axmol/tests/cpp-tests/Classes/PhysicsTest/PhysicsTest.cpp

#include "PhysicsTest.h"

#if CC_USE_PHYSICS

#include <cmath>
#include "ui/CocosGUI.h"
#include "../testResource.h"

USING_NS_CC;

PhysicsTests::PhysicsTests()
{
    ADD_TEST_CASE(PhysicsDemoLogoSmash);
    ADD_TEST_CASE(PhysicsDemoPyramidStack);
    ADD_TEST_CASE(PhysicsDemoClickAdd);
    ADD_TEST_CASE(PhysicsDemoRayCast);
    ADD_TEST_CASE(PhysicsDemoActions);
    ADD_TEST_CASE(PhysicsDemoJoints);
    ADD_TEST_CASE(PhysicsDemoPump);
    ADD_TEST_CASE(PhysicsDemoOneWayPlatform);
    ADD_TEST_CASE(PhysicsDemoSlice);
    ADD_TEST_CASE(PhysicsDemoBug3988);
    ADD_TEST_CASE(PhysicsContactTest);
    ADD_TEST_CASE(PhysicsPositionRotationTest);
    ADD_TEST_CASE(PhysicsSetGravityEnableTest);
    ADD_TEST_CASE(PhysicsDemoBug5482);
    ADD_TEST_CASE(PhysicsFixedUpdate);
    ADD_TEST_CASE(PhysicsTransformTest);
    ADD_TEST_CASE(PhysicsIssue9959);
    ADD_TEST_CASE(PhysicsIssue15932);
}

namespace
{
    Color4F STATIC_COLOR(1.0f, 0.0f, 0.0f, 1.0f);
    const int DRAG_BODYS_TAG = 0x80;
}

void PhysicsDemo::toggleDebug()
{
#if CC_USE_PHYSICS
    _debugDraw = !_debugDraw;
    _physicsWorld->setDebugDrawMask(_debugDraw ? PhysicsWorld::DEBUGDRAW_ALL : PhysicsWorld::DEBUGDRAW_NONE);
#endif
}


PhysicsDemo::PhysicsDemo()
: _spriteTexture(nullptr)
, _ball(nullptr)
, _debugDraw(false)
{
}

bool PhysicsDemo::init()
{
    TestCase::init();
    return initWithPhysics();
}

PhysicsDemo::~PhysicsDemo()
{
}

std::string PhysicsDemo::title() const
{
    return "PhysicsComponentTest";
}

void PhysicsDemo::onEnter()
{
    TestCase::onEnter();
    
    _spriteTexture = SpriteBatchNode::create("Images/grossini_dance_atlas.png", 100)->getTexture();
    
    // menu for debug layer
    MenuItemFont::setFontSize(18);
    auto item = MenuItemFont::create("Toggle debug", CC_CALLBACK_1(PhysicsDemo::toggleDebugCallback, this));
    
    auto menu = Menu::create(item, nullptr);
    this->addChild(menu);
    menu->setPosition(Vec2(VisibleRect::right().x - item->getContentSize().width / 2 - 10, VisibleRect::top().y - item->getContentSize().height / 2 - 10));
}

Sprite* PhysicsDemo::addGrossiniAtPosition(Vec2 p, float scale/* = 1.0*/)
{
    CCLOG("Add sprite %0.2f x %02.f", p.x, p.y);
    
    int posx, posy;
    
    posx = CCRANDOM_0_1() * 200.0f;
    posy = CCRANDOM_0_1() * 200.0f;
    
    posx = (posx % 4) * 85;
    posy = (posy % 3) * 121;
    
    auto sp = Sprite::createWithTexture(_spriteTexture, Rect(posx, posy, 85, 121));
    
    sp->setScale(scale);
    sp->setPosition(p);
    sp->addComponent(PhysicsBody::createBox(Size(48.0f, 108.0f)));
    this->addChild(sp);
    
    return sp;
}

void PhysicsDemo::toggleDebugCallback(Ref* /*sender*/)
{
    toggleDebug();
}

namespace
{
    const int LOGO_WIDTH = 188;
    const int LOGO_HEIGHT = 35;
    const int LOGO_RAW_LENGTH = 24;
    const int LOGO_IMAGE[] =
    {
        15, -16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, -64, 15, 63, -32, -2, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, -64, 15, 127, -125, -1, -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 127, -64, 15, 127, 15, -1, -64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, -64, 15, -2,
        31, -1, -64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, -64, 0, -4, 63, -1, -32, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, -64, 15, -8, 127, -1, -32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        1, -1, -64, 0, -8, -15, -1, -32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -31, -1, -64, 15, -8, -32,
        -1, -32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, -15, -1, -64, 9, -15, -32, -1, -32, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 31, -15, -1, -64, 0, -15, -32, -1, -32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 63, -7, -1, -64, 9, -29, -32, 127, -61, -16, 63, 15, -61, -1, -8, 31, -16, 15, -8, 126, 7, -31,
        -8, 31, -65, -7, -1, -64, 9, -29, -32, 0, 7, -8, 127, -97, -25, -1, -2, 63, -8, 31, -4, -1, 15, -13,
        -4, 63, -1, -3, -1, -64, 9, -29, -32, 0, 7, -8, 127, -97, -25, -1, -2, 63, -8, 31, -4, -1, 15, -13,
        -2, 63, -1, -3, -1, -64, 9, -29, -32, 0, 7, -8, 127, -97, -25, -1, -1, 63, -4, 63, -4, -1, 15, -13,
        -2, 63, -33, -1, -1, -32, 9, -25, -32, 0, 7, -8, 127, -97, -25, -1, -1, 63, -4, 63, -4, -1, 15, -13,
        -1, 63, -33, -1, -1, -16, 9, -25, -32, 0, 7, -8, 127, -97, -25, -1, -1, 63, -4, 63, -4, -1, 15, -13,
        -1, 63, -49, -1, -1, -8, 9, -57, -32, 0, 7, -8, 127, -97, -25, -8, -1, 63, -2, 127, -4, -1, 15, -13,
        -1, -65, -49, -1, -1, -4, 9, -57, -32, 0, 7, -8, 127, -97, -25, -8, -1, 63, -2, 127, -4, -1, 15, -13,
        -1, -65, -57, -1, -1, -2, 9, -57, -32, 0, 7, -8, 127, -97, -25, -8, -1, 63, -2, 127, -4, -1, 15, -13,
        -1, -1, -57, -1, -1, -1, 9, -57, -32, 0, 7, -1, -1, -97, -25, -8, -1, 63, -1, -1, -4, -1, 15, -13, -1,
        -1, -61, -1, -1, -1, -119, -57, -32, 0, 7, -1, -1, -97, -25, -8, -1, 63, -1, -1, -4, -1, 15, -13, -1,
        -1, -61, -1, -1, -1, -55, -49, -32, 0, 7, -1, -1, -97, -25, -8, -1, 63, -1, -1, -4, -1, 15, -13, -1,
        -1, -63, -1, -1, -1, -23, -49, -32, 127, -57, -1, -1, -97, -25, -1, -1, 63, -1, -1, -4, -1, 15, -13,
        -1, -1, -63, -1, -1, -1, -16, -49, -32, -1, -25, -1, -1, -97, -25, -1, -1, 63, -33, -5, -4, -1, 15,
        -13, -1, -1, -64, -1, -9, -1, -7, -49, -32, -1, -25, -8, 127, -97, -25, -1, -1, 63, -33, -5, -4, -1,
        15, -13, -1, -1, -64, -1, -13, -1, -32, -49, -32, -1, -25, -8, 127, -97, -25, -1, -2, 63, -49, -13,
        -4, -1, 15, -13, -1, -1, -64, 127, -7, -1, -119, -17, -15, -1, -25, -8, 127, -97, -25, -1, -2, 63,
        -49, -13, -4, -1, 15, -13, -3, -1, -64, 127, -8, -2, 15, -17, -1, -1, -25, -8, 127, -97, -25, -1,
        -8, 63, -49, -13, -4, -1, 15, -13, -3, -1, -64, 63, -4, 120, 0, -17, -1, -1, -25, -8, 127, -97, -25,
        -8, 0, 63, -57, -29, -4, -1, 15, -13, -4, -1, -64, 63, -4, 0, 15, -17, -1, -1, -25, -8, 127, -97,
        -25, -8, 0, 63, -57, -29, -4, -1, -1, -13, -4, -1, -64, 31, -2, 0, 0, 103, -1, -1, -57, -8, 127, -97,
        -25, -8, 0, 63, -57, -29, -4, -1, -1, -13, -4, 127, -64, 31, -2, 0, 15, 103, -1, -1, -57, -8, 127,
        -97, -25, -8, 0, 63, -61, -61, -4, 127, -1, -29, -4, 127, -64, 15, -8, 0, 0, 55, -1, -1, -121, -8,
        127, -97, -25, -8, 0, 63, -61, -61, -4, 127, -1, -29, -4, 63, -64, 15, -32, 0, 0, 23, -1, -2, 3, -16,
        63, 15, -61, -16, 0, 31, -127, -127, -8, 31, -1, -127, -8, 31, -128, 7, -128, 0, 0
    };
    
