plscmap1a - Set semitransparent cmap1 RGBA colors.

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.

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

       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.

plscmap1a - Set semitransparent cmap1 RGBA colors.

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

                                                   July, 2025                                 PLSCMAP1A(3plplot)

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