axmol/cocos2dx/physics/CCPhysicsWorld.cpp

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
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#include "CCPhysicsWorld.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 "CCPhysicsShape.h"
#include "CCPhysicsContact.h"
#include "CCPhysicsJoint.h"

#include "chipmunk/CCPhysicsWorldInfo.h"
#include "Box2D/CCPhysicsWorldInfo.h"
#include "chipmunk/CCPhysicsBodyInfo.h"
#include "Box2D/CCPhysicsBodyInfo.h"
#include "chipmunk/CCPhysicsShapeInfo.h"
#include "Box2D/CCPhysicsShapeInfo.h"
#include "chipmunk/CCPhysicsContactInfo.h"
#include "Box2D/CCPhysicsContactInfo.h"
#include "chipmunk/CCPhysicsJointInfo.h"
#include "Box2D/CCPhysicsJointInfo.h"
#include "chipmunk/CCPhysicsHelper.h"

#include "draw_nodes/CCDrawNode.h"
#include "cocoa/CCArray.h"
#include "layers_scenes_transitions_nodes/CCScene.h"
#include "CCDirector.h"

#include <algorithm>

NS_CC_BEGIN

#if (CC_PHYSICS_ENGINE == CC_PHYSICS_CHIPMUNK)

const float PHYSICS_INFINITY = INFINITY;

int PhysicsWorld::collisionBeginCallbackFunc(cpArbiter *arb, struct cpSpace *space, void *data)
{
    PhysicsWorld* world = static_cast<PhysicsWorld*>(data);
    
    CP_ARBITER_GET_SHAPES(arb, a, b);
    
    auto ita = PhysicsShapeInfo::map.find(a);
    auto itb = PhysicsShapeInfo::map.find(b);
    CC_ASSERT(ita != PhysicsShapeInfo::map.end() && itb != PhysicsShapeInfo::map.end());
    
    PhysicsContact* contact = PhysicsContact::create(ita->second->shape, itb->second->shape);
    arb->data = contact;
    
    return world->collisionBeginCallback(*static_cast<PhysicsContact*>(arb->data));
}

int PhysicsWorld::collisionPreSolveCallbackFunc(cpArbiter *arb, cpSpace *space, void *data)
{
    PhysicsWorld* world = static_cast<PhysicsWorld*>(data);
    return world->collisionPreSolveCallback(*static_cast<PhysicsContact*>(arb->data),
                                            PhysicsContactPreSolve());
}

void PhysicsWorld::collisionPostSolveCallbackFunc(cpArbiter *arb, cpSpace *space, void *data)
{
    PhysicsWorld* world = static_cast<PhysicsWorld*>(data);
    world->collisionPostSolveCallback(*static_cast<PhysicsContact*>(arb->data),
                                      PhysicsContactPostSolve());
}

void PhysicsWorld::collisionSeparateCallbackFunc(cpArbiter *arb, cpSpace *space, void *data)
{
    PhysicsWorld* world = static_cast<PhysicsWorld*>(data);
    PhysicsContact* contact = static_cast<PhysicsContact*>(arb->data);
    
    world->collisionSeparateCallback(*contact);
    
    delete contact;
}

bool PhysicsWorld::init()
{
    _info = new PhysicsWorldInfo();
    
    cpSpaceSetGravity(_info->space, PhysicsHelper::point2cpv(_gravity));
    
    cpSpaceSetDefaultCollisionHandler(_info->space,
                                      PhysicsWorld::collisionBeginCallbackFunc,
                                      PhysicsWorld::collisionPreSolveCallbackFunc,
                                      PhysicsWorld::collisionPostSolveCallbackFunc,
                                      PhysicsWorld::collisionSeparateCallbackFunc,
                                      this);
    
    return true;
}

void PhysicsWorld::addJoint(PhysicsJoint* joint)
{
    auto it = std::find(_joints.begin(), _joints.end(), joint);
    
    if (it == _joints.end())
    {
        _joints.push_back(joint);
        
        if (!cpSpaceContainsConstraint(_info->space, joint->_info->joint))
        {
            cpSpaceAddConstraint(_info->space, joint->_info->joint);
        }
    }
    