    int getPixel(int x, int y)
    {
        return (LOGO_IMAGE[(x >> 3) + y * LOGO_RAW_LENGTH] >> (~x & 0x7)) & 1;
    }
    
    float frand(void)
    {
        return rand() / RAND_MAX;
    }
}

Sprite* PhysicsDemo::makeBall(Vec2 point, float radius, PhysicsMaterial material)
{
    Sprite* ball = nullptr;
    if (_ball != nullptr)
        ball = Sprite::createWithTexture(_ball->getTexture());
    else
        ball = Sprite::create("Images/ball.png");
    
    ball->setScale(0.13f * radius);
    
    ball->addComponent(PhysicsBody::createCircle(ball->getContentSize().width / 2, material));
    ball->setPosition(Vec2(point.x, point.y));
    
    return ball;
}

Sprite* PhysicsDemo::makeBox(Vec2 point, Size size, int color, PhysicsMaterial material)
{
    bool yellow = false;
    if (color == 0)
    {
        yellow = CCRANDOM_0_1() > 0.5f;
    }
    else
    {
        yellow = color == 1;
    }
    
    auto box = yellow ? Sprite::create("Images/YellowSquare.png") : Sprite::create("Images/CyanSquare.png");
    box->setScaleX(size.width / 100.0f);
    box->setScaleY(size.height / 100.0f);
    
    box->addComponent(PhysicsBody::createBox(box->getContentSize(), material));
    
    box->setPosition(Vec2(point.x, point.y));
    
    return box;
}

Sprite* PhysicsDemo::makeTriangle(Vec2 point, Size size, int color, PhysicsMaterial material)
{
    bool yellow = false;
    if (color == 0)
    {
        yellow = CCRANDOM_0_1() > 0.5f;
    }
    else
    {
        yellow = color == 1;
    }
    
    auto triangle = yellow ? Sprite::create("Images/YellowTriangle.png") : Sprite::create("Images/CyanTriangle.png");
    
    if (size.height == 0)
    {
        triangle->setScale(size.width / 100.0f);
    }
    else
    {
        triangle->setScaleX(size.width / 50.0f);
        triangle->setScaleY(size.height / 43.5f);
    }
    
    Vec2 vers[] = { Vec2(0, triangle->getContentSize().height / 2), Vec2(triangle->getContentSize().width / 2, -triangle->getContentSize().height / 2), Vec2(-triangle->getContentSize().width / 2, -triangle->getContentSize().height / 2) };
    
    triangle->addComponent(PhysicsBody::createPolygon(vers, 3, material));
    triangle->setPosition(Vec2(point.x, point.y));
    
    return triangle;
}

bool PhysicsDemo::onTouchBegan(Touch* touch, Event* event)
{
    auto location = touch->getLocation();
    auto arr = _physicsWorld->getShapes(location);
    
    PhysicsBody* body = nullptr;
    for (auto& obj : arr)
    {
        if ((obj->getBody()->getTag() & DRAG_BODYS_TAG) != 0)
        {
            body = obj->getBody();
            break;
        }
    }
    
    if (body != nullptr)
    {
        Node* mouse = Node::create();
        auto physicsBody = PhysicsBody::create(PHYSICS_INFINITY, PHYSICS_INFINITY);
        physicsBody->setDynamic(false);
        mouse->addComponent(physicsBody);
        mouse->setPosition(location);
        this->addChild(mouse);
        PhysicsJointPin* joint = PhysicsJointPin::construct(physicsBody, body, location);
        joint->setMaxForce(5000.0f * body->getMass());
        _physicsWorld->addJoint(joint);
        _mouses.insert(std::make_pair(touch->getID(), mouse));
        
        return true;
    }
    
    return false;
}

void PhysicsDemo::onTouchMoved(Touch* touch, Event* /*event*/)
{
    auto it = _mouses.find(touch->getID());
    
    if (it != _mouses.end())
    {
        it->second->setPosition(touch->getLocation());
    }
}

void PhysicsDemo::onTouchEnded(Touch* touch, Event* /*event*/)
{
    auto it = _mouses.find(touch->getID());
    
    if (it != _mouses.end())
    {
        this->removeChild(it->second);
        _mouses.erase(it);
    }
}

// Implementation of PhysicsComponentDemoLogoSmash

void PhysicsDemoLogoSmash::onEnter()
{
    PhysicsDemo::onEnter();
    
    _physicsWorld->setGravity(Vec2(0, 0));
    _physicsWorld->setUpdateRate(5.0f);
    
    _ball = SpriteBatchNode::create("Images/ball.png", sizeof(LOGO_IMAGE)/sizeof(LOGO_IMAGE[0]));
    addChild(_ball);
    for (int y = 0; y < LOGO_HEIGHT; ++y)
    {
        for (int x = 0; x < LOGO_WIDTH; ++x)
        {
            if (getPixel(x, y))
            {
                float xJitter = 0.05 * frand();
                float yJitter = 0.05 * frand();
                
                Node* ball = makeBall(Vec2(2*(x - LOGO_WIDTH/2 + xJitter) + VisibleRect::getVisibleRect().size.width/2,
                                           2*(LOGO_HEIGHT-y + yJitter) + VisibleRect::getVisibleRect().size.height/2 - LOGO_HEIGHT/2),
                                      0.95f, PhysicsMaterial(0.01f, 0.0f, 0.0f));
                
                auto physicsBody = ball->getPhysicsBody();
                physicsBody->setMass(1.0);
                physicsBody->setMoment(PHYSICS_INFINITY);
                
                _ball->addChild(ball);
            }
        }
    }
    
    
    auto bullet = makeBall(Vec2(400, 0), 10, PhysicsMaterial(PHYSICS_INFINITY, 0, 0));
    bullet->getPhysicsBody()->setVelocity(Vec2(200, 0));
    
    bullet->setPosition(Vec2(-500, VisibleRect::getVisibleRect().size.height/2));
    
    _ball->addChild(bullet);
}

std::string PhysicsDemoLogoSmash::title() const
{
    return "Logo Smash";
}

// Implementation of PhysicsComponentDemoClickAdd

PhysicsDemoClickAdd::~PhysicsDemoClickAdd()
{
    Device::setAccelerometerEnabled(false);
}

void PhysicsDemoClickAdd::onEnter()
{
    PhysicsDemo::onEnter();
    
    auto touchListener = EventListenerTouchAllAtOnce::create();
    touchListener->onTouchesEnded = CC_CALLBACK_2(PhysicsDemoClickAdd::onTouchesEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    Device::setAccelerometerEnabled(true);
    auto accListener = EventListenerAcceleration::create(CC_CALLBACK_2(PhysicsDemoClickAdd::onAcceleration, this));
    _eventDispatcher->addEventListenerWithSceneGraphPriority(accListener, this);
    
    auto node = Node::create();
    node->addComponent(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size));
    node->setPosition(VisibleRect::center());
    this->addChild(node);
    
    addGrossiniAtPosition(VisibleRect::center());
}

std::string PhysicsDemoClickAdd::subtitle() const
{
    return "multi touch to add grossini";
}

void PhysicsDemoClickAdd::onTouchesEnded(const std::vector<Touch*>& touches, Event* /*event*/)
{
    //Add a new body/atlas sprite at the touched location
    
    for( auto touch: touches)
    {
        auto location = touch->getLocation();
        
        addGrossiniAtPosition( location );
    }
}

void PhysicsDemoClickAdd::onAcceleration(Acceleration* acc, Event* /*event*/)
{
    static float prevX=0, prevY=0;
    
#define FILTER_FACTOR 0.05f
    
    float accelX = (float) acc->x * FILTER_FACTOR + (1- FILTER_FACTOR)*prevX;
    float accelY = (float) acc->y * FILTER_FACTOR + (1- FILTER_FACTOR)*prevY;
    
    prevX = accelX;
    prevY = accelY;
    
    auto v = Vec2( accelX, accelY);
    v = v * 200;
    
    _physicsWorld->setGravity(v);
}

void PhysicsDemoPyramidStack::onEnter()
{
    PhysicsDemo::onEnter();
    
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = CC_CALLBACK_2(PhysicsDemoPyramidStack::onTouchBegan, this);
    touchListener->onTouchMoved = CC_CALLBACK_2(PhysicsDemoPyramidStack::onTouchMoved, this);
    touchListener->onTouchEnded = CC_CALLBACK_2(PhysicsDemoPyramidStack::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    auto node = Node::create();
    node->addComponent(PhysicsBody::createEdgeSegment(VisibleRect::leftBottom() + Vec2(0, 50), 
        VisibleRect::rightBottom() + Vec2(0, 50)));
    this->addChild(node);
    
    auto ball = Sprite::create("Images/ball.png");
    ball->setScale(1);
    ball->setTag(100);
    auto body = PhysicsBody::createCircle(10);
    ball->addComponent(body);
    body->setTag(DRAG_BODYS_TAG);
    ball->setPosition(VisibleRect::bottom() + Vec2(0, 60));
    this->addChild(ball);
    
    scheduleOnce(CC_SCHEDULE_SELECTOR(PhysicsDemoPyramidStack::updateOnce), 3.0);
    
    for (int i = 0; i < 14; i++)
    {
        for (int j = 0; j <= i; j++)
        {
            auto sp = addGrossiniAtPosition(VisibleRect::bottom() + Vec2((i / 2 - j) * 11, (14 - i) * 23 + 100), 0.2f);
            sp->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
        }
    }
}

void PhysicsDemoPyramidStack::updateOnce(float /*delta*/)
{
    auto ball = getChildByTag(100);
    if (ball)
        ball->setScale(ball->getScale() * 3);
}

std::string PhysicsDemoPyramidStack::title() const
{
    return "Pyramid Stack";
}

