[] Joins the point (x1, y1) to (x2, y2).
[] 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.
¸pllab, plline, pljoin, API
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