Scene* GameScene::createScene()
{
    //物理演算を使う為にcreateWithPhysicsを使用
    auto scene = Scene::createWithPhysics();
 
    //Worldに対して重力をセット
    Vect gravity;
    gravity.setPoint(0, -50);
    scene->getPhysicsWorld()->setGravity(gravity);
    scene->getPhysicsWorld()->setSpeed(6.0f);
 
    //物理オブジェクトにを可視的にしてくれるデバックモード
    scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);
 
    auto layer = GameScene::create();
    scene->addChild(layer);
 
    return scene;
}

// on "init" you need to initialize your instance
bool GameScene::init()
{
    //初期化
    if ( !Layer::init() ) return false;
 
    //画面サイズサイズを取得
    auto window_size = Director::getInstance()->getWinSize();
 
    //床
    auto wall = Sprite::create();
    wall->setPosition(150, 0);
    wall->setTextureRect(Rect(0,0,1000,100));
    wall->setColor(Color3B(255,255,255));
    wall->setRotation(10.0f);
    //反発係数と摩擦係数
    auto material = PHYSICSBODY_MATERIAL_DEFAULT;
    material.restitution = 0.0f;
    material.friction = 0.0f;
 
    auto pWall = PhysicsBody::createBox(wall->getContentSize(), material);
    //重力干渉を受けるか
    pWall->setDynamic(false);
    //回転させるか
    pWall->setRotationEnable(false);
    wall->setPhysicsBody(pWall);
    addChild(wall);
 
    //丸いボール
    auto ball = Sprite::create();
    ball->setPosition(20, 300);
    ball->setColor(Color3B(255,255,255));
    auto pBall = PhysicsBody::createCircle(10.0f);
    pBall->setDynamic(true);
    pBall->setRotationEnable(true);
    ball->setPhysicsBody(pBall);
    addChild(ball);
 
    return true;
}