On Tuesday 09 May 2006 01:52 pm, GSR - FR wrote:
> Hi,
>
> [EMAIL PROTECTED] (2006-05-09 at 1654.44 +0100):
> > Joao S. O. Bueno Calligaris wrote:
> > > On Monday 08 May 2006 10:51 pm, GSR - FR wrote:
> > >> That reminds me another parameter, velocity (or time delta, it
> > >> is related) and that airbrush had issues with high speed...
> > >> anybody knows the exact definition and use of
> > >> gimp_paint_core_paint's guint32 time (I traced to
> > >> http://developer.gimp.org/api/2.0/app/GimpPaintCore.html but
> > >> says nothing)?
> > >
> > > I tried to fiddle with it once (implementing speed as a way to
> > > select the frame of animated brushes), and got mostly lost
> > > myself. All I know is that the ink tool has a different
> > > implementation that does "time smoothing"  or something to
> > > interpolate the gtk+ event time.
>
> [...]
>
> > I don't think that any other brushes at the time were velocity-
> > sensitive (are they now?), hence the private implementation.
>
> Animated brushes can be saved with such config... but it does
> nothing as it is not implemented publicly, so I guess anybody that
> tries the setting just gives up and saves with any of the other
> options from the drop downs.


Hmm.it does now - the patcjh for it has been comited some months ago - 
but, it doe slittle- not very usefull without a callibration curve 
and a way to smooth down the time coordinates, just as the paint tool 
does.
>
> The other use case for using the time is the airbrush. I looked at
> it time ago and looked again due this thread, first idea was
> checking the remaining of airbrush timer, but there seems to be
> none (yet?). It is required as airbrush stamps every X time, but if
> you move faster, the effect of time is ignored, getting stronger
> stampings than what really should happen.
>
> So no, there is no current use of velocity, but just cos it is not
> implemented, and thus nobody thinks about possible uses. Sounds a
> bit recursive. ;]

Ok - there is a velocity setting on the animated brushes, so we broke 
the recursion...we just need a volunteer to factor out the ink tool 
use of it, and implement a velocity calibration curve for the 
strokes.
:-)

>
> GSR
>
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