LittleJS-AI/games/2048.html at main · UsersFirst/LittleJS-AI · GitHub

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<!DOCTYPE html><head>
<title>LittleJS 2048</title>
<meta charset=utf-8>
</head><body style="background:#000">
<script src="../dist/littlejs.js?1.18.15"></script>
<script src="../templates/soundGenerator.js"></script>
<script>
'use strict';

// engine settings, do not remove
debugWatermark = false;
showEngineVersion = false;
paused = false;

gravity = vec2(0, 0);
cameraPos = vec2(0, 0);
cameraScale = 32;
enablePhysicsSolver = false;
showSplashScreen = false;
fontDefault = 'arial';

///////////////////////////////////////////////////////////////////////////////
// 2048 Game

const GRID = 4;
const CELL_SIZE = 1;
const GAP = .12;

const SLIDE_TIME = .12;       // seconds for a tile to slide to its new cell
const SPAWN_TIME = .14;       // grow-in time for a newly spawned tile
const MERGE_POP_TIME = .18;   // brief pulse on the survivor after a merge

let tiles = [];               // every visible tile (including the dying ones during a slide)
let grid;                     // grid[y][x] = tile reference or null (logical state)
let animT = 0;                // remaining slide time; input is locked while > 0
let pendingSpawn = false;

let score = 0;
let best = 0;
let gameOver = false;
let won = false;
let continueAfterWin = false;

let swipeStartScreen;
let swipeArmed = false;

let sMove, sMerge, sSpawn, sLose, sWin;

function gameInit()
{
    canvasClearColor = hsl(0, 0, .08);

    best = +localStorage.getItem('ljs2048_best') || 0;

    sMove  = new SoundGenerator({frequency: 260, release: .06, volume: .7, randomness: .02});
    sMerge = new SoundGenerator({frequency: 190, pitchJump: 320, pitchJumpTime: .02, release: .14, volume: .9, randomness: .02});
    sSpawn = new SoundGenerator({frequency: 520, release: .05, volume: .35, randomness: .05});
    sLose  = new SoundGenerator({frequency: 120, slide: -.15, release: .35, volume: .9, randomness: .02});
    sWin   = new SoundGenerator({frequency: 620, pitchJump: 220, pitchJumpTime: .05, release: .25, volume: 1, randomness: .01});

    newGame();
}

///////////////////////////////////////////////////////////////////////////////
function makeTile(value, gx, gy)
{
    return {
        value,              // logical value (used for merges)
        shownValue: value,  // value rendered on the tile (lags behind during a merge slide)
        gx, gy,             // target grid coords
        ax: gx, ay: gy,     // current animated grid coords (rendered)
        srcX: gx, srcY: gy, // animation start coords for this slide
        spawnT: 0,          // > 0 while the spawn-pop is playing
        mergeT: 0,          // > 0 while the merge-pop is playing
        pendingMerge: false,// becomes true at move time; resolves at slide end
        dying: false,       // absorbed tile; removed after the slide
    };
}

function newGame()
{
    score = 0;
    gameOver = false;
    won = false;
    continueAfterWin = false;
    animT = 0;
    pendingSpawn = false;

    tiles = [];
    grid = [];
    for (let y = 0; y < GRID; ++y)
    {
        grid[y] = [];
        for (let x = 0; x < GRID; ++x) grid[y][x] = null;
    }

    addRandomTile();
    addRandomTile();
}

function boardWorldSize()
{
    return GRID * CELL_SIZE + (GRID + 1) * GAP;
}

function cellCenterWorld(x, y)
{
    const s = boardWorldSize();
    const o = -s / 2;
    return vec2(
        o + GAP + CELL_SIZE / 2 + x * (CELL_SIZE + GAP),
        o + GAP + CELL_SIZE / 2 + (GRID - 1 - y) * (CELL_SIZE + GAP)
    );
}

function empties()
{
    const e = [];
    for (let y = 0; y < GRID; ++y)
        for (let x = 0; x < GRID; ++x)
            if (!grid[y][x]) e.push([x, y]);
    return e;
}

function addRandomTile()
{
    const e = empties();
    if (!e.length) return false;
    const [x, y] = e[(Math.random() * e.length) | 0];
    const v = Math.random() < .9 ? 2 : 4;
    const t = makeTile(v, x, y);
    t.spawnT = SPAWN_TIME;
    grid[y][x] = t;
    tiles.push(t);
    sSpawn.play();
    return true;
}

function canMove()
{
    for (let y = 0; y < GRID; ++y)
        for (let x = 0; x < GRID; ++x)
        {
            const t = grid[y][x];
            if (!t) return true;
            const r = grid[y][x + 1], d = grid[y + 1] && grid[y + 1][x];
            if (r && r.value === t.value) return true;
            if (d && d.value === t.value) return true;
        }
    return false;
}

