cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External CSS

These stylesheets will be added in this order and before the code you write in the CSS editor. You can also add another Pen here, and it will pull the CSS from it. Try typing "font" or "ribbon" below.

Quick-add: + add another resource

Add External JavaScript

These scripts will run in this order and before the code in the JavaScript editor. You can also link to another Pen here, and it will run the JavaScript from it. Also try typing the name of any popular library.

Quick-add: + add another resource

Code Indentation

     

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.

            
              <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>
            
          
!
            
              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;
}
            
          
!
            
              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
Close

Asset uploading is a PRO feature.

As a PRO member, you can drag-and-drop upload files here to use as resources. Images, Libraries, JSON data... anything you want. You can even edit them anytime, like any other code on CodePen.

Go PRO

Loading ..................

Console