Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <canvas id="canv"></canvas>
 <div class="sky">
  <div class="clouds">
    <div class="c1 one"></div>
    <div class="c1 two"></div>
    <div class="c1 three"></div>
    <div class="c1 four"></div>
    <div class="c2 one"></div>
    <div class="c2 two"></div>
    <div class="c2 three"></div>
    <div class="c2 four"></div>
  </div>
</div>
              
            
!

CSS

              
                body{
  width:100%;
  min-height:100%;
  margin:0;
  overflow:hidden;
}
canvas{
  z-index:99;
  position:absolute;
  top:0;
  left:0;
  bottom:0;
  right:0;
  background: linear-gradient(#B7B0E3, #FFD3D6);  
}


@keyframes anim {
  from {
    transform: translateX(200%);
  }
  to {
    transform: translateX(-200%);
  }
}

@keyframes anime {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-200%);
  }
}
.c1, .c2 {
  width: 800px;
  height: 700px;
  position: absolute;
  background: transparent url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/131045/clouds.png") 0 0 no-repeat;
  background-size: 100%;
  z-index:999;
}
.c1.one, .c2.one {
  top: -260px;
  left: 0px;
}
.c1.two, .c2.two {
  top: -200px;
  left: 100px;
}
.c1.three, .c2.three {
  top: -240px;
  right: 100px;
}
.c1.four, .c22.four {
  top: -180px;
  right: 0px;
}

.c2 .one {
  top: -209px;
}
@media (max-width: 1023px) {
  .c2.one {left: -80px;}
  .c2.two {left: -120px;}
  .c2.three {right: 220px;}
  .c2.four {right: 220px;}
}

.c1 {
  animation: anime 1000s linear infinite forwards;
}

.c2 {
  transform: translateX(200%);
  animation: anim 1000s linear infinite forwards;
}
              
            
!

JS

              
                var Bird = {
  def: function(n, m, s) {
    if (m) this.e(n.prototype, m);
    if (s) this.e(n, s);
    return n;
  },
  e: function(o, p) {
    for (prop in p) o[prop] = p[prop];
    return o;
  },
  v: [
    [5, 0, 0],
    [-5, -2, 1],
    [-5, 0, 0],
    [-5, -2, -1],
    [0, 2, -6],
    [0, 2, 6],
    [2, 0, 0],
    [-3, 0, 0]
  ],
  beak: [
    [0, 1, 2],
    [4, 7, 6],
    [5, 6, 7]
  ],
  L: null,
  V: {
    x: 0,
    y: 0,
    z: 5000
  }
}
Bird.obj = Bird.def(
  function() {
    this.vtr = new Bird.Vtr(),
      this.accel, this.width = 600, this.height = 600, this.depth = 300, this.ept, this.area = 200,
      this.msp = 4, this.mfrc = 0.1, this.coll = false;
    this.pos = new Bird.Vtr();
    this.vel = new Bird.Vtr();
    this.accel = new Bird.Vtr();
  }, {

