mirror of
https://github.com/love2d/love.git
synced 2026-08-15 15:51:12 +02:00
Bill Meltsner
132 lines
3.1 KiB
C++
132 lines
3.1 KiB
C++
/**
|
|
* Copyright (c) 2006-2011 LOVE Development Team
|
|
*
|
|
* This software is provided 'as-is', without any express or implied
|
|
* warranty. In no event will the authors be held liable for any damages
|
|
* arising from the use of this software.
|
|
*
|
|
* Permission is granted to anyone to use this software for any purpose,
|
|
* including commercial applications, and to alter it and redistribute it
|
|
* freely, subject to the following restrictions:
|
|
*
|
|
* 1. The origin of this software must not be misrepresented; you must not
|
|
* claim that you wrote the original software. If you use this software
|
|
* in a product, an acknowledgment in the product documentation would be
|
|
* appreciated but is not required.
|
|
* 2. Altered source versions must be plainly marked as such, and must not be
|
|
* misrepresented as being the original software.
|
|
* 3. This notice may not be removed or altered from any source distribution.
|
|
**/
|
|
|
|
#ifndef LOVE_PHYSICS_BOX2D_JOINT_H
|
|
#define LOVE_PHYSICS_BOX2D_JOINT_H
|
|
|
|
// LOVE
|
|
#include <common/runtime.h>
|
|
#include <physics/Joint.h>
|
|
|
|
// Box2D
|
|
#include <Box2D/Box2D.h>
|
|
|
|
namespace love
|
|
{
|
|
namespace physics
|
|
{
|
|
namespace box2d
|
|
{
|
|
// Forward declarations.
|
|
class Body;
|
|
class World;
|
|
|
|
/**
|
|
* A Joint acts as positioning constraints on Bodies.
|
|
* A Joint can be used to prevent Bodies from going to
|
|
* far apart, or coming too close together.
|
|
**/
|
|
class Joint : public love::physics::Joint
|
|
{
|
|
friend class GearJoint;
|
|
|
|
private:
|
|
|
|
// A Joint must be destroyed *before* the bodies it acts upon,
|
|
// and the world they reside in. We therefore need refs
|
|
// parents and associations to prevent wrong destruction order.
|
|
Body * body1, * body2;
|
|
|
|
|
|
// The Box2D joint object.
|
|
b2Joint * joint;
|
|
|
|
protected:
|
|
World * world;
|
|
|
|
public:
|
|
|
|
/**
|
|
* This constructor will connect one end of the joint to body1,
|
|
* and the other one to the default ground body.
|
|
*
|
|
* This constructor is mainly used by MouseJoint.
|
|
**/
|
|
Joint(Body * body1);
|
|
|
|
/**
|
|
* Create a joint between body1 and body2.
|
|
**/
|
|
Joint(Body * body1, Body * body2);
|
|
|
|
virtual ~Joint();
|
|
|
|
/**
|
|
* Gets the type of joint.
|
|
**/
|
|
Type getType() const;
|
|
|
|
/**
|
|
* Gets the anchor positions of the Joint in world
|
|
* coordinates. This is useful for debugdrawing the joint.
|
|
**/
|
|
int getAnchors(lua_State * L);
|
|
|
|
/**
|
|
* Gets the reaction force on body2 at the joint anchor.
|
|
**/
|
|
int getReactionForce(lua_State * L);
|
|
|
|
/**
|
|
* Gets the reaction torque on body2.
|
|
**/
|
|
float getReactionTorque(float dt);
|
|
|
|
bool isActive() const;
|
|
|
|
bool getCollideConnected() const;
|
|
|
|
protected:
|
|
|
|
/**
|
|
* Joints require pointers to a Box2D joint objects at
|
|
* different polymorphic levels, which is why these function
|
|
* were created.
|
|
**/
|
|
|
|
/**
|
|
* Creates a Joint, and ensures that the parent class
|
|
* gets a copy of the pointer.
|
|
**/
|
|
b2Joint * createJoint(b2JointDef * def);
|
|
|
|
/**
|
|
* Destroys the joint. This function was created just to
|
|
* get some cinsistency.
|
|
**/
|
|
void destroyJoint(b2Joint * joint);
|
|
};
|
|
|
|
} // box2d
|
|
} // physics
|
|
} // love
|
|
|
|
#endif // LOVE_PHYSICS_BOX2D_JOINT_H
|