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Object graphics color scattergram [message #25450]

Wed, 13 June 2001 17:57

Jeffrey R. Hall
Messages: 5
Registered: June 2001

Junior Member

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.

Thanks in advance,

Jeff

--
Jeffrey.R.Hall@jpl.nasa.gov (818)354-4249
Member Technical Staff, Science Data Processing Systems, Section 388
Jet Propulsion Laboratory, Pasadena, CA 91109, Mail Stop 168-415
http://www-dial.jpl.nasa.gov/~jeff

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Object graphics color scattergram

By: Jeffrey R. Hall on Wed, 13 June 2001 17:57

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