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Re: Object graphics color scattergram [message #25449 is a reply to message #25447]

Wed, 13 June 2001 21:35

davidf
Messages: 2866
Registered: September 1996

Senior Member

Jeffrey R. Hall (jeffrey.r.hall@jpl.nasa.gov) writes:
>
> In IDL object graphics, how does one do a scatter plot where
> the points are colored by some set of values? Here is an
> example using direct graphics:
>
> DEVICE,PSEUDO=8
> seedx = !pi
> seedy = !pi ^ 2
> x = BYTSCL(RANDOMU(seedx, 100, GAMMA=1))/255.0
> y = BYTSCL(RANDOMN(seedy, 100, GAMMA=1))/255.0
> z = BYTE( x * 255 )
> LOADCT,15
> PLOTS,x,y,COLOR=z,PSYM=1,LINESTYLE=6
>
> I have tried IDLgrPlot with and w/o IDLgrSymbol, and also
> IDLgrPolyline. Lines can be colored, even faded from one
> vertex to the next. But if the lines are omitted then no
> points are drawn, and if IDLgrSymbol is used then they are
> all the same color.
>
> Plus, I need this to be in 24 bit color rather than PSEUDO=8.

I think you just didn't happen onto the correct sequence
of polylines and symbols. Here is an example of an
object graphics scatterplot that I cobbled together
some time ago from my SIMPLE_SURFACE code.

ftp://ftp.dfanning.com/pub/dfanning/outgoing/misc/scatter_su rface.pro

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Object graphics color scattergram By: Jeffrey R. Hall on Thu, 14 June 2001 14:52
		Re: Object graphics color scattergram By: m.hadfield on Wed, 13 June 2001 21:06
		Re: Object graphics color scattergram By: davidf on Wed, 13 June 2001 21:35

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