Simple Swarm

In this example below you will see how to do a Simple Swarm with some HTML / CSS and Javascript

Just a late night swarm I created when I couldn't sleep.

Thumbnail
This awesome code was written by AyeAyeHayden, you can see more from this user in the personal repository.
You can find the original code on Codepen.io
Copyright AyeAyeHayden ©
  • HTML
  • CSS
  • JavaScript
<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  <title>Simple Swarm</title>
  
  
  
      <link rel="stylesheet" href="css/style.css">

  
</head>

<body>

  <canvas id="display"></canvas>
  
  

    <script  src="js/index.js"></script>




</body>

</html>

/*Downloaded from https://www.codeseek.co/AyeAyeHayden/simple-swarm-NxKjvO */
body {
  margin: 0;
  padding: 0;
}

canvas {
  width: 100%;
  height: 100%;
  position: absolute;
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/183082/black-texture.png);
  background-size: 100%;
}

/*Downloaded from https://www.codeseek.co/AyeAyeHayden/simple-swarm-NxKjvO */
(function() {
  //############### Globals ############################
  //####################################################
  var animate, canvas, ctx, cx, cy, h, resizeCanvas, t0, twig, twigCount, twigs, w;

  twigs = [];

  //############# Canvas Setup ##########################
  //#####################################################
  canvas = document.querySelector("#display");

  ctx = canvas.getContext("2d");

  w = canvas.width;

  h = canvas.height;

  cx = w / 2;

  cy = h / 2;

  t0 = Date.now();

  twigCount = 1000;

  //############# Classes ###############################
  //#####################################################
  twig = class twig {
    constructor() {
      this.init();
      this.r = 55;
      this.g = 255;
      this.b = 118;
      this.dg = -1;
      this.db = 1;
      this.dr = 1;
    }

    init() {
      this.a = Math.random() * .4 + .1;
      this.theta = Math.random() * Math.PI * 2;
      this.dTheta = Math.random() * .005 + .002;
      this.x = cx;
      this.y = cy;
      this.mag = Math.random() * 15 + 5;
      this.dx = this.mag * Math.cos(this.theta);
      return this.dy = this.mag * Math.sin(this.theta);
    }

    update(m) {
      var ref, ref1, ref2;
      this.r += this.dr;
      this.g -= this.dg;
      this.b += this.db;
      if (!((255 > (ref = this.r) && ref > 0))) {
        this.dr *= -1;
      }
      if (!((255 > (ref1 = this.g) && ref1 > 0))) {
        this.dg *= -1;
      }
      if (!((255 > (ref2 = this.b) && ref2 > 0))) {
        this.db *= -1;
      }
      this.x += this.dx * m;
      this.y += this.dy * m;
      this.theta += this.dTheta;
      this.dx = this.mag * Math.cos(this.theta);
      this.dy = this.mag * Math.sin(this.theta);
      return this.dTheta += Math.random() * .0002 - .0001;
    }

    checkWalls() {
      var ref, ref1;
      if (!((0 < (ref = this.x) && ref < w) && (0 < (ref1 = this.y) && ref1 < h))) {
        return this.init();
      }
    }

    render() {
      ctx.strokeStyle = `rgba(${this.r},${this.g},${this.b}, ${this.a})`;
      ctx.lineWidth = 5;
      ctx.beginPath();
      ctx.moveTo(this.x, this.y);
      ctx.lineTo(this.x + this.dx, this.y + this.dy);
      ctx.closePath();
      return ctx.stroke();
    }

  };

  
  //###################### Helpers #######################
  //######################################################
  resizeCanvas = function() {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
    w = canvas.width;
    h = canvas.height;
    cx = w / 2;
    cy = h / 2;
    return canvas.width = canvas.width;
  };

  //################### Main ############################
  //######################################################
  window.onload = function() {
    var i, ref, t;
    window.addEventListener('resize', resizeCanvas, false);
    resizeCanvas();
    for (t = i = 0, ref = twigCount; (0 <= ref ? i < ref : i > ref); t = 0 <= ref ? ++i : --i) {
      twigs.push(new twig());
    }
    return animate();
  };

  animate = function() {
    var delta, i, ref, t, t1;
    ctx.clearRect(0, 0, w, h);
    t1 = Date.now();
    delta = t1 - t0;
    t0 = t1;
    for (t = i = 0, ref = twigCount; (0 <= ref ? i < ref : i > ref); t = 0 <= ref ? ++i : --i) {
      twigs[t].update(delta / 1000);
      twigs[t].checkWalls();
      twigs[t].render();
    }
    return requestAnimationFrame(animate);
  };

