使用iPhone加速度计沿x轴移动精灵

时间:2013-02-16 01:15:03

标签: iphone objective-c xcode cocos2d-iphone uiaccelerometer

我正在使用cocos2d开发iPhone游戏。我正在尝试使用加速计在纵向模式下移动精灵来左右移动。出于某些原因,我使用的代码默认为向右移动除非手机以45度角倾斜,即返回的值都是正的(表示它应该向右移动),直到它以45度角倾斜,左或右。死点中心返回600左右然后逐渐减小你向左或向右倾斜手机直到它达到45度角(它达到0并开始变为负值)。以下是我正在使用的代码。任何帮助都会非常感激。

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {

        #define kFilteringFactor 0.75
            static UIAccelerationValue rollingX = 0, rollingY = 0, rollingZ = 0;

            rollingX = (acceleration.x * kFilteringFactor) +
            (rollingX * (1.0 - kFilteringFactor));
            rollingY = (acceleration.y * kFilteringFactor) +
            (rollingY * (1.0 - kFilteringFactor));
            rollingZ = (acceleration.z * kFilteringFactor) +
            (rollingZ * (1.0 - kFilteringFactor));

            float accelX = rollingX;
            float accelY = rollingY;
            float accelZ = rollingZ;

            CGSize winSize = [CCDirector sharedDirector].winSize;

        #define kRestAccelX 0.6
        #define kShipMaxPointsPerSec (winSize.height*0.5)
        #define kMaxDiffX 0.2

            float accelDiffX = kRestAccelX - ABS(accelX);
            float accelFractionX = accelDiffX / kMaxDiffX;
            float pointsPerSecX = kShipMaxPointsPerSec * accelFractionX;

            _shipPointsPerSecX = pointsPerSecX;
            NSLog(@"_shipPointsPerSecX: %f", _shipPointsPerSecX);
}

- (void)updateShipPos:(ccTime)dt {

    CGSize winSize = [CCDirector sharedDirector].winSize;

    float maxX = winSize.width - _ship.contentSize.width/2;
    float minX = _ship.contentSize.width/2;

    float newX = _ship.position.x + (_shipPointsPerSecX * dt);
    newX = MIN(MAX(newX, minX), maxX);
    _ship.position = ccp(newX, _ship.position.y);
   // NSLog(@"newx: %f", newX);

}

1 个答案:

答案 0 :(得分:1)

基本上,您的加速度计应该做的是更新加速度(使用像您一样的过滤因子)。

但是在它旁边你应该保持速度和位置,并在你的预定步骤(浮动dt)函数中进行调整:

速度+ =加速度* dt 位置+ =速度* dt

为x和y执行此操作