PhysicsDemoRayCast::PhysicsDemoRayCast()
: _angle(0.0f)
, _node(nullptr)
, _mode(0)
{}

void PhysicsDemoRayCast::onEnter()
{
    PhysicsDemo::onEnter();
    
    auto listener = EventListenerTouchAllAtOnce::create();
    listener->onTouchesEnded = CC_CALLBACK_2(PhysicsDemoRayCast::onTouchesEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
    
    _physicsWorld->setGravity(Point::ZERO);
    
    auto node = DrawNode::create();
    node->addComponent(PhysicsBody::createEdgeSegment(VisibleRect::leftBottom() + Vec2(0, 50), VisibleRect::rightBottom() + Vec2(0, 50)));
    node->drawSegment(VisibleRect::leftBottom() + Vec2(0, 50), VisibleRect::rightBottom() + Vec2(0, 50), 1, STATIC_COLOR);
    this->addChild(node);
    
    MenuItemFont::setFontSize(18);
    auto item = MenuItemFont::create("Change Mode(any)", CC_CALLBACK_1(PhysicsDemoRayCast::changeModeCallback, this));
    
    auto menu = Menu::create(item, nullptr);
    this->addChild(menu);
    menu->setPosition(Vec2(VisibleRect::left().x + 100, VisibleRect::top().y - 10));
    
    scheduleUpdate();
}

void PhysicsDemoRayCast::changeModeCallback(Ref* sender)
{
    _mode = (_mode + 1) % 3;
    
    switch (_mode)
    {
        case 0:
            ((MenuItemFont*)sender)->setString("Change Mode(any)");
            break;
        case 1:
            ((MenuItemFont*)sender)->setString("Change Mode(nearest)");
            break;
        case 2:
            ((MenuItemFont*)sender)->setString("Change Mode(multiple)");
            break;
            
        default:
            break;
    }
}

bool PhysicsDemoRayCast::anyRay(PhysicsWorld& /*world*/, const PhysicsRayCastInfo& info, void* data)
{
    *((Vec2*)data) = info.contact;
    return false;
}

void PhysicsDemoRayCast::update(float /*delta*/)
{
    float L = 150.0f;
    Vec2 point1 = VisibleRect::center();
    Vec2 d(L * cosf(_angle), L * sinf(_angle));
    Vec2 point2 = point1 + d;
    
    removeChild(_node);
    _node = DrawNode::create();
    switch (_mode)
    {
        case 0:
        {
            Vec2 point3 = point2;
            auto func = CC_CALLBACK_3(PhysicsDemoRayCast::anyRay, this);
            
            _physicsWorld->rayCast(func, point1, point2, &point3);
            _node->drawSegment(point1, point3, 1, STATIC_COLOR);
            
            if (point2 != point3)
            {
                _node->drawDot(point3, 2, Color4F(1.0f, 1.0f, 1.0f, 1.0f));
            }
            addChild(_node);
            
            break;
        }
        case 1:
        {
            Vec2 point3 = point2;
            float friction = 1.0f;
            PhysicsRayCastCallbackFunc func = [&point3, &friction](PhysicsWorld& /*world*/, const PhysicsRayCastInfo& info, void* /*data*/)->bool
            {
                if (friction > info.fraction)
                {
                    point3 = info.contact;
                    friction = info.fraction;
                }
                
                return true;
            };
            
            _physicsWorld->rayCast(func, point1, point2, nullptr);
            _node->drawSegment(point1, point3, 1, STATIC_COLOR);
            
            if (point2 != point3)
            {
                _node->drawDot(point3, 2, Color4F(1.0f, 1.0f, 1.0f, 1.0f));
            }
            addChild(_node);
            
            break;
        }
        case 2:
        {
#define MAX_MULTI_RAYCAST_NUM 5
            Vec2 points[MAX_MULTI_RAYCAST_NUM];
            int num = 0;
            
            PhysicsRayCastCallbackFunc func = [&points, &num](PhysicsWorld& /*world*/, const PhysicsRayCastInfo& info, void* /*data*/)->bool
            {
                if (num < MAX_MULTI_RAYCAST_NUM)
                {
                    points[num++] = info.contact;
                }
                
                return true;
            };
            
            _physicsWorld->rayCast(func, point1, point2, nullptr);
            
            _node->drawSegment(point1, point2, 1, STATIC_COLOR);
            
            for (int i = 0; i < num; ++i)
            {
                _node->drawDot(points[i], 2, Color4F(1.0f, 1.0f, 1.0f, 1.0f));
            }
            
            addChild(_node);
            
            break;
        }
            
        default:
            break;
    }
    
    _angle += 0.25f * (float)M_PI / 180.0f;
}

void PhysicsDemoRayCast::onTouchesEnded(const std::vector<Touch*>& touches, Event* /*event*/)
{
    //Add a new body/atlas sprite at the touched location
    
    for (auto &touch : touches)
    {
        auto location = touch->getLocation();
        
        float r = CCRANDOM_0_1();
        
        if (r < 1.0f / 3.0f)
        {
            addChild(makeBall(location, 5 + CCRANDOM_0_1() * 10));
        }
        else if (r < 2.0f / 3.0f)
        {
            addChild(makeBox(location, Size(10 + CCRANDOM_0_1() * 15, 10 + CCRANDOM_0_1() * 15)));
        }
        else
        {
            addChild(makeTriangle(location, Size(10 + CCRANDOM_0_1() * 20, 10 + CCRANDOM_0_1() * 20)));
        }
    }
}

std::string PhysicsDemoRayCast::title() const
{
    return "Ray Cast";
}

void PhysicsDemoActions::onEnter()
{
    PhysicsDemo::onEnter();
    _physicsWorld->setGravity(Vec2::ZERO);
    
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = CC_CALLBACK_2(PhysicsDemoActions::onTouchBegan, this);
    touchListener->onTouchMoved = CC_CALLBACK_2(PhysicsDemoActions::onTouchMoved, this);
    touchListener->onTouchEnded = CC_CALLBACK_2(PhysicsDemoActions::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    auto node = Node::create();
    node->addComponent(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size));
    node->setPosition(VisibleRect::center());
    this->addChild(node);
    
    Sprite* sp1 = addGrossiniAtPosition(VisibleRect::center());
    Sprite* sp2 = addGrossiniAtPosition(VisibleRect::left() + Vec2(50, 0));
    Sprite* sp3 = addGrossiniAtPosition(VisibleRect::right() - Vec2(20, 0));
    Sprite* sp4 = addGrossiniAtPosition(VisibleRect::leftTop() + Vec2(50, -50));
    sp4->getPhysicsBody()->setGravityEnable(false);
    
    sp1->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    sp2->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    sp3->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    sp4->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    
    auto actionTo = JumpTo::create(2, Vec2(100, 100), 50, 4);
    auto actionBy = JumpBy::create(2, Vec2(300, 0), 50, 4);
    auto actionUp = JumpBy::create(2, Vec2(0, 50), 80, 4);
    auto actionByBack = actionBy->reverse();
    auto rotateBy = RotateBy::create(2, 180);
    auto rotateByBack = RotateBy::create(2, -180);
    
    sp1->runAction(RepeatForever::create(actionUp));
    sp2->runAction(RepeatForever::create(Sequence::create(actionBy, actionByBack, nullptr)));
    sp3->runAction(actionTo);
    sp4->runAction(RepeatForever::create(Sequence::create(rotateBy, rotateByBack, nullptr)));
}

std::string PhysicsDemoActions::title() const
{
    return "Actions";
}

// implementation of PhysicsDemoJoints


void PhysicsDemoJoints::onEnter()
{
    PhysicsDemo::onEnter();
    toggleDebug();
    
    auto listener = EventListenerTouchOneByOne::create();
    listener->onTouchBegan = CC_CALLBACK_2(PhysicsDemo::onTouchBegan, this);
    listener->onTouchMoved = CC_CALLBACK_2(PhysicsDemo::onTouchMoved, this);
    listener->onTouchEnded = CC_CALLBACK_2(PhysicsDemo::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
    
    float width = (VisibleRect::getVisibleRect().size.width - 10) / 4;
    float height = (VisibleRect::getVisibleRect().size.height - 50) / 4;
    
