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Re: color and tvellipse [message #75630 is a reply to message #75629]

Tue, 15 March 2011 14:10

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Gray writes:

> I want to draw a number of ellipses with TVEllipse, and have the color
> of each ellipse correspond to one of the colors in a discrete
> colorbar. I'm using CG, so I created the plot with cgPlot, /nodata...
> then I loaded the color table with cgLoadCT, and created the colorbar
> with cgDCBar. However, when I try to use the color indices with
> TVEllipse, they all are plotted in black. Any suggestions?
>
> Here's my code:
>
> cgplot, indgen(3), /nodata, xra=[x0,x1], yra=[y0,y1],$
> xst=1, yst=1, charsize=1.25, xtitle='Right Ascension (hours)', $
> ytitle='Declination (hours)', title='Survey Extent', $
> position=[0.1,0.1,0.85,0.9]
> for i=0,nd-1 do $
> cgplots, ra[*,i], dec[*,i]
> for i=0,nr-1 do $
> cgplots, ra[i,*], dec[i,*]
> cgloadct, 25, /brewer, ncolors=12, bottom=1
> cgdcbar, ncolors=12, bottom=1, color='navy', $
> labels=themonths(/abbrev),/vertical
> for i=0,nday-1,10 do tvellipse,3,45,ra0[i],dec0[i],0,months[i],/data

I guess "months[i]" must be the "color". I don't
know what is in there, but if it is a number, I
would make it a color like this:

color = cgColor(StrTrim(months[i],2))

Cheers,

David

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

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[Message index]

		Re: color and tvellipse By: Gray on Tue, 15 March 2011 16:21
		Re: color and tvellipse By: David Fanning on Tue, 15 March 2011 14:29
		Re: color and tvellipse By: Gray on Tue, 15 March 2011 14:16
		Re: color and tvellipse By: David Fanning on Tue, 15 March 2011 14:10

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