// Filename: eggPolygon.I
// Created by:  drose (10Feb99)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt .
//
// To contact the maintainers of this program write to
// panda3d@yahoogroups.com .
//
////////////////////////////////////////////////////////////////////



////////////////////////////////////////////////////////////////////
//     Function: EggPolygon::Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE EggPolygon::
EggPolygon(const string &name) : EggPrimitive(name) {
}

////////////////////////////////////////////////////////////////////
//     Function: EggPolygon::Copy constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE EggPolygon::
EggPolygon(const EggPolygon &copy) : EggPrimitive(copy) {
}

////////////////////////////////////////////////////////////////////
//     Function: EggPolygon::Copy assignment operator
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE EggPolygon &EggPolygon::
operator = (const EggPolygon &copy) {
  EggPrimitive::operator = (copy);
  return *this;
}

////////////////////////////////////////////////////////////////////
//     Function: EggPolygon::recompute_polygon_normal
//       Access: Public
//  Description: Recalculates the normal according to the order of the
//               vertices, and sets it.  Returns true if the normal is
//               computed correctly, or false if the polygon is
//               degenerate and does not have a normal.
////////////////////////////////////////////////////////////////////
INLINE bool EggPolygon::
recompute_polygon_normal(CoordinateSystem cs) {
  Normald normal;
  if (calculate_normal(normal, cs)) {
    set_normal(normal);
    return true;
  }
  clear_normal();
  return false;
}

////////////////////////////////////////////////////////////////////
//     Function: EggPolygon::triangulate_into
//       Access: Public
//  Description: Subdivides the polygon into triangles and adds each
//               one to the indicated container.  If the polygon is
//               already a triangle, adds an exact copy of the polygon
//               to the container.  Does not remove the polygon from
//               its existing parent or modify it in any way.
//
//               Returns true if the triangulation is successful, or
//               false if there was some error (in which case the
//               container may contain some partial triangulation).
//
//               If convex_also is true, both concave and convex
//               polygons will be subdivided into triangles;
//               otherwise, only concave polygons will be subdivided,
//               and convex polygons will be copied unchanged into the
//               container.
////////////////////////////////////////////////////////////////////
INLINE bool EggPolygon::
triangulate_into(EggGroupNode *container, bool convex_also) const {
  PT(EggPolygon) copy = new EggPolygon(*this);
  return copy->triangulate_poly(container, convex_also);
}