}

void PhysicsWorld::removeJoint(PhysicsJoint* joint)
{
    
}

void PhysicsWorld::removeAllJoints()
{
    
}

void PhysicsWorld::addShape(PhysicsShape* shape)
{
    for (auto cps : shape->_info->shapes)
    {
        if (cpSpaceContainsShape(_info->space, cps))
        {
            continue;
        }
        
        if (cpBodyIsStatic(shape->getBody()->_info->body))
        {
            cpSpaceAddStaticShape(_info->space, cps);
        }else
        {
            cpSpaceAddShape(_info->space, cps);
        }
    }
}

void PhysicsWorld::addBody(PhysicsBody* body)
{
    CCASSERT(body != nullptr, "the body can not be nullptr");
    
    if (body->isEnable())
    {
        //is gravity enable
        if (!body->isGravityEnable())
        {
            body->applyForce(-_gravity);
        }
        
        // add body to space
        if (body->isDynamic())
        {
            cpSpaceAddBody(_info->space, body->_info->body);
        }
        
        // add shapes to space
        for (auto shape : body->getShapes())
        {
            addShape(shape);
        }
    }
    
    if (_bodys == nullptr)
    {
        _bodys = Array::create(body, NULL);
        _bodys->retain();
    }else
    {
        _bodys->addObject(body);
    }
}

void PhysicsWorld::removeBody(PhysicsBody* body)
{
    CCASSERT(body != nullptr, "the body can not be nullptr");
    
    if (body->getWorld() == this)
    {
        // reset the gravity
        if (!body->isGravityEnable())
        {
            body->applyForce(-_gravity);
        }
    }
    
    // remove shaps
    for (auto shape : body->getShapes())
    {
        for (auto cps : shape->_info->shapes)
        {
            if (cpSpaceContainsShape(_info->space, cps))
            {
                cpSpaceRemoveShape(_info->space, cps);
            }
        }
    }
    
    // remove body
    if (cpSpaceContainsBody(_info->space, body->_info->body))
    {
        cpSpaceRemoveBody(_info->space, body->_info->body);
    }
    
    if (_bodys != nullptr)
    {
        _bodys->removeObject(body);
    }
}

void PhysicsWorld::removeBodyByTag(int tag)
{
    for (Object* obj : *_bodys)
    {
        PhysicsBody* body = dynamic_cast<PhysicsBody*>(obj);
        if (body->getTag() == tag)
        {
            removeBody(body);
            return;
        }
    }
}

void PhysicsWorld::removeShape(PhysicsShape* shape)
{
    for (auto cps : shape->_info->shapes)
    {
        if (cpSpaceContainsShape(_info->space, cps))
        {
            cpSpaceRemoveShape(_info->space, cps);
        }
    }
}

void PhysicsWorld::update(float delta)
{
    for (auto body : *_bodys)
    {
        body->update(delta);
    }
    
    cpSpaceStep(_info->space, delta);
    
    if (_drawNode)
    {
        _drawNode->removeFromParent();
        _drawNode = nullptr;
    }
    
    if (_debugDraw)
    {
        debugDraw();
    }
}

void PhysicsWorld::debugDraw()
{
    if (_debugDraw && _bodys != nullptr)
    {
        _drawNode= DrawNode::create();

        for (Object* obj : *_bodys)
        {
            PhysicsBody* body = dynamic_cast<PhysicsBody*>(obj);
            
            std::vector<PhysicsShape*> shapes = body->getShapes();
            
            for (auto shape : shapes)
            {
                drawWithShape(_drawNode, shape);
            }
        }
        
        if (_scene)
        {
            _scene->addChild(_drawNode);
        }
    }
}

void PhysicsWorld::setScene(Scene *scene)
{
    _scene = scene;
}

void PhysicsWorld::drawWithShape(DrawNode* node, PhysicsShape* shape)
{
    for (auto it = shape->_info->shapes.begin(); it != shape->_info->shapes.end(); ++it)
    {
        cpShape *shape = *it;
        
        switch ((*it)->klass_private->type)
        {
            case CP_CIRCLE_SHAPE:
            {
                float radius = PhysicsHelper::cpfloat2float(cpCircleShapeGetRadius(shape));
                Point centre = PhysicsHelper::cpv2point(cpBodyGetPos(cpShapeGetBody(shape)))
                + PhysicsHelper::cpv2point(cpCircleShapeGetOffset(shape));
                
