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Re: making a circle of certain values [message #56131 is a reply to message #56130]

Mon, 01 October 2007 13:09

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

rpertaub@gmail.com writes:

> I have a set of data points (x,y coordinates) that can be plotted on
> my 1240,1024 array. However, they are sparse x,y spots across the
> image, and I want to 'thicken' it by drawing a circle with my x,y as
> centers. I want to give it a certain radius and a certain value too,
> so that the pixels in the circle (the filling) have values and can
> thus contribute to my rgb image...
> anyone know how to draw a circle, and assign a value to pixels within
> that circle?

I'd use the most useful routine I ever downloaded from the NASA
Astronomy library: TVCIRCLE.

You will probably have to write a new output keyword for that routine
to recover the XY locations of the polygon it creates for the circle.
Then use POLYFILLV to find the indices of the image inside that polygon.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: making a circle of certain values By: Craig Markwardt on Wed, 03 October 2007 01:42
		Re: making a circle of certain values By: David Fanning on Tue, 02 October 2007 09:33
		Re: making a circle of certain values By: Loren Anderson on Tue, 02 October 2007 09:30
		Re: making a circle of certain values By: David Fanning on Tue, 02 October 2007 08:43
		Re: making a circle of certain values By: Loren Anderson on Tue, 02 October 2007 08:24
		Re: making a circle of certain values By: Jean H. on Mon, 01 October 2007 13:21
		Re: making a circle of certain values By: David Fanning on Mon, 01 October 2007 13:09

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