hi everyone, i am struggeling with the need to plot some 20kHz data on a scatterGraph. There should be some light colored plot for the latest data and a dark colored one for the older data. this works quite alright with two different plots with different historyCapacity values, but the old data should stay in the plot no matter how long the daq takes. in other words, i would need an infinite historyCapacity for plotting the old data. the thing is, the app get slower with growing historyCapacity Values. could it be that the whole plot gets redrawn every time causing the app to slow down when historyCapacity grows? i have a working version written in c++ (pointers etc.), but i cannot simply reuse it for obvious reasons. i tried a simple rewrite with pointers in c# without success. i also tried to use the Graphics.drawline method (no plot.append = no historyCapacity), but it is even slower. i wonder how measurement studio manages to achieve reasonable speed with low historyCapacity values... too bad one cannot learn from the source code. 😞 so, how can i have a fast daq app with an infinite plot of old data?

Measurement Studio for .NET Languages

endless plot without history

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hi nick,

your idea with the bitmap works, but performance is not too good. I will stop experimenting with c# and return to c++. it is much more complicated at least fast enough.

thanks anyway for taking the time!!

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Measurement Studio for .NET Languages

endless plot without history

Re: endless plot without history