NAME

       plscmap1a - Set semitransparent cmap1 RGBA colors.

SYNOPSIS

       plscmap1a(r, g, b, alpha, ncol1)

DESCRIPTION

       Set  semitransparent cmap1 colors (see the PLplot documentation) using RGBA vector values.
       This function also sets the number of cmap1 colors.   N.B.  Continuous  cmap1  colors  are
       indexed  with  a  floating-point  index  in  the  range  from  0.0-1.0  which  is linearly
       transformed (e.g., by plcol1(3plplot)) to an integer index of these RGBA  vectors  in  the
       range from 0 to ncol1-1.  So in order for this continuous color model to work properly, it
       is the responsibility of the user of plscmap1(3plplot) to insure that these  RGBA  vectors
       are continuous functions of their integer indices.

       Redacted form: plscmap1a(r, g, b, alpha)

       This function is used in example 31.

ARGUMENTS

       r (PLINT_VECTOR(3plplot), input)
              A  vector  that  represents (using unsigned 8-bit integers in the range from 0-255)
              the degree of red in the color as a continuous function of the integer index of the
              vector.

       g (PLINT_VECTOR(3plplot), input)
              A  vector  that  represents (using unsigned 8-bit integers in the range from 0-255)
              the degree of green in the color as a continuous function of the integer  index  of
              the vector.

       b (PLINT_VECTOR(3plplot), input)
              A  vector  that  represents (using unsigned 8-bit integers in the range from 0-255)
              the degree of blue in the color as a continuous function of the  integer  index  of
              the vector.

       alpha (PLFLT_VECTOR(3plplot), input)
              A  vector  that  represents (using PLFLT values in the range from 0.0-1.0 where 0.0
              corresponds to completely transparent and 1.0 corresponds to completely opaque) the
              alpha  transparency  of  the color as a continuous function of the integer index of
              the vector.

       ncol1 (PLINT(3plplot), input)
              Number of items in the r, g, b, and alpha vectors.

AUTHORS

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

SEE ALSO

       PLplot documentation at http://plplot.org/documentation.php.

                                          February, 2023                       PLSCMAP1A(3plplot)