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              <canvas id=c></canvas>
<div id=stats><span id=score>0</span>/<span id=outOf>0</span></div>
<div id=rules>
    Click anywhere to make an explosion.<br/>
    If any of the particles will bump into your explosion they'll explode as well, making a chain reaction.<br/>
    Click again to start a new game!<br/>
    Let's rock in this hole! Uhhh-ha-ha-ha! Let's do it!!!<br/>
    <br/>
</div>
            
          
!
            
              body, html {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: #000;
}

canvas{
    position:absolute;
    top: 0;
    left: 0;
    background: #000;
    cursor: crosshair;
}
#stats{
    color:white;
    background-color:rgba(255, 255, 255, 0.3);
    font-size:20px;
    padding:10px;
    position:absolute;
    top: 0;
    left: 0;
}
#rules{
    opacity:1;
    color:white;
    background-color:rgba(0, 0, 0, .7);
    font-size:20px;
    position:absolute;
    text-align:center;
    top:40vh;
    width:96vw;
    left:0;
    padding:2vw;
    overflow: hidden;
    max-height: 100vh;
    max-width: 100vw;
}
#rules.close {
    max-height: 0;
    max-width: 0;
    opacity: 0;

    transition: max-height 2s,opacity 2s, max-width .2s 2s;
}
            
          
!
            
              "use strict";

var w, h, amount
    , clicked = false
    , ctx = c.getContext('2d')
    , inGame = false
    , cells = []
    , cellsExplored = []

    , settings = Settings()
    , nextInit = false
    , killTimer
    , expColor
    , expImg
    ;

function restart() {
    nextInit = true;
    if (!inGame)
        init();
}

function Settings() {
    return {
        maxSize : 6
        , minSize : 2
        , maxSpeed : 2
        , speedExplosionX : 0
        , speedExplosionY : 0
        , firstExplosionDegree : 10
        , stepExplosion : 3
        , maxSizeExp : 20
        , maxColor : 255
        , minColor : 100
        , composite : 'lighter'
        , limitParticles : 1999
        , channelsR : false
        , channelsG : true
        , channelsB : true
        , restart : restart
    }
}

function getRandomColor(min) {
    return {
        r: settings.channelsR ? ((Math.random() * (255 - min)) | 0) + min : 0
        , g: settings.channelsG ? ((Math.random() * (255 - min)) | 0) + min : 0
        , b: settings.channelsB ? ((Math.random() * (255 - min)) | 0) + min : 0
    }
}

/**
 * @param {Cell} a
 * @param {Cell} b
 */
function checkExplosion(a, b) {
    if (b.exploded)
        return;
  
    var distX = a.x - b.x
        , distY = a.y - b.y
        , dist = Math.sqrt((distX * distX) + (distY * distY)) - (b.size/2)
        ;
    dist <= a.explosionSize
    && b.explode();
}

/**
 * Generate a neon ball
 * @param {Number} w width
 * @param {Number} h height
 * @param {Number} r
 * @param {Number} g
 * @param {Number} b
 * @param {Number} a alpha
 * @returns {HTMLCanvasElement}
 */
function generateFireBall(w, h, a, r, g, b) {

    r = parseInt(r);
    r = isNaN(r) || r > 255 ? 255 : r;
    g = parseInt(g);
    g = isNaN(g) || g > 255 ? 255 : g;
    b = parseInt(b);
    b = isNaN(b) || b > 255 ? 255 : b;

    var tempCanvas = document.createElement("canvas");

    tempCanvas.width = w;
    tempCanvas.height = h;

    var imgCtx = tempCanvas.getContext("2d");
    var gradient = imgCtx.createRadialGradient( w/2, h/2, 0, w/2, h/2, w/2 );