    _coll: function(value) {
      this.coll = value;
    },
    param: function(w, h, dth) {
      this.width = w;
      this.height = h;
      this.depth = dth;
    },
    run: function(b) {
      if (this.coll) {
        this.vtr.set(-this.width, this.pos.y, this.pos.z);
        this.vtr = this.detect(this.vtr);
        this.vtr.scale(5);
        this.accel.add(this.vtr);
        this.vtr.set(this.width, this.pos.y, this.pos.z);
        this.vtr = this.detect(this.vtr);
        this.vtr.scale(5);
        this.accel.add(this.vtr);
        this.vtr.set(this.pos.x, -this.height, this.pos.z);
        this.vtr = this.detect(this.vtr);
        this.vtr.scale(5);
        this.accel.add(this.vtr);
        this.vtr.set(this.pos.x, this.height, this.pos.z);
        this.vtr = this.detect(this.vtr);
        this.vtr.scale(5);
        this.accel.add(this.vtr);
        this.vtr.set(this.pos.x, this.pos.y, -this.depth);
        this.vtr = this.detect(this.vtr);
        this.vtr.scale(5);
        this.accel.add(this.vtr);
        this.vtr.set(this.pos.x, this.pos.y, this.depth);
        this.vtr = this.detect(this.vtr);
        this.vtr.scale(5);
        this.accel.add(this.vtr);
      }
      if (Math.random() > 0.5) {
        this.fly(b);
      }
      this.move();
    },
    fly: function(b) {
      if (this.ept) {
        this.accel.add(this.meet(this.ept, 0.005));
      }
      this.accel.add(this.line(b));
      this.accel.add(this.togeth(b));
      this.accel.add(this.apart(b));
    },
    move: function() {
      this.vel.add(this.accel);
      var l = this.vel.len();
      if (l > this.msp) {
        this.vel.lowscale(l / this.msp);
      }
      this.pos.add(this.vel);
      this.accel.set(0, 0, 0);
    },
    detect: function(pt) {
      var dir = new Bird.Vtr();
      dir.copy(this.pos);
      dir.sub(pt);
      dir.scale(1 / this.pos.dsq(pt));
      return dir;
    },
    rep: function(pt) {
      var dist = this.pos.dst(pt);if (dist < 150) {
        var dir = new Bird.Vtr();
        dir.subv(this.pos, pt);
        dir.scale(0.5 / dist);
        this.accel.add(dir);
      }
    },
    meet: function(pt, amt) {
      var dir = new Bird.Vtr();
      dir.subv(pt, this.pos);
      dir.scale(amt);
      return dir;
    },
    line: function(b) {
      var _b, totvel = new Bird.Vtr(),
        cnt = 0;
      for (var i = 0, il = b.length; i < il; i++) {
        if (Math.random() > 0.6) continue;
        _b = b[i];
        var dist = _b.pos.dst(this.pos);
        if (dist > 0 && dist <= this.area) {
          totvel.add(_b.vel);
          cnt++;
        }
      }
      if (cnt > 0) {
        totvel.lowscale(cnt);
        var v = totvel.len();
        if (v > this.mfrc) {
          totvel.lowscale( v / this.mfrc);
        }
      }
      return totvel;
    },
    togeth: function(b) {
      var _b, dist,
        plus = new Bird.Vtr(),
        dir = new Bird.Vtr(),
        cnt = 0;
      for (var i = 0, il = b.length; i < il; i++) {
        if (Math.random() > 0.6) continue;
        _b = b[i];
        dist = _b.pos.dst(this.pos);
        if (dist > 0 && dist <= this.area) {
          plus.add(_b.pos);
          cnt++;
        }
      }
      if (cnt > 0) {
        plus.lowscale(cnt);
      }
      dir.subv(plus, this.pos);
      var l = dir.len();
      if (l > this.mfrc) {
        dir.lowscale(l / this.mfrc);
      }
      return dir;
    },
    apart: function(b) {
      var _b, dist,
        plus = new Bird.Vtr(),
        rep = new Bird.Vtr();
      for (var i = 0, il = b.length; i < il; i++) {
        if (Math.random() > 0.6) continue;
        _b = b[i];
        dist = _b.pos.dst(this.pos);
        if (dist > 0 && dist <= this.area) {
          rep.subv(this.pos, _b.pos);
          rep.level();
          rep.lowscale(dist);
          plus.add(rep);
        }
      }
      return plus;
    }
  }
);
Bird.Build = Bird.def(
  function() {
    this.base = 0, this.left = 1, this.right = 2;
    this.pos = new Bird.Vtr();
    this.rot = new Bird.Vtr();
    this.bbase = this.tri(this.base);
    this.leftwing = this.tri(this.left);
    this.rightwing = this.tri(this.right);
  }, {
    matrix: function() {
      this.bbase.vtx();
      this.leftwing.vtx();
      this.rightwing.vtx();
      this.leftwing.wingY(this.wY);
      this.rightwing.wingY(this.wY);
      this.bbase.rotY(this.rot.y);
      this.bbase.rotZ(this.rot.z);
      this.leftwing.rotY(this.rot.y);
      this.leftwing.rotZ(this.rot.z);
      this.rightwing.rotY(this.rot.y);
      this.rightwing.rotZ(this.rot.z);
