90 lines
3.5 KiB
Swift
90 lines
3.5 KiB
Swift
/*
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* DynamicColor
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*
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* Copyright 2015-present Yannick Loriot.
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* http://yannickloriot.com
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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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*/
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#if os(iOS) || os(tvOS) || os(watchOS)
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import UIKit
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#elseif os(OSX)
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import AppKit
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#endif
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// MARK: CIE XYZ Color Space
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public extension DynamicColor {
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/**
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Initializes and returns a color object using CIE XYZ color space component values with an observer at 2° and a D65 illuminant.
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Notes that values out of range are clipped.
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- parameter X: The mix of cone response curves, specified as a value from 0 to 95.05.
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- parameter Y: The luminance, specified as a value from 0 to 100.0.
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- parameter Z: The quasi-equal to blue stimulation, specified as a value from 0 to 108.9.
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- parameter alpha: The opacity value of the color object, specified as a value from 0.0 to 1.0. Default to 1.0.
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*/
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public convenience init(X: CGFloat, Y: CGFloat, Z: CGFloat, alpha: CGFloat = 1) {
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let clippedX = clip(X, 0, 95.05) / 100
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let clippedY = clip(Y, 0, 100) / 100
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let clippedZ = clip(Z, 0, 108.9) / 100
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let toRGB = { (c: CGFloat) -> CGFloat in
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let rgb = c > 0.0031308 ? 1.055 * pow(c, 1 / 2.4) - 0.055 : c * 12.92
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return abs(roundDecimal(rgb, precision: 1000))
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}
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let red = toRGB(clippedX * 3.2406 + clippedY * -1.5372 + clippedZ * -0.4986)
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let green = toRGB(clippedX * -0.9689 + clippedY * 1.8758 + clippedZ * 0.0415)
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let blue = toRGB(clippedX * 0.0557 + clippedY * -0.2040 + clippedZ * 1.0570)
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self.init(red: red, green: green, blue: blue, alpha: alpha)
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}
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// MARK: - Getting the XYZ Components
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/**
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Returns the XYZ (mix of cone response curves, luminance, quasi-equal to blue stimulation) components with an observer at 2° and a D65 illuminant.
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Notes that X values are between 0 to 95.05, Y values are between 0 to 100.0 and Z values are between 0 to 108.9.
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- returns: The XYZ components as a tuple (X, Y, Z).
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*/
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public final func toXYZComponents() -> (X: CGFloat, Y: CGFloat, Z: CGFloat) {
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let toSRGB = { (c: CGFloat) -> CGFloat in
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c > 0.04045 ? pow((c + 0.055) / 1.055, 2.4) : c / 12.92
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}
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let rgba = toRGBAComponents()
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let red = toSRGB(rgba.r)
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let green = toSRGB(rgba.g)
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let blue = toSRGB(rgba.b)
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let X = roundDecimal((red * 0.4124 + green * 0.3576 + blue * 0.1805) * 100, precision: 1000)
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let Y = roundDecimal((red * 0.2126 + green * 0.7152 + blue * 0.0722) * 100, precision: 1000)
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let Z = roundDecimal((red * 0.0193 + green * 0.1192 + blue * 0.9505) * 100, precision: 1000)
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return (X: X, Y: Y, Z: Z)
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}
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}
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