URL:
<http://gna.org/bugs/?20405>
Summary: Under rare circumstances first stroke drawn
incorrectly
Project: MyPaint
Submitted by: zrzz
Submitted on: Fri 04 Jan 2013 10:37:34 AM GMT
Severity: 2 - Minor
Priority: 5 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 1.1.0@git 1635035
Planned Release: None
Operating System: Lubuntu 12.10/Compiz
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Details:
1) start mypaint
2) Do NOT move mouse.
3) From current position very quickly draw line with mouse
4) Mypaint might add unexpected hook to the beginning of the line. (see
screenshot: I've drawn vertical line, diagonal line was added by mypaint)
AFAICT this happens due mypaint-brush.c\ mypaint_brush_stroke_to due its usage
of states at line 790:
x = self->states[MYPAINT_BRUSH_STATE_X] + (x -
self->states[MYPAINT_BRUSH_STATE_X]) * fac
fac is calculated from dtime and slow position tracking setting of brush(In my
case it is 1.03 of deevad/pen).
Upon initialization states are zeroed, so calculated value is lower than it's
supposed to be.
If mouse is moved before drawing, then motion_notify_cb at canvasevent.py:519
will call stroke_to with zero pressure, so coordinate states will be updated.
However if stroke_to with pressure is called immediately without moving mouse,
then weird thing might happen
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Fri 04 Jan 2013 10:37:34 AM GMT Name: screenshot.jpg Size: 50kB By:
zrzz
<http://gna.org/bugs/download.php?file_id=16895>
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