How to select a set of points in a xy graph contained in an area draw with the cursor ?

Question

I'm using tIhe XY graph to plot a Pointcare representation of RR intervals (heart beat). I would like to use the mouse to draw a polygone surrounding the points of interest and get their indexes from the original array. Thank you to oriented me to some strategy!
Olivier 
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Answer 1

This can be done, but unfortunately is not trivial. Since this is the second request I have seen in the last week for this type of functionality, I would encourage you to post the idea to the LabVIEW Idea Exchange.
All graphs have a front, middle, and back image, which is set using a picture control data type.  You can use this to draw your cursor using an unfilled rectangle.  You can capture mouse events on the XY graph using the event structure, and update your enclosed rectangle (or ellipse, or whatever you would like to draw) when the mouse moves.  You can extract the enclosed data points from your original data set when a mouse up event occurs or when the user clicks inside the rectangle after drawing it.  You may also want to include ways to tweak the boundaries of the rectangle.
This is relatively straightforward if you have used the event structure before, but could be very confusing if not.  Let us know if you need more information or help.
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