    //TODO fix for implement other colors
    function applyMask(value, mask) {
        value = Math.abs((value * mask / 255) | 0);
        return value < 256 ? value : 255;
    }

    gradient.addColorStop(0, 'rgba(' + [applyMask(r, 255), applyMask(g, 255), applyMask(b, 255), a] + ')');
    gradient.addColorStop(0.3, 'rgba(' + [applyMask(r, 254), applyMask(g, 239), applyMask(b, 29), a] + ')');
    gradient.addColorStop(0.4, 'rgba(' + [applyMask(r, 254), applyMask(g, 88), applyMask(b, 29), a] + ')');
    gradient.addColorStop(0.6, 'rgba(' + [applyMask(r, 239), applyMask(g, 27), applyMask(b, 51), a * .05] + ')');
    gradient.addColorStop(0.88, 'rgba(' + [applyMask(r, 153), applyMask(g, 10), applyMask(b, 27), a * .05] + ')');
    gradient.addColorStop(0.92, 'rgba(' + [applyMask(r, 254), applyMask(g, 39), applyMask(b, 17), a * .1] + ')');
    gradient.addColorStop(0.98, 'rgba(' + [applyMask(r, 254), applyMask(g, 254), applyMask(b, 183), a * .2] + ')');
    gradient.addColorStop(1, 'rgba(' + [applyMask(r, 254), applyMask(g, 39), applyMask(b, 17), 0] + ')');

    imgCtx.fillStyle = gradient;
    imgCtx.fillRect( 0, 0, w, h);

    return tempCanvas;
}

function Cell(size, x, y) {
    var c = this.color = getRandomColor(settings.minColor);
    this.img = canvas_utils.colorize(
        canvas_utils.resources.images.particle
        , c.r //(c.r = 0)
        , c.g
        , c.b
        , 1
    );

    this.expImg = generateFireBall(64, 64, 1, 255, c.g, c.b);

    var m = settings.maxSize > settings.minSize ? settings.maxSize : settings.minSize
        , mm = m === settings.maxSize ? settings.minSize : settings.maxSize
        ;

    this.size = size || Math.random() * (m - mm) + mm;
    this.initSize = this.size;
    this.x = x || Math.random() * w;
    this.y = y || Math.random() * h;
    this.vx = Math.random() * settings.maxSpeed * 2 - settings.maxSpeed;
    this.vy = Math.random() * settings.maxSpeed * 2 - settings.maxSpeed;
    this.exploded = false;
    this.explosionSize = settings.maxSizeExp/5;
    this.expV = settings.stepExplosion;
}

function rand(max, min) {
    min = min || 0;
    return (Math.random() * (max - min)) + min;
}

Cell.prototype.update = function () {

    var s = this.size * 2
        , s2 = s/2;

    if (!this.exploded) {
        ctx.moveTo(this.x, this.y);
    }

    this.x += this.vx * rand(rand(5));
    this.y += this.vy * rand(rand(5));

    if (this.x < 0 || this.x > w) {
        this.vx *= -1;
        this.x = this.x > 0 ? w : 0;
    }
    if (this.y < 0 || this.y > h) {
        this.vy *= -1;
        this.y = this.y > 0 ? h : 0;
    }

    if(!this.exploded) {
        ctx.lineTo(this.x, this.y);
        ctx.drawImage(this.img, this.x - s2, this.y - s2, s, s);
        return;
    }

    this.explosionSize += this.expV / this.explosionSize * 10;

    if (this.size > 0) {
        this.size -= 0.05;
    }

    if (this.explosionSize > settings.maxSizeExp * 2) {
        this.expV *= -1;
        this.vx *= 0;
        this.vy *= 0;
    }
    else if (this.explosionSize < 0) {
        cellsExplored.splice(cellsExplored.indexOf(this), 1);
        return;
    }

    s = this.explosionSize *
        (this.now && this.now-- ? 2 : 1 * ((settings.firstExplosionDegree - (this.now || 0))) || 1);

    if (this.now === undefined) {
        cells.splice(cells.indexOf(this), 1);
        cellsExplored.push(this);
    }

    this.now = this.now || settings.firstExplosionDegree;
    s2 = s/2;

    ctx.drawImage(this.expImg, this.x - s2, this.y - s2, s, s);

    var l = cells.length;
    while(l--)
        checkExplosion(this, cells[l]);
};

