Review Request 120875: Krita - Fix proposal for brush speed sensor

[Wolthera van Hövell]

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I tested it and it works well, except the values would need to be 4x more sensitive to work on my wacom graphire 3. Might be different per device.

- Wolthera van Hövell


On Oct. 28, 2014, 11:10 p.m., Damien de Lemeny wrote:
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> https://git.reviewboard.kde.org/r/120875/
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> (Updated Oct. 28, 2014, 11:10 p.m.)
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> Review request for Calligra.
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> Repository: calligra
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> Description
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> This patch intends to fix the broken speed sensor of the brush tool.
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> It's based on a patch I got from Wolthera, which was discarded/unfinished because the output of the sensor remained "blobby".
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> I added a smoothing formula to the speed output :
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> output_speed = current_speed * 0.1 + last_speed * 0.9
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> The used numeric values are either eyeballed or wild guessed from usage. There's certainly room for improvements on this patch.
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> Diffs
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>   krita/image/brushengine/kis_paint_information.cc 264ad43 
>   krita/image/kis_distance_information.h 70fa25e 
>   krita/image/kis_distance_information.cpp 1c1c847 
>   krita/plugins/paintops/libpaintop/sensors/kis_dynamic_sensors.cc 6b10e2b 
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> Diff: https://git.reviewboard.kde.org/r/120875/diff/
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> Testing
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> I tested the ux of a speed bound preset before and after the patch and compared to the behaviour of a similar test brush in Mypaint.
> Results are noticeable improvements when painting strokes at different speeds with the fix.
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> It's also been tested by Wolthera
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> Thanks,
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> Damien de Lemeny
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