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plpoly3(3plplot) [debian man page]

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)

Check Out this Related Man Page

PLPOIN3(3plplot)						    PLplot API							  PLPOIN3(3plplot)

NAME

       plpoin3 - Plot a glyph at the specified 3D points

SYNOPSIS

       plpoin3(n, x, y, z, code)

DESCRIPTION

       Plot  a	glyph  at  the specified 3D points.  (This function is largely superseded by plstring3(3plplot) which gives access to many[!] more
       glyphs.) Set up the call to this function similar to what is done for plline3(3plplot). code=-1 means try to just draw a point.	Right  now
       it's  just  a  move and a draw at the same place.  Not ideal, since a sufficiently intelligent output device may optimize it away, or there
       may be faster ways of doing it.	This is OK for now, though, and offers a 4X speedup over drawing a Hershey font "point" (which is actually
       diamond	shaped	and therefore takes 4 strokes to draw).  If 0 < code < 32, then a useful (but small subset) of Hershey symbols is plotted.
       If 32 <= code <= 127 the corresponding printable ASCII character is plotted.

       Redacted form: plpoin3(x, y, z, code)

       This function is not used in any example.

ARGUMENTS

       n (PLINT, input)
	      Number of points in the x and y arrays.

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

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

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

       code (PLINT, input)
	      Hershey symbol code (in "ascii-indexed" form with -1 <= code <= 127) corresponding to a glyph to be plotted at each of the n points.

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 						  PLPOIN3(3plplot)
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