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Re: Use of Cursor [message #78914 is a reply to message #78912]

Wed, 11 January 2012 20:06

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Jan 11, 9:47 pm, singlebinary <singlebin...@gmail.com> wrote:
> Hello All,
>
> I am a beginner IDL user. I would like to make use of the cursor to
> read the x and y coordinates on a plot. I would like to read twice. I
> searched online and wrote a program of my own (see below). There are
> two problems with the program: (1) it does not give me the value on
> the plot but rather the pixel value; (2) it simply does not work
> unless I close the graphics window. It then outputs -1 -1.
>
> Please do guide me in this regard. Thanks!
>
> PRO cursor_use
> x = findgen(1000)*0.01
> y = sin(x)
> PLOT, x, y
> n = 2
> FOR i = 0, n-1 DO BEGIN
> CURSOR, x, y, /DEVICE, /WAIT
> PRINT, "This is cursor position", x,y
> PRINT, "Click again..."
> ENDFOR
> END

If you want pixel coordinates use /DEVICE, but if you want data
coordinates, then don't use /DEVICE.

Craig

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[Message index]

		Re: Use of Cursor By: David Fanning on Thu, 12 January 2012 05:43
		Re: Use of Cursor By: d.poreh on Thu, 12 January 2012 05:38
		Re: Use of Cursor By: David Fanning on Thu, 12 January 2012 05:32
		Re: Use of Cursor By: d.poreh on Thu, 12 January 2012 00:40
		Re: Use of Cursor By: Craig Markwardt on Wed, 11 January 2012 20:06

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