    Node* node = Node::create();
    PhysicsBody* box = PhysicsBody::create();
    node->addComponent(box);
    
    box->setDynamic(false);
    node->setPosition(Point::ZERO);
    this->addChild(node);
    
    for (int i = 0; i < 4; ++i)
    {
        for (int j = 0; j < 4; ++j)
        {
            Vec2 offset(VisibleRect::leftBottom().x + 5 + j * width + width/2, VisibleRect::leftBottom().y + 50 + i * height + height/2);
            box->addShape(PhysicsShapeEdgeBox::create(Size(width, height), PHYSICSSHAPE_MATERIAL_DEFAULT, 1, offset));
            
            switch (i*4 + j)
            {
                case 0:
                {
                    auto sp1 = makeBall(offset - Vec2(30, 0), 10);
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBall(offset + Vec2(30, 0), 10);
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    PhysicsJointPin* joint = PhysicsJointPin::construct(sp1PhysicsBody, sp2PhysicsBody, offset);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 1:
                {
                    
                    auto sp1 = makeBall(offset - Vec2(30, 0), 10);
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    PhysicsJointFixed* joint = PhysicsJointFixed::construct(sp1PhysicsBody, sp2PhysicsBody, offset);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 2:
                {
                    auto sp1 = makeBall(offset - Vec2(30, 0), 10);
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    PhysicsJointDistance* joint = PhysicsJointDistance::construct(sp1PhysicsBody, sp2PhysicsBody, Point::ZERO, Point::ZERO);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 3:
                {
                    auto sp1 = makeBall(offset - Vec2(30, 0), 10);
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    PhysicsJointLimit* joint = PhysicsJointLimit::construct(sp1PhysicsBody, sp2PhysicsBody, Point::ZERO, Point::ZERO, 30.0f, 60.0f);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 4:
                {
                    auto sp1 = makeBall(offset - Vec2(30, 0), 10);
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    PhysicsJointSpring* joint = PhysicsJointSpring::construct(sp1PhysicsBody, sp2PhysicsBody, Point::ZERO, Point::ZERO, 500.0f, 0.3f);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 5:
                {
                    auto sp1 = makeBall(offset - Vec2(30, 0), 10);
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    PhysicsJointGroove* joint = PhysicsJointGroove::construct(sp1PhysicsBody, sp2PhysicsBody, Vec2(30, 15), Vec2(30, -15), Vec2(-30, 0));
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 6:
                {
                    auto sp1 = makeBox(offset - Vec2(30, 0), Size(30, 10));
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp1PhysicsBody, box, sp1->getPosition()));
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp2PhysicsBody, box, sp2->getPosition()));
                    PhysicsJointRotarySpring* joint = PhysicsJointRotarySpring::construct(sp1PhysicsBody, sp2PhysicsBody, 3000.0f, 60.0f);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 7:
                {
                    auto sp1 = makeBox(offset - Vec2(30, 0), Size(30, 10));
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp1PhysicsBody, box, sp1->getPosition()));
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp2PhysicsBody, box, sp2->getPosition()));
                    PhysicsJointRotaryLimit* joint = PhysicsJointRotaryLimit::construct(sp1PhysicsBody, sp2PhysicsBody, 0.0f,(float) M_PI_2);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 8:
                {
                    auto sp1 = makeBox(offset - Vec2(30, 0), Size(30, 10));
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp1PhysicsBody, box, sp1->getPosition()));
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp2PhysicsBody, box, sp2->getPosition()));
                    PhysicsJointRatchet* joint = PhysicsJointRatchet::construct(sp1PhysicsBody, sp2PhysicsBody, 0.0f, (float)M_PI_2);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 9:
                {
                    auto sp1 = makeBox(offset - Vec2(30, 0), Size(30, 10));
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp1PhysicsBody, box, sp1->getPosition()));
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp2PhysicsBody, box, sp2->getPosition()));
                    PhysicsJointGear* joint = PhysicsJointGear::construct(sp1PhysicsBody, sp2PhysicsBody, 0.0f, 2.0f);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                case 10:
                {
                    auto sp1 = makeBox(offset - Vec2(30, 0), Size(30, 10));
                    auto sp1PhysicsBody = sp1->getPhysicsBody();
                    sp1PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    auto sp2 = makeBox(offset + Vec2(30, 0), Size(30, 10));
                    auto sp2PhysicsBody = sp2->getPhysicsBody();
                    sp2PhysicsBody->setTag(DRAG_BODYS_TAG);
                    
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp1PhysicsBody, box, sp1->getPosition()));
                    getPhysicsWorld()->addJoint(PhysicsJointPin::construct(sp2PhysicsBody, box, sp2->getPosition()));
                    PhysicsJointMotor* joint = PhysicsJointMotor::construct(sp1PhysicsBody, sp2PhysicsBody, (float)M_PI_2);
                    getPhysicsWorld()->addJoint(joint);
                    
                    this->addChild(sp1);
                    this->addChild(sp2);
                    break;
                }
                default:
                    break;
            }
        }
    }
}

std::string PhysicsDemoJoints::title() const
{
    return "Joints";
}

void PhysicsDemoPump::onEnter()
{
    PhysicsDemo::onEnter();
    toggleDebug();
    
    _distance = 0.0f;
    _rotationV = 0.0f;
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = CC_CALLBACK_2(PhysicsDemoPump::onTouchBegan, this);
    touchListener->onTouchMoved = CC_CALLBACK_2(PhysicsDemoPump::onTouchMoved, this);
    touchListener->onTouchEnded = CC_CALLBACK_2(PhysicsDemoPump::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    scheduleUpdate();
    
    auto node = Node::create();
    auto nodeBody = PhysicsBody::create();
    node->addComponent(nodeBody);
    nodeBody->setDynamic(false);
    
    PhysicsMaterial staticMaterial(PHYSICS_INFINITY, 0, 0.5f);
    nodeBody->addShape(PhysicsShapeEdgeSegment::create(VisibleRect::leftTop() + Vec2(50, 0), VisibleRect::leftTop() + Vec2(50, -130), staticMaterial, 2.0f));
    nodeBody->addShape(PhysicsShapeEdgeSegment::create(VisibleRect::leftTop() + Vec2(190, 0), VisibleRect::leftTop() + Vec2(100, -50), staticMaterial, 2.0f));
    nodeBody->addShape(PhysicsShapeEdgeSegment::create(VisibleRect::leftTop() + Vec2(100, -50), VisibleRect::leftTop() + Vec2(100, -90), staticMaterial, 2.0f));
    nodeBody->addShape(PhysicsShapeEdgeSegment::create(VisibleRect::leftTop() + Vec2(50, -130), VisibleRect::leftTop() + Vec2(100, -145), staticMaterial, 2.0f));
    nodeBody->addShape(PhysicsShapeEdgeSegment::create(VisibleRect::leftTop() + Vec2(100, -145), VisibleRect::leftBottom() + Vec2(100, 80), staticMaterial, 2.0f));
    nodeBody->addShape(PhysicsShapeEdgeSegment::create(VisibleRect::leftTop() + Vec2(150, -80), VisibleRect::leftBottom() + Vec2(150, 80), staticMaterial, 2.0f));
    nodeBody->addShape(PhysicsShapeEdgeSegment::create(VisibleRect::leftTop() + Vec2(150, -80), VisibleRect::rightTop() + Vec2(-100, -150), staticMaterial, 2.0f));
    
    nodeBody->setCategoryBitmask(0x01);
    node->setPosition(Vec2::ZERO);
    this->addChild(node);
    
    // balls
    for (int i = 0; i < 6; ++i)
    {
        auto ball = makeBall(VisibleRect::leftTop() + Vec2(75 + CCRANDOM_0_1() * 90, 0), 22, PhysicsMaterial(0.05f, 0.0f, 0.1f));
        ball->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
        addChild(ball);
    }
    
    Vec2 vec[4] =
    {
        VisibleRect::leftTop() + Vec2(102, -148),
        VisibleRect::leftTop() + Vec2(148, -161),
        VisibleRect::leftBottom() + Vec2(148, 20),
        VisibleRect::leftBottom() + Vec2(102, 20)
    };
    
    // pump
    auto pump = Node::create();
    auto center = PhysicsShape::getPolygonCenter(vec, 4);
    pump->setPosition(center);
    auto pumpBody = PhysicsBody::createPolygon(vec, 4, PHYSICSBODY_MATERIAL_DEFAULT, -center);
    pump->addComponent(pumpBody);
    this->addChild(pump);
    pumpBody->setCategoryBitmask(0x02);
    pumpBody->setGravityEnable(false);
    
    // small gear 
    auto sgearBody = PhysicsBody::createCircle(44);
    sgearBody->setCategoryBitmask(0x04);
    sgearBody->setCollisionBitmask(0x04);
    sgearBody->setTag(1);
    auto sgear = Node::create();
    sgear->addComponent(sgearBody);
    sgear->setPosition(VisibleRect::leftBottom() + Vec2(125, 0));
    this->addChild(sgear);
    
