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2014/10/15 ¤U¤È 10:03:36
iphone Programming Glossary: angledifHow to rotate image around center point automatically with finger touch http://stackoverflow.com/questions/1119743/how-to-rotate-image-around-center-point-automatically-with-finger-touch float ang float.Parse Math.Atan2 dx dy .ToString do the rotation if deltaAngle 0.0 deltaAngle ang else float angleDif deltaAngle ang this.Transform CGAffineTransform.MakeRotation angleDif Hope that helped someone from spending hours on how.. if deltaAngle 0.0 deltaAngle ang else float angleDif deltaAngle ang this.Transform CGAffineTransform.MakeRotation angleDif Hope that helped someone from spending hours on how to figure out how to freaking rotate a bottle share improve this..
Implementing touch-based rotation in cocoa touch http://stackoverflow.com/questions/2780536/implementing-touch-based-rotation-in-cocoa-touch float newAngle angleBetweenLines self.middle CGPointMake self.middle.x 0 self.middle currentPoint touch angle float angleDif newAngle self.initialAngle work out dif between angle at beginning of touch and now. CGAffineTransform newTransform CGAffineTransformRotate.. angle at beginning of touch and now. CGAffineTransform newTransform CGAffineTransformRotate self.initialTransform angleDif create new transform self.transform newTransform apply transform. OR 2 Should I simply remember the last known position.. float newAngle angleBetweenLines self.middle CGPointMake self.middle.x 0 self.middle currentPoint touch angle float angleDif newAngle self.lastAngle work out dif between angle at beginning of touch and now. CGAffineTransform newTransform CGAffineTransformRotate..
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