75 lines
2.0 KiB
Swift
75 lines
2.0 KiB
Swift
//
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// ColorHash.swift
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// ColorHash
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//
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// Created by Atsushi Nagase on 11/25/15.
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// Copyright © 2015 LittleApps Inc. All rights reserved.
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//
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// Original Project: https://github.com/ngs/color-hash.swift
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import Foundation
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#if os(iOS) || os(tvOS)
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import UIKit
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#elseif os(watchOS)
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import WatchKit
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#elseif os(OSX)
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import AppKit
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#endif
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public class ColorHash {
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public static let defaultSaturation = [CGFloat(0.35), CGFloat(0.5), CGFloat(0.65)]
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public static let defaultBrightness = [CGFloat(0.5), CGFloat(0.65), CGFloat(0.80)]
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let seed = CGFloat(131.0)
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let seed2 = CGFloat(137.0)
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let maxSafeInteger = 9007199254740991.0 / CGFloat(137.0)
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let full = CGFloat(360.0)
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public private(set) var str: String
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public private(set) var brightness: [CGFloat]
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public private(set) var saturation: [CGFloat]
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public init(_ str: String, _ saturation: [CGFloat] = defaultSaturation, _ brightness: [CGFloat] = defaultBrightness) {
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self.str = str
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self.saturation = saturation
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self.brightness = brightness
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}
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public var bkdrHash: CGFloat {
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var hash = CGFloat(0)
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for char in "\(str)x" {
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if let scl = String(char).unicodeScalars.first?.value {
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if hash > maxSafeInteger {
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hash = hash / seed2
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}
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hash = hash * seed + CGFloat(scl)
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}
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}
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return hash
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}
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public var HSB: (CGFloat, CGFloat, CGFloat) {
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var hash = CGFloat(bkdrHash)
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let H = hash.truncatingRemainder(dividingBy: (full - 1.0)) / full
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hash /= full
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let S = saturation[Int((full * hash).truncatingRemainder(dividingBy: CGFloat(saturation.count)))]
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hash /= CGFloat(saturation.count)
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let B = brightness[Int((full * hash).truncatingRemainder(dividingBy: CGFloat(brightness.count)))]
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return (H, S, B)
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}
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#if os(iOS) || os(tvOS) || os(watchOS)
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public var color: UIColor {
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let (H, S, B) = HSB
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return UIColor(hue: H, saturation: S, brightness: B, alpha: 1.0)
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}
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#elseif os(OSX)
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public var color: NSColor {
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let (H, S, B) = HSB
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return NSColor(hue: H, saturation: S, brightness: B, alpha: 1.0)
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}
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#endif
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}
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