Setting up a user interface

Again, for this example, we will create a new Qt Widget Application. After that, open up mainwindow.ui and add a menu bar to the main window. Then, add the following options to the menu bar:

We have three menu items on the menu bar—File, Brush Size, and Brush Color. Under the File menu are functions for saving the canvas into a bitmap file, as well as clearing the entire canvas. The Brush Size category contains different options for the brush size; last but not least, the Brush Color category contains several options for setting the brush color.

You can go for something more paint-like or Photoshop-like for the ...

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