How to draw some objects one by one instantly?

[weixj2003ld]

I draw some objects with QGraphicsView and QGraphicsScene one by one ,before draw each of them , there are many data to compute.I want that after compute the demand data of drawing one object,the object was drawn instantly.But I find that during all the data being computed,none object was drawn,and all the objects are drawn together after all the data have been computed.

[high_flyer]

You will have to change your code so that it will draw each item after the data for it was computed.