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在我正在尝试制作的游戏中，由于 box2d，我有一个弹跳的球精灵。这是我当前代码的外观：

-(id)init
{
    ball = [CCSprite spriteWithFile:@"ball.png"];
    ball.position = ccp(150, winSize.height * 0.78);
    [self addChild:ball];
    ball.tag = 2;

b2BodyDef ballBodyDef;
ballBodyDef.type = b2_dynamicBody;
ballBodyDef.position.Set(150/PTM_RATIO, 450/PTM_RATIO);
ballBodyDef.userData = ball;
_body = _world->CreateBody(&ballBodyDef);

b2CircleShape circle;
circle.m_radius = 26.0/PTM_RATIO;

b2FixtureDef ballShapeDef;
ballShapeDef.shape = &circle;
ballShapeDef.density = 0.5f;
ballShapeDef.friction = 1.0f;
ballShapeDef.restitution = 1.0f;
_ballFixture = _body->CreateFixture(&ballShapeDef);

b2Vec2 force = b2Vec2(160, 375);
_body->ApplyLinearImpulse(force, ballBodyDef.position);}

- (void)update:(ccTime) dt {
if(_isPaused == FALSE)
{
    _world->Step(dt, 10, 10);
    for(b2Body *b = _world->GetBodyList(); b; b=b->GetNext()) {
        if (b->GetUserData() != NULL) {
            CCSprite *sprite = (CCSprite *)b->GetUserData();
            if(sprite.tag == 2)
            {
                sprite.position = ccp(b->GetPosition().x * PTM_RATIO,
                              b->GetPosition().y * PTM_RATIO);
                sprite.rotation = -1 * CC_RADIANS_TO_DEGREES(b->GetAngle());
            }
        }
    }}

弹跳本身效果很好，我的问题是在某些情况下，球会在直线上弹跳，可以说是垂直或水平连续弹跳，我试图避免。所以我的问题是，我怎样才能让我的球精灵以一个角度而不是直线弹跳，这样它就不会被卡在同一个方向无限弹跳？

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1 回答 1

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您可以“随机”或以相等的间隔对身体或世界施加微小的力或重力变化。

于 2013-03-09T08:34:48.330 回答