CGPoint CGPointRotatedAroundPoint(CGPoint point, CGPoint pivot, CGFloat degrees)
{
CGAffineTransform translation, rotation;
translation = CGAffineTransformMakeTranslation(-pivot.x, -pivot.y);
point = CGPointApplyAffineTransform(point, translation);
rotation = CGAffineTransformMakeRotation(degrees * M_PI/180.0);
point = CGPointApplyAffineTransform(point, rotation);
translation = CGAffineTransformMakeTranslation(pivot.x, pivot.y);
point = CGPointApplyAffineTransform(point, translation);
return point;
}
CGAffineTransform CGAffineTransformTranslate(CGAffineTransform T,CGFloat tx,CGFloat ty) {
return CGAffineTransformConcat(T,CGAffineTransformMakeTranslation(tx,ty));
}
