55 lines
1.9 KiB
Swift
55 lines
1.9 KiB
Swift
//
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// Copyright (c) 2017 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import Foundation
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public extension Double {
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/**
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Type of rounding double value
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- Normal: From 167.567 you will get 167.6
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- Down: From 167.567 you will get 167.5
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*/
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enum RoundingType {
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case normal
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case down
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}
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/**
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Rounding of double value
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- parameter precision: significant digits after decimal point
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- parameter roundType: rounding type
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- returns: rounded value
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*/
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func roundValue(withPrecision precision: UInt,
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roundType: RoundingType = .normal) -> Double {
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let divider = pow(10.0, Double(precision))
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switch roundType {
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case .normal:
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return (self * divider).rounded(.toNearestOrEven) / divider
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case .down:
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return (self * divider).rounded(.down) / divider
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}
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}
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}
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