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我想创造像过山车这样的游戏并尝试为它制作火车..

我试过用 boxbody 创建火车

火车代码：

-(void)addTrainAtPos:(CGPoint)pos:(int)n:(CCLayer *)Layer
{
    b2BodyDef BodyDef;
    BodyDef.type = b2_dynamicBody;

    b2PolygonShape box;
    b2FixtureDef fixtureDef;

    fixtureDef.density = 0.5f;
    fixtureDef.friction = 0.0f;
    fixtureDef.restitution = 0.0f;

    box.SetAsBox(ptm(15), ptm(10));
    fixtureDef.shape = &box;

    b2Body *Body;
    b2Body *LastBody;

    b2DistanceJointDef Djoint;

    BodyDef.position.Set(ptm(pos.x - (0 * (30 + Spacing))), ptm(pos.y));
    BodyDef.fixedRotation = true;
    Body = world->CreateBody(&BodyDef);
    Body->CreateFixture(&fixtureDef);

    LastBody = Body;

    for (int i=1; i<n; i++) 
    {
        BodyDef.position.Set(ptm(pos.x - (i * (30 + Spacing))), ptm(pos.y));
        BodyDef.fixedRotation = true;
        Body = world->CreateBody(&BodyDef);
        Body->CreateFixture(&fixtureDef);

        //Djoint.Initialize(LastBody, Body, LastBody->GetWorldCenter(), Body->GetWorldCenter());
        //world->CreateJoint(&Djoint);
        //LastBody = Body;

    }

}

我还尝试在火车之间创建关节并尝试使用 continue LinearVelocity 移动它

-(void)MoveTrain
{
    for(NSValue *Val in Bodies)
    {
        b2Body *Body = (b2Body *)[Val pointerValue];
        b2Vec2 old = Body->GetLinearVelocity();
        if(old.x < 20)
            Body->SetLinearVelocity(b2Vec2(Speed, old.y));
    }
}

但我的问题是，当我跳火车时，我对第一个引擎施力，但我的整个火车跳得并不完美，而不是我试图对整个火车一个接一个地施力，所有转向架都有一些延迟，但我也没有变得完美，所以请给我任何相关代码来创建火车和移动并完美地跳跃它..

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