PLPOLY3(3plplot)						    PLplot API							  PLPOLY3(3plplot)

NAME

       plpoly3 - Draw a polygon in 3 space

SYNOPSIS

       plpoly3(n, x, y, z, draw, ifcc)

DESCRIPTION

       Draws  a  polygon  in  3  space	defined  by  n	points in x, y, and z. Setup like plline3(3plplot), but differs from that function in that
       plpoly3(3plplot) attempts to determine if the polygon is viewable depending on the order of the points within the arrays and the  value	of
       ifcc.  If the back of polygon is facing the viewer, then it isn't drawn.  If this isn't what you want, then use plline3(3plplot) instead.

       The  points are assumed to be in a plane, and the directionality of the plane is determined from the first three points.  Additional points
       do not have to lie on the plane defined by the first three, but if they do not, then the determination of  visibility  obviously  can't	be
       100%  accurate...  So  if you're 3 space polygons are too far from planar, consider breaking them into smaller polygons.  3 points define a
       plane :-).

       Bugs:  If one of the first two segments is of zero length, or if they are co-linear, the calculation of visibility has a  50/50	chance	of
       being correct.  Avoid such situations :-).  See x18c.c for an example of this problem. (Search for 20.1).

       Redacted form: plpoly3(x, y, z, code)

       This function is used in example 18.

ARGUMENTS

       n (PLINT, input)
	      Number of points defining line.

       x (PLFLT *, input)
	      Pointer to array with x coordinates of points.

       y (PLFLT *, input)
	      Pointer to array with y coordinates of points.

       z (PLFLT *, input)
	      Pointer to array with z coordinates of points.

       draw (PLBOOL *, input)
	      Pointer to array which controls drawing the segments of the polygon.  If draw[i] is true, then the polygon segment from index [i] to
	      [i+1] is drawn, otherwise, not.

       ifcc (PLBOOL, input)
	      If ifcc is true the directionality of the polygon is determined by assuming the points are laid out in  a  counter-clockwise  order.
	      Otherwise, the directionality of the polygon is determined by assuming the points are laid out in a clockwise order.

AUTHORS

       Geoffrey  Furnish  and  Maurice LeBrun wrote and maintain PLplot.  This man page was automatically generated from the DocBook source of the
       PLplot documentation, maintained by Alan W. Irwin and Rafael Laboissiere.

SEE ALSO

       PLplot documentation at http://plplot.sourceforge.net/resources.

								   August, 2012 						  PLPOLY3(3plplot)