Question

目前，在cocos2d中，我有一个应用程序执行以下操作：

使用空白屏幕启动。当我点击屏幕时，我会弹出一个圆圈。当我按住圆圈时，圆圈将继续以恒定的速度增长。然而，尽管精灵正在增长，但box2d物理体却没有，这意味着精灵不会与其他身体发生碰撞。我一直试图找出一种方法来改变与精灵一起缩放的半径，但这里没有针对cocos2d的问题。我注意到除了cocos2d之外的其他东西的其他box2d但是我很难将它们翻译过来。

//smile.position = ccp(touchLocation.x, touchLocation.y);
smile.scale = .05;
[self addChild:smile];


// b2BodyDef smileBodyDef;

smileBodyDef.type = b2_dynamicBody;
smileBodyDef.position.Set(touchLocation.x/PTM_RATIO, touchLocation.y/PTM_RATIO);
smileBodyDef.userData = smile;
smileBody = world->CreateBody(&smileBodyDef);
//Radius
b2CircleShape smileCircleShape;
int radius = 80;

//Fixture
smileFixtureDef.shape = &smileCircleShape;
smileFixtureDef.density = 0.00f;
smileFixtureDef.friction = .2f;
smileBody->CreateFixture(&smileFixtureDef);




if (CGRectContainsPoint(smileRect, touchLocation)) {
growForever = [CCRepeatForever actionWithAction: [CCScaleBy actionWithDuration: .5 scale:    1.2]];
[growForever setTag:1];
[smile runAction:growForever];

Answer 1

每次想要改变半径时，抓住与为身体创建的b2Fixture相关联的形状对象，然后相应地设置新值：

fixture->GetShape()->m_radius = new_radius/PTM_RATIO;

Cocos2d Box2d缩放半径圆体

1 个答案: