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plscol0a: Set 8-bit RGB values and double alpha transparency value for given cmap0 color index
DESCRIPTION:
This function is used in example 30.
SYNOPSIS:
plscol0a(icol0, r, g, b, alpha)
ARGUMENTS:
icol0 (PLINT, input) : Color index. Must be less than the maximum
number of colors (which is set by default, by plscmap0n, or even
by plscmap0).
r (PLINT, input) : Unsigned 8-bit integer (0-255) representing the
degree of red in the color.
g (PLINT, input) : Unsigned 8-bit integer (0-255) representing the
degree of green in the color.
b (PLINT, input) : Unsigned 8-bit integer (0-255) representing the
degree of blue in the color.
alpha (PLFLT, input) : double value (0.0-1.0) representing the
alpha transparency value of the color.
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