mirror of
https://github.com/love2d/love.git
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Bart van Strien
138 lines
3.0 KiB
C++
138 lines
3.0 KiB
C++
/**
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* Copyright (c) 2006-2012 LOVE Development Team
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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**/
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#ifndef LOVE_PHYSICS_BOX2D_JOINT_H
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#define LOVE_PHYSICS_BOX2D_JOINT_H
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// LOVE
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#include "common/runtime.h"
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#include "physics/Joint.h"
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// Box2D
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#include <Box2D/Box2D.h>
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namespace love
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{
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namespace physics
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{
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namespace box2d
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{
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// Forward declarations.
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class Body;
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class World;
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/**
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* A Joint acts as positioning constraints on Bodies.
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* A Joint can be used to prevent Bodies from going to
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* far apart, or coming too close together.
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**/
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class Joint : public love::physics::Joint
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{
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public:
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friend class GearJoint;
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/**
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* This constructor will connect one end of the joint to body1,
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* and the other one to the default ground body.
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*
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* This constructor is mainly used by MouseJoint.
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**/
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Joint(Body *body1);
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/**
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* Create a joint between body1 and body2.
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**/
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Joint(Body *body1, Body *body2);
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virtual ~Joint();
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/**
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* Returns true if the joint is active in a Box2D world.
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**/
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bool isValid() const;
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/**
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* Gets the type of joint.
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**/
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Type getType() const;
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/**
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* Gets the anchor positions of the Joint in world
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* coordinates. This is useful for debugdrawing the joint.
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**/
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int getAnchors(lua_State *L);
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/**
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* Gets the reaction force on body2 at the joint anchor.
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**/
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int getReactionForce(lua_State *L);
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/**
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* Gets the reaction torque on body2.
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**/
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float getReactionTorque(float dt);
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bool isActive() const;
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bool getCollideConnected() const;
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/**
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* Joints require pointers to a Box2D joint objects at
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* different polymorphic levels, which is why these function
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* were created.
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**/
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/**
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* Destroys the joint. This function was created just to
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* get some cinsistency.
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**/
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void destroyJoint(bool implicit = false);
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protected:
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/**
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* Creates a Joint, and ensures that the parent class
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* gets a copy of the pointer.
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**/
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b2Joint *createJoint(b2JointDef *def);
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World *world;
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private:
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// A Joint must be destroyed *before* the bodies it acts upon,
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// and the world they reside in. We therefore need refs
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// parents and associations to prevent wrong destruction order.
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Body *body1, * body2;
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// The Box2D joint object.
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b2Joint *joint;
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};
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} // box2d
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} // physics
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} // love
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#endif // LOVE_PHYSICS_BOX2D_JOINT_H
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