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Re: stippling or cross hatching in contour plot [message #56280 is a reply to message #56149]

Mon, 08 October 2007 09:08

pgrigis
Messages: 436
Registered: September 2007

Senior Member

Have you tried to use /cell_fill rather than /fill ?

Ciao,
Paolo

MA wrote:
> Hello David,
> thanks for your comments. Here's a very short piece of code to
> illustrate my problem.
>
> ;; create some data
> array=FindGen(100)
> array=Reform(array,10,10)
>
> Window,2
> loadct,2
> ;; contour data with color
> contour,array,levels=indgen(100),c_colors=indgen(100)+1,/fil l
> ;; try to put hatching on top
> contour, array,levels=[0,15,25],c_orientation=[45,-45,0],/fill,/
> noerase
> end
>
>> As usual with IDL contours, you can't let IDL choose the contours
>> for you. You have to choose them yourself, and the lowest one better
>> be conincident with the MIN(data) if you expect to make sense of
>> what you are doing. :-)
> I've done that
>
>
>> I don't see how it can erase the colors underneath, unless
>> you forget to use the NOERASE keyword.
> You were right, I forgot the NOERASE
>
> Still, the problem remains that c_orientation will apply its hatching
> to all levels above the ones specified. Run the code above and see
> what I mean. All levels above 0 are hatched at 45deg angle, all levels
> above 15 are hatched at 45 AND -45 deg angle, and all levels above 25
> are hatched at 45, -45 and 0deg angle. If I specify only one value for
> c_orientation=45, then the whole plot ends up being hatched at 45deg.
> I can't figure out how to hatch only between 0 and 15, or 15 and 25,
> for example.
>
> I've tried using POLYFILL instead, with the pattern keyword, and
> defining the pattern as a solid color for points where I don't want
> stippling, and defining the pattern as solid color with a couple of
> black dots where I do want stippling. It works, but the plot ends up
> being made up of lots of little squares, which doesn't look as smooth
> as the contour plot.
>
> I hope this explanation is a little clearer.
> Thanks!

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[Message index]

		stippling or cross hatching in contour plot By: MA on Fri, 05 October 2007 14:26
		Re: stippling or cross hatching in contour plot By: pgrigis on Mon, 08 October 2007 13:22
		Re: stippling or cross hatching in contour plot By: David Fanning on Mon, 08 October 2007 12:30
		Re: stippling or cross hatching in contour plot By: MA on Mon, 08 October 2007 11:48
		Re: stippling or cross hatching in contour plot By: David Fanning on Mon, 08 October 2007 09:47
		Re: stippling or cross hatching in contour plot By: David Fanning on Mon, 08 October 2007 09:28
		Re: stippling or cross hatching in contour plot By: pgrigis on Mon, 08 October 2007 09:08

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