Painting of lots of computationally heavy pixels

[JohannesMunk]

If you use your own custom widget for the painting.. you won't need the displayimage, necessarily. Just drawPixmap the heatimage on the widgets painter. and then directly draw your circles. Does that work?

LUT: Well it adds up. And it depends on how often you need to refresh your heatimage. But it seems pretty stationary in your case. So forget about it. I had 2560x1600 realtime changing pixels where it made a BIG difference..

[Cruz]

Yes it does work.

Well, maybe after everything else is done I will tinker with the LUT and see how much it does. But I doubt it will be noticable. Compared to the 300k times 1 ms for each pixel of the heat map, reducing 300k linear interpolations to 10k look ups is most likely less than 0.1 percent of the total runtime.

Thanks for the help mate! We put this thing together in less than two hours.

[JohannesMunk]

Well it went that fast because you didn't need any help implementing. Good work!

BTW: If you want to do me a favour, use the forums thanks button, once :->

Bye!

Johannes