[Interest] Synchronous painting on QGraphicsScene

[Christian Gagneraud]

On 7 October 2017 at 16:08, Patrick Stinson <patrickkidd at gmail.com> wrote:
> Hi there!
>
> I have a graph-ish diagram app where dragging some objects (like nodes) necessitates dragging other objects (like connecting edges). However, if I update an edge from the mouse event or ItemChanged(position) event then the edge isn’t painted until the next paint event. At times, this is quite obvious for example when nudging a node with an arrow key and the node is going in one direction and edge goes in the other direction for one frame because it is one buffer behind.
>
> Any thoughts on synchronous painting?

Have you check the "Elastic node"  example? It does exactly what
you're describing. And last time i tried it, it worked very well, no
painting artifact.
How is your "update"  done exactly?

Chris

>
> Thank you
> -Patrick
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