Grid in QGraphicsScene to fit in QGraphicsView while expanding

[phenom64]

Hi,

this time, when I drew 1000 squares grid with 1pixel each square, this doesn't fit in my GraphicsView,

I got blank scene... my screen resolution is around 1000 pixels, if I reduced to 800 squares, I got all my grid back.

What I don't understand is I can't draw more than 1000 pixels whatever my GraphicsView's size...

bellow 800 squares fit correctly in 300pixels GraphicsView's size
with 1000 squares all I got is blank even with 900 pixels GraphicsView's size(with my view expanded at maximum)
800.PNG

Any tips please ?