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user-defined plot markers in IDL [message #263] Fri, 13 March 1992 09:52
hunt is currently offline  hunt
Messages: 3
Registered: September 1991
Junior Member
I need 15 plot marker symbols for a series of plots (don't worry--they won't all
be used on one plot, but we want to assign each data group it's own symbol for
consistency across plots). What I have done is to define my own circle, square,
triangle, diamond, and delta (upside-down triangle) and render them in "white"
(just outlined), black and gray.

I am using the usersym IDL routine so I get black by specifying /fill, white by
not using /fill, and gray by using /fill and setting a color value from the gray
scale.

The problem is that the filled symbols are just filled, not outlined (with usersym it's either filled or outlined--I don't see a way to do both) and the gray
symbols are dot patterns that are not consistent when the symbol is drawn many times. And the gray symbol dot patterns look like they may not reproduce well.
What I would really like to do would be to outline the gray symbols--I think that
would be a satisfactory solution. But I can't figure out how to do this in IDL.

Does anyone have:

a way to outline the gray symbols
another way to define plot markers in IDL
a good set of plot markers

Thanks for your help.

Linda Hunt
hunt@uadp1.larc.nasa.gov
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