加速及控制精灵移动，加速计值的处理

加速及控制精灵移动，加速计值的处理

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {    #define kFilteringFactor    0.1#define kRestAccelY        -0.6#define kMaxDiffX           0.2#define kMaxDiffY           0.2        rollingX = (acceleration.x * kFilteringFactor) + rollingX * (1.0 - kFilteringFactor);    rollingY = (acceleration.y * kFilteringFactor) + rollingY * (1.0 - kFilteringFactor);    float accelx = acceleration.x - rollingX;    float accely = acceleration.y - rollingY;    float accelFractionX = accelx / kMaxDiffX;        float pointsPerSecondX = (_winsize.width * 0.5) * accelFractionX;    float accelDiffY = accely - kRestAccelY;    float accelFractionY = accelDiffY / kMaxDiffY;    float pointsPerSecondY = (_winsize.height * 0.5) * accelFractionY;    _planeVelocity.x = pointsPerSecondX;    _planeVelocity.y = pointsPerSecondY;}

- (void)update:(ccTime)delta {        CGPoint offset = ccpMult(_planeVelocity, delta);        // 加速计控制精灵的移动    [_planeSprite setOffset:offset];    // 飞机转弯背景速度减慢        // 背景滚动速度调整}