我最近开始使用Cocos2d和Box2d在iPhone上进行游戏编程。因此,这里是我的问题:为什么我的精灵不与b2Body对齐?
我得从CCSprite继承了Player类,而这个类中,有以下方法:
-(void) createBox2dObject:(Player *)sender
forWorld:(b2World*)world {
b2BodyDef playerBodyDef;
playerBodyDef.type = b2_dynamicBody;
playerBodyDef.position.Set(sender.position.x/PTM_RATIO, sender.position.y/PTM_RATIO);
playerBodyDef.userData = sender;
body = world->CreateBody(&playerBodyDef);
b2PolygonShape dynamicBox;
dynamicBox.SetAsBox(sender.contentSize.width/PTM_RATIO,
sender.contentSize.height/PTM_RATIO);
b2FixtureDef polygonShapeDef;
polygonShapeDef.shape = &dynamicBox;
polygonShapeDef.density = 1.0f;
polygonShapeDef.friction = 1.0f;
polygonShapeDef.restitution = 0;
body->CreateFixture(&polygonShapeDef);
}
这里就是我称之为:
self.player = [Player spriteWithSpriteFrameName:@"runningrupol-1.png"];
_player.position = ccp(_player.boundingBox.size.width/2 + 32, _player.boundingBox.size.height/2 + 32);
self.walkAction = [CCRepeatForever actionWithAction:
[CCAnimate actionWithAnimation:walkAnim restoreOriginalFrame:NO]];
[_player runAction:_walkAction];
[spriteSheet addChild:_player];
[_player createBox2dObject:_player forWorld:_world];
显然,我正在使用动画的spritesheet。
以下是我更新的世界:
- (void)tick:(ccTime) dt {
_world->Step(dt, 8, 10);
for(b2Body *b = _world->GetBodyList(); b; b=b->GetNext()) {
if (b->GetUserData() != NULL) {
CCSprite *playerData = (CCSprite *)b->GetUserData();
playerData.position = ccp(b->GetPosition().x * PTM_RATIO,
b->GetPosition().y * PTM_RATIO);
playerData.rotation = -1 * CC_RADIANS_TO_DEGREES(b->GetAngle());
}
}
}
这里就是我如何把它在init方法:
[self schedule:@selector(tick:)];
这是我所看到的:
请帮忙。如果您需要更多信息,请告诉我。
做完这些之后,当力量作用于身体时,精灵的移动速度比身体快。 – Sam 2012-02-04 09:55:39
你可以发布你的代码如何根据物理对象更新你的精灵。 – 2012-02-04 14:04:01
我更新了问题。 – Sam 2012-02-04 15:07:19