From Newsgroup: alt.os.linux
Lester Thorpe wrote:
I desire a relatively slow pointing device (i.e. mouse) motion,
but with the now mandatory (i.e. no choice) libinput driver
under X Window I have a hard time understanding how to configure
the motion.
Using "xinput list" I discover that my pointing device is
device id=8.
Thus:
xinput list-props 8
....
....
Device 'PixArt Microsoft USB Optical Mouse':
Device Enabled (155): 1
Coordinate Transformation Matrix (157): 0.400000, 0.000000,
0.000000, 0.000000, 0.400000, 0.000000, 0.000000, 0.000000, 1.000000
....
....
The motion is apparently controlled by this "transformation
matrix," which seems to be 3x3 in size.
As seen above, I have what I assume to be the x and y motion
set to 0.4.
This does indeed slow the motion down.
But what do the rest of the values accomplish?
I can find no documentation on this issue. If someone can
provide links or a description it would be appreciated.
The
Coordinate Transformation Matrix in libinput is used to transform the
input coordinates from your device to screen coordinates
Here's a brief overview of what the values mean:
First Row: [0.4, 0, 0] - This row scales the x-axis movement
The value 0.4 means the x-axis movement is scaled down by a factor
of 0.4.
Second Row: [0, 0.4, 0] - This row scales the y-axis movement
Similarly, the value 0.4 means the y-axis movement is scaled down by
a factor of 0.4.
Third Row: [0, 0, 1] - This row typically remains unchanged and
ensures the transformation matrix is properly defined
.
If you want to adjust the matrix further, you can use the xinput
command to set new values. For example, to set a new transformation
matrix, you might use a command like:
sh
xinput set-prop 8 "Coordinate Transformation Matrix" 0.3 0 0
0 0.3 0 0 0 1
This command would further slow down the motion by setting the scaling
factor to 0.3 for both x and y axes.
This is a response to the post seen at:
http://www.jlaforums.com/viewtopic.php?p=668916285#668916285
--- Synchronet 3.20a-Linux NewsLink 1.114