How can i draw picture with Qpen

[akkarachai]

I have the picture this13292 and How can I draw picture with free hand on it's?
like this13293

:)

[d_stranz]

Did you look at Qt's Scribble (https://doc.qt.io/qt-5/qtwidgets-widgets-scribble-example.html) and Image Viewer (https://doc.qt.io/qt-5/qtwidgets-widgets-imageviewer-example.html) examples? You should think about how you can combine the concepts in these two examples to capture mouse movement and use those to change pixels on a QImage or QPixmap.