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

DESCRIPTION:

    This function is used in example 30. 

SYNOPSIS:

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

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). 
