
plscmap1la: Set color map1 colors using a piece-wise linear relationship 

DESCRIPTION:

    This function is used in example 30. 

SYNOPSIS:

plscmap1l(itype, npts, pos, coord1, coord2, coord3, coord4, rev)

ARGUMENTS:

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

    npts (PLINT, input) :    number of control points 

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

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

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

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

    coord4 (PLFLT *, input) :     fourth coordinate, the alpha value for
    each control point 

    rev (PLBOOL: *, input) :    reverse flag for each control point.
    (rev[i] refers to the interpolation interval between the i and i +
    1 control points). 
