如何在 cocos2d-x 3.3 中进行实体的物理连接？

Question

如何在 cocos2d-x 3.3 中将这两个（汽车和车轮）结合为一个物理体？ 如何将此关节体添加到物理世界中？

Sprite *car=Sprite::create("abc.png");
car->setPosition(100,400);
car->setScale(1.5, 1.5);
this->addChild(car);
PhysicsBody *car_body=PhysicsBody::create();
car->setPhysicsBody(car_body);
car_body->setGravityEnable(false);

Sprite *wheel=Sprite::create("abc.png");
wheel->setPosition(40,350);
this->addChild(wheel);

PhysicsBody *wheel_bd=PhysicsBody::create(); 
wheel_bd=PhysicsBody::createCircle(69.0/64.0);
wheel->setPhysicsBody(wheel_bd);
wheel_bd->setGravityEnable(false);
PhysicsJoint *co =PhysicsJointGroove::construct(wheel->getPhysicsBody(),
car->getPhysicsBody(),Vec2(80,250),Vec2(160,250),Vec2(1.0,1.0));
scene->getPhysicsWorld()->addJoint(co); //this line creating error into my code.

Answer 1

我怀疑这个错误是由于你的 car_body 没有任何形状，尝试为你的 car_body 添加一个形状，做这样的事情 编辑：-

        Sprite *car=Sprite::create("abc.png");
        car->setPosition(100,400);
        car->setScale(1.5, 1.5);

        PhysicsBody *car_Body = PhysicsBody::create();
        car_Body->addShape(PhysicsShapeBox::create(car->getBoundingBox().size);
        car_Body->setGravityEnable(false);
        car->setPhysicsBody(car_body);
        this->addChild(car);

在上面的代码中，您的汽车物理车身将有一个您的 Sprite 的边界框 你也有点浪费在这里：-

         PhysicsBody *wheel_bd = PhysicsBody::create(); 
         wheel_bd=PhysicsBody::createCircle(69.0/64.0);

你应该这样做：-

         PhysicsBody *wheel_bd = PhysicsBody::create();
         wheel_bd ->addShape(PhysicsShapeCircle::create(69.0/64.0));