A simple library to make touch screen input on linux easily available to applications made in Unity etc. Can also be used in any other programming env, as a wrapper around reading events directly.
Magic Touchscreen uses libevdev for input events, so
install libevdev-dev on Ubuntu, or the corresponding
package on your distro.
Run make
Mark the magicts_test.cpp as executable by running
chmod +x magicts_test.cpp, and then execute it. It will
compile the library and make use of it to run a simple test
program. You should see touch events printed to the terminal,
simillarly to the evtest program available in some linux distros.
Note that the running user must be part of the input group, or the application must be run using sudo.
Magic Touchscreen has a simple interface of three
functions:
magicts_initialize, magicts_update, and magicts_finalize
The first and last sets up and frees the touch screen context. Magic Touchscreen searches through a list of candidate input event files (/dev/input/eventX) and looks for a file it can open and that supports ABS_MT events. It chooses the first available file that matches.
The update calls fills and returns a TouchData struct that holds info on up to 100 touches.
Magic Touchscreen does not support pressure or tilt/angle, simply position and up/down for each touch
The TouchData uses a normalized coordinate system with origo at the top left corner relative to the screens native orientation. Flipping and/or swapping axes is up to the client application.