    _physicsWorld->addJoint(PhysicsJointPin::construct(nodeBody, sgearBody, sgear->getPosition()));
    _physicsWorld->addJoint(PhysicsJointDistance::construct(pumpBody, sgearBody, Vec2(0, 0), Vec2(0, -44)));
    
    // big gear 
    auto bgearBody = PhysicsBody::createCircle(100);
    bgearBody->setCategoryBitmask(0x04);
    auto bgear = Node::create();
    bgear->addComponent(bgearBody);
    bgear->setPosition(VisibleRect::leftBottom() + Vec2(275, 0));
    this->addChild(bgear);
    
    _physicsWorld->addJoint(PhysicsJointPin::construct(bgearBody, nodeBody, bgear->getPosition()));
    _physicsWorld->addJoint(PhysicsJointGear::construct(sgearBody, bgearBody, (float)-M_PI_2, -2.0f));
    
    // plugger
    Vec2 seg[] = { VisibleRect::leftTop() + Vec2(75, -120), VisibleRect::leftBottom() + Vec2(75, -100) };
    Vec2 segCenter = (seg[1] + seg[0]) / 2;
    seg[1] -= segCenter;
    seg[0] -= segCenter;
    
    auto pluggerBody = PhysicsBody::createEdgeSegment(seg[0], seg[1], PhysicsMaterial(0.01f, 0.0f, 0.5f), 20);
    pluggerBody->setDynamic(true);
    pluggerBody->setMass(30);
    pluggerBody->setMoment(100000);
    pluggerBody->setCategoryBitmask(0x02);
    auto plugger = Node::create();
    plugger->addComponent(pluggerBody);
    plugger->setPosition(segCenter);
    this->addChild(plugger);
    
    sgearBody->setCollisionBitmask(0x04 | 0x01);
    _physicsWorld->addJoint(PhysicsJointPin::construct(nodeBody, pluggerBody, VisibleRect::leftBottom() + Vec2(75, -90)));
    _physicsWorld->addJoint(PhysicsJointDistance::construct(pluggerBody, sgearBody, Vec2::ZERO, Vec2(44, 0)));
}

void PhysicsDemoPump::update(float delta)
{
    for (const auto& body : _physicsWorld->getAllBodies())
    {
        if (body->getTag() == DRAG_BODYS_TAG && body->getPosition().y < 0.0f)
        {
            if (body->getNode()!=nullptr)
            {
                body->getNode()->setPosition(VisibleRect::leftTop() + Vec2(75 + CCRANDOM_0_1() * 90, 0));
            }
            
            body->setVelocity(Vec2(0, 0));
        }
    }
    
    PhysicsBody* gear = _physicsWorld->getBody(1);
    
    if (gear != nullptr)
    {
        if (_distance != 0.0f)
        {
            _rotationV += _distance / 2500.0f;
            
            if (_rotationV > 30) _rotationV = 30.0f;
            if (_rotationV < -30) _rotationV = -30.0f;
        }
        
        gear->setAngularVelocity(_rotationV);
        _rotationV *= 0.995f;
    }
}

bool PhysicsDemoPump::onTouchBegan(Touch* touch, Event* event)
{
    PhysicsDemo::onTouchBegan(touch, event);
    
    _distance = touch->getLocation().x - VisibleRect::center().x;
    
    return true;
}

void PhysicsDemoPump::onTouchMoved(Touch* touch, Event* event)
{
    PhysicsDemo::onTouchMoved(touch, event);
    
    _distance = touch->getLocation().x - VisibleRect::center().x;
}

void PhysicsDemoPump::onTouchEnded(Touch* touch, Event* event)
{
    PhysicsDemo::onTouchEnded(touch, event);
    
    _distance = 0;
}

std::string PhysicsDemoPump::title() const
{
    return "Pump";
}

std::string PhysicsDemoPump::subtitle() const
{
    return "touch screen on left or right";
}

void PhysicsDemoOneWayPlatform::onEnter()
{
    PhysicsDemo::onEnter();
    
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = CC_CALLBACK_2(PhysicsDemoOneWayPlatform::onTouchBegan, this);
    touchListener->onTouchMoved = CC_CALLBACK_2(PhysicsDemoOneWayPlatform::onTouchMoved, this);
    touchListener->onTouchEnded = CC_CALLBACK_2(PhysicsDemoOneWayPlatform::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    auto ground = Node::create();
    ground->addComponent(PhysicsBody::createEdgeSegment(VisibleRect::leftBottom() + Vec2(0, 50), 
        VisibleRect::rightBottom() + Vec2(0, 50)));
    this->addChild(ground);
    
    auto platform = makeBox(VisibleRect::center(), Size(200, 50));
    auto platformBody = platform->getPhysicsBody();
    platformBody->setDynamic(false);
    platformBody->setContactTestBitmask(0xFFFFFFFF);
    this->addChild(platform);
    
    auto ball = makeBall(VisibleRect::center() - Vec2(0, 50), 20);
    auto ballBody = ball->getPhysicsBody();
    ballBody->setVelocity(Vec2(0, 150));
    ballBody->setTag(DRAG_BODYS_TAG);
    ballBody->setMass(1.0f);
    ballBody->setContactTestBitmask(0xFFFFFFFF);
    this->addChild(ball);
    
    auto contactListener = EventListenerPhysicsContactWithBodies::create(platformBody, ballBody);
    contactListener->onContactBegin = CC_CALLBACK_1(PhysicsDemoOneWayPlatform::onContactBegin, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(contactListener, this);
}

bool PhysicsDemoOneWayPlatform::onContactBegin(PhysicsContact& contact)
{
    return contact.getContactData()->normal.y < 0;
}

std::string PhysicsDemoOneWayPlatform::title() const
{
    return "One Way Platform";
}

void PhysicsDemoSlice::onEnter()
{
    PhysicsDemo::onEnter();
    toggleDebug();
    
    _sliceTag = 1;
    
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = [](Touch* /*touch*/, Event* /*event*/)->bool{ return true; };
    touchListener->onTouchEnded = CC_CALLBACK_2(PhysicsDemoSlice::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    auto ground = Node::create();
    ground->addComponent(PhysicsBody::createEdgeSegment(VisibleRect::leftBottom() + Vec2(0, 50), VisibleRect::rightBottom() + Vec2(0, 50)));
    this->addChild(ground);
    
    auto box = Node::create();
    Vec2 points[4] = {Vec2(-100, -100), Vec2(-100, 100), Vec2(100, 100), Vec2(100, -100)};
    box->addComponent(PhysicsBody::createPolygon(points, 4));
    box->setPosition(VisibleRect::center());
    box->getPhysicsBody()->setTag(_sliceTag);
    addChild(box);
}

bool PhysicsDemoSlice::slice(PhysicsWorld &/*world*/, const PhysicsRayCastInfo& info, void* /*data*/)
{
    if (info.shape->getBody()->getTag() != _sliceTag)
    {
        return true;
    }
    
    if (!info.shape->containsPoint(info.start) && !info.shape->containsPoint(info.end))
    {
        Vec2 normal = info.end - info.start;
        normal = normal.getPerp().getNormalized();
        float dist = info.start.dot(normal);
        
        clipPoly(dynamic_cast<PhysicsShapePolygon*>(info.shape), normal, dist);
        clipPoly(dynamic_cast<PhysicsShapePolygon*>(info.shape), -normal, -dist);
        
        info.shape->getBody()->removeFromWorld();
    }
    
    return true;
}

void PhysicsDemoSlice::clipPoly(PhysicsShapePolygon* shape, Vec2 normal, float distance)
{
    PhysicsBody* body = shape->getBody();
    int count = shape->getPointsCount();
    int pointsCount = 0;
    Vec2* points = new (std::nothrow) Vec2[count + 1];
    
    for (int i=0, j=count-1; i<count; j=i, ++i)
    {
        Vec2 a = body->local2World(shape->getPoint(j));
        float aDist = a.dot(normal) - distance;
        
        if (aDist < 0.0f)
        {
            points[pointsCount] = a;
            ++pointsCount;
        }
        
        Vec2 b = body->local2World(shape->getPoint(i));
        float bDist = b.dot(normal) - distance;
        
        if (aDist*bDist < 0.0f)
        {
            float t = std::fabs(aDist)/(std::fabs(aDist) + std::fabs(bDist));
            points[pointsCount] = a.lerp(b, t);
            ++pointsCount;
        }
    }
    
