paint-brush visualisation

[Thomas Zander]

Yesterday we had a conversation on IRC about brush visualizations for 
painting.
I proposed the assertion that using the shape of the brush is useless 
since we want to deform the brush while painting. The pen pressure and 
the brush positions are therefor much more important.

I gave some explanation of how I thought things could look, but I know 
that text is a bad way to convey visual ideas.
So this morning I spent a couple of hours whipping up a example that shows 
what I mean.

See attached,
To try it; run qmake; make; ./brush
Its a tablet-only thing.  it won't do anything when using the mouse!

It was fun to create, and its fun to play with it; maybe its useful for 
some further work :)
-- 
Thomas Zander
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