How can I toggle left and right keys to scrolling on a waveform graph?

[sarahsrox]

I am working on a VI that records voltages from a DAQ and I need to be able to scroll left and right, back and forth through time using left and right keys. I am a beginner so please try to keep it simple, thank you!

[jcarmody]

You can use an Event structure (responding to Key Down) and a While loop to update the graph's X scale.

[sarahsrox]

Thank you so much for your reply! But what is the source for the stop? When I try to wire it to the event structure it acts like a sink.

[altenbach]

It is wired in the stop event case from the inside.

The picture is actually a snippet. Simply drag it to the diagram and it will turn into fuctional code.

[altenbach]

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@jcarmody wrote:

You can use an Event structure (responding to Key Down) and a While loop to update the graph's X scale.

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I would probably use an array of two elements simplifying the increment/decrement operations and eliminating half the SRs. Instead it needs an index array before the property nodes, no big deal. 😉

[jcarmody]

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@sarahsrox wrote:

Thank you so much for your reply! But what is the source for the stop? When I try to wire it to the event structure it acts like a sink.

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I wish LabVIEW had this as the default frame in an Event structure instead of Timeout; I use this more often.  This is cleaner than using a Stop button.