axmol/cocos/physics/CCPhysicsJoint.cpp

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
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#include "CCPhysicsJoint.h"
#ifdef CC_USE_PHYSICS

#if (CC_PHYSICS_ENGINE == CC_PHYSICS_CHIPMUNK)
#include "chipmunk.h"
#elif (CC_PHYSICS_ENGINE == CCPHYSICS_BOX2D)
#include "Box2D.h"
#endif

#include "CCPhysicsBody.h"
#include "CCPhysicsWorld.h"

#include "chipmunk/CCPhysicsJointInfo_chipmunk.h"
#include "box2d/CCPhysicsJointInfo_box2d.h"
#include "chipmunk/CCPhysicsBodyInfo_chipmunk.h"
#include "box2d/CCPhysicsBodyInfo_box2d.h"
#include "chipmunk/CCPhysicsShapeInfo_chipmunk.h"
#include "box2d/CCPhysicsShapeInfo_box2d.h"
#include "chipmunk/CCPhysicsHelper_chipmunk.h"
#include "box2d/CCPhysicsHelper_box2d.h"
#include "CCNode.h"

NS_CC_BEGIN

PhysicsJoint::PhysicsJoint()
: _bodyA(nullptr)
, _bodyB(nullptr)
, _world(nullptr)
, _info(nullptr)
, _enable(false)
, _collisionEnable(true)
, _destoryMark(false)
, _tag(0)
{
    
}

PhysicsJoint::~PhysicsJoint()
{
    // reset the shapes collision group
    setCollisionEnable(true);
    
    CC_SAFE_DELETE(_info);
}

bool PhysicsJoint::init(cocos2d::PhysicsBody *a, cocos2d::PhysicsBody *b)
{
    do
    {
        CC_BREAK_IF(!(_info = new PhysicsJointInfo(this)));
        
        if (a != nullptr)
        {
            _bodyA = a;
            _bodyA->_joints.push_back(this);
        }
        
        if (b != nullptr)
        {
            _bodyB = b;
            _bodyB->_joints.push_back(this);
        }
        
        return true;
    } while (false);
    
    return false;
}

void PhysicsJoint::setEnable(bool enable)
{
    if (_enable != enable)
    {
        _enable = enable;
        
        if (_world != nullptr)
        {
            if (enable)
            {
                _world->addJointOrDelay(this);
            }else
            {
                _world->removeJointOrDelay(this);
            }
        }
    }
}

PhysicsJointPin::PhysicsJointPin()
{
    
}

PhysicsJointPin::~PhysicsJointPin()
{
    
}

PhysicsJointFixed::PhysicsJointFixed()
{
    
}

PhysicsJointFixed::~PhysicsJointFixed()
{
    
}

PhysicsJointSliding::PhysicsJointSliding()
{
    
}

PhysicsJointSliding::~PhysicsJointSliding()
{
    
}

PhysicsJointLimit::PhysicsJointLimit()
{
    
}

PhysicsJointLimit::~PhysicsJointLimit()
{
    
}

PhysicsJointDistance::PhysicsJointDistance()
{
    
}

PhysicsJointDistance::~PhysicsJointDistance()
{
    
}

#if (CC_PHYSICS_ENGINE == CC_PHYSICS_CHIPMUNK)
PhysicsBodyInfo* PhysicsJoint::getBodyInfo(PhysicsBody* body) const
{
    return body->_info;
}

Node* PhysicsJoint::getBodyNode(PhysicsBody* body) const
{
    return body->_node;
}


void PhysicsJoint::setCollisionEnable(bool enable)
{
    if (_collisionEnable != enable)
    {
        _collisionEnable = enable;
    }
}

void PhysicsJoint::removeFormWorld()
{
    if (_world)
    {
        _world->removeJoint(this, false);
    }
}

void PhysicsJoint::destroy(PhysicsJoint* joint)
{
    if (joint!= nullptr)
    {
        // remove the joint and delete it.
        if (joint->_world != nullptr)
        {
            joint->_world->removeJoint(joint, true);
        }
        else
        {
            if (joint->_bodyA != nullptr)
            {
                joint->_bodyA->removeJoint(joint);
            }
            
            if (joint->_bodyB != nullptr)
            {
                joint->_bodyB->removeJoint(joint);
            }
            
            delete joint;
        }
    }
}

PhysicsJointFixed* PhysicsJointFixed::construct(PhysicsBody* a, PhysicsBody* b, const Point& anchr)
{
    PhysicsJointFixed* joint = new PhysicsJointFixed();
    
    if (joint && joint->init(a, b, anchr))
    {
        return joint;
    }
    
    CC_SAFE_DELETE(joint);
    return nullptr;
}

bool PhysicsJointFixed::init(PhysicsBody* a, PhysicsBody* b, const Point& anchr)
{
    do
    {
        CC_BREAK_IF(!PhysicsJoint::init(a, b));
        
        getBodyNode(a)->setPosition(anchr);
        getBodyNode(b)->setPosition(anchr);
        
        // add a pivot joint to fixed two body together
        cpConstraint* joint = cpPivotJointNew(getBodyInfo(a)->getBody(), getBodyInfo(b)->getBody(),
                                        PhysicsHelper::point2cpv(anchr));
        CC_BREAK_IF(joint == nullptr);
        _info->add(joint);
        