}).call(this);

//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"","sourceRoot":"","sources":["<anonymous>"],"names":[],"mappings":"AAAA;EAAA;;AAAA,MAAA,OAAA,EAAA,MAAA,EAAA,GAAA,EAAA,EAAA,EAAA,EAAA,EAAA,CAAA,EAAA,YAAA,EAAA,EAAA,EAAA,IAAA,EAAA,SAAA,EAAA,KAAA,EAAA;;EAEA,KAAA,GAAQ,GAFR;;;;EAKA,MAAA,GAAS,QAAQ,CAAC,aAAT,CAAuB,UAAvB;;EACT,GAAA,GAAM,MAAM,CAAC,UAAP,CAAkB,IAAlB;;EACN,CAAA,GAAI,MAAM,CAAC;;EACX,CAAA,GAAI,MAAM,CAAC;;EACX,EAAA,GAAK,CAAA,GAAI;;EACT,EAAA,GAAK,CAAA,GAAI;;EACT,EAAA,GAAK,IAAI,CAAC,GAAL,CAAA;;EACL,SAAA,GAAY,KAZZ;;;;EAiBM,OAAN,MAAA,KAAA;IACC,WAAa,CAAA,CAAA;MACZ,IAAC,CAAA,IAAD,CAAA;MACA,IAAC,CAAA,CAAD,GAAK;MACL,IAAC,CAAA,CAAD,GAAK;MACL,IAAC,CAAA,CAAD,GAAK;MACL,IAAC,CAAA,EAAD,GAAM,CAAC;MACP,IAAC,CAAA,EAAD,GAAM;MACN,IAAC,CAAA,EAAD,GAAM;IAPM;;IASb,IAAM,CAAA,CAAA;MACL,IAAC,CAAA,CAAD,GAAK,IAAI,CAAC,MAAL,CAAA,CAAA,GAAgB,EAAhB,GAAqB;MAC1B,IAAC,CAAA,KAAD,GAAS,IAAI,CAAC,MAAL,CAAA,CAAA,GAAgB,IAAI,CAAC,EAArB,GAA0B;MACnC,IAAC,CAAA,MAAD,GAAU,IAAI,CAAC,MAAL,CAAA,CAAA,GAAgB,IAAhB,GAAuB;MACjC,IAAC,CAAA,CAAD,GAAK;MACL,IAAC,CAAA,CAAD,GAAK;MACL,IAAC,CAAA,GAAD,GAAO,IAAI,CAAC,MAAL,CAAA,CAAA,GAAgB,EAAhB,GAAqB;MAC5B,IAAC,CAAA,EAAD,GAAM,IAAC,CAAA,GAAD,GAAK,IAAI,CAAC,GAAL,CAAS,IAAC,CAAA,KAAV;aACX,IAAC,CAAA,EAAD,GAAM,IAAC,CAAA,GAAD,GAAK,IAAI,CAAC,GAAL,CAAS,IAAC,CAAA,KAAV;IARN;;IAUN,MAAQ,CAAC,CAAD,CAAA;AACP,UAAA,GAAA,EAAA,IAAA,EAAA;MAAA,IAAC,CAAA,CAAD,IAAM,IAAC,CAAA;MACP,IAAC,CAAA,CAAD,IAAM,IAAC,CAAA;MACP,IAAC,CAAA,CAAD,IAAM,IAAC,CAAA;MACP,IAAG,CAAG,CAAC,CAAA,GAAA,UAAM,IAAC,CAAA,EAAP,OAAA,GAAW,CAAX,CAAD,CAAN;QACC,IAAC,CAAA,EAAD,IAAO,CAAC,EADT;;MAEA,IAAG,CAAG,CAAC,CAAA,GAAA,WAAM,IAAC,CAAA,EAAP,QAAA,GAAW,CAAX,CAAD,CAAN;QACC,IAAC,CAAA,EAAD,IAAO,CAAC,EADT;;MAEA,IAAG,CAAG,CAAC,CAAA,GAAA,WAAM,IAAC,CAAA,EAAP,QAAA,GAAW,CAAX,CAAD,CAAN;QACC,IAAC,CAAA,EAAD,IAAO,CAAC,EADT;;MAEA,IAAC,CAAA,CAAD,IAAM,IAAC,CAAA,EAAD,GAAM;MACZ,IAAC,CAAA,CAAD,IAAM,IAAC,CAAA,EAAD,GAAM;MACZ,IAAC,CAAA,KAAD,IAAU,IAAC,CAAA;MACX,IAAC,CAAA,EAAD,GAAM,IAAC,CAAA,GAAD,GAAK,IAAI,CAAC,GAAL,CAAS,IAAC,CAAA,KAAV;MACX,IAAC,CAAA,EAAD,GAAM,IAAC,CAAA,GAAD,GAAK,IAAI,CAAC,GAAL,CAAS,IAAC,CAAA,KAAV;aACX,IAAC,CAAA,MAAD,IAAW,IAAI,CAAC,MAAL,CAAA,CAAA,GAAgB,KAAhB,GAAwB;IAf5B;;IAiBR,UAAY,CAAA,CAAA;AACX,UAAA,GAAA,EAAA;MAAA,IAAG,CAAI,CAAC,CAAA,CAAA,UAAI,IAAC,CAAA,EAAL,OAAA,GAAS,CAAT,CAAA,IAAe,CAAA,CAAA,WAAI,IAAC,CAAA,EAAL,QAAA,GAAS,CAAT,CAAhB,CAAP;eACC,IAAC,CAAA,IAAD,CAAA,EADD;;IADW;;IAIZ,MAAQ,CAAA,CAAA;MACP,GAAG,CAAC,WAAJ,GAAkB,CAAA,KAAA,CAAA,CAAQ,IAAC,CAAA,CAAT,CAAW,CAAX,CAAA,CAAc,IAAC,CAAA,CAAf,CAAiB,CAAjB,CAAA,CAAoB,IAAC,CAAA,CAArB,CAAuB,EAAvB,CAAA,CAA2B,IAAC,CAAA,CAA5B,CAA8B,CAA9B;MAClB,GAAG,CAAC,SAAJ,GAAgB;MAChB,GAAG,CAAC,SAAJ,CAAA;MACA,GAAG,CAAC,MAAJ,CAAW,IAAC,CAAA,CAAZ,EAAe,IAAC,CAAA,CAAhB;MACA,GAAG,CAAC,MAAJ,CAAW,IAAC,CAAA,CAAD,GAAK,IAAC,CAAA,EAAjB,EAAqB,IAAC,CAAA,CAAD,GAAK,IAAC,CAAA,EAA3B;MACA,GAAG,CAAC,SAAJ,CAAA;aACA,GAAG,CAAC,MAAJ,CAAA;IAPO;;EAzCT,EAjBA;;;;;EAqEA,YAAA,GAAe,QAAA,CAAA,CAAA;IACd,MAAM,CAAC,KAAP,GAAe,MAAM,CAAC;IACtB,MAAM,CAAC,MAAP,GAAgB,MAAM,CAAC;IACvB,CAAA,GAAI,MAAM,CAAC;IACX,CAAA,GAAI,MAAM,CAAC;IACX,EAAA,GAAK,CAAA,GAAI;IACT,EAAA,GAAK,CAAA,GAAI;WACT,MAAM,CAAC,KAAP,GAAe,MAAM,CAAC;EAPR,EArEf;;;;EAgFA,MAAM,CAAC,MAAP,GAAgB,QAAA,CAAA,CAAA;AACf,QAAA,CAAA,EAAA,GAAA,EAAA;IAAA,MAAM,CAAC,gBAAP,CAAwB,QAAxB,EAAkC,YAAlC,EAAgD,KAAhD;IACA,YAAA,CAAA;IACA,KAAS,oFAAT;MACC,KAAK,CAAC,IAAN,CAAW,IAAI,IAAJ,CAAA,CAAX;IADD;WAEA,OAAA,CAAA;EALe;;EAOhB,OAAA,GAAU,QAAA,CAAA,CAAA;AACT,QAAA,KAAA,EAAA,CAAA,EAAA,GAAA,EAAA,CAAA,EAAA;IAAA,GAAG,CAAC,SAAJ,CAAc,CAAd,EAAiB,CAAjB,EAAoB,CAApB,EAAuB,CAAvB;IACA,EAAA,GAAK,IAAI,CAAC,GAAL,CAAA;IACL,KAAA,GAAQ,EAAA,GAAK;IACb,EAAA,GAAK;IACL,KAAS,oFAAT;MACC,KAAM,CAAA,CAAA,CAAE,CAAC,MAAT,CAAgB,KAAA,GAAQ,IAAxB;MACA,KAAM,CAAA,CAAA,CAAE,CAAC,UAAT,CAAA;MACA,KAAM,CAAA,CAAA,CAAE,CAAC,MAAT,CAAA;IAHD;WAIA,qBAAA,CAAsB,OAAtB;EATS;AAvFV","sourcesContent":["################ Globals ############################\n#####################################################\ntwigs = []\n############## Canvas Setup ##########################\n######################################################\ncanvas = document.querySelector \"#display\"\nctx = canvas.getContext \"2d\"\nw = canvas.width\nh = canvas.height\ncx = w / 2\ncy = h / 2\nt0 = Date.now()\ntwigCount = 1000\n\n\n############## Classes ###############################\n######################################################\nclass twig\n\tconstructor: () ->\n\t\t@init()\n\t\t@r = 55\n\t\t@g = 255\n\t\t@b = 118\n\t\t@dg = -1\n\t\t@db = 1\n\t\t@dr = 1\n\t\n\tinit: () ->\n\t\t@a = Math.random() * .4 + .1\n\t\t@theta = Math.random() * Math.PI * 2\n\t\t@dTheta = Math.random() * .005 + .002\n\t\t@x = cx\n\t\t@y = cy\n\t\t@mag = Math.random() * 15 + 5\n\t\t@dx = @mag*Math.cos(@theta)\n\t\t@dy =\t@mag*Math.sin(@theta)\n\t\n\tupdate: (m) ->\n\t\t@r += @dr\n\t\t@g -= @dg\n\t\t@b += @db\n\t\tif not(255 > @r > 0)\n\t\t\t@dr *= -1\n\t\tif not(255 > @g > 0)\n\t\t\t@dg *= -1\n\t\tif not(255 > @b > 0)\n\t\t\t@db *= -1\n\t\t@x += @dx * m\n\t\t@y += @dy * m\n\t\t@theta += @dTheta\n\t\t@dx = @mag*Math.cos(@theta)\n\t\t@dy =\t@mag*Math.sin(@theta)\n\t\t@dTheta += Math.random() * .0002 - .0001\n\t\t\n\tcheckWalls: () ->\n\t\tif not (0 < @x < w and 0 < @y < h)\n\t\t\t@init()\n\t\n\trender: () ->\n\t\tctx.strokeStyle = \"rgba(#{@r},#{@g},#{@b}, #{@a})\"\n\t\tctx.lineWidth = 5\n\t\tctx.beginPath()\n\t\tctx.moveTo(@x, @y)\n\t\tctx.lineTo(@x + @dx, @y + @dy)\n\t\tctx.closePath()\n\t\tctx.stroke()\n\t\t\n####################### Helpers #######################\n#######################################################\nresizeCanvas = () ->\n\tcanvas.width = window.innerWidth\n\tcanvas.height = window.innerHeight\n\tw = canvas.width\n\th = canvas.height\n\tcx = w / 2\n\tcy = h / 2\t\n\tcanvas.width = canvas.width\n\n#################### Main ############################\n#######################################################\nwindow.onload = () ->\n\twindow.addEventListener('resize', resizeCanvas, false)\n\tresizeCanvas()\n\tfor t in [0...twigCount]\n\t\ttwigs.push(new twig())\n\tanimate()\n\t\nanimate = () ->\n\tctx.clearRect(0, 0, w, h)\n\tt1 = Date.now()\n\tdelta = t1 - t0\n\tt0 = t1\n\tfor t in [0...twigCount]\n\t\ttwigs[t].update(delta / 1000)\n\t\ttwigs[t].checkWalls()\n\t\ttwigs[t].render()\n\trequestAnimationFrame(animate)\n\t"]}
//# sourceURL=coffeescript

Comments