    Vec2 center = PhysicsShape::getPolygonCenter(points, pointsCount);
    Node* node = Node::create();
    PhysicsBody* polygon = PhysicsBody::createPolygon(points, pointsCount, PHYSICSBODY_MATERIAL_DEFAULT, -center);
    node->setPosition(center);
    node->addComponent(polygon);
    polygon->setVelocity(body->getVelocityAtWorldPoint(center));
    polygon->setAngularVelocity(body->getAngularVelocity());
    polygon->setTag(_sliceTag);
    addChild(node);
    
    delete[] points;
}

void PhysicsDemoSlice::onTouchEnded(Touch *touch, Event* /*event*/)
{
    auto func = CC_CALLBACK_3(PhysicsDemoSlice::slice, this);
    getPhysicsWorld()->rayCast(func, touch->getStartLocation(), touch->getLocation(), nullptr);
}

std::string PhysicsDemoSlice::title() const
{
    return "Slice";
}

std::string PhysicsDemoSlice::subtitle() const
{
    return "click and drag to slice up the block";
}

void PhysicsDemoBug3988::onEnter()
{
    PhysicsDemo::onEnter();
    toggleDebug();
    _physicsWorld->setGravity(Vec2::ZERO);
    
    auto ball  = Sprite::create("Images/YellowSquare.png");
    ball->setPosition(VisibleRect::center() - Vec2(100, 0));
    ball->setRotation(30.0f);
    this->addChild(ball);
    
    auto physicsBall = makeBox(VisibleRect::center() + Vec2(100, 0), Size(100, 100));
    physicsBall->setRotation(30.0f);
    this->addChild(physicsBall);
}

std::string PhysicsDemoBug3988::title() const
{
    return "Bug3988";
}

std::string PhysicsDemoBug3988::subtitle() const
{
    return "All the Rectangles should have same rotation angle";
}

void PhysicsContactTest::onEnter()
{
    PhysicsDemo::onEnter();
    _physicsWorld->setGravity(Vec2::ZERO);
    auto s = VisibleRect::getVisibleRect().size;
    
    _yellowBoxNum = 50;
    _blueBoxNum = 50;
    _yellowTriangleNum = 50;
    _blueTriangleNum = 50;
    
    
    MenuItemFont::setFontSize(65);
    auto decrease1 = MenuItemFont::create(" - ", CC_CALLBACK_1(PhysicsContactTest::onDecrease, this));
    decrease1->setColor(Color3B(0, 200, 20));
    auto increase1 = MenuItemFont::create(" + ", CC_CALLBACK_1(PhysicsContactTest::onIncrease, this));
    increase1->setColor(Color3B(0, 200, 20));
    decrease1->setTag(1);
    increase1->setTag(1);
    
    auto menu1 = Menu::create(decrease1, increase1, nullptr);
    menu1->alignItemsHorizontally();
    menu1->setPosition(Vec2(s.width / 2, s.height - 50));
    addChild(menu1, 1);
    
    auto label = Label::createWithTTF("yellow box", "fonts/arial.ttf", 32);
    addChild(label, 1);
    label->setPosition(Vec2(s.width / 2 - 150, s.height - 50));
    
    auto decrease2 = MenuItemFont::create(" - ", CC_CALLBACK_1(PhysicsContactTest::onDecrease, this));
    decrease2->setColor(Color3B(0, 200, 20));
    auto increase2 = MenuItemFont::create(" + ", CC_CALLBACK_1(PhysicsContactTest::onIncrease, this));
    increase2->setColor(Color3B(0, 200, 20));
    decrease2->setTag(2);
    increase2->setTag(2);
    
    auto menu2 = Menu::create(decrease2, increase2, nullptr);
    menu2->alignItemsHorizontally();
    menu2->setPosition(Vec2(s.width / 2, s.height - 90));
    addChild(menu2, 1);
    
    label = Label::createWithTTF("blue box", "fonts/arial.ttf", 32);
    addChild(label, 1);
    label->setPosition(Vec2(s.width / 2 - 150, s.height - 90));
    
    auto decrease3 = MenuItemFont::create(" - ", CC_CALLBACK_1(PhysicsContactTest::onDecrease, this));
    decrease3->setColor(Color3B(0, 200, 20));
    auto increase3 = MenuItemFont::create(" + ", CC_CALLBACK_1(PhysicsContactTest::onIncrease, this));
    increase3->setColor(Color3B(0, 200, 20));
    decrease3->setTag(3);
    increase3->setTag(3);
    
    auto menu3 = Menu::create(decrease3, increase3, nullptr);
    menu3->alignItemsHorizontally();
    menu3->setPosition(Vec2(s.width / 2, s.height - 130));
    addChild(menu3, 1);
    
    label = Label::createWithTTF("yellow triangle", "fonts/arial.ttf", 32);
    addChild(label, 1);
    label->setPosition(Vec2(s.width / 2 - 150, s.height - 130));
    
    auto decrease4 = MenuItemFont::create(" - ", CC_CALLBACK_1(PhysicsContactTest::onDecrease, this));
    decrease4->setColor(Color3B(0, 200, 20));
    auto increase4 = MenuItemFont::create(" + ", CC_CALLBACK_1(PhysicsContactTest::onIncrease, this));
    increase4->setColor(Color3B(0, 200, 20));
    decrease4->setTag(4);
    increase4->setTag(4);
    
    auto menu4 = Menu::create(decrease4, increase4, nullptr);
    menu4->alignItemsHorizontally();
    menu4->setPosition(Vec2(s.width / 2, s.height - 170));
    addChild(menu4, 1);
    
    label = Label::createWithTTF("blue triangle", "fonts/arial.ttf", 32);
    addChild(label, 1);
    label->setPosition(Vec2(s.width / 2 - 150, s.height - 170));
    
    resetTest();
}

void PhysicsContactTest::onDecrease(Ref* sender)
{
    switch (dynamic_cast<Node*>(sender)->getTag())
    {
        case 1:
            if (_yellowBoxNum > 0) _yellowBoxNum -= 50;
            break;
        case 2:
            if (_blueBoxNum > 0) _blueBoxNum -= 50;
            break;
        case 3:
            if (_yellowTriangleNum > 0) _yellowTriangleNum -= 50;
            break;
        case 4:
            if (_blueTriangleNum > 0) _blueTriangleNum -= 50;
            break;
            
        default:
            break;
    }
    
    resetTest();
}

void PhysicsContactTest::onIncrease(Ref* sender)
{
    switch (dynamic_cast<Node*>(sender)->getTag())
    {
        case 1:
            _yellowBoxNum += 50;
            break;
        case 2:
            _blueBoxNum += 50;
            break;
        case 3:
            _yellowTriangleNum += 50;
            break;
        case 4:
            _blueTriangleNum += 50;
            break;
            
        default:
            break;
    }
    
    resetTest();
}

void PhysicsContactTest::resetTest()
{
    removeChildByTag(10);
    auto root = Node::create();
    root->setTag(10);
    this->addChild(root);
    
    auto s = VisibleRect::getVisibleRect().size;
    std::string strNum;
    char buffer[10];
    
    sprintf(buffer, "%d", _yellowBoxNum);
    auto label = Label::createWithTTF(buffer, "fonts/arial.ttf", 32);
    root->addChild(label, 1);
    label->setPosition(Vec2(s.width / 2, s.height - 50));
    
    sprintf(buffer, "%d", _blueBoxNum);
    label = Label::createWithTTF(buffer, "fonts/arial.ttf", 32);
    root->addChild(label, 1);
    label->setPosition(Vec2(s.width / 2, s.height - 90));
    
    sprintf(buffer, "%d", _yellowTriangleNum);
    label = Label::createWithTTF(buffer, "fonts/arial.ttf", 32);
    root->addChild(label, 1);
    label->setPosition(Vec2(s.width / 2, s.height - 130));
    
    sprintf(buffer, "%d", _blueTriangleNum);
    label = Label::createWithTTF(buffer, "fonts/arial.ttf", 32);
    root->addChild(label, 1);
    label->setPosition(Vec2(s.width / 2, s.height - 170));
    
    auto wall = Node::create();
    wall->addComponent(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size, PhysicsMaterial(0.1f, 1, 0.0f)));
    wall->setPosition(VisibleRect::center());
    root->addChild(wall);
    
    auto contactListener = EventListenerPhysicsContact::create();
    contactListener->onContactBegin = CC_CALLBACK_1(PhysicsContactTest::onContactBegin, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(contactListener, this);
    
    // yellow box, will collide with itself and blue box.
    for (int i = 0; i < _yellowBoxNum; ++i)
    {
        Size size(10 + CCRANDOM_0_1() * 10, 10 + CCRANDOM_0_1() * 10);
        Size winSize = VisibleRect::getVisibleRect().size;
        Vec2 position = Vec2(winSize.width, winSize.height) - Vec2(size.width, size.height);
        position.x = position.x * CCRANDOM_0_1();
        position.y = position.y * CCRANDOM_0_1();
        position = VisibleRect::leftBottom() + position + Vec2(size.width / 2, size.height / 2);
        Vec2 velocity((CCRANDOM_0_1() - 0.5) * 200, (CCRANDOM_0_1() - 0.5) * 200);
        auto box = makeBox(position, size, 1, PhysicsMaterial(0.1f, 1, 0.0f));
        auto boxBody = box->getPhysicsBody();
        boxBody->setVelocity(velocity);
        boxBody->setCategoryBitmask(0x01);    // 0001
        boxBody->setContactTestBitmask(0x04); // 0100
        boxBody->setCollisionBitmask(0x03);   // 0011
        root->addChild(box);
    }
    
