How to draw a box under a trace of waveform?

Hi all

I have a graph of waveform of 3000 point showing a series of peaks.  For one of these peaks, for which I know the beginning and end clues, I would draw a box under the waveform on the graph, to highlight its position programmatically.  I don't know if there is a way to do it.

I figured out how to draw cursors at the beginning and at the end, but finally I do for multiple peaks, and forest of cursors quickly becomes confused.  A simple shaded box works much better.

Any ideas?

Many thanks in advance,

RipRock99

A great thank you GerdW!

The code LV was very close to what I wanted to do and is easy to use to determine how to make my code produces the result I wanted.  Basically, I added another form of wave to my chart, using my known indices x to set the values of Y for the areas I wanted to be gray as + infinity and leaving the rest to =-infinity.  I then plotted this second graph on top of the original waveform and the property node to set the fill indicator for - infinite.

That does not answer the general question of how to draw a filled rectangle with the coordinates on a graph, but this does not fix what I wanted to achieve.

Bravo and thanks,

RipRock99

PS: I'm including a preview of the result and a snapshot of the code used to define the property node programmatically.  I do not understand my code just as it is complicated, and I would also need to add a large set of data.  I hope that the pictures are enough to help someone else referencing this Council!

Tags: NI Software

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