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Random pastel colors
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struct ContentView: View { | |
@State var color: Color = .Pastel.random() | |
var body: some View { | |
Rectangle() | |
.foregroundColor(color) | |
.onTapGesture { | |
color = .Pastel.random() | |
} | |
} | |
} | |
// | |
public extension Color { | |
enum Pastel { | |
case `default` | |
case oklab | |
var color: Color { | |
switch self { | |
case .default: | |
return Color( | |
hue: .random(in: 0...1), | |
saturation: .random(in: 0.25...0.95), | |
brightness: .random(in: 0.85...0.95) | |
) | |
case .oklab: | |
let chroma: Double = 0.07 | |
let hue: Angle = .init(degrees: .random(in: 0...360)) | |
return Color( | |
lightness: 0.84, | |
a: chroma * cos(hue.radians), | |
b: chroma * sin(hue.radians) | |
) | |
} | |
} | |
static func random(_ mode: Pastel = .oklab) -> Color { | |
mode.color | |
} | |
} | |
/// A `Color` defined in the OKLab color space. | |
/// | |
/// - Parameters: | |
/// - l: Perceived lightness. | |
/// - a: How green/red the color is. | |
/// - b: How blue/yellow the color is. | |
/// from: https://gist.github.com/robb/56f4dd4b2ae0acdc16739f2f63d00e8e | |
private init(lightness l: Double, a: Double, b: Double, opacity: Double = 1) { | |
let l_ = l + 0.3963377774 * a + 0.2158037573 * b | |
let m_ = l - 0.1055613458 * a - 0.0638541728 * b | |
let s_ = l - 0.0894841775 * a - 1.2914855480 * b | |
let l = l_ * l_ * l_ | |
let m = m_ * m_ * m_ | |
let s = s_ * s_ * s_ | |
let r = +4.0767416621 * l - 3.3077115913 * m + 0.2309699292 * s | |
let g = -1.2684380046 * l + 2.6097574011 * m - 0.3413193965 * s | |
let b = -0.0041960863 * l - 0.7034186147 * m + 1.7076147010 * s | |
self.init(.sRGBLinear, red: r, green: g, blue: b, opacity: opacity) | |
} | |
} |
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