CODEWITHSUNDEEP
iphoneobjective-ccocos2d-iphone
tallen11
tallen11

Reputation: 1377

Why isn't my sprite moving with accelerometer?

I've been trying to fix this for hours now, with no luck. I'm trying to have my CCSprite subclass (thePlayer) move across the screen along the Y axis in relation to the tilt of the device. I've done it before, and everything should work, but for some reason it isn't. Here is the code:

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
    CGSize WinSize = [[CCDirector sharedDirector] winSize];
#define kFilteringFactor 0.1
#define kRestAccelX -0.6
#define kShipMaxPointsPerSec (WinSize.height*0.5)        
#define kMaxDiffX 0.2
    UIAccelerationValue rollingX, rollingY, rollingZ;
    rollingX = (acceleration.x * kFilteringFactor) + (rollingX * (1.0 - kFilteringFactor));
    float accelX = acceleration.x - rollingX;
    float accelDiff = accelX - kRestAccelX;
    float accelFraction = accelDiff / kMaxDiffX;
    float pointsPerSec = kShipMaxPointsPerSec * accelFraction;
    _shipPointsPerSecY = pointsPerSec;
    //CCLOG(@"PointsPerSec: %f", _shipPointsPerSecY);
    CGPoint pos = thePlayer.position;
    pos.y += _shipPointsPerSecY;
    CCLOG(@"Pos.y: %f", pos.y);
    thePlayer.position = pos;
}

- (void)update:(ccTime)dt
{
    CGSize WinSize = [[CCDirector sharedDirector] winSize];
    float maxY = WinSize.height - thePlayer.contentSize.height / 2;
    float minY = thePlayer.contentSize.height/2;
    float derp = _shipPointsPerSecY;
    //CCLOG(@"Derp: %f", derp);
    float newY = thePlayer.position.y + (_shipPointsPerSecY * dt);
    //CCLOG(@"NewY: %f", newY);
    newY = MIN(MAX(newY, minY), maxY);
    thePlayer.position = ccp(thePlayer.position.x, newY);
    //CCLOG(@"Player position Y: %f", thePlayer.position.y);
}

This is probably the second most annoying problem I have ever had, so any help is appreciated, thanks.

Upvotes: 0

Views: 215

Answers (1)

johnbakers
johnbakers

Reputation: 24771

It looks like your pos.y is ultimately being adjusted based on acceleration.x; just want to make sure you are not confusing your X and Y values.

Also note that X and Y from an accelerometer usually relate to the same alignment of the screen, regardless of its orientation. Thus in landscape, acceleration.x is actually your Y value, and vice-versa. In case that applies here as well.

Upvotes: 1

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