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overlay a variable size box/rectangle over a incoming signal to indicate to user the area of signal being examined

im not sure if this is possible but .....

 

in a nut shell i would like to overlay a variable size box/rectangle over a incoming signal (XY Graph)

to indicate to the user the area of signal being examined

 

my code will take in the user input (the x axis values range). 

 

then draw a line up as far as the y value of the signal.

 

or a box or rectangle to show the user the area in question.

 

a shaded box would be cool but at this point im not that picky.

 

Any tips/pointers/ advice?

 

John

 

attached a quick sketch of what im trying to do.

 

 

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Create a picture indicator witha transparent background. Draw a yellow rectangle on it in the size you need and move indicator to the position you need.

 

Ton

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ill give it a go. thanks

 

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