Cocos2d、Box2D 静止直到输入

发布于 2025-01-02 06:14:21 字数 731 浏览 0 评论 0原文

大家好，我有一个问题，如何创建一个在按下它之前不会具有物理功能的身体？我的 init 中有这段代码

CCSprite *tail = [CCSprite spriteWithFile:@"Ball.jpg"];
[self addChild:tail z:1];

b2BodyDef tailBodyDef;
tailBodyDef.type = b2_dynamicBody;
tailBodyDef.position.Set(100/PTM_RATIO, 100/PTM_RATIO);
tailBodyDef.userData = tail;
tailBody = world->CreateBody(&tailBodyDef);

b2CircleShape circle;
circle.m_radius = 26.0/PTM_RATIO;

b2FixtureDef tailShapeDef;
tailShapeDef.shape = &circle;
tailShapeDef.density = 1.0f;
tailShapeDef.friction = 0.2f;
tailShapeDef.restitution = 0.8f;
tailBody->CreateFixture(&tailShapeDef);

[self schedule: @selector(tick:)];

球会在游戏开始时从屏幕边缘掉落，但这不是我想要的。我希望它保持在同一位置，直到我按下它。无论如何，我可以保留该对象，直到我给出一些输入吗？

原文

Hey guys i have a question here, How do i create a body that will not have physic function until i press it? i have this code in my init

CCSprite *tail = [CCSprite spriteWithFile:@"Ball.jpg"];
[self addChild:tail z:1];

b2BodyDef tailBodyDef;
tailBodyDef.type = b2_dynamicBody;
tailBodyDef.position.Set(100/PTM_RATIO, 100/PTM_RATIO);
tailBodyDef.userData = tail;
tailBody = world->CreateBody(&tailBodyDef);

b2CircleShape circle;
circle.m_radius = 26.0/PTM_RATIO;

b2FixtureDef tailShapeDef;
tailShapeDef.shape = &circle;
tailShapeDef.density = 1.0f;
tailShapeDef.friction = 0.2f;
tailShapeDef.restitution = 0.8f;
tailBody->CreateFixture(&tailShapeDef);

[self schedule: @selector(tick:)];

The ball will drop off the the edge of screen at the start of game, but thats not what i want. i want it to stay at the same position until i press it. is there anyway i could hold the object back until i give some input?

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