54 lines
2.1 KiB
Swift
54 lines
2.1 KiB
Swift
//
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// HSL.swift
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//
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// Created by 1024jp on 2021-05-08.
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/*
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The MIT License (MIT)
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© 2014-2022 1024jp
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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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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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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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/// Calculate the correspondent saturation in HSB color space from the saturation and lightness in HSL color space.
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///
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/// - Parameters:
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/// - saturation: The saturation value in HSL color space.
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/// - lightness: The lightness value in HSL color space.
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/// - Returns: A saturation value in HSB color space.
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func hsbSaturation<Value: BinaryFloatingPoint>(saturation: Value, lightness: Value) -> Value {
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let brightness = hsbBrightness(saturation: saturation, lightness: lightness)
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return 2 * (1 - lightness / brightness)
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}
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/// Calculate the correspondent brightness in HSB color space from the saturation and lightness in HSL color space.
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///
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/// - Parameters:
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/// - saturation: The saturation value in HSL color space.
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/// - lightness: The lightness value in HSL color space.
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/// - Returns: A brightness value in HSB color space.
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func hsbBrightness<Value: BinaryFloatingPoint>(saturation: Value, lightness: Value) -> Value {
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return lightness + saturation * min(lightness, 1 - lightness)
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}
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