Enabling multi-touch (pinch-to-zoom) in QtDragon HD with Touchscreen

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23 Feb 2026 22:01 #343371 by Ferra
Hello everyone,I hope this is not a trivial question — I am still learning the Linux input stack and QtVCP internals, so please excuse any misunderstanding on my side.I am running LinuxCNC with QtDragon HD (QtVCP) on Debian RT.
My touchscreen hardware supports 15-point multi-touch (confirmed on Windows).
On Linux, the device is detected as
wch.cn TouchScreen
.What I would like to achieve is:
  • Two-finger pinch for zoom in the 3D preview
  • Possibly two-finger rotation/pan gestures
​​​​​​​Any guidance, even high-level direction, would be greatly appreciated.​​​​​​​Thank you for your patience and for the excellent work on LinuxCNC.​​​​​​​​​​​

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