# Pinch gesture on Ubuntu 18.04

**URL:** <https://discourse.vtk.org/t/pinch-gesture-on-ubuntu-18-04/7443>\
**Category:** Development\
**Created:** [December 21, 2021, 8:49am UTC](https://discourse.vtk.org/t/pinch-gesture-on-ubuntu-18-04/7443 "2021-12-21T08:49:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![syj](https://discourse.vtk.org/user_avatar/discourse.vtk.org/syj/32/7253_2.png) [@syj](https://discourse.vtk.org/u/syj)\
**Post date:** [December 21, 2021, 8:49am UTC](https://discourse.vtk.org/t/pinch-gesture-on-ubuntu-18-04/7443/1 "2021-12-21T08:49:57Z")

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Hi guys,  
I’m trying to use touchscreen on ubuntu 18.04. And my enviroment is as belows:

ubuntu 18.04  
QT 5.12.9  
vtk 9.1

I build the TouchGestureViewer example. Everything works fine, including single-touch, rotate, except the pinch gesture. No responding when I try to zoom the window using pinch.

I guess the window just do not recognize the multitouch gesture. But the pinch gesture do great for Chrome on Ubuntu 18.04, very fluent expeirence.

I tried the same example on Windows 10, and it works fine. Same situation for 3D slicer.

I know the multitouch is tested for Windows and Mac. But any one could give me any direction I should go deeper? Thanks very much.