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Re: Overplot grid [message #86429 is a reply to message #86428]

Thu, 07 November 2013 11:20

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Jordan Guerra writes:

> Let us say I have an image and I divide that image in a 100x100 square
pieces of the same size. How can I overplot a a grid to this image in
which I highlight an specific subfield? I mean, if I have some other
plot that I calculated from the subfield (X,Y) and I want to be able to
locale and frame that and only that location in the whole image, so I
can see any particular feature within this rectangle.
>
> Any idea?

Here is a grid cell overlayed with a gray-scale transparency to call
attention to it. You can change the value of the Transparent keyword
to make it more or less prominent:

image = Congrid(cgDemoData(18), 50, 50)
cgDisplay, 500, 500
cgLoadCT, 4, /Brewer, /Reverse
cgImage, image, XRange=[0,10], YRange=[0,10], /Save
FOR j=1,9 DO cgPlotS, [0,10], [j,j], Color='Navy'
FOR j=1,9 DO cgPlotS, [j,j], [0,10], Color='Navy'
cgImage, image[35:39,25:29], XRange=[7,8], YRange=[5,6], /Overplot, $
Transparent=25, CTIndex=0
END

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Overplot grid By: Jordan Guerra on Thu, 07 November 2013 11:00
		Re: Overplot grid By: David Fanning on Thu, 07 November 2013 11:20
		Re: Overplot grid By: David Fanning on Thu, 07 November 2013 11:35

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