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Using VERT_COLORS=RGBA in PLOT()? [message #88569]

Tue, 13 May 2014 09:27

dg86
Messages: 118
Registered: September 2012

Senior Member

Dear Folks,

I am trying to create a scatter plot in IDL 8.3 (MacOS)
whose symbols have different colors and alpha values.
The documentation for plot() suggests that I should be able to pass a 4 x NPTS array of
RGBA values to the VERT_COLORS property of plot(), where NPTS is the number of points in
my data set. When I try this, IDL complains:

% PLOT: Array subscript for PALETTE must have same size as source expression.

Here's a minimal example:

npts = 10
a = findgen(2,npts)
rgb = bytarr(3,npts)
p1 = plot(a, vert_colors=rgb) ; works
p2 = plot(a, vert_colors=rgba) ; doesn't work

I'd be grateful for pointers on how to set the transparency of individual vertices
in a plot.

Many thanks,

David

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[Message index]

		Using VERT_COLORS=RGBA in PLOT()? By: dg86 on Tue, 13 May 2014 09:27
		Re: Using VERT_COLORS=RGBA in PLOT()? By: chris_torrence@NOSPAM on Tue, 13 May 2014 10:52
		Re: Using VERT_COLORS=RGBA in PLOT()? By: dg86 on Tue, 13 May 2014 13:41

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