NAME

       plscmap1la   -  Set  cmap1  colors  and  alpha  transparency  using  a  piece-wise  linear
       relationship

SYNOPSIS

       plscmap1la(itype, npts, intensity, coord1, coord2, coord3, alpha, alt_hue_path)

DESCRIPTION

       This is a variant of plscmap1l(3plplot) that supports alpha channel transparency. It  sets
       cmap1  colors  using  a  piece-wise  linear  relationship  between  cmap1  intensity index
       (0.0-1.0) and position in HLS or RGB color space (see the PLplot documentation) with alpha
       transparency value (0.0-1.0). It may be called at any time.

       Redacted form: plscmap1la(itype, intensity, coord1, coord2, coord3, alpha, alt_hue_path)

       This function is used in example 30.

ARGUMENTS

       itype (PLBOOL(3plplot), input)
              true: RGB, false: HLS.

       npts (PLINT(3plplot), input)
              number of control points.

       intensity (PLFLT_VECTOR(3plplot), input)
              A vector containing the cmap1 intensity index (0.0-1.0) in ascending order for each
              control point.

       coord1 (PLFLT_VECTOR(3plplot), input)
              A vector containing the first coordinate (H or R) for each control point.

       coord2 (PLFLT_VECTOR(3plplot), input)
              A vector containing the second coordinate (L or G) for each control point.

       coord3 (PLFLT_VECTOR(3plplot), input)
              A vector containing the third coordinate (S or B) for each control point.

       alpha (PLFLT_VECTOR(3plplot), input)
              A vector containing the alpha transparency value (0.0-1.0) for each control point.

       alt_hue_path (PLBOOL_VECTOR(3plplot), input)
              A vector (with npts - 1 elements) containing the alternative  interpolation  method
              Boolean  value  for  each  control  point interval.  (alt_hue_path[i] refers to the
              interpolation interval between the i and i + 1 control points).

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.

                                          November, 2017                      PLSCMAP1LA(3plplot)