
plgradient: Draw linear gradient inside polygon 

DESCRIPTION:

    This function is used in examples 25,30. 

SYNOPSIS:

plgradient(n, x, y, angle)

ARGUMENTS:

    n (PLINT, input) :      Number of vertices in polygon. 

    x (const PLFLT *, input) :      Pointer to array with x coordinates of
    vertices. 

    y (const PLFLT *, input) :      Pointer to array with y coordinates of
    vertices. 

    angle (PLFLT, input) :    Angle (degrees) of gradient vector from x
    axis. 
