Flutter: perlin snake

main.dart

/// Generates a [ui.Image] with certain pixel data
Future<ui.Image> generateImage(Size size) async {
  int width = size.width.ceil();
  int height = size.height.ceil();

  /// PerlinNoise generator, there're lots of parameters
  /// to tweak and lots of effects possible to produce
  var noise = PerlinNoise(
      octaves: 1, frequency: 0.03, fractalType: FractalType.RigidMulti);

  var completer = Completer<ui.Image>();
  Int32List pixels = Int32List(width * height);

  for (var x = 0; x < width; x++) {
    for (var y = 0; y < height; y++) {
      int index = y * width + x;

      // Compute pixel luminance
      var luminance = noise.getPerlinFractal2(x.toDouble(), y.toDouble());

      // Turn luminance into actual color
      pixels[index] = luminance > .93 ? Colors.white.value : Colors.black.value;
      // pixels[index] = generatePixel(x, y, size);
    }
  }

  ui.decodeImageFromPixels(
    pixels.buffer.asUint8List(),
    width,
    height,
    ui.PixelFormat.bgra8888,
    (ui.Image img) {
      completer.complete(img);
    },
  );

  return completer.future;
}