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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.
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In the Front Panel window, from the Functions »Modern »Numeric select the vertical pointer slide. From the Functions »Modern »Graph select Waveform Chart.
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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.
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Right click on Sine Wave and select Properties from the pop-up menu.
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Select the Scales tab and change Maximum to 1023. Sine Wave will display 1024 samples.
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Click on the down arrow located to the right of Time (XAxis) and select Amplitude (YAxis).
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De-selectAutoscale and change the Minimum and Maximum values to-10 and 10. ClickOK.
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Rearrange Amplitude and Sine Wave terminals and finish the program as shown in Figure Figure 8.9. Scroll the mouse pointer over the Loop Control...
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And right click on the Loop Control and from the pop-up menu select Create Control. A stop terminal is created.
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With the corresponding stop Boolean input control. Save the G program asInteractivity.vi.
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Run the G program.
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While the program is running, change the Amplitude and watch the graph update to reflect the interactive changes.
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To end the G program, simply click on the stop button.
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Congratulations. You have successfully completed and executed your first interactive G program.
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