plgcol0a.3plplot man page

plgcol0a — Returns 8-bit RGB values and PLFLT alpha transparency value for given color index from cmap0

Synopsis

plgcol0a(icol0, r, g, b, alpha)

Description

Returns 8-bit RGB values (0-255) and PLFLT alpha transparency value (0.0-1.0) for given color from cmap0 (see the PLplot documentation).  Values are negative if an invalid color id is given.

Redacted form: plgcola(r, g, b)

This function is used in example 30.

Arguments

icol0 (PLINT(3plplot), input)

Index of desired cmap0 color.

r (PLINT_NC_SCALAR(3plplot), output)

Returned value of the red intensity in the range from 0 to 255.

g (PLINT_NC_SCALAR(3plplot), output)

Returned value of the green intensity in the range from 0 to 255.

b (PLINT_NC_SCALAR(3plplot), output)

Returned value of the blue intensity in the range from 0 to 255.

alpha (PLFLT_NC_SCALAR(3plplot), output)

Returned value of the alpha transparency in the range from (0.0-1.0).

Authors

Many developers (who are credited at http://plplot.sourceforge.net/credits.php) have contributed to PLplot over its long history.

See Also

PLplot documentation at http://plplot.sourceforge.net/documentation.php.

Info

January, 2017 PLplot API