                Point seg[4] = {};
                seg[0] = Point(centre.x - radius, centre.y - radius);
                seg[1] = Point(centre.x - radius, centre.y + radius);
                seg[2] = Point(centre.x + radius, centre.y + radius);
                seg[3] = Point(centre.x + radius, centre.y - radius);
                node->drawPolygon(seg, 4, Color4F(), 1, Color4F(1, 0, 0, 1));
                break;
            }
            case CP_SEGMENT_SHAPE:
            {
                cpSegmentShape *seg = (cpSegmentShape *)shape;
                node->drawSegment(PhysicsHelper::cpv2point(seg->ta),
                                  PhysicsHelper::cpv2point(seg->tb),
                                  PhysicsHelper::cpfloat2float(seg->r==0 ? 1 : seg->r), Color4F(1, 0, 0, 1));
                break;
            }
            case CP_POLY_SHAPE:
            {
                cpPolyShape* poly = (cpPolyShape*)shape;
                int num = poly->numVerts;
                Point* seg = new Point[num];
                
                PhysicsHelper::cpvs2points(poly->tVerts, seg, num);
                
                node->drawPolygon(seg, num, Color4F(1.0f, 0.0f, 0.0f, 0.3f), 1.0f, Color4F(1.0f, 0.0f, 0.0f, 1.0f));
                
                delete[] seg;
                break;
            }
            default:
                break;
        }
    }
}

int PhysicsWorld::collisionBeginCallback(const PhysicsContact& contact)
{
    if (_listener && _listener->onContactBegin)
    {
        return _listener->onContactBegin(contact);
    }
    
    return true;
}

int PhysicsWorld::collisionPreSolveCallback(const PhysicsContact& contact, const PhysicsContactPreSolve& solve)
{
    if (_listener && _listener->onContactPreSolve)
    {
        return _listener->onContactPreSolve(contact, solve);
    }
    
    return true;
}

void PhysicsWorld::collisionPostSolveCallback(const PhysicsContact& contact, const PhysicsContactPostSolve& solve)
{
    if (_listener && _listener->onContactPreSolve)
    {
        _listener->onContactPostSolve(contact, solve);
    }
}

void PhysicsWorld::collisionSeparateCallback(const PhysicsContact& contact)
{
    if (_listener && _listener->onContactEnd)
    {
        _listener->onContactEnd(contact);
    }
}

void PhysicsWorld::setGravity(Point gravity)
{
    if (_bodys != nullptr)
    {
        for (auto child : *_bodys)
        {
            PhysicsBody* body = dynamic_cast<PhysicsBody*>(child);
            
            // reset gravity for body
            if (!body->isGravityEnable())
            {
                body->applyForce(-_gravity);
                body->applyForce(gravity);
            }
        }
    }
    
    _gravity = gravity;
    cpSpaceSetGravity(_info->space, PhysicsHelper::point2cpv(gravity));
}

#elif (CC_PHYSICS_ENGINE == CC_PHYSICS_BOX2D)

#endif

PhysicsWorld* PhysicsWorld::create()
{
    PhysicsWorld * world = new PhysicsWorld();
    if(world && world->init())
    {
        return world;
    }
    
    CC_SAFE_DELETE(world);
    return nullptr;
}

PhysicsWorld::PhysicsWorld()
: _gravity(Point(0.0f, -98.0f))
, _speed(1.0f)
, _info(nullptr)
, _listener(nullptr)
, _bodys(nullptr)
, _scene(nullptr)
, _debugDraw(false)
, _drawNode(nullptr)
{
    
}

PhysicsWorld::~PhysicsWorld()
{
    CC_SAFE_DELETE(_info);
    CC_SAFE_RELEASE(_bodys);
}

NS_CC_END

#endif // CC_USE_PHYSICS