Bug 144771

Summary:	Wacom pressure increases brush spacing
Product:	[Applications] krita	Reporter:	Heikki Ulmanen <hulmanen>
Component:	General	Assignee:	Halla Rempt <halla>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Heikki Ulmanen 2007-04-28 00:49:02 UTC

Version:            (using KDE KDE 3.5.6)
Installed from:    Ubuntu Packages
OS:                Linux

Whenever I draw a brushstroke using wacom at full pressure, I can clearly see the individual stamps that comprise the stroke, even if spacing is set to 0. Decreasing pressure mitigates the issue, and at lower pressures the spacing is fine. Spacing seems to increase with brush pressure. Lines drawn with  mouse are fine.

Comment 1 Halla Rempt 2007-05-22 08:16:27 UTC

Not sure what's going on here, since I cannot reproduce it. Do you have any special settings for your tablet in your xorg.conf to modify the pressure curve?

Comment 2 Heikki Ulmanen 2007-05-22 10:43:52 UTC

Nothing special, but here is the relevant xorg.conf section anyway:

(I had some stuff that wasn't in your example xorg.conf, which I commented out for testing, but even with the following config I still get the spacing issue.)

Section "InputDevice"
  Driver        "wacom"
  Identifier    "stylus"
  Option        "Device"        "/dev/input/wacom"          # Change to 
                                                      # /dev/input/event
                                                      # for USB
  Option        "Type"          "stylus"
#  Option	"USB"		"on"
#  Option 	"Twinview" 	"horizontal"
#  Option	"ScreenNo"	"2"

EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "eraser"
  Option        "Device"        "/dev/input/wacom"          # Change to 
                                                      # /dev/input/event
                                                      # for USB
  Option        "Type"          "eraser"
#Option	"USB"		"on"
EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "cursor"
  Option        "Device"        "/dev/input/wacom"          # Change to 
                                                      # /dev/input/event
                                                      # for USB
  Option        "Type"          "cursor"
# Option	"USB"		"on"
EndSection

Section "InputDevice"
  Driver        "wacom"
  Identifier    "pad"
  Option        "Device"        "/dev/input/wacom"          # Change to 
                                                      # /dev/input/event
                                                      # for USB
  Option        "Type"          "pad"
# Option	"USB"		"on"
EndSection

Comment 3 Halla Rempt 2007-05-22 10:51:40 UTC

What's the type of your tablet? Is it serial or usb?

Comment 4 Cyrille Berger 2007-05-22 19:54:01 UTC

I can reproduce with a Wacom Intuos3. But to see it clearly, I need to increase the brush size.

Comment 5 Halla Rempt 2007-05-24 19:33:47 UTC

Fixed in 1.6 branch; however, it's not exactly a clean fix. For 2.0 we will have to make sure the line between event points is drawn by the paintop, not the brush tool.

Comment 6 Halla Rempt 2007-06-22 15:24:26 UTC

Cyrille, you have moved the paintline to the paintop -- is this bug now finished?

Comment 7 Halla Rempt 2007-06-22 16:02:44 UTC

Nope, Cyrille hasn't fixed it yet -- I'll do that.

Comment 8 Halla Rempt 2007-06-23 21:55:19 UTC

SVN commit 679373 by rempt:

BUG: 144771
Cyrille's changes did make it easier to fix, after all. This should be
correct, but it needs testing once I've got my tablet working again.


 M  +2 -2      image/kis_painter.cc  
 M  +4 -3      image/kis_paintop.cc  
 M  +56 -56    image/kis_paintop.h  
 M  +21 -0     plugins/paintops/defaultpaintops/kis_brushop.cc  
 M  +4 -0      plugins/paintops/defaultpaintops/kis_brushop.h  
 M  +72 -72    ui/kis_tool_freehand.cc