// Process one row/column of tiles in travel order (front-most first).
// Mutates tile.value / tile.pendingMerge / tile.dying as merges resolve.
// Returns each surviving tile's destination index within the line.
function processLine(line, mergedRef)
{
    const result = [];
    let i = 0;
    while (i < line.length)
    {
        const a = line[i];
        const b = line[i + 1];
        if (b && b.value === a.value)
        {
            a.value *= 2;
            a.pendingMerge = true;
            b.dying = true;
            score += a.value;
            mergedRef.merged = true;
            if (a.value >= 2048 && !won) { won = true; sWin.play(); }
            result.push({tile: a, dst: result.length, absorbed: b});
            i += 2;
        }
        else
        {
            result.push({tile: a, dst: result.length});
            i += 1;
        }
    }
    return result;
}

function applyMove(dir)
{
    if (gameOver) return;
    if (won && !continueAfterWin) return;
    if (animT > 0) return; // ignore input while a slide is in flight

    let anyMoved = false;
    const mergedRef = {merged: false};

    const horizontal = dir === 'L' || dir === 'R';
    const forward = dir === 'L' || dir === 'U'; // travel toward grid-coord 0

    for (let outer = 0; outer < GRID; ++outer)
    {
        // Collect tiles in travel order along this row/column
        const line = [];
        for (let i = 0; i < GRID; ++i)
        {
            const inner = forward ? i : GRID - 1 - i;
            const t = horizontal ? grid[outer][inner] : grid[inner][outer];
            if (t) line.push(t);
        }
        const result = processLine(line, mergedRef);
        for (const r of result)
        {
            const dstAlong = forward ? r.dst : GRID - 1 - r.dst;
            const newX = horizontal ? dstAlong : outer;
            const newY = horizontal ? outer    : dstAlong;
            if (r.tile.gx !== newX || r.tile.gy !== newY) anyMoved = true;
            r.tile.gx = newX;
            r.tile.gy = newY;
            if (r.absorbed)
            {
                r.absorbed.gx = newX;
                r.absorbed.gy = newY;
                anyMoved = true;
            }
        }
    }

    if (!anyMoved) return;

    // Rebuild grid pointers from the new (gx, gy) on surviving tiles
    for (let y = 0; y < GRID; ++y)
        for (let x = 0; x < GRID; ++x) grid[y][x] = null;
    for (const t of tiles)
    {
        if (t.dying) continue;
        grid[t.gy][t.gx] = t;
    }

    // Capture each tile's current animated position as the slide's start point
    for (const t of tiles) { t.srcX = t.ax; t.srcY = t.ay; }
    animT = SLIDE_TIME;
    pendingSpawn = true;

    if (mergedRef.merged) sMerge.play();
    else sMove.play();

    best = max(best, score);
    localStorage.setItem('ljs2048_best', best);
}

function updateAnimations()
{
    if (animT > 0)
    {
        animT -= timeDelta;
        if (animT <= 0)
        {
            // Slide complete: snap, resolve merges, spawn next tile, check end
            animT = 0;
            tiles = tiles.filter(t => !t.dying);
            for (const t of tiles)
            {
                t.ax = t.srcX = t.gx;
                t.ay = t.srcY = t.gy;
                if (t.pendingMerge)
                {
                    t.pendingMerge = false;
                    t.shownValue = t.value;
                    t.mergeT = MERGE_POP_TIME;
                }
            }
            if (pendingSpawn)
            {
                pendingSpawn = false;
                addRandomTile();
                if (!canMove()) { gameOver = true; sLose.play(); }
            }
        }
        else
        {
            const p = 1 - animT / SLIDE_TIME;
            const eased = p * (2 - p); // ease-out quad — fast start, soft landing
            for (const t of tiles)
            {
                t.ax = lerp(t.srcX, t.gx, eased);
                t.ay = lerp(t.srcY, t.gy, eased);
            }
        }
    }

    for (const t of tiles)
    {
        if (t.spawnT > 0) t.spawnT = max(0, t.spawnT - timeDelta);
        if (t.mergeT > 0) t.mergeT = max(0, t.mergeT - timeDelta);
    }
}

function readMoveInput()
{
    if (animT > 0) return; // input locked during slide

    if (keyWasPressed('ArrowLeft')  || keyWasPressed('KeyA')) return 'L';
    if (keyWasPressed('ArrowRight') || keyWasPressed('KeyD')) return 'R';
    if (keyWasPressed('ArrowUp')    || keyWasPressed('KeyW')) return 'U';
    if (keyWasPressed('ArrowDown')  || keyWasPressed('KeyS')) return 'D';

    if (mouseWasPressed(0))
    {
        swipeStartScreen = mousePosScreen.copy();
        swipeArmed = true;
    }
    if (swipeArmed && mouseWasReleased(0))
    {
        swipeArmed = false;
        const d = mousePosScreen.subtract(swipeStartScreen);
        const ax = abs(d.x), ay = abs(d.y);
        const minSwipe = 40;
        if (max(ax, ay) < minSwipe) return;
        if (ax > ay) return d.x < 0 ? 'L' : 'R';
        return d.y < 0 ? 'U' : 'D';
    }
}

///////////////////////////////////////////////////////////////////////////////
function gameUpdate()
{
    updateAnimations();

    if (keyWasPressed('KeyR')) newGame();
    if (won && !continueAfterWin && keyWasPressed('KeyC')) continueAfterWin = true;

    const dir = readMoveInput();
    if (dir) applyMove(dir);
}

///////////////////////////////////////////////////////////////////////////////
function gameUpdatePost()
{
    cameraPos = vec2(0, 0);
    const s = boardWorldSize();
    const margin = 1.1;
    const viewPixels = min(mainCanvasSize.x, mainCanvasSize.y * 0.78);
    cameraScale = viewPixels / (s + margin * 2);
}

///////////////////////////////////////////////////////////////////////////////
function tileFillColor(v)
{
    const p = clamp((Math.log2(v) - 1) / 11, 0, 1);
    const hue = .12 - .10 * p;
    const sat = .55 + .25 * p;
    const lit = .80 - .38 * p;
    return hsl(hue, sat, lit);
}

function tileTextColor(v)
{
    return v <= 4 ? hsl(0, 0, .15) : hsl(0, 0, .98);
}

function gameRender()
{
    drawRect(cameraPos, vec2(200), hsl(0, 0, .09));

    const boardSize = boardWorldSize();
    drawRect(vec2(0, 0), vec2(boardSize), hsl(0, 0, .18));

    for (let y = 0; y < GRID; ++y)
    for (let x = 0; x < GRID; ++x)
        drawRect(cellCenterWorld(x, y), vec2(CELL_SIZE), hsl(0, 0, .25));

    // Dying tiles render under their absorber so the new value isn't revealed
    // until the slide finishes
    const sorted = tiles.slice().sort((a, b) => (a.dying ? 0 : 1) - (b.dying ? 0 : 1));
    for (const t of sorted)
    {
        const c = cellCenterWorld(t.ax, t.ay);

        let scale = 1;
        if (t.spawnT > 0)
            scale = smoothStep(1 - t.spawnT / SPAWN_TIME);
        if (t.mergeT > 0)
            scale *= 1 + .18 * (t.mergeT / MERGE_POP_TIME);

        const size = vec2(CELL_SIZE * .92 * scale);
        drawRect(c, size, tileFillColor(t.shownValue));

        if (scale > .35)
        {
            const digits = ('' + t.shownValue).length;
            const textSize = clamp(.52 - .07 * (digits - 1), .24, .52) * scale;
            drawText(
                '' + t.shownValue,
                c.add(vec2(0, -textSize * .06)),
                textSize,
                tileTextColor(t.shownValue),
                .08,
                hsl(0, 0, .05)
            );
        }
    }
}

///////////////////////////////////////////////////////////////////////////////
function gameRenderPost()
{
    const topY = 54;
    drawTextScreen('2048', vec2(86, topY), 64, hsl(.12, .7, .9), 6, hsl(0, 0, 0));
    drawTextScreen(`Score: ${score}`, vec2(mainCanvasSize.x / 2, topY), 34, hsl(0, 0, 1), 4, hsl(0, 0, 0));
    drawTextScreen(`Best: ${best}`, vec2(mainCanvasSize.x - 110, topY), 28, hsl(0, 0, .9), 4, hsl(0, 0, 0));
    drawTextScreen('Arrows/WASD or swipe · R = restart', vec2(mainCanvasSize.x / 2, mainCanvasSize.y - 22), 20, hsl(0, 0, .8), 3, hsl(0, 0, 0));

    if (won && !continueAfterWin)
    {
        drawRect(vec2(mainCanvasSize.x / 2, mainCanvasSize.y / 2), mainCanvasSize, hsl(0, 0, 0, .55), 0, false, true);
        drawTextScreen('You made 2048!', vec2(mainCanvasSize.x / 2, mainCanvasSize.y / 2 - 30), 56, hsl(.25, .7, .9), 6, hsl(0, 0, 0));
        drawTextScreen('Press C to keep going', vec2(mainCanvasSize.x / 2, mainCanvasSize.y / 2 + 28), 28, hsl(0, 0, 1), 4, hsl(0, 0, 0));
    }

    if (gameOver)
    {
        drawRect(vec2(mainCanvasSize.x / 2, mainCanvasSize.y / 2), mainCanvasSize, hsl(0, 0, 0, .65), 0, false, true);
        drawTextScreen('Game Over', vec2(mainCanvasSize.x / 2, mainCanvasSize.y / 2 - 18), 64, hsl(0, 0, 1), 6, hsl(0, 0, 0));
        drawTextScreen('Press R to restart', vec2(mainCanvasSize.x / 2, mainCanvasSize.y / 2 + 36), 28, hsl(0, 0, .9), 4, hsl(0, 0, 0));
    }
}

///////////////////////////////////////////////////////////////////////////////
engineInit(gameInit, gameUpdate, gameUpdatePost, gameRender, gameRenderPost);

</script>