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// AccelerometerData.h


// Things missing
// The ability to adjust the frequency or the wobble factor
// the frequency maybe should tie into the fps of the game


#import <UIKit/UIKit.h>


@interface AccelerometerData : NSObject <UIAccelerometerDelegate>
{
        UIAccelerationValue     xyzUnitVectors[3];
}

- (AccelerometerData *) init;

- (void) accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)Acceleration;

- (void) GetXVector:(double *) unitVector;
- (void) GetYVector:(double *) unitVector;
- (void) GetZVector:(double *) unitVector;

@end

// AccelerometerData.mm

#import "AccelerometerData.h"


@implementation AccelerometerData


- (AccelerometerData *) init
{
        [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / 60)];
        [[UIAccelerometer sharedAccelerometer] setDelegate:self];

        return self;
}


- (void) accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)Acceleration
{
        double factor = 0.3;

        // This is to smooth out the wobbles
        xyzUnitVectors[0] = (Acceleration.x * factor) + (xyzUnitVectors[0] * (1 - factor));
        xyzUnitVectors[1] = (Acceleration.y * factor) + (xyzUnitVectors[1] * (1 - factor));
        xyzUnitVectors[2] = (Acceleration.z * factor) + (xyzUnitVectors[2] * (1 - factor));
}


- (void) GetXVector:(double *)unitVector
{
        *unitVector = (double)xyzUnitVectors[0];
}


- (void) GetYVector:(double *)unitVector
{
        *unitVector = (double)xyzUnitVectors[1];
}


- (void) GetZVector:(double *)unitVector
{
        *unitVector = (double)xyzUnitVectors[2];
}


@end