        // add a gear joint to make two body have the same rotation.
        joint = cpGearJointNew(getBodyInfo(a)->getBody(), getBodyInfo(b)->getBody(), 0, 1);
        CC_BREAK_IF(joint == nullptr);
        _info->add(joint);
        
        setCollisionEnable(false);
        
        return true;
    } while (false);
    
    return false;
}

PhysicsJointPin* PhysicsJointPin::construct(PhysicsBody* a, PhysicsBody* b, const Point& anchr)
{
    PhysicsJointPin* joint = new PhysicsJointPin();
    
    if (joint && joint->init(a, b, anchr))
    {
        return joint;
    }
    
    CC_SAFE_DELETE(joint);
    return nullptr;
}

bool PhysicsJointPin::init(PhysicsBody *a, PhysicsBody *b, const Point& anchr)
{
    do
    {
        CC_BREAK_IF(!PhysicsJoint::init(a, b));
        cpConstraint* joint = cpPivotJointNew(getBodyInfo(a)->getBody(), getBodyInfo(b)->getBody(),
                                       PhysicsHelper::point2cpv(anchr));
        
        CC_BREAK_IF(joint == nullptr);
        
        _info->add(joint);
        
        return true;
    } while (false);
    
    return false;
}

void PhysicsJointPin::setMaxForce(float force)
{
    _info->getJoints().front()->maxForce = PhysicsHelper::float2cpfloat(force);
}

float PhysicsJointPin::getMaxForce() const
{
    return PhysicsHelper::cpfloat2float(_info->getJoints().front()->maxForce);
}

PhysicsJointSliding* PhysicsJointSliding::construct(PhysicsBody* a, PhysicsBody* b, const Point& grooveA, const Point& grooveB, const Point& anchr)
{
    PhysicsJointSliding* joint = new PhysicsJointSliding();
    
    if (joint && joint->init(a, b, grooveA, grooveB, anchr))
    {
        return joint;
    }
    
    CC_SAFE_DELETE(joint);
    return nullptr;
}

bool PhysicsJointSliding::init(PhysicsBody* a, PhysicsBody* b, const Point& grooveA, const Point& grooveB, const Point& anchr)
{
    do
    {
        CC_BREAK_IF(!PhysicsJoint::init(a, b));
        
        cpConstraint* joint = cpGrooveJointNew(getBodyInfo(a)->getBody(), getBodyInfo(b)->getBody(),
                                       PhysicsHelper::point2cpv(grooveA),
                                       PhysicsHelper::point2cpv(grooveB),
                                       PhysicsHelper::point2cpv(anchr));
        
        CC_BREAK_IF(joint == nullptr);
        
        _info->add(joint);
        
        return true;
    } while (false);
    
    return false;
}


PhysicsJointLimit* PhysicsJointLimit::construct(PhysicsBody* a, PhysicsBody* b, const Point& anchr1, const Point& anchr2)
{
    PhysicsJointLimit* joint = new PhysicsJointLimit();
    
    if (joint && joint->init(a, b, anchr1, anchr2))
    {
        return joint;
    }
    
    CC_SAFE_DELETE(joint);
    return nullptr;
}

bool PhysicsJointLimit::init(PhysicsBody* a, PhysicsBody* b, const Point& anchr1, const Point& anchr2)
{
    do
    {
        CC_BREAK_IF(!PhysicsJoint::init(a, b));
        
        cpConstraint* joint = cpSlideJointNew(getBodyInfo(a)->getBody(), getBodyInfo(b)->getBody(),
                                       PhysicsHelper::point2cpv(anchr1),
                                       PhysicsHelper::point2cpv(anchr2),
                                       0,
                                       PhysicsHelper::float2cpfloat(anchr1.getDistance(anchr2)));
        
        CC_BREAK_IF(joint == nullptr);
        
        _info->add(joint);
        
        return true;
    } while (false);
    
    return false;
}

float PhysicsJointLimit::getMin() const
{
    return PhysicsHelper::cpfloat2float(cpSlideJointGetMin(_info->getJoints().front()));
}

void PhysicsJointLimit::setMin(float min)
{
    cpSlideJointSetMin(_info->getJoints().front(), PhysicsHelper::float2cpfloat(min));
}

float PhysicsJointLimit::getMax() const
{
    return PhysicsHelper::cpfloat2float(cpSlideJointGetMax(_info->getJoints().front()));
}

void PhysicsJointLimit::setMax(float max)
{
    cpSlideJointSetMax(_info->getJoints().front(), PhysicsHelper::float2cpfloat(max));
}

PhysicsJointDistance* PhysicsJointDistance::construct(PhysicsBody* a, PhysicsBody* b, const Point& anchr1, const Point& anchr2)
{
    PhysicsJointDistance* joint = new PhysicsJointDistance();
    
    if (joint && joint->init(a, b, anchr1, anchr2))
    {
        return joint;
    }
    
    CC_SAFE_DELETE(joint);
    return nullptr;
}

bool PhysicsJointDistance::init(PhysicsBody* a, PhysicsBody* b, const Point& anchr1, const Point& anchr2)
{
    do
    {
        CC_BREAK_IF(!PhysicsJoint::init(a, b));
        
        cpConstraint* joint = cpPinJointNew(getBodyInfo(a)->getBody(),
                                            getBodyInfo(b)->getBody(),
                                            PhysicsHelper::point2cpv(anchr1), PhysicsHelper::point2cpv(anchr2));
        
        CC_BREAK_IF(joint == nullptr);
        
        _info->add(joint);
        
        return true;
    } while (false);
    
    return false;
}

#elif (CC_PHYSICS_ENGINE == CC_PHYSICS_BOX2D)

#endif

NS_CC_END
#endif // CC_USE_PHYSICS