Multi-touch gestures: pinch-to-zoom not working

Usage & Issues
#1

Hello,

I am using QuPath version 0.2.3 on Windows 10 machine.
When ‘use zoom touch gestures’ ticked:

  1. zooming works fine when using touch screen
  2. zooming does not work when using touch-pad. Instead, pinching in/out changes overlay opacity of the annotations.

Does anyone know what might be causing this issue and how to fix it?

Also, I’d like to say that I love using QuPath and big thanks to Pete Bankhead for developing it and sharing it freely.

Kasia

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#2

Thanks Kasia :slight_smile:

The overlay opacity should change during scrolling while holding down the ctrl/cmd key. But if the shortcut key isn’t pressed, then it shouldn’t.

I’m afraid touch gestures can be a bit awkward, subject to exactly what computer / input device you are using (which is one of the reasons why they can be turned on/off – sometimes they are just quite frustrating). For example, on a Mac I might turn scroll gestures on if I am using a Magic Mouse but off if I’m using another kind of mouse, since they send QuPath different kinds of input notification. Some devices support scrolling left-to-right as well as up and down, while others require pressing shift to achieve that effect.

I’m limited in the range of devices I can test, and I’m not even sure it’s possible to access all the required information to fully support different devices in Java. Therefore I expect there isn’t an easy fix, and it is a matter of choosing which preferences are most comfortable for the devices you are using.

#3

Hi Pete,

Thanks for your prompt reply and clarification.
Yes, as you say, on my computer, the opacity overlay does change during scrolling while holding down ctrl. But it also changes when I pinch in/stretch out on my touchpad, without holding any key.

The pinch-to-zoom worked on an Apple touchpad + Apple computer last time I used it (a few weeks ago). But somehow it doesn’t on Windows. If I figure out a solution (maybe there is some Windows-specific quirk or some way around it), I’ll post it here.

All the best,
Kasia

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