      this.bbase.trans(this.pos);
      this.leftwing.trans(this.pos);
      this.rightwing.trans(this.pos);
    },
    draw: function() {
      this.bbase.draw();
      this.leftwing.draw();
      this.rightwing.draw();
    },
    tri: function(i) {
      var v1, v2, v3, v;
      v = Bird.v[Bird.beak[i][0]];
      v1 = new Bird.Vtr(v[0], v[1], v[2]);
      v = Bird.v[Bird.beak[i][1]];
      v2 = new Bird.Vtr(v[0], v[1], v[2]);
      v = Bird.v[Bird.beak[i][2]];
      v3 = new Bird.Vtr(v[0], v[1], v[2]);
      return new Bird.Tri(v1, v2, v3);
    },
    wang: function(y) {
      var v1 = Bird.v[Bird.beak[1][1]];
      this.rot.x = Math.atan2(y, v1[0]);
    },
    zpos: function() {
      var z1 = this.bbase._z();
      var z2 = this.leftwing._z();
      var z3 = this.rightwing._z();
      return Math.min(z1, z2, z3);
    },
    wing: function(y) {
      this.wY = y;
    }
  }
);
Bird.Tri = Bird.def(
  function(p1, p2, p3) {
    this.mainv = [p1.copy(), p2.copy(), p3.copy()];
    this.Vtxs = [p1.copy(), p2.copy(), p3.copy()];
    this.bv = new Bird.Vtr(0.5, 0.5, 0.8);
  }, {
    draw: function() {
      var v1 = [this.Vtxs[0].Pt().x, this.Vtxs[0].Pt().y];
      var v2 = [this.Vtxs[1].Pt().x, this.Vtxs[1].Pt().y];
      var v3 = [this.Vtxs[2].Pt().x, this.Vtxs[2].Pt().y];
      var col = this.col();
      Bird.$.fillStyle = col;
      Bird.$.strokeStyle = col;
      Bird.$.lineWidth = 0.1;
      Bird.$.beginPath();
      Bird.$.moveTo(v1[0], v1[1]);
      Bird.$.lineTo(v2[0], v2[1]);
      Bird.$.lineTo(v3[0], v3[1]);
      Bird.$.lineTo(v1[0], v1[1]);
      Bird.$.closePath();
      Bird.$.fill();
      Bird.$.stroke();
    },
    rotX: function(a) {
      var ang = a;
      this.Vtxs.forEach(
        function(e, i, a) {
          Bird.Matrix.rotX(e, ang);
        }
      );
    },
    rotY: function(a) {
      var ang = a;
      this.Vtxs.forEach(
        function(e, i, a) {
          Bird.Matrix.rotY(e, ang);
        }
      );
    },
    rotZ: function(a) {
      var ang = a;
      this.Vtxs.forEach(
        function(e, i, a) {
          Bird.Matrix.rotZ(e, ang);
        }
      );
    },
    trans: function(s) {
      var trans = s;
      this.Vtxs.forEach(
        function(e, i, a) {
          Bird.Matrix.trans(e, [trans.x, trans.y, trans.z]);
        }
      );
    },
    vtx: function(idx) {
      for (var i = 0; i < 3; i++) {
        var x = this.mainv[i].x;
        var y = this.mainv[i].y;
        var z = this.mainv[i].z;
        this.Vtxs[i].x = x;
        this.Vtxs[i].y = y;
        this.Vtxs[i].z = z;
      }
    },
    wingY: function(y) {
      this.Vtxs[0].y = y;
    },
    _z: function() {
      return Math.min(this.Vtxs[0].z, this.Vtxs[1].z, this.Vtxs[2].z);
    },
    col: function() {
      var e = 0.3,
          f = 0.3,
          g = 0.7;
      var bw = new Bird.Vtr(1, 1, 1);
      var n = this.norm();
      var x = this.Vtxs[0].copy();
      var v = x.sub(Bird.V);
      v.level();
      x = this.Vtxs[0].copy();
      var l = x.sub(Bird.L);
      l.level();
      var p = l.p(n);
      var x1 = n.copy();
      x1.scale(p);
      x1.scale(2);
      var r = l.copy();
      r.sub(x1);
      x1.scale(-1);
      p = Math.max(x1.p(l), 0);
      var col = this.bv.copy();
      col.scale(p);
      col.scale(col, e);
      x1 = col.copy();
      var x2 = r.copy();
      x2.scale(-1);
      p = Math.pow(Math.max(x2.p(v)), 20);
      x2 = bw.copy();
      x2.scale(p * f);
      var x3 = this.bv.copy();
      x3.scale(g);
      x1.add(x2);
      x1.add(x3);
      var _r = Math.floor(x1.x * 255);
      var _g = Math.floor(x1.y * 255);
      var _b = Math.floor(x1.z * 255);
      return 'rgb(' + _r + ',' + _g + ',' + _b + ')';
    },
    norm: function() {
      var v1 = this.Vtxs[0];
      var v2 = this.Vtxs[1];
      var v3 = this.Vtxs[2];
      v3.sub(v2);
      v1.sub(v3);
      v3.cross(v1);
      v3.level();
      return v3;
    }
  }
);
Bird.Vtr = Bird.def(
  function(x, y, z) {
    this.x = x || 0;
    this.y = y || 0;
    this.z = z || 0;
    this.fl = 1000;
  }, {
    Pt: function() {
      var zsc = this.fl + this.z;
      var scale = this.fl / zsc;
      var x = this.x * scale;
      var y = this.y * scale;
      return {
        x: x,
        y: y,
        scale: scale
      };
    },
    set: function(x, y, z) {
      this.x = x;
      this.y = y;
      this.z = z;
      return this;
    },
    len: function() {
      return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z);
    },
    add: function(v, w) {

