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POHow can I rotate an image in response to the iPhone's accelerometer?
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copied!<p>hai , i use accelerometer to rotate uiimageview through device orientation like UIInterfaceOrientationLandscapeRight,etc. if i dont use device orientation,(if i put iphone on the table , accelerometer must work in particular angle.The device is in UIInterfaceOrientationPortrait)how can i do it? i rotate the image through center of that imageview ,but i could not understand in which angle it is rotated ,is it rotating based on the center(as origin) ? (<strong>i want graphical representation with origin</strong>)if i want to stop rotation in particular angle,how can i do it?the code : anyone can help me...?</p> <pre><code>- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { rollingX = (acceleration.x * 0.1) + (rollingX * (1.0 - 0.1)); rollingY = (acceleration.y * 0.1) + (rollingY * (1.0 - 0.1)); float xx = -rollingX; float yy = rollingY; float angle = atan2(yy, xx); self.angle += M_PI / 2.0; if(self.angle >= -2.25 && self.angle <= -0.25) { if(deviceOrientation != UIInterfaceOrientationPortrait) { deviceOrientation = UIInterfaceOrientationPortrait; self.updatingIsEnabled =YES; self.foamView.center = CGPointMake(center.x,center.y); } } else if(self.angle >= -1.75 && self.angle <= 0.75) { if(deviceOrientation != UIInterfaceOrientationLandscapeRight) { deviceOrientation = UIInterfaceOrientationLandscapeRight; self.updatingIsEnabled =YES; } } else if(self.angle >= 0.75 && self.angle <= 2.25) { if(deviceOrientation != UIInterfaceOrientationPortraitUpsideDown) { deviceOrientation = UIInterfaceOrientationPortraitUpsideDown; self.updatingIsEnabled =YES; self.foamView.center = CGPointMake(center.x,center.y); } } else if(self.angle <= -2.25 || self.angle >= 2.25) { if(deviceOrientation != UIInterfaceOrientationLandscapeLeft) { deviceOrientation = UIInterfaceOrientationLandscapeLeft; self.updatingIsEnabled =YES; self.foamView.center = CGPointMake(center.x,center.y); } } } </code></pre>

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