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Cellular Automaton Explorer

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Elementary Cellular Automata

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Cellular Automata Explorer

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Elementary Cellular Automata

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2D Cellular Automata

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diff --git a/src/js/automata.js b/src/js/automata.js index b9548c9..a142b64 100644 --- a/src/js/automata.js +++ b/src/js/automata.js @@ -1,43 +1,45 @@ -// get the next evolution of a 1D CA -function evolve(state, rules) { - function evolveAcc(s, acc) { - const [x, y, z, ...xs] = s; - if (!xs.length) { - return acc[acc.length - 1] + acc + acc[0]; - } - - const rule = x + y + z; - const newAcc = acc.concat(rules[rule]); - return evolveAcc(y + z + xs.join(''), newAcc); - } - return evolveAcc(state, ''); +// handles negative index and index bigger than its array length +function guard(index, array) { + if (index > (array.length - 1)) return 0; + if (index < 0) return (array.length - 1); + return index; } -// create a 2D board from a 1D initial state +// get the next evolution of a 1D CA initial state +function evolve(state, rules) { + function getCell(index) { + const safeIndex = guard(index, state); + return state[safeIndex]; + } + const newState = state.map((_, x) => { + const cells = [ + getCell(x - 1), + getCell(x), + getCell(x + 1)]; + return rules[cells.join('')]; + }); + + return newState.map(Number); +} + +// create a 2D board from a 1D CA initial state function createBoard(state, rules, height) { function createBoardAcc(s, h, acc) { if (h === 0) return acc; - const newState = evolve(state, rules); - const newAcc = acc.concat(state); + const newState = evolve(s, rules); + const newAcc = acc.concat([s]); return createBoardAcc(newState, h - 1, newAcc); } - return createBoardAcc(state, height, []).map( - (row) => row.split('')) + return createBoardAcc(state, height, []); } +// Find the neighbor of a given cell in a 2D CA board function getCellNeighbors(board, cellCoordinates) { const [x, y] = cellCoordinates; const rowLength = board[0].length; // caca? // handles board edges where the cell is missing neighbors function getCell(xx, yy) { - // handles negative index and index bigger than its array length - function guard(index, array) { - if (index > array.length - 1) return 0; - if (index < 0) return array.length - 1; - return index; - } - const safeX = guard(xx, board); const safeY = guard(yy, rowLength); return board[safeX][safeY]; @@ -52,10 +54,13 @@ function getCellNeighbors(board, cellCoordinates) { ]; } +// Sums the value of a cell's neighbors function getNeighborsSum(cells) { return cells.reduce((cell, acc) => cell + acc, 0); } +// Get the next evolution of a cell according to +// Conway's game of life rules function conwayRules(cell, neighbors) { // loneliness rule if (cell === 1 && neighbors < 2) return 0; @@ -67,6 +72,7 @@ function conwayRules(cell, neighbors) { return cell; } +// get the next evolution of a 2D CA initial state function evolve2d(board, rulesFn) { return board.map((row, x) => row.map((cell, y) => { const neighbors = getCellNeighbors(board, [x, y]); @@ -93,15 +99,21 @@ function getDrawingValues(state, acc, cell) { ); } +// Populates the first state of a 1D CA with cells returned +// by initFn function initialState1d(width, initFn, args) { return [...Array(width)].map( - () => initFn(...args).toString(), - ).join(''); + () => initFn(...args), + ); } +// Populates the first state of a 2D CA with cells returned +// by initFn function initialState2d(width, height, initFn, args) { return [...Array(height)].map( - () => [...Array(width)].map(() => initFn(...args)), + () => [...Array(width)].map( + () => initFn(...args), + ), ); } diff --git a/src/js/main.js b/src/js/main.js index 19d8a01..0cb5785 100644 --- a/src/js/main.js +++ b/src/js/main.js @@ -1,6 +1,7 @@ -import { getRandomInt, sleep, hexToRgb } from './common.js'; +// TODO : Change board resolution according to the set cell dimensions +import { getRandomInt, sleep } from './common.js'; import { - evolve, evolve2d, getDrawingValues, initialState1d, conwayRules, createBoard, + evolve, evolve2d, getDrawingValues, initialState1d, initialState2d, conwayRules, createBoard, } from './automata.js'; let drawing = 1; @@ -42,70 +43,59 @@ function reset() { ctx.clearRect(0, 0, canvas.width, canvas.height); } -// TODO: Hide accumulator inside maybe? -async function draw(state, acc) { +async function draw(dimension) { if (drawing === 0) { return; } + const rules = getRules(); + const cellProperties = { dimensions: cellSize.value, liveColor: live.value, deadColor: dead.value, }; - // const position = acc * cell.dimension; - // if (position >= canvas.height && !loop.checked) return; + const initialState = ( + () => { + if (dimension === '1d') { + return initialState1d( + Math.floor(canvas.width / cellProperties.dimensions), + getRandomInt, + [0, 2], + ); + } + return evolve2d(initialState2d( + Math.floor(canvas.width / cellProperties.dimensions), + Math.floor(canvas.height / cellProperties.dimensions), + getRandomInt, + [0, 2]), conwayRules); + })(); - const rules = getRules(); - const board = createBoard(state, rules, canvas.height); - // const newState = evolve(state, rules); - // const line = getDrawingValues(newState, acc, cell); + const board = ( + () => { + if (dimension === '1d') return createBoard(initialState, rules, Math.floor(canvas.height / cellProperties.dimensions)); + return initialState; + })(); - board.reduce((row, prevRow, x) => { + board.map((row, y) => { const d = cellProperties.dimensions; - row.reduce((cell) => { - ctx.moveTo(x * d, y * d); - ctx.fillRect(x * d, x * d, d, d); - ctx.fillStyle = (() => { - if (cell === '1') return cellProperties.liveColor; - return cellProperties.deadColor; - })(); - }) + return row.map( + (cell, x) => { + ctx.fillStyle = ( + () => { + if (cell === 1) return cellProperties.liveColor; + return cellProperties.deadColor; + })(); + ctx.fillRect(x * d, y * d, d, d); + return cell; + }, + ); }); - - // await sleep(40); - - // const newAcc = (() => { - // if (position >= canvas.height && loop.checked) return 0; - // return acc; - // })(); - - // await draw(newState, newAcc + 1); -} - -async function draw2d(board, acc) { - if (drawing === 0) { - - } } // Listeners -startBtn2d.addEventListener('click', async () => { - reset(); - - await sleep(60); - - drawing = 1; - - const initialState = initialState2d(canvas.width, canvas.height, getRandomInt, [0, 2]); - - const nextState = evolve2d(initialState, conwayRules); - - draw2d(initialState, 0); -}); - startBtn.addEventListener('click', async () => { reset(); @@ -113,9 +103,17 @@ startBtn.addEventListener('click', async () => { drawing = 1; - const initialState = initialState1d(canvas.width, getRandomInt, [0, 2]); + draw('1d'); +}); - draw(initialState, 0); +startBtn2d.addEventListener('click', async () => { + reset(); + + await sleep(60); + + drawing = 1; + + draw('2d'); }); resetBtn.addEventListener('click', async () => { diff --git a/src/style.css b/src/style.css index b2e3975..339658d 100644 --- a/src/style.css +++ b/src/style.css @@ -6,13 +6,11 @@ body { background: black; color: white; - display: flex; font-family: Courier New; } canvas { background: #110812; - margin: 20px 0 0 0; } h1, h2 { @@ -20,7 +18,9 @@ h1, h2 { } h1 { - font-size: large; + margin : 10px auto; + font-size: larger; + text-align: center; } .menu-row h2 { @@ -28,11 +28,12 @@ h1 { padding: 10px; cursor: pointer; border: 2px solid darkgrey; + margin: 0 0 10px 0; } sidebar { flex: auto; - padding: 10px; + padding: 0 10px; } input[type="button"] { @@ -48,7 +49,6 @@ input[type="button"] { .menu-row { flex: 1; - margin: 10px 0; } label, .form-field label { @@ -59,3 +59,7 @@ label, .form-field label { #main { flex: 4; } + +#container { + display: flex; +}