      this.x += v.x;
      this.y += v.y;
      this.z += v.z;
      return this;
    },
    sub: function(v, w) {

      this.x -= v.x;
      this.y -= v.y;
      this.z -= v.z;
      return this;
    },
    subv: function(a, b) {
      this.x = a.x - b.x;
      this.y = a.y - b.y;
      this.z = a.z - b.z;
      return this;
    },
    scale: function(upd) {
      this.x *= upd;
      this.y *= upd;
      this.z *= upd;
      return this;
    },
    lowscale: function(upd) {
      if (upd !== 0) {
        var inv = 1 / upd;
        this.x *= inv;
        this.y *= inv;
        this.z *= inv;
      } else {
        this.x = 0;
        this.y = 0;
        this.z = 0;
      }
      return this;
    },
    copy: function(v) {
      this.x = v.x;
      this.y = v.y;
      this.z = v.z;
      return this;
    },
    dst: function(v) {
      return Math.sqrt(this.dsq(v));
    },
    dsq: function(v) {
      var dx = this.x - v.x;
      var dy = this.y - v.y;
      var dz = this.z - v.z;
      return dx * dx + dy * dy + dz * dz;
    },
    cross: function(v, w) {
      var x = this.x,
        y = this.y,
        z = this.z;
      this.x = y * v.z - z * v.y;
      this.y = z * v.x - x * v.z;
      this.z = x * v.y - y * v.x;
      return this;
    },
    p: function(v) {
      return this.x * v.x + this.y * v.y + this.z * v.z;
    },
    level: function() {
      return this.lowscale(this.len());
    },
    copy: function() {
      return new Bird.Vtr(this.x, this.y, this.z);
    }
  }
);
Bird.Matrix = {
  rotX: function(pt, angX) {
    var pos = [pt.x, pt.y, pt.z];
    var asin = Math.sin(angX);
    var acos = Math.cos(angX);
    var xrot = [];
    xrot[0] = [1, 0, 0];
    xrot[1] = [0, acos, asin];
    xrot[2] = [0, -asin, acos];
    var calc = this.mm(pos, xrot);
    pt.x = calc[0];
    pt.y = calc[1];
    pt.z = calc[2];
  },
  rotY: function(pt, angY) {
    var pos = [pt.x, pt.y, pt.z];
    var asin = Math.sin(angY);
    var acos = Math.cos(angY);
    var yrot = [];
    yrot[0] = [acos, 0, asin];
    yrot[1] = [0, 1, 0];
    yrot[2] = [-asin, 0, acos];
    var calc = this.mm(pos, yrot);
    pt.x = calc[0];
    pt.y = calc[1];
    pt.z = calc[2];
  },
  rotZ: function(pt, angZ) {
    var pos = [pt.x, pt.y, pt.z];
    var asin = Math.sin(angZ);
    var acos = Math.cos(angZ);
    var yrot = [];
    yrot[0] = [acos, asin, 0];
    yrot[1] = [-asin, acos, 0];
    yrot[2] = [0, 0, 1];
    var calc = this.mm(pos, yrot);
    pt.x = calc[0];
    pt.y = calc[1];
    pt.z = calc[2];
  },
  trans: function(pt, s) {
    pt.x += s[0];
    pt.y += s[1];
    pt.z += s[2];
  },
  scale: function(pt, s) {
    pt.x *= s[0];
    pt.y *= s[1];
    pt.z *= s[2];
  },
  mm: function(m1, m2) {
    var calc = [];
    calc[0] = m1[0] * m2[0][0] + m1[1] * m2[1][0] + m1[2] * m2[2][0];
    calc[1] = m1[0] * m2[0][1] + m1[1] * m2[1][1] + m1[2] * m2[2][1];
    calc[2] = m1[0] * m2[0][2] + m1[1] * m2[1][2] + m1[2] * m2[2][2];
    return calc;
  }
}

