iphone - Cocos2d iPhone : Rotate Sprite using Accelerometer

Question

我正在尝试使用加速度计旋转 Sprite 。当我向右倾斜时，我希望他稍微向右旋转，当我向左倾斜时，我希望他稍微向左旋转...

提前致谢，芦苇

Answer 1

首先 - 在您的 h 文件中，您需要创建以下变量:

UIAccelerationValue accelerationX;
UIAccelerationValue accelerationY;
float currentRawReading;
float calibrationOffset;

还要确保您的 h 文件具有:

@interface myViewName : UIViewController <UIAccelerometerDelegate>

然后在您的 .m 文件中，在导入的下方放置:

#define kFilteringFactor 0.05
CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;};
CGFloat RadiansToDegrees(CGFloat radians) {return radians * 180/M_PI;};

然后在 viewDidLoad 函数的 .m 文件中添加:

UIAccelerometer *accel = [UIAccelerometer sharedAccelerometer];
accel.delegate = self;
accel.updateInterval = 1.0f/60.0f;  

还将以下函数添加到您的 .m 文件中:

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

accelerationX = acceleration.x * kFilteringFactor + accelerationX * (1.0 - kFilteringFactor);
accelerationY = acceleration.y * kFilteringFactor + accelerationY * (1.0 - kFilteringFactor);

// keep the raw reading, to use during calibrations
currentRawReading = atan2(accelerationY, accelerationX);

float rotation = -RadiansToDegrees(currentRawReading);

targetView.transform = CGAffineTransformMakeRotation(-(DegreesToRadians(rotation)));
//targetView.transform = CGAffineTransformRotate(targetView.transform, -(rotation * 3)); //if you want easing
}

您必须根据您的目标 View 或对象稍微调整它 - 但仅此而已。

希望这有帮助，

迈克尔