Created
June 14, 2020 18:33
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Ethereum Blockies in SwiftUI
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| struct Blockies: View { | |
| private var color: Color! | |
| private var bgColor: Color! | |
| private var spotColor: Color! | |
| private var seed: [Int32] = Array(repeating: 0, count: 4) | |
| private var pixels: [UInt8] = Array(repeating: 0, count: 100) | |
| var body: some View { | |
| VStack(alignment: .center, spacing: 0) { | |
| ForEach(0..<10) { x in | |
| HStack(alignment: .center, spacing: 0) { | |
| ForEach(0..<10) { y in | |
| self.pixel(x: x, y: y) | |
| .frame(width: 20, height: 20) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| init(data: Data) { | |
| for (i, c) in data.enumerated() { | |
| seed[i % 4] = (seed[i % 4] << 5) &- seed[i % 4] &+ Int32(c) | |
| } | |
| color = nextColor() | |
| bgColor = nextColor() | |
| spotColor = nextColor() | |
| for x in 0..<10 { | |
| for y in 0..<5 { | |
| pixels[x * 10 + y] = UInt8(nextRand() * 2.3) | |
| pixels[x * 10 + (9 - y)] = pixels[x * 10 + y] | |
| } | |
| } | |
| } | |
| private mutating func nextRand() -> Double { | |
| let t = seed[0] ^ (seed[0] << 11) | |
| seed[0] = seed[1] | |
| seed[1] = seed[2] | |
| seed[2] = seed[3] | |
| seed[3] = seed[3] ^ (seed[3] >> 19) ^ t ^ (t >> 8) | |
| let s = UInt32(bitPattern: seed[3]) | |
| return Double(s) / Double(1 << 31) | |
| } | |
| private mutating func nextColor() -> Color { | |
| let h = nextRand() | |
| let s = nextRand() * 0.6 + 0.4 | |
| let b = (nextRand() + nextRand() + nextRand() + nextRand()) / 2.0 | |
| return Color.init(hue: h, saturation: s, brightness: b) | |
| } | |
| private func pixel(x: Int, y: Int) -> some View { | |
| switch pixels[x * 10 + y] { | |
| case 0: | |
| return Rectangle().fill(bgColor) | |
| case 1: | |
| return Rectangle().fill(color) | |
| default: | |
| return Rectangle().fill(spotColor) | |
| } | |
| } | |
| } | |
| struct Blockies_Previews: PreviewProvider { | |
| static let data = "0xfb6916095ca1df60bb79ce92ce3ea74c37c5d359".data(using: .utf8)! | |
| static var previews: some View { | |
| Blockies(data: data) | |
| } | |
| } |
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