How to paste a current curve shape to background of waveform graph

[nobuyuki]

I am a beginner of Labview and would like to ask about the waveform graph.

Now I am making a VI where there is a waveform graph to monitor data from a measurement equipment. Since dynamic data are connected to the waveform graph, plots appearing on the graph vary with time.

On this waveform graph, I would like to add a function as follows:

When I press a button, the plot at this timing is pasted to the background of the graph with different color so that we can clearly see the difference between the pasted plot and plots after that.

How can I do this?

[crabman]

One graph indicator can handle multiple plots. Your desired function could just copy the current plot with index 0 to a second plot with index 1. The styles of the plots can be adjusted independently.

Best regards!

[GerdW]

Hi nobuyuki,

you have several options:

- append the current plot as an additional plot to your graph data

- create an image of your plot and put this image as background image into the graph (using property nodes)

[nobuyuki]

Thank you for the quick reply!

I understand the idea, but I do not know how to implement it.

Could you please tell me more detail?

Actually, I have made a VI as attached, in which I take a current plot using "value" of the property node and merge it with the signal source data (when I press a button). It can paste a plot once into the graph but the plot disappear in the next while loop though I would like to keep it. I know why it disappear like this but I have no other idea how to do this.

Best regards,

nobuyuki

[Gregory]

Every time you write to graph it gets overwritten. That means if you want to keep seeing previous data you have to include it every time you write to the graph, not just once.

[Gregory · Accepted solution]

I'm personally not very familiar with dynamic data, but this should do the trick

[nobuyuki]

Thank you so much!

I finally can implement what I wanted to do in my VI.

Best regards,

nobuyuki