Detect X-axis value from a mouse click in a chart

[Marcelonobre]

Hi!

I'ts the first time i'm posting a question in the NI forum, so i hope i'm doing it right.

I'm using labview 2012 and I'm Trying to create and store timestamps from a real-time Aquired Data. I have a chart that display the voltage aquired from a NI USB-6343 X series on the Y-axis with the Absolute Time on the X-axis. Then the user must click on the chart and display a option for creating a timestamp with the x value from the place that were clicked and a name to that instant. 

I'd apreciate any help.

Best Reagrds

Marcelo Nobre

[erick.yamamoto]

Hi Marcelonobre. How are you?

So I found a documentation similar. See if its what you need.

How Do I Coordinate Cursor Movement on a Waveform Graph in LabVIEW?

http://digital.ni.com/public.nsf/allkb/191A70953A91663D862574F00057423D?OpenDocument

Regards.

[Marcelonobre]

Hi Erick.

Thanks for the fast reply!

Is there a way to do it on a Waveform Chart? Because i'm aquiring the data on real time and the Waveform Graph, as far as i know, doesn't support that. Is there a way to do it on a WaveformChart?

Best Reagards

Marcelo

Ps.: Vou ver o forum em portugues! 🙂

[erick.yamamoto]

Hi Marcelo.

In the Waveform Chart is not possible. Because the cursor function only has in he Waveform Graph.

Regards.

[GerdW]

Hi Marcelo,

you can use an event structure to detect a mouse click on the chart. Then you could use a method of the chart to calculate XY coordinates from mouse coordinates: