Question

以下是代码：

ball = [CCSprite spriteWithFile:@"Ball.png" rect:CGRectMake(0, 0, 52, 52)];
        ball.position = ccp(300, 300);
        ball.tag = 1;
        [self addChild:ball z:-1];

        // Create ball body 
        //b2BodyDef ballBodyDef;
        ballBodyDef.type = b2_dynamicBody;
        ballBodyDef.position.Set(100/PTM_RATIO, 300/PTM_RATIO);
        ballBodyDef.userData = ball;
        b2Body * ballBody = _world->CreateBody(&ballBodyDef);

        // Create circle shape
        b2CircleShape circle;
        circle.m_radius = 20.0/PTM_RATIO;

        // Create shape definition and add to body
        b2FixtureDef ballShapeDef;
        ballShapeDef.shape = &circle;
        ballShapeDef.density = -2.5f;
        ballShapeDef.friction = 0.01f;
        ballShapeDef.restitution = 1.0f;
        _ballFixture = ballBody->CreateFixture(&ballShapeDef);

        b2Vec2 force = b2Vec2(5, 7);
        ballBody->ApplyLinearImpulse(force, ballBodyDef.position);

我想旋转，动画和移动球，但我很困惑，如何同时应用所有的东西！？

Answer 1

例如，如何将box2d位置和旋转应用于CCNode，

// Position
b2Vec2 b2pos = ballBody->GetPosition();
CGPoint position = ccpMult(CGPointMake(b2pos.x, b2pos.y), PTM_RATIO);
ball.position = position;

// Rotation
float angle = ballBody->GetAngle();
ball.rotation = -(CC_RADIANS_TO_DEGREES(angle));

顺便说一句，CCBox2D对cocos2d和Box2d很有帮助。

Answer 2

使用Spawn动作同时播放多个动作。 id spawAction = [CCSpawn actions：moveAction，rotateAction，nil]; [aSprite runAction：spawAction];

我想同时移动，动画和旋转对象

2 个答案: