generateGameOfLife function

Spinner generateGameOfLife({ int? intervalInMs, })

Generates the gameOfLife spinner animation.

Runs Conway's Game of Life on a 4×8 toroidal grid using a seed that produces a cyclic sequence. Results in 14 frames.

Implementation

Spinner generateGameOfLife({int? intervalInMs}) {
  const width = 8;
  const height = 4;
  const maxGenerations = 24;
  final seed = makeGrid(height, width);

  // Place a blinker (period 2) — horizontal at row 0
  seed[0][1] = true;
  seed[0][2] = true;
  seed[0][3] = true;

  // Place a toad (period 2) — rows 2-3
  seed[2][2] = true;
  seed[2][3] = true;
  seed[2][4] = true;
  seed[3][1] = true;
  seed[3][2] = true;
  seed[3][3] = true;

  // Place a beacon (period 2) — rows 0-3, cols 5-7
  seed[0][5] = true;
  seed[0][6] = true;
  seed[1][5] = true;
  seed[2][7] = true;
  seed[3][6] = true;
  seed[3][7] = true;

  final frameList = <String>[];
  var current = seed;

  // Generate frames until we find a repeated state
  final seen = <String>{};
  for (int i = 0; i < maxGenerations; i++) {
    final frame = gridToBraille(current);
    if (!seen.add(frame)) break;
    frameList.add(frame);
    current = _nextGeneration(current, height, width);
  }

  return Spinner(frames: frameList, intervalInMs: intervalInMs ?? 120);
}