// Filename: collisionSegment.I
// Created by:  drose (30Jan01)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University.  All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license.  You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////


////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::Default Constructor
//       Access: Public
//  Description: Creates an invalid segment.  This isn't terribly useful;
//               it's expected that the user will subsequently adjust
//               the segment via set_origin()/set_direction() or
//               set_from_lens().
////////////////////////////////////////////////////////////////////
INLINE CollisionSegment::
CollisionSegment() :
  _a(LPoint3f(0.0, 0.0, 0.0)),
  _b(LPoint3f(0.0, 0.0, 0.0))
{
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE CollisionSegment::
CollisionSegment(const LPoint3f &a, const LPoint3f &b) :
  _a(a), _b(b)
{
  nassertv(_a != _b);
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE CollisionSegment::
CollisionSegment(float ax, float ay, float az,
                 float bx, float by, float bz) :
  _a(ax, ay, az), _b(bx, by, bz)
{
  nassertv(_a != _b);
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::Copy Constructor
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE CollisionSegment::
CollisionSegment(const CollisionSegment &copy) :
  CollisionSolid(copy),
  _a(copy._a),
  _b(copy._b)
{
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::set_point_a
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE void CollisionSegment::
set_point_a(const LPoint3f &a) {
  _a = a;
  mark_internal_bounds_stale();
  mark_viz_stale();
  // We don't assert here that a != b, on the assumption that you
  // might be about to change both at once, and you'll probably start
  // by changing a first.
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::set_point_a
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE void CollisionSegment::
set_point_a(float x, float y, float z) {
  set_point_a(LPoint3f(x, y, z));
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::get_point_a
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE const LPoint3f &CollisionSegment::
get_point_a() const {
  return _a;
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::set_point_b
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE void CollisionSegment::
set_point_b(const LPoint3f &b) {
  _b = b;
  mark_internal_bounds_stale();
  mark_viz_stale();
  nassertv(_a != _b);
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::set_point_b
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE void CollisionSegment::
set_point_b(float x, float y, float z) {
  set_point_b(LPoint3f(x, y, z));
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::get_point_b
//       Access: Public
//  Description:
////////////////////////////////////////////////////////////////////
INLINE const LPoint3f &CollisionSegment::
get_point_b() const {
  return _b;
}

////////////////////////////////////////////////////////////////////
//     Function: CollisionSegment::set_from_lens
//       Access: Public
//  Description: Accepts a LensNode and a 2-d point in the range
//               [-1,1].  Sets the CollisionSegment so that it begins at
//               the LensNode's near plane and extends to the
//               far plane, making it suitable for picking objects
//               from the screen given a camera and a mouse location.
////////////////////////////////////////////////////////////////////
INLINE bool CollisionSegment::
set_from_lens(LensNode *camera, float px, float py) {
  return set_from_lens(camera, LPoint2f(px, py));
}