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POUsing the iPhone accelerometer to move a sprite along the x axis
 

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    <p>I am working on an iPhone game using cocos2d. I am trying to use the accelerometer for movement of a sprite in portrait mode to move left and right. For some reason with the code I am using it defaults to moving right UNLESS the phone is tilted at a 45 degree angle, i.e. the returned values are all positive(indicating it should move to the right) until it is tilted at a 45 degree angle, either left or right. Dead center is returning around 600 and then decreasing the further you tilt the phone left or right until it gets to a 45 degree angle (where it hits 0 and starts to go negative). Below is the code I am using. Any help would be GREATLY appreciate.</p> <pre><code>- (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); } </code></pre>
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