I’m working on a pixel art drawing software.

Following this tutorial, I wrote a little program with a QGraphicsView, and a paint function within a class that inherits QGraphicsItem, that can paint to that QGraphicsView. But here’s where I’m confused. If I say:

im trying to create a selection rectangle over a graphicsView widget but the rectangle thats created is all offset and moves the initial image previous putted in there. The program basiclly uses the left and right click of the mouse, both set coordinates and draw a rectangle.