URL:
<http://gna.org/bugs/?18570>
Summary: "Slow position tracking" makes odd hooks
Project: MyPaint
Submitted by: richterhuang
Submitted on: 2011年08月26日 20時48分59秒
Severity: 3 - Normal
Priority: 5 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: MyPaint 0.9.1+git(20110826)
Planned Release: None
Operating System: Ubuntu Linux 11.04
_______________________________________________________
Details:
Hi,
Please excuse me that I've already reported this
but in the incorrect manner yesterday.
I found that if I enabled "Slow position tracking",
brush often makes odd 'hooks' at the start of the stroke.
(and sometimes 'skips' like ink pens)
First of all, please take a look at this image.
http://dl.dropbox.com/u/38106202/mypaint-tracking_bug1.png
I simply drew straight lines repeatedly,
however there're odd hooks and skips.
This is more likely to appear when the parameter is higher.
In order to confirm this decisively,
you can gain the limitation of the parameter as beneath.
---------------------------
mypaint/brushlib/brushsettings.py
60c60
< ['slow_tracking', _('Slow position tracking'), True, 0.0, 0.0, 10.0,
_("Slowdown pointer tracking speed. 0 disables it, higher values remove more
jitter in cursor movements. Useful for drawing smooth, comic-like
outlines.")],
---
> ['slow_tracking', _('Slow position tracking'), True, 0.0, 0.0, 30.0,
_("Slowdown pointer tracking speed. 0 disables it, higher values remove more
jitter in cursor movements. Useful for drawing smooth, comic-like
outlines.")],
---------------------------
I'm not sure but I assume this may occur because
the interpolating algorithm uses a non-clicked coordinate as
the initial point of a stroke.
Additionally, if a skip appears, one stroke is devided into two by an undo.
http://dl.dropbox.com/u/38106202/mypaint-tracking_bug2a.png
I'm sorry that I sent the mail almost same as this post to the mailing list.
I wasn't aware enough of MyPaint's bug report system.
I use MyPaint 0.9.1+git(built on 20110826) on Ubuntu 11.04.
Sincerely,
Richter
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