    // blue box, will collide with blue box.
    for (int i = 0; i < _blueBoxNum; ++i)
    {
        Size size(10 + CCRANDOM_0_1() * 10, 10 + CCRANDOM_0_1() * 10);
        Size winSize = VisibleRect::getVisibleRect().size;
        Vec2 position = Vec2(winSize.width, winSize.height) - Vec2(size.width, size.height);
        position.x = position.x * CCRANDOM_0_1();
        position.y = position.y * CCRANDOM_0_1();
        position = VisibleRect::leftBottom() + position + Vec2(size.width / 2, size.height / 2);
        Vec2 velocity((CCRANDOM_0_1() - 0.5) * 200, (CCRANDOM_0_1() - 0.5) * 200);
        auto box = makeBox(position, size, 2, PhysicsMaterial(0.1f, 1, 0.0f));
        auto boxBody = box->getPhysicsBody();
        boxBody->setVelocity(velocity);
        boxBody->setCategoryBitmask(0x02);    // 0010
        boxBody->setContactTestBitmask(0x08); // 1000
        boxBody->setCollisionBitmask(0x01);   // 0001
        root->addChild(box);
    }
    
    // yellow triangle, will collide with itself and blue box.
    for (int i = 0; i < _yellowTriangleNum; ++i)
    {
        Size size(10 + CCRANDOM_0_1() * 10, 10 + CCRANDOM_0_1() * 10);
        Size winSize = VisibleRect::getVisibleRect().size;
        Vec2 position = Vec2(winSize.width, winSize.height) - Vec2(size.width, size.height);
        position.x = position.x * CCRANDOM_0_1();
        position.y = position.y * CCRANDOM_0_1();
        position = VisibleRect::leftBottom() + position + Vec2(size.width / 2, size.height / 2);
        Vec2 velocity((CCRANDOM_0_1() - 0.5) * 300, (CCRANDOM_0_1() - 0.5) * 300);
        auto triangle = makeTriangle(position, size, 1, PhysicsMaterial(0.1f, 1, 0.0f));
        auto triangleBody = triangle->getPhysicsBody();
        triangleBody->setVelocity(velocity);
        triangleBody->setCategoryBitmask(0x04);    // 0100
        triangleBody->setContactTestBitmask(0x01); // 0001
        triangleBody->setCollisionBitmask(0x06);   // 0110
        root->addChild(triangle);
    }
    
    // blue triangle, will collide with yellow box.
    for (int i = 0; i < _blueTriangleNum; ++i)
    {
        Size size(10 + CCRANDOM_0_1() * 10, 10 + CCRANDOM_0_1() * 10);
        Size winSize = VisibleRect::getVisibleRect().size;
        Vec2 position = Vec2(winSize.width, winSize.height) - Vec2(size.width, size.height);
        position.x = position.x * CCRANDOM_0_1();
        position.y = position.y * CCRANDOM_0_1();
        position = VisibleRect::leftBottom() + position + Vec2(size.width / 2, size.height / 2);
        Vec2 velocity((CCRANDOM_0_1() - 0.5) * 300, (CCRANDOM_0_1() - 0.5) * 300);
        auto triangle = makeTriangle(position, size, 2, PhysicsMaterial(0.1f, 1, 0.0f));
        auto triangleBody = triangle->getPhysicsBody();
        triangleBody->setVelocity(velocity);
        triangleBody->setCategoryBitmask(0x08);    // 1000
        triangleBody->setContactTestBitmask(0x02); // 0010
        triangleBody->setCollisionBitmask(0x01);   // 0001
        root->addChild(triangle);
    }
}

bool PhysicsContactTest::onContactBegin(PhysicsContact& contact)
{
    PhysicsBody* a = contact.getShapeA()->getBody();
    PhysicsBody* b = contact.getShapeB()->getBody();
    PhysicsBody* body = (a->getCategoryBitmask() == 0x04 || a->getCategoryBitmask() == 0x08) ? a : b;
    CC_ASSERT(body->getCategoryBitmask() == 0x04 || body->getCategoryBitmask() == 0x08);
    
    return true;
}

std::string PhysicsContactTest::title() const
{
    return "Contact Test";
}

std::string PhysicsContactTest::subtitle() const
{
    return "should not crash";
}

void PhysicsPositionRotationTest::onEnter()
{
    PhysicsDemo::onEnter();
    toggleDebug();
    _physicsWorld->setGravity(Point::ZERO);
    
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = CC_CALLBACK_2(PhysicsDemo::onTouchBegan, this);
    touchListener->onTouchMoved = CC_CALLBACK_2(PhysicsDemo::onTouchMoved, this);
    touchListener->onTouchEnded = CC_CALLBACK_2(PhysicsDemo::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    auto wall = Node::create();
    wall->addComponent(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size));
    wall->setPosition(VisibleRect::center());
    addChild(wall);
    
    // anchor test
    auto anchorNode = Sprite::create("Images/YellowSquare.png");
    //anchorNode->setAnchorPoint(Vec2(0.1f, 0.9f));
    anchorNode->setPosition(100, 100);
    anchorNode->setScale(0.25);
    anchorNode->addComponent(PhysicsBody::createBox(anchorNode->getContentSize()));
    anchorNode->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    addChild(anchorNode);
    
    //parent test
    auto parent = Sprite::create("Images/YellowSquare.png");
    parent->setPosition(200, 100);
    parent->setScale(0.25);
    parent->addComponent(PhysicsBody::createBox(parent->getContentSize()));
    parent->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    addChild(parent);
    
    auto leftBall = Sprite::create("Images/ball.png");
    leftBall->setPosition(-30, 0);
    leftBall->Node::setScale(2);
    leftBall->addComponent(PhysicsBody::createCircle(leftBall->getContentSize().width/2));
    leftBall->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    parent->addChild(leftBall);
    
    // offset position rotation test
    auto offsetPosNode = Sprite::create("Images/YellowSquare.png");
    offsetPosNode->setPosition(100, 200);
    auto body = PhysicsBody::createBox(offsetPosNode->getContentSize() / 2);
    offsetPosNode->addComponent(body);
    body->setPositionOffset(-Vec2(offsetPosNode->getContentSize() / 2));
    body->setRotationOffset(45);
    body->setTag(DRAG_BODYS_TAG);
    addChild(offsetPosNode);
    
    return;
}

std::string PhysicsPositionRotationTest::title() const
{
    return "Position/Rotation Test";
}

void PhysicsSetGravityEnableTest::onEnter()
{
    PhysicsDemo::onEnter();
    
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = CC_CALLBACK_2(PhysicsDemo::onTouchBegan, this);
    touchListener->onTouchMoved = CC_CALLBACK_2(PhysicsDemo::onTouchMoved, this);
    touchListener->onTouchEnded = CC_CALLBACK_2(PhysicsDemo::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    // wall
    auto wall = Node::create();
    wall->addComponent(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size, PhysicsMaterial(0.1f, 1.0f, 0.0f)));
    wall->setPosition(VisibleRect::center());
    addChild(wall);
    
    // common box
    auto commonBox = makeBox(Vec2(100, 100), Size(50, 50), 1);
    commonBox->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    addChild(commonBox);
    
    auto box = makeBox(Vec2(200, 100), Size(50, 50), 2);
    auto boxBody = box->getPhysicsBody();
    boxBody->setMass(20);
    boxBody->setTag(DRAG_BODYS_TAG);
    boxBody->setGravityEnable(false);
    addChild(box);
    
    auto ball = makeBall(Vec2(200, 200), 50);
    ball->setTag(2);
    auto ballBody = ball->getPhysicsBody();
    ballBody->setTag(DRAG_BODYS_TAG);
    ballBody->setGravityEnable(false);
    ballBody->setMass(50);
    addChild(ball);
    
    scheduleOnce(CC_SCHEDULE_SELECTOR(PhysicsSetGravityEnableTest::onScheduleOnce), 1.0);
}

void PhysicsSetGravityEnableTest::onScheduleOnce(float /*delta*/)
{
    auto ball = getChildByTag(2);
    ball->getPhysicsBody()->setMass(200);
    
    _physicsWorld->setGravity(Vec2(0, 98));
}

std::string PhysicsSetGravityEnableTest::title() const
{
    return "Set Gravity Enable Test";
}

std::string PhysicsSetGravityEnableTest::subtitle() const
{
    return "only yellow box drop down";
}

void PhysicsDemoBug5482::onEnter()
{
    PhysicsDemo::onEnter();
    
    toggleDebug();
    
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = CC_CALLBACK_2(PhysicsDemo::onTouchBegan, this);
    touchListener->onTouchMoved = CC_CALLBACK_2(PhysicsDemo::onTouchMoved, this);
    touchListener->onTouchEnded = CC_CALLBACK_2(PhysicsDemo::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    _bodyInA = false;
    
    // wall
    auto wall = Node::create();
    wall->addComponent(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size, PhysicsMaterial(0.1f, 1.0f, 0.0f)));
    wall->setPosition(VisibleRect::center());
    addChild(wall);
    
