Snake gameplay gif recorder

0.md

The gameplay gif you can see on https://github.com/epidemian/snake is a lie. It was not played by a person, but recorded move-by-move.

The code on record-moves.js was used to first record "player" moves one by one and then the code on replay-moves.js was used to replay them on the game.

The readme-moves.json file contains the moves used on the README.

To record the gif, byzanz-record was used, which is the only tool I found that could generate good quality gifs with good-enough frame rate.

readme-moves.json

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record-moves.js

var moves = [[]]

// Override tickTime so game never advances on its own.
window.tickTime = () => Number.MAX_VALUE

// Advance world with space bar.
document.addEventListener('keydown', (e) => {
  if (e.keyCode === 32) {
    updateWorld()
    drawWorld()
    moves.push([])
  }
})

// Override changeDirection() to record moves.
var originalChangeDirection = window.changeDirection
window.changeDirection = (dir) => {
  moves[moves.length - 1].push(dir)
  originalChangeDirection(dir)
}

// Override Math.random() so it always returns same pseudo-random values.
var LCG = seed => () => (seed = Math.imul(741103597, seed) >>> 0 ) / 2 ** 32
Math.random = LCG(0xF0000)

// Restart game to start recording.
startGame()
drawWorld()

// After recording for a while, print moves with:
// console.log(JSON.stringify(moves))

replay-moves.js

var moves = []

// Override Math.random() so it always returns same pseudo-random values.
var LCG = seed => () => (seed = Math.imul(741103597, seed) >>> 0 ) / 2 ** 32
Math.random = LCG(0xF0000)

var originalUpdateWorld = window.updateWorld
window.updateWorld = () => {
  var tickMoves = moves.shift() || []
  for (var move of tickMoves) {
    changeDirection(move)
  }
  originalUpdateWorld()
}

startGame()
drawWorld()