I have noticed in my game that my b2Bodies are not the same size as my CCSprite s. This is the code I am using:

- (void)addBoxBodyForSprite:(CCSprite *)sprite {
    b2BodyDef spriteBodyDef;
    spriteBodyDef.type = b2_dynamicBody;
    spriteBodyDef.position.Set(sprite.position.x/CTM_RATIO, sprite.position.y/CTM_RATIO);
    spriteBodyDef.userData = sprite;
    b2Body *spriteBody = world->CreateBody(&spriteBodyDef);
    b2PolygonShape spriteShape;
    spriteShape.SetAsBox(sprite.contentSize.width/CTM_RATIO/2, sprite.contentSize.height/CTM_RATIO/2);
    b2FixtureDef spriteShapeDef;
    spriteShapeDef.shape = &spriteShape;
    spriteBody->CreateFixture(&spriteShapeDef);
}

我怎么会把这一守则推到仅仅无视CTM(PTM) 整体来看,也只是《共同标准》的确切规模? 我知道我本应使用PTM比率,但我的情况并非如此。

感谢!

www.un.org/Depts/DGACM/index_spanish.htm Edit1:

- (void)addBoxBodyForSprite:(CCSprite *)sprite {
    b2BodyDef spriteBodyDef;
    spriteBodyDef.type = b2_dynamicBody;
    spriteBodyDef.position.Set(sprite.position.x/(CC_CONTENT_SCALE_FACTOR() * CTM_RATIO), sprite.position.y/(CC_CONTENT_SCALE_FACTOR() * PTM_RATIO));
    spriteBodyDef.userData = sprite;
    b2Body *spriteBody = world->CreateBody(&spriteBodyDef);
    b2PolygonShape spriteShape;
    spriteShape.SetAsBox(sprite.boundingBox.size.width/(CC_CONTENT_SCALE_FACTOR() * PTM_RATIO)/2, sprite.boundingBox.size.height/(CC_CONTENT_SCALE_FACTOR() * PTM_RATIO)/2);
    b2FixtureDef spriteShapeDef;
    spriteShapeDef.shape = &spriteShape;
    spriteBody->CreateFixture(&spriteShapeDef);
}

www.un.org/Depts/DGACM/index_spanish.htm Edit2:

- (void)addBoxBodyForSprite:(CCSprite *)sprite {
    b2BodyDef spriteBodyDef;
    spriteBodyDef.type = b2_dynamicBody;
    spriteBodyDef.position.Set(sprite.position.x/CTM_RATIO, sprite.position.y/CTM_RATIO);
    spriteBodyDef.userData = sprite;
    b2Body *spriteBody = world->CreateBody(&spriteBodyDef);
    b2PolygonShape spriteShape;
    spriteShape.SetAsBox(sprite.boundingBox.size.width/CTM_RATIO, sprite.boundingBox.size.height/CTM_RATIO);
    b2FixtureDef spriteShapeDef;
    spriteShapeDef.shape = &spriteShape;
    spriteBody->CreateFixture(&spriteShapeDef);
}