Re: Need Help With Libinput

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From	Gerhard Strangar <g.s@arcor.de>
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Subject	Re: Need Help With Libinput
Date	Wed, 3 Jul 2024 05:55:40 +0000
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Lester Thorpe wrote:

>         Coordinate Transformation Matrix (157): 0.400000, 0.000000, 0.000000, 0.000000, 0.400000, 0.000000, 0.000000, 0.000000, 1.000000
[...]
> 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.

You cursor movement is the vector you get when you multiply the matrix
with the input vector:

/x'\       /x\
|y'| = M * |y|
\1 /       \1/

The third dimension allows merging every possible transformation into a
single multiplication:

https://en.wikipedia.org/wiki/Affine_transformation#Image_transformation

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Need Help With Libinput Lester Thorpe <lt@gnu.rocks> - 2024-07-02 19:28 +0000
  Re: Need Help With Libinput Gerhard Strangar <g.s@arcor.de> - 2024-07-03 05:55 +0000
    Re: Need Help With Libinput Lester Thorpe <lt@gnu.rocks> - 2024-07-03 19:41 +0000

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