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我正在使用cocos2d-x中的box2d創建類似彈跳球的遊戲。我創建了一個動態的物體對象,我希望它在觸摸開始時移動。我正在使用下面的代碼來移動動態主體,但它不移動。請任何人都可以幫我解決問題。當touchbegin移動box2d中的動態body對象
bullet2=CCSprite::create("block.png");
bullet2->setPosition(ccp(2740, 1220));
this->addChild(bullet2,0);
ballBodyDefB.type=b2_dynamicBody;
ballBodyDefB.position.Set(2740/PTM_RATIO, 1170/PTM_RATIO);
ballBodyDefB.userData=bullet2;
ballBodyDefB.gravityScale=0;
_bullet=_world->CreateBody(&ballBodyDefB);
b2PolygonShape bulletshape;
bulletshape.SetAsBox(bullet2->getContentSize().width/PTM_RATIO/2,
bullet2->getContentSize().height/PTM_RATIO/2);
b2FixtureDef b_bullet ;
b_bullet.shape = &bulletshape;
b_bullet.density = 1.0f;
b_bullet.friction = 0.1f;
b_bullet.restitution = 0.0;
_bullet->CreateFixture(&b_bullet);
CCTouchbegan:
b2Vec2 force = b2Vec2(0, -450);
_block->ApplyLinearImpulse(force, _block->GetPosition());