0.9 Interactive programming

The heart of interactive programming in G is the while loop . Any input control within the while loop can be modified from the Front Panel window at run time to provide seamless interaction with the G program.

In the Front Panel window, from the Functions>>Modern>>Numeric select the vertical pointer slide. From the Functions>>Modern>>Graph select Waveform Chart .

Re-label the vertical pointer slide as Amplitude and the waveform chart as Sine Wave . Re-arrange to GUI to look like the figure below.

Right click on Sine Wave and select Properties from the pop-up menu.

Select the Scales tab and change Maximum to 1023. Sine Wave will display 1024 samples.

Click on the down arrow located to the right of Time (X-Axis) and select Amplitude (Y-Axis) .

De-select Autoscale and change the Minimum and Maximum values to -10 and 10 . Click OK .

Rearrange Amplitude and Sine Wave terminals and finish the program as shown in [link] .

Scroll the mouse pointer over the Loop Control …

And right click on the Loop Control and from the pop-up menu select Create Control .

A stop terminal is created.

With the corresponding stop Boolean input control. Save the G program as Interactivity.vi .

Run the G program.

While the program is running, change the Amplitude and watch the graph update to reflect the interactive changes.

To end the G program, simply click on the stop button.

Congratulations. You have successfully completed and executed your first interactive G program.