function draw() {
  var c = document.getElementById('canv');
  Bird.$ = c.getContext("2d");
  Bird.canv = {
    w: c.width = window.innerWidth,
    h: c.height = window.innerHeight
  };
  Bird.L = new Bird.Vtr(0, 2000, 5000);
  Bird.V = new Bird.Vtr(0, 0, 5000);
  var birds = [];
  var b = [];
  for (var i = 0; i < 100; i++) {
    _b = b[i] = new Bird.obj();
    _b.pos.x = Math.random() * 800 - 400;
    _b.pos.y = Math.random() * 800 - 400;
    _b.pos.z = Math.random() * 800 - 400;
    _b.vel.x = Math.random() * 2 - 1;
    _b.vel.y = Math.random() * 2 - 1;
    _b.vel.z = Math.random() * 2 - 1;
    _b._coll(true);
    _b.param(400, 400, 800);
    bird = birds[i] = new Bird.Build();
    bird.phase = Math.floor(Math.random() * 62.83);
    bird.pos = b[i].pos;
  }

  run();

  function run() {
    window.requestAnimationFrame(run);
    draw();
  }

  function draw() {
    Bird.$.setTransform(1, 0, 0, 1, 0, 0);
    Bird.$.translate(Bird.canv.w / 2, Bird.canv.h / 2);
    Bird.$.clearRect(-Bird.canv.w / 2, -Bird.canv.h / 2, Bird.canv.w, Bird.canv.h);
    Bird.$.scale(1, -1);
    var arr = [];
    b.forEach(function(e, i, a) {
      var _b = b[i];
      _b.run(b);
      var bird = birds[i];
      bird.rot.y = Math.atan2(-_b.vel.z, _b.vel.x);
      bird.rot.z = Math.asin(_b.vel.y / _b.vel.len());
      bird.phase = (bird.phase + (Math.max(0, bird.rot.z) + 0.1)) % 62.83;
      bird.wing(Math.sin(bird.phase) * 5);
      bird.matrix();
      arr.push({
        z: bird.zpos(),
        o: bird
      });
    });
    arr.sort(function(a, b) {
      return a.z < b.z ? -1 : a.z > b.z ? 1 : 0;
    });
    arr.forEach(function(e, i, a) {
      e.o.draw();
    });
  }
};
draw();
window.addEventListener('resize',function(){
   if(c.width!==window.innerWidth && c.height!==window.innerHeight){
     Bird.canv = {
      w: c.width = window.innerWidth,
      h: c.height = window.innerHeight
    };
   }
});
              
            
!
999px

Console