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GLLAngleRangeValueTransformer.swift
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GLLAngleRangeValueTransformer.swift
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//
// GLLAngleRangeValueTransformer.m
// GLLara
//
// Created by Torsten Kammer on 07.09.12.
// Copyright (c) 2012 Torsten Kammer. All rights reserved.
//
import Foundation
/*
* Exactly what it says on the tin.
* The idea is that rotations are stored from 0…2pi here, but for sliders, you really want -pi…+pi instead. This transformer solves that issue.
*/
@objc class GLLAngleRangeValueTransformer: ValueTransformer {
@objc override class func allowsReverseTransformation() -> Bool {
return true
}
@objc override class func transformedValueClass() -> AnyClass {
return NSNumber.self
}
override func transformedValue(_ value: Any?) -> Any? {
let double = (value as! NSNumber).doubleValue
if double > Double.pi {
return double - Double.pi * 2
} else {
return double
}
}
override func reverseTransformedValue(_ value: Any?) -> Any? {
let double = (value as! NSNumber).doubleValue
if double < 0.0 {
return double + Double.pi * 2
} else {
return double
} }
}