trusty (3) plscmap1la.3plplot.gz

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 (from 0. to 1.) 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, input)
              true: RGB, false: HLS.

       npts (PLINT, input)
              number of control points

       intensity (const PLFLT *, input)
              position for each control point (between 0.0 and 1.0, in ascending order)

       coord1 (const PLFLT *, input)
              first coordinate (H or R) for each control point

       coord2 (const PLFLT *, input)
              second coordinate (L or G) for each control point

       coord3 (const PLFLT *, input)
              third coordinate (S or B) for each control point

       alpha (const PLFLT *, input)
              the alpha transparency value for each control point

       alt_hue_path (const PLBOOL *, input)
              alternative interpolation method flag for each control  point.   (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.

                                                 February, 2014                              PLSCMAP1LA(3plplot)