https://bugs.kde.org/show_bug.cgi?id=455627
Bug ID: 455627
Summary: Airbrush (Pixel Brush Engine - Color - Airbrush) cause
mismatch between holding angle and brush tip angle
when canvas is rotated
Product: krita
Version: 5.0.6
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Brush engines
Assignee: krita-bugs-n...@kde.org
Reporter: kousaki...@icloud.com
Target Milestone: ---
Created attachment 149938
--> https://bugs.kde.org/attachment.cgi?id=149938&action=edit
Recording of the mismatch
SUMMARY
Plz, refer to
https://krita-artists.org/t/when-the-angle-of-brush-tip-is-linked-with-actual-holding-angle-the-rotation-of-canvas-cuase-the-mismatch/42828
for a more explanatory description.
Using "WaterC Flat Decay Tilt" allows you to change the brush-tip angle by
changing your holding angle.
Consider holding the pen so that the projection of the pen parallels the
up\bottom edge of your tablet.
When you change your holding angle by creating a 30-degree angle between pen
projection and table edge,
the brush tip will rotate by 30 degrees. (30 can be replaced by any angle
between 0 and 360)
If we treat the "parallel" situation as 0-degree default, then, normally, when
the projection is paralleled with the tablet edge,
brush tip ('s direction, the default direction in this case) is paralleled with
the Krita application window's up\bottom edge.
This should be the desired behaviour.
But, when Pixel Brush Engine - Color - Airbrush is activated, the brush tip
will apply the rotation base on a default direction that is paralleled with the
canvas up\bottom edge, not the window's top\bottom edge.
STEPS TO REPRODUCE
1. Select WaterC Flat Decay Tilt as your brush
2. Rotate the canvas with a noticeable degree
3. Rotate your holding angle, and observe the mismatch.
OBSERVED RESULT
The angle of pen-holding and brush tip don't match.
EXPECTED RESULT
The angle of pen-holding and brush tip match.
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