plgcol0a
( | icol0, |
r, | |
g, | |
b, | |
alpha) ; |
Returns 8-bit RGB values (0-255) and double alpha transparency value (0.0 - 1.0) for given color from cmap0 (see the section called “Color Map0”). Values are negative if an invalid color id is given.
icol0
(PLINT
, input)
Index of desired cmap0 color.
r
(PLINT *
, output)
Pointer to 8-bit red value.
g
(PLINT *
, output)
Pointer to 8-bit green value.
b
(PLINT *
, output)
Pointer to 8-bit blue value.
alpha
(PLFLT *
, output)
Pointer to PLFLT alpha transparency value.
This function is used in example 30.