axmol/cocos2dx/physics/CCPhysicsWorld.cpp

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

#include "CCPhysicsBody.h"
#include "CCPhysicsShape.h"
#include "CCPhysicsContact.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/CCPhysicsHelper.h"

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

NS_CC_BEGIN

#if (CC_PHYSICS_ENGINE == CC_PHYSICS_CHIPMUNK)

namespace PhysicsInnerCallbackFunctions
{
    int 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 collisionPreSolveCallbackFunc(cpArbiter *arb, cpSpace *space, void *data)
    {
        PhysicsWorld* world = static_cast<PhysicsWorld*>(data);
        return world->collisionPreSolveCallback(*static_cast<PhysicsContact*>(arb->data),
                                                PhysicsContactPreSolve());
    }
    
    void collisionPostSolveCallbackFunc(cpArbiter *arb, cpSpace *space, void *data)
    {
        PhysicsWorld* world = static_cast<PhysicsWorld*>(data);
        world->collisionPostSolveCallback(*static_cast<PhysicsContact*>(arb->data),
                                                 PhysicsContactPostSolve());
    }
    
    void 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,
                                      PhysicsInnerCallbackFunctions::collisionBeginCallbackFunc,
                                      PhysicsInnerCallbackFunctions::collisionPreSolveCallbackFunc,
                                      PhysicsInnerCallbackFunctions::collisionPostSolveCallbackFunc,
                                      PhysicsInnerCallbackFunctions::collisionSeparateCallbackFunc,
                                      this);
    
    return true;
}

void PhysicsWorld::addShape(PhysicsShape* shape)
{
    for (auto it = shape->_info->shapes.begin(); it != shape->_info->shapes.end(); it++)
    {
        if (cpBodyIsStatic(shape->getBody()->_info->body))
        {
            cpSpaceAddStaticShape(_info->space, *it);
        }else
        {
            cpSpaceAddShape(_info->space, *it);
        }
    }
}

void PhysicsWorld::addChild(PhysicsBody* body)
{
    auto shapes = body->getShapes();
    
    // add body to space
    if (body->isDynamic())
    {
        cpSpaceAddBody(_info->space, body->_info->body);
    }
    
    // add shapes to space
    for (auto it = shapes.begin(); it != shapes.end(); it++)
    {
        addShape(*it);
    }
    
    if (_bodys == nullptr)
    {
        _bodys = Array::create(body, NULL);
        _bodys->retain();
    }else
    {
        _bodys->addObject(body);
    }
}

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

void PhysicsWorld::debugDraw()
{
    if (_debugDraw && _bodys != nullptr)
    {
        _drawNode= DrawNode::create();
        
        Object* child = nullptr;
        CCARRAY_FOREACH(_bodys, child)
        {
            PhysicsBody* body = dynamic_cast<PhysicsBody*>(child);
            
            std::vector<PhysicsShape*> shapes = body->getShapes();
            
            for (auto it = shapes.begin(); it != shapes.end(); ++it)
            {
                drawWithShape(_drawNode, *it);
            }
        }
        
        if (_scene)
        {
            _scene->addChild(_drawNode);
        }
    }
}

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

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, 0, 0, 0.3), 1, Color4F(1, 0, 0, 1));
                
                delete[] seg;
                break;
            }
            default:
                break;
        }
    }
}

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

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

void PhysicsWorld::collisionPostSolveCallback(const PhysicsContact& contact, const PhysicsContactPostSolve& solve)
{
    if (_delegate)
    {
        _delegate->onContactPostSove(contact, solve);
    }
}

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

#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)
, _delegate(nullptr)
, _bodys(nullptr)
, _scene(nullptr)
, _debugDraw(false)
, _drawNode(nullptr)
{
    
}

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

NS_CC_END

#endif // CC_USE_PHYSICS