Hi Krita developers,
I experienced Krita with Wacom Bamboo, it is awesome! it use bezior
curve to smooth the vibration when pressing or moving, for example, the
line 105 at
calligra/krita/plugins/paintops/curvebrush/kis_curve_paintop.cpp
https://projects.kde.org/projects/calligra/repository/revisions/master/entry/krita/plugins/paintops/curvebrush/kis_curve_paintop.cpp#L105
and Krita pay more attention to the end of point, it use curveOpacity to
smooth the QTabletEvent released event
http://leetcode.cn/sites/default/files/smooth-snapshot2.png
I tried to act like Krita`s
https://github.com/xiangzhai/tablet/blob/master/tabletcanvas.cpp#L209
but it is ugly ;(
http://leetcode.cn/sites/default/files/smooth-snapshot1.png
1. I use LINER pressure [.0, 1,0] to set pen`s width, perhaps Krita use
PARABOLIC CURVE pow(pressure, 0.125), but to a SLOW CPU, it is a heavy
operation? how to smooth pressure?
2. Krita use curveOpacity related with pressure, the same story as pen`s
width.
3. update partial region when the painter path is bezior curve, if
directly use update(), it is a heavy operation too, but how to set the
partial region?
Please someone give me some advice, thanks a lot!
--
Regards
Leslie Zhai
a KDE developer
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