Painter example Undo/Ctrl-Z

Heads up! You've already completed this tutorial.

Paapu | 2020-05-10 20:21:13 UTC | #1

I tried to figure out how to cancel a part of a drawing (using subsequent ctrl-Z or something). Would this be doable? (I could not make it...)


martin | 2020-05-10 20:22:07 UTC | #2

Hi @Paapu it should be! One simple way would be to take a snapshot of the current pixmap canvas on every mouse down (start drawing) and store this in a temporary variable. Then when Ctrl-Z is pressed (detected using a QAction) you can copy that back over the current canvas.


Over 10,000 developers have bought Create GUI Applications with Python & Qt!

To support developers in [[ countryRegion ]] I give a [[ localizedDiscount[couponCode] ]]% discount with the code [[ couponCode ]] — Enjoy!

For [[ activeDiscount.description ]] I'm giving a [[ activeDiscount.discount ]]% discount with the code [[ couponCode ]] — Enjoy!

Well done, you've finished this tutorial! Mark As Complete
[[ user.completed.length ]] completed [[ user.streak+1 ]] day streak