box2d加速度计如何使其工作

Question

I'm trying to make the box2d accelerometer work, I have a car sprite and want it to move left and right, when the iPhone is tilted.

Here is the code for the sprite:

- (void)spawnCar {

car = [CCSprite spriteWithSpriteFrameName:@"car.jpg"];
car.position = ccp(160, 250);
car.tag = 2;

[self addBoxBodyForSprite:car];

[_spriteSheet addChild:car];

}

How can implement the accelerometer to work for left and right?

Answer 1

Just do this...

in your init add

self.isAccelerometerEnabled = YES;

and then add this method...

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
    b2Vec2 gravity(-acceleration.y * 15, acceleration.x *15);
    world->SetGravity(gravity);

}