How to display a large signals with 10000 points on a screen?

[marc2050]

Hi.

I've a signal data that has 10000 points in it.
I like to display this signal data in Qpainter.
But on my screen, I only have a resolution of 1280 horizontally.
How do I squeeze this 10000 points into a display with 1280 resolution?
I tried a method in which I sample every other 7 samples so by the time I draw the last pixel, I'm almost at the 10000th points in my signals. But this method will make me miss out some peaks in the signals when I draw them. Is there a better way to achieve a good representation?

Thank you.
Marc

PS. I'm not sure if this question is entirely related to QT. Just wanted to know how other programmers do that in QT.

[aamer4yu]

Put ur painted widget inside a QScrollWidget and you can scroll through the points.

[Ginsengelf]

Hi, you can draw the minimum and maximum of a bunch of samples. That way you won't miss any peaks.

Ginsengelf