| Re: filled closed curve [message #25538] |
Thu, 28 June 2001 08:10 |
Andy Loughe
Messages: 174
Registered: November 1995
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Senior Member |
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Jochen Weller wrote:
>
> Hello
>
> I am relatively new to IDL and have the following question.
>
> I have a data file which contains the x and y coordinate of a closed
> curve. I would like to shade the area inside the curve with a different
> color.
> Does anybody know how to do this ?
Is this what you are looking for...
;; Color 0=black, 1=gray, 2=white
tvlct, [0,130,255], [0,130,255], [0,130,255]
!p.background=2 ;; white background
contour, dist(30), levels=[10, 20, 30]
contour, dist(30), levels=[0,20,30], c_color=[1,0], /over, /fill
Andrew Loughe =====================================================
NOAA/OAR/FSL/AD R/FS5 | email: loughe@fsl.noaa.gov
325 Broadway | wwweb: www-ad.fsl.noaa.gov/users/loughe
Boulder, CO 80305-3328 | phone: 303-497-6211 fax: 303-497-6301
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| Re: filled closed curve [message #25541 is a reply to message #25538] |
Thu, 28 June 2001 07:29  |
btt
Messages: 345
Registered: December 2000
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Senior Member |
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Hi,
To shade the polygon on the current display (assuming you are using
direct graphics), try the POLYFILL procedure. You should set up a
coordinate system before calling POLYFILL unless you want to draw
directly in device (pixel) coordinate space.
Something like:
PLOT, X, Y, /NoData, /YNoZero, ...
POLYFILL, X, Y, Color = myColor, /Data
Ben
Jochen Weller wrote:
>
> Hello
>
> I am relatively new to IDL and have the following question.
>
> I have a data file which contains the x and y coordinate of a closed
> curve. I would like to shade the area inside the curve with a different
> color.
> Does anybody know how to do this ?
>
> Cheers
> Jochen
>
> ************************************************************ ******************
> * Jochen Weller Tel. +44 1223 337941 *
> * D.A.M.T.P. Fax: +44 1223 765900 *
> * Centre for Mathematical Sciences *
> * University of Cambridge www: www.damtp.cam.ac.uk/user/jw249/ *
> * Wilberforce Road e-mail: J.Weller@damtp.cam.ac.uk *
> * Cambridge, CB3 0WA *
> * U.K. *
> ************************************************************ ******************
--
Ben Tupper
Bigelow Laboratory for Ocean Sciences
180 McKown Point Rd.
W. Boothbay Harbor, ME 04575
btupper@bigelow.org
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