How to make QGraphicsScene not move?

Question

Qt

Good people, tell me, when drawing on QGraphicsScene (QGraphicsView), the center of the scene moves in some way in accordance with the drawn element. I would like the initial center of the scene (coordinates 0,0) to remain stationary relative to the QGraphicsView widget when drawing. In English, not very good. strong, tried to find in the documentation but could not.

Answer 1

I don't have much experience with the scene, but try explicitly sizing it with setSceneRect

Answer 2

Almost.
jsfiddle.net/q0xn0fkr
PS Sorry for the broken link.