    //button
    MenuItemFont::setFontSize(18);
    _button = MenuItemFont::create("Set Body To A", CC_CALLBACK_1(PhysicsDemoBug5482::changeBodyCallback, this));
    
    auto menu = Menu::create(_button, nullptr);
    this->addChild(menu);
    
    _nodeA = Sprite::create("Images/YellowSquare.png");
    _nodeA->setPosition(VisibleRect::center().x - 150, 100);
    this->addChild(_nodeA);
    
    _nodeB = Sprite::create("Images/YellowSquare.png");
    _nodeB->setPosition(VisibleRect::center().x + 150, 100);
    this->addChild(_nodeB);
    
    _body = PhysicsBody::createBox(_nodeA->getContentSize());
    _body->setTag(DRAG_BODYS_TAG);
    _body->retain();
}

void PhysicsDemoBug5482::onExit()
{
    PhysicsDemo::onExit();
    _body->release();
}

void PhysicsDemoBug5482::changeBodyCallback(Ref* /*sender*/)
{
    Sprite* node = _bodyInA ? _nodeB : _nodeA;
    if (_bodyInA)
    {
        _button->setString("Set Body To A");
    }
    else
    {
        _button->setString("Set Body To B");
    }

    if (_body->getOwner())
    {
        _body->getOwner()->removeComponent(_body);
    }
    node->addComponent(_body);
    _bodyInA = !_bodyInA;
}

std::string PhysicsDemoBug5482::title() const
{
    return "bug 5482: setPhysicsBodyTest";
}

std::string PhysicsDemoBug5482::subtitle() const
{
    return "change physics body to the other.";
}

void PhysicsFixedUpdate::onEnter()
{
    PhysicsDemo::onEnter();
    
    toggleDebug();
    _physicsWorld->setGravity(Point::ZERO);
    
    // wall
    auto wall = Node::create();
    wall->addComponent(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size, PhysicsMaterial(0.1f, 1, 0.0f)));
    wall->setPosition(VisibleRect::center());
    this->addChild(wall);
    
    addBall();
    
    scheduleOnce(CC_SCHEDULE_SELECTOR(PhysicsFixedUpdate::updateStart), 2);
}

void PhysicsFixedUpdate::addBall()
{
    auto ball = Sprite::create("Images/ball.png");
    ball->setPosition(100, 100);
    auto ballBody = PhysicsBody::createCircle(ball->getContentSize().width / 2, PhysicsMaterial(0.1f, 1, 0.0f));
    ball->addComponent(ballBody);
    ballBody->setTag(DRAG_BODYS_TAG);
    ballBody->setVelocity(Point(1000, 20));
    this->addChild(ball);
}

void PhysicsFixedUpdate::updateStart(float /*delta*/)
{
    addBall();
    
    _physicsWorld->setFixedUpdateRate(180);
}

void PhysicsFixedUpdate::update(float /*delta*/)
{
    
    // use fixed time and calculate 3 times per frame makes physics simulate more precisely.
    for (int i = 0; i < 3; ++i)
    {
        _physicsWorld->step(1/180.0f);
    }
}

std::string PhysicsFixedUpdate::title() const
{
    return "Fixed Update Test";
}

std::string PhysicsFixedUpdate::subtitle() const
{
    return "The second ball should not run across the wall";
}

bool PhysicsTransformTest::onTouchBegan(Touch *touch, Event* /*event*/)
{
    _parentSprite->setPosition(_rootLayer->convertTouchToNodeSpace(touch));
    return false;
}

void PhysicsTransformTest::onEnter()
{
    PhysicsDemo::onEnter();
    toggleDebug();
    _physicsWorld->setGravity(Point::ZERO);
    
    auto touchListener = EventListenerTouchOneByOne::create();
    touchListener->onTouchBegan = CC_CALLBACK_2(PhysicsTransformTest::onTouchBegan, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener, this);
    
    _rootLayer = Layer::create();
    addChild(_rootLayer);
    
    auto wall = Node::create();
    wall->addComponent(PhysicsBody::createEdgeBox(VisibleRect::getVisibleRect().size, PhysicsMaterial(0.1f, 1.0f, 0.0f)));
    wall->setPosition(VisibleRect::center());
    _rootLayer->addChild(wall);
    
    //parent test
    _parentSprite = Sprite::create("Images/YellowSquare.png");
    _parentSprite->setPosition(200, 100);
    _parentSprite->setScale(0.25);
    _parentSprite->addComponent(PhysicsBody::createBox(_parentSprite->getContentSize(), PhysicsMaterial(0.1f, 1.0f, 0.0f)));
    _parentSprite->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    _parentSprite->setTag(1);
    _rootLayer->addChild(_parentSprite);
    
    auto leftBall = Sprite::create("Images/ball.png");
    leftBall->setPosition(-30, 0);
    leftBall->setScale(2);
    leftBall->addComponent(PhysicsBody::createCircle(leftBall->getContentSize().width/2, PhysicsMaterial(0.1f, 1.0f, 0.0f)));
    leftBall->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    _parentSprite->addChild(leftBall);
    
    ScaleTo* scaleTo = ScaleTo::create(2.0, 0.5);
    ScaleTo* scaleBack = ScaleTo::create(2.0, 1.0);
    _parentSprite->runAction(RepeatForever::create(Sequence::create(scaleTo, scaleBack, nullptr)));
    
    auto normal = Sprite::create("Images/YellowSquare.png");
    normal->setPosition(300, 100);
    normal->setScale(0.25, 0.5);
    normal->addComponent(PhysicsBody::createBox(normal->getContentSize(), PhysicsMaterial(0.1f, 1.0f, 0.0f)));
    normal->getPhysicsBody()->setTag(DRAG_BODYS_TAG);
    _rootLayer->addChild(normal);
    
    auto bullet = Sprite::create("Images/ball.png");
    bullet->setPosition(200, 200);
    bullet->addComponent(PhysicsBody::createCircle(bullet->getContentSize().width/2, PhysicsMaterial(0.1f, 1.0f, 0.0f)));
    bullet->getPhysicsBody()->setVelocity(Vec2(100, 100));
    _rootLayer->addChild(bullet);
    
    MoveBy* move = MoveBy::create(2.0f, Vec2(100, 100));
    MoveBy* move2 = MoveBy::create(2.0f, Vec2(-200, 0));
    MoveBy* move3 = MoveBy::create(2.0f, Vec2(100, -100));
    ScaleTo* scale = ScaleTo::create(3.0f, 0.3f);
    ScaleTo* scale2 = ScaleTo::create(3.0f, 1.0f);
    
    RotateBy* rotate = RotateBy::create(6.0f, 360);
    
    _rootLayer->runAction(RepeatForever::create(Sequence::create(move, move2, move3, nullptr)));
    _rootLayer->runAction(RepeatForever::create(Sequence::create(scale, scale2, nullptr)));
    _rootLayer->runAction(RepeatForever::create(rotate));
}

std::string PhysicsTransformTest::title() const
{
    return "Physics transform test";
}

void PhysicsIssue9959::onEnter()
{
    PhysicsDemo::onEnter();
    
    auto origin = Director::getInstance()->getVisibleOrigin();
    auto visibleSize = Director::getInstance()->getVisibleSize();
    
    auto scale9Sprite1 = ui::Scale9Sprite::create("Images/ball.png");
    scale9Sprite1->setPosition(origin + visibleSize/2);
    addChild(scale9Sprite1);
    scale9Sprite1->runAction(RepeatForever::create(Sequence::create(MoveBy::create(2.0f, Vec2(100.0f,0.0f)), MoveBy::create(2.0f, Vec2(-100.0f, 0.0f)), NULL)));
    
    auto scale9Sprite2 = ui::Scale9Sprite::create("Images/ball.png");
    scale9Sprite2->setPosition(origin + visibleSize/2 + Vec2(0.0f, 50.0f));
    addChild(scale9Sprite2);
    scale9Sprite2->runAction(RepeatForever::create(Sequence::create(ScaleTo::create(2.0f, 1.5f), ScaleTo::create(2.0f, 1.0f), NULL)));
    
    auto scale9Sprite3 = ui::Scale9Sprite::create("Images/ball.png");
    scale9Sprite3->setPosition(origin + visibleSize/2 + Vec2(0.0f, -50.0f));
    addChild(scale9Sprite3);
    scale9Sprite3->runAction(RepeatForever::create(RotateBy::create(2.0f, 360.0f)));
}

std::string PhysicsIssue9959::title() const
{
    return "Reorder issue #9959";
}

std::string PhysicsIssue9959::subtitle() const
{
    return "Test Scale9Sprite run scale/move/rotation action in physics scene";
}

//
void PhysicsIssue15932::onEnter()
{
    PhysicsDemo::onEnter();

    PhysicsBody *pb=PhysicsBody::createBox(Size(15,5),PhysicsMaterial(0.1f,0.0f,1.0f));
    this->addComponent(pb);
    this->removeComponent(pb);
}

std::string PhysicsIssue15932::title() const
{
    return "Github issue #15932";
}

std::string PhysicsIssue15932::subtitle() const
{
    return "addComponent()/removeComponent() should not crash";
}

#endif