URL:
<http://gna.org/bugs/?21735>
Summary: Tilt value varies (incorrectly) with ascension
Project: MyPaint
Submitted by: briend
Submitted on: Sun 02 Mar 2014 05:44:45 AM UTC
Severity: 3 - Normal
Priority: 5 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 1.1.0+gite443277
Planned Release: None
Operating System: Linux
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Details:
I created a brush that varies the radius with the declination (tilt). I
noticed that as I hold the pen in different orientations the brush responds
differently, as if the tilt is being reported as more or less depending on the
ascension/bearing.
I verified with the output of xinput that my intous5 pro was reporting tilt
values from -63,-63 (NorthWest) to 63,63 (SouthEast). Although at those
extreme angles the nib was not able to make contact with the pad so in
practice values of only up to 55 are possible.
Attached is a sample. You can see a pattern where the North and South
directions are the biggest (indicating the biggest tilt value). East and West
are both small, and other other four directions are all the same and they
happen to be on the 45 degree marks. I've looked at the src code but I'm
afraid I'm not great at math and trig. Doh!
I can't imagine why no one has noticed this except that maybe everyone just
holds their pen at one orientation?
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File Attachments:
-------------------------------------------------------
Date: Sun 02 Mar 2014 05:44:45 AM UTC Name: weirdbrushtilt.jpg Size: 134kB
By: briend
<http://gna.org/bugs/download.php?file_id=20230>
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Reply to this item at:
<http://gna.org/bugs/?21735>
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