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// Cyphesis Online RPG Server and AI Engine
// Copyright (C) 2003 Alistair Riddoch
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
// $Id: Collision.h,v 1.14 2006-10-26 00:48:07 alriddoch Exp $
#ifndef PHYSICS_COLLISION_H
#define PHYSICS_COLLISION_H
#include "physics/Vector3D.h"
#include <wfmath/axisbox.h>
#include <map>
class Location;
typedef std::multimap<int, WFMath::Vector<3> > NormalSet;
////////////////////////// COLLISION //////////////////////////
/// \brief Predict collision between a point and a plane.
///
/// @return true if p is infront of plane before collision
bool getCollisionTime(const Point3D & p, // Position of point
const Vector3D & u, // Velocity of point
// float point_time, // Time since position set
const Point3D & l, // Position on plane
const Vector3D & n, // Plane normal
const Vector3D & v, // Velocity of plane
// float plane_time, // Time since position set
float & time); // Returned collision time
/// \brief Predict collision between two sets of meshes, defined by vertices
/// and surface normals.
///
/// @return true if a collision will occur, false otherwise.
bool predictCollision(const CoordList & l, // Vertices of this mesh
const NormalSet & ln, // Normals of this mesh
const Vector3D & u, // Velocity of this mesh
const CoordList & o, // Vertices of other mesh
const NormalSet & on, // Normals of other mesh
const Vector3D & v, // Velocity of other mesh
float & time, // Returned time to collision
Vector3D & normal); // Returned collision normal
/// \brief Predict collision between 2 entity locations.
///
/// @return true if a collision will occur.
bool predictCollision(const Location & l, // Location data of this object
const Location & o, // Location data of other object
float & time, // Returned time to collision
Vector3D & normal); // Returned collision normal
////////////////////////// EMERGENCE //////////////////////////
/// \brief Predict collision between a point and a plane.
///
/// @return true if p is behind plane before collision
bool getEmergenceTime(const Point3D & p, // Position of point
const Vector3D & u, // Velocity of point
// float point_time, // Time since position set
const Point3D & l, // Position on plane
const Vector3D & n, // Plane normal
const Vector3D & v, // Velocity of plane
// float plane_time, // Time since position set
float & time); // Returned collision time
/// \brief Predict emergence of one mesh from inside another, the two meshes
/// defined by vertices and surface normals.
///
/// @return true if the collision will occur within the timeframe,
/// false otherwise.
bool predictEmergence(const CoordList & l, // Vertices of this mesh
const Vector3D & u, // Velocity of this mesh
const WFMath::AxisBox<3>&,// Bounding box of container
float & time); // Returned time to collision
// FIXME Maybe another function like the above is required to handle if the
// container is more complex and has a set of meshes?
/// \brief Predict when entity emerges from inside other entity.
///
/// @return true if the collision will occur within the timeframe,
/// false otherwise.
bool predictEmergence(const Location & l, // Location data of this object
const Location & o, // Location data of container
float & time); // Returned time to collision
#endif // PHYSICS_COLLISION_H
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