Zoom graph with keyboard

[pat777]

Hi All,

How can I zoom or pan a graph using the keyboard instead of the mouse?

Cheers

Patrick

[DBerry · Accepted solution]

Patrick,

I don't believe there is a property/method you can access to do this but it is possible.  I would suggest capturing the key down event using an event structure and then modfiying the graph x and y scale ranges by some increment to either zoom in or zoom out.  This can be done by writing to a property node (X Scale - Range - Maximum/Minimum). You will want to control the loop rate appropriately to achieve a reasonable speed of zooming.  

Dan

[pat777]

Hi Dan,

Thanks for you answer, working with the property nodes, X / Y Scale Range Maximum / Minimum, did the job.

To capture the pressed key I am using the Initialize Keyboard.vi, Acquire Input Data.vi (shipped with LabView) and a

Index Array wired into a case structure. Depending on what I want to do, Zoom In / Out or Pan left / right, I am increasing

or decreasing the Scale Maximum / Minimum.

Cheers

Patrick