Two background colors for the same waveform graph

[Keno]

Hello guys!

I got a question for you: i'm a new user of labview, so please be nice!

So here's the deal: I just created a program recording the temperature thanks to 4 thermocouples.

In real time, I got then in a waveform graph 4 curves as soon as I start my program. And in my program, I got a button which allows me to record the temperature in a file for a certain period at a certain frequency.

So, what I'd like to do is: I got my waveform graph with a black background for example, and once I pushed the button, the background color will be changed automatically to highlight the part of the graph where the recording occurs, then the background will return to  black once the recording completed. In this way, on the same graph, I could say that the recording occured from there to there by looking at the graph. I would have two different background on the same graph.

I know how to change the background of a graph by using property node but is it possible to do what I want to ?

I hope I am clear. If not, please don't hesitate to ask me further details...I could post my vi if necessary

Cheers

[H_SH]

Hey,

I don't think it is possible as per my experience in the same way as u want, there can be other way to do but before that i need some more input from your side...

How is plotting going on ur graph, are u appending new value to old values to show long plots on same graph ?.. if yes then upto how much points, r u using collector to show only some fixed number of recent points on plot ?

do u want it only for front panel display for user or you want to save whole length plot showing the background color changed on your report ?

please reply with above points.. if u post vi then version conflict may occur as i and many others may still be using 8.5.. u can save it in older version before posting or image file..

u can wait little may be some body did same wat u r asking, in that case i will also learn ..

Thanks

HS

[Keno]

Hello,

the best way to answer to your questions is sending my vi.

So here it is.

Thanks a lot by the way for your help

[Keno]

Anyone?

If it is not possible, maybe it is possible to mark a part of the graph by two vertical lines, the fisrt one marking the start of the recording and the second one the end of the recording...

[Cory_K · Accepted solution]

Well I know this isnt exactly what you want to do, but you could try the following.

Change the color of the line on the graph when recording occurs.

So you could have a red line, then press record, then it changes to blue, then back to red.

Or if that gets confusing since you have 4 different lines on 1 graph,

you could change from a red solid line to a red dashed line and back, for example.

Would that be okay? If so, I can show you how to do that. 

[Ben]

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Keno wrote:

Anyone?

If it is not possible, maybe it is possible to mark a part of the graph by two vertical lines, the fisrt one marking the start of the recording and the second one the end of the recording...

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Add two cursors and set them when the data starts and ends.

You could also play games with extra channels and using the fill to option use those to give you the changing background.

So it can be done either way.

Ben

[Ben]

Quick outiline of the abckground idea.

1) Plot 1 is the data

2) Plot 2 is used to ID the "before" part. For every value shown on plot 1 add a value for this plot that is far above thrange of the graph. Set it for zero-fill or fill to negative infinity.

3) When recording is active put "NaN" into plot 2. NaN will not plot and will not fill.

4) similarly for the "after" stuff.

plots generally will plot from back to fron max plot number to min plot number.

THat should be enough hints.

Ben

[Keno]

Sorry , the problem is not solved yet...

Actually, Cory K, I'm quite interested by your solution. If you can explain to me how to do to that, that would be much appreciated (I'm talking about the part with solid and dashed lines)

As for Ben, I'm not sure I have well understood your solution. If you got an example, maybe that could save my problem...

Thanks anyway for all your answers

[Ben]

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Keno wrote:

Sorry , the problem is not solved yet...

Actually, Cory K, I'm quite interested by your solution. If you can explain to me how to do to that, that would be much appreciated (I'm talking about the part with solid and dashed lines)

As for Ben, I'm not sure I have well understood your solution. If you got an example, maybe that could save my problem...

Thanks anyway for all your answers

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Sorry I'd get fired if I actually posted something useful.

Ben

[Keno]

What do you mean by "you'd get fired" ? Are you joking ?

Cory K, I'm thrilled to hear your solution....