
plpath: Draw a line between two points, accounting for coordinate transforms 

DESCRIPTION:

    This function is used in example 22. 

SYNOPSIS:

plpath(n, x1, y1, x2, y2)

ARGUMENTS:

    n (PLINT, input) :      number of points to use to approximate the path. 

    x1 (PLFLT, input) :    x coordinate of first point. 

    y1 (PLFLT, input) :    y coordinate of first point. 

    x2 (PLFLT, input) :    x coordinate of second point. 

    y2 (PLFLT, input) :    y coordinate of second point. 
