[Wayland-bugs] [Bug 101474] [PATCH] doc: Fix mistake in Matrix example to relect only X along Y axis

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101474

            Bug ID: 101474
           Summary: [PATCH] doc: Fix mistake in Matrix example to relect
                    only X along Y axis
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: rzr at users.sf.net

Subject: [PATCH] doc: Fix mistake in Matrix example to relect only X along Y
 axis

On some devices, X coordidate is not working well, as if it was swapped,
(click on right, appear on left and vice versa).

To sort this issue, coordidates should be reflected on Y axis:
- new X prosition is changed (width is substracted by X position)
- Y is unchanged (the mistake was here, it was set to X)

In landscape (or portrait) mode:

                [ x ]
                [ y ]
                [ 1 ]
              *
  [ -1 0 1  ]   [ x' ] = -x + 0*y + 1*width
  [  0 1 0  ]   [ y' ] = 0*x + 1*y + 0*height
  [  0 0 1  ]   [ 1  ]

This was verified using this touch screen.

  E: ID_VENDOR=eGalax_Inc.
  E: ID_VENDOR_ENC=eGalax\x20Inc.
  E: ID_VENDOR_ID=0eef

Origin:
https://github.com/TizenTeam/libinput/tree/sandbox/pcoval/on/master/review

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