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                                            Behrad Kazemi

NaN error when touch point is the same as the centre of the circle.

in function moveHandle() : ``` func moveHandle(lastPoint:CGPoint){ //Get the center let centerPoint:CGPoint = CGPointMake(self.frame.size.width/2, self.frame.size.height/2); //Calculate the direction from a center point and a arbitrary position. //bug fix: var currentAngle:Double...