plscmap1l: Set color map1 colors using a
piece-wise linear relationship 

DESCRIPTION:

    Bounds on coordinatesRGBR[0, 1]magnitudeRGBG[0, 1]magnitudeRGBB[0,
    1]magnitudeHLShue[0, 360]degreesHLSlightness[0,
    1]magnitudeHLSsaturation[0, 1]magnitude

SYNOPSIS:

plscmap1l(itype, npts, pos, coord1, coord2, coord3, 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 

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