got a custom QGraphicsItem (simple box) that draws an outline 
around itself, say 3px wide. Great for "normal" live view. However, my 
app also renders an "icon" view of the scene that the box is in - this 
"icon" is about 96x96. Then there's also the "preview" view of the scene 
before it goes live, this is rendered about 320x240. The live scene is 
scaled approx 1:1, so its about 1024x768.

What I'm wondering is if there's any way for my custom graphics item to 
find out the scale it's being rendered at so that it can adjust it's pen 
width accordingly inorder to render at approx 3px width regardless of 
scale? (The outline isn't always 3px - it can vary depending on various 
other factors [type of box, datapoint the box represents, etc]).

Any ideas on how to find the scale of the scene from inside the paint 
method of my graphics item?

Thanks!
-josiah


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Josiah Bryan
Productive Concepts, Inc.
jbryan at pciint.com
(765) 964-6009, ext. 224