Cell.prototype.explode = function () {
    this.exploded = true;
    this.vx *= settings.speedExplosionX;
    this.vy *= settings.speedExplosionY;
    score.textContent = parseInt(score.textContent) + 1;
};

function click(e) {
    if (!inGame)
        init();
    else if (clicked)
        nextInit = true;
    else {
        e = e.touches && e.touches.length ? e.touches[0] : e;
        var cell = new Cell(settings.maxSize, e.pageX, e.pageY);
        cells.push(cell);
        cell.explode();
        clicked = true;
    }
}

c.addEventListener('click', click, false);
c.addEventListener('touchstart', click, false);

window.addEventListener('resize', settings.restart);

function anim() {
    if (nextInit) {
        nextInit = false;
        return init();
    }

    if (inGame)
        window.requestAnimationFrame(anim);

    ctx.save();

    ctx.globalCompositeOperation = 'destination-out';
    //ctx.fillStyle = 'rgb(0, 0, 0)';
    ctx.fillStyle = 'rgba(0, 0, 0, .2)';
    //ctx.globalAlpha = .2;
    ctx.fillRect(0, 0, w, h);
    //ctx.globalAlpha = 1;
    ctx.globalCompositeOperation = settings.composite;
    //ctx.globalCompositeOperation = 'source-over';

    ctx.fillStyle = "none";
    ctx.strokeStyle = '#fff';
    ctx.beginPath();

    var l = cells.length;
    while(l--)
        cells[l].update();

    l = cellsExplored.length;
    while(l--)
        cellsExplored[l].update();

    ctx.stroke();
    ctx.restore();

    if (!cells.length && !cellsExplored.length)
        gameOver();
}


function gameOver() {
    inGame = killTimer-- > 0;
    console.log(killTimer);
    if (!inGame) {
        rules.textContent = 'Yo-ho-ho!!! Yyyyeah!!!';
        rules.classList.remove('close');
    }
}

function init() {
    expColor = getRandomColor(settings.minColor);
    expImg = generateFireBall(64, 64, 1, expColor.r, expColor.g, expColor.b);

    w = window.innerWidth;
    h = window.innerHeight;
    amount = ((w * h) / 500) | 0;
    amount = amount > settings.limitParticles ? settings.limitParticles : amount;

    outOf.textContent = amount + 1;
    score.textContent = '0';

    c.width = w;
    c.height = h;

    ctx.fillStyle = 'black';
    ctx.fillRect(0, 0, w, h);

    cells.splice(0);
    cellsExplored.splice(0);

    var n = amount;
    while(n--)
        cells.push(new Cell);

    clicked = false;
    inGame = true;
    if (killTimer !== undefined)
        rules.className = 'close';
    killTimer = 30;

    anim();
}
init();

setTimeout(function() {
    rules.className = 'close';
}, 3000);

!function() {
    var gui = new dat.GUI({
        load : JSON
        , preset : 'Default'
    });
    var f = gui.addFolder('Particles');
    f.add(settings, 'maxSize', 0, 100).listen();
    f.add(settings, 'minSize', 0, 100).listen();
    f.add(settings, 'maxSpeed', 0, 100).listen();
    f.add(settings, 'limitParticles', 1, 10000).step(10).listen();

    f = gui.addFolder('Explosion');
    f.add(settings, 'maxSizeExp', 0, 100).listen();
    f.add(settings, 'stepExplosion', 1, 100).listen();
    f.add(settings, 'speedExplosionX', 0, 100).listen();
    f.add(settings, 'speedExplosionY', 0, 100).listen();
    f.add(settings, 'firstExplosionDegree', 2, 100).listen();

    f = gui.addFolder('Colors');
    f.add(settings, 'minColor', 0, 255).listen();
    f.add(settings, 'channelsR').listen();
    f.add(settings, 'channelsG').listen();
    f.add(settings, 'channelsB').listen();

    gui.add(settings, 'composite', [
        'source-over', 'source-in', 'source-out', 'source-atop',
        'destination-over', 'destination-in', 'destination-out', 'destination-atop',
        'lighter', 'darker', 'copy', 'xor'
    ]).listen();
    gui.add(settings, 'restart');
    gui.remember(settings);
}();
            
          
!
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