Position of QGraphicsItem on Scene.

[anda_skoa]

That doesn't even make sense. Now you not even attempting to update the line item anymore.

The ellipse items need to update the position of the line item, so they need the line item.

But instead of your previous attempt of changing some random temporary line value, you need to update the line item's value.

Lets have a look at some C++ basics

int a = 5;
int b = a;
b = 3;
// which value does a have?

int a = 5;
int b = a;
b = 3;
// which value does a have?

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Cheers,
_