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              <!-- 
 Click and hold! :)
-->

<div class="background"></div>
<div class="progress"></div>
<canvas></canvas>

<footer>
 Made by <a href="https://twitter.com/cvaneenige" target="_blank">Colin</a> & <a class="footer-anchor" target="_blank" href="https://twitter.com/jorisvanr">Joris</a>
</footer>
            
          
!
            
              html,
body {
 width: 100%;
 height: 100%;
 margin: 0;
 overflow: hidden;
}

canvas {
 image-rendering: pixelated;
 position: relative;
 width: 100%;
 height: 100%;
 cursor: pointer
}

.background {
 background: linear-gradient(black, #1e88e5);
 height: 400vh;
 position: fixed;
 width: 100%;
 height: 800%;
 top: 0;
 left: 0;
 transform: translate3d(0, -75%, 0);
}

.progress {
 width: 100%;
 position: fixed;
 bottom: 0;
 left: 0;
 height: 2px;
 background: #99ccff;
 transform: translate3d(-100%, 0, 0);
}

* {
 user-select: none;
 -webkit-tap-highlight-color: transparent;
}

footer {
 position: fixed;
 right: 0;
 bottom: 0;
 left: 0;
 padding: 10px 10px;
 text-align: right;
 font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
 font-size: 14px;
 
  color: #FFF;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
 display: inline-block;
 margin-left: 2px;
 padding: 2px 4px;
 color: rgba(52, 52, 54, 1.0);
 text-decoration: none;
 background-color: #fcd000;
 border-radius: 4px;
 opacity: 1;
 transition: opacity 0.2s;
 
 &:hover {
  opacity: 0.6;
 }
}

            
          
!
            
              const json = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/304639/rocket.json";

const canvas = document.querySelector("canvas");
const background = document.querySelector(".background");
const bar = document.querySelector(".progress");

const initialize = vertices => {
 const geometry = createGeometry(0.002);
 const multiplier = vertices.length / 3;
 const attributes = [
  {
   name: "aPositionStart",
   data: i => [vertices[i].x, vertices[i].y, vertices[i].z + 0.1]
  },
  {
   name: "aControlPointOne",
   data: i => [vertices[i].x, vertices[i].y - 2, vertices[i].z]
  },
  {
   name: "aControlPointTwo",
   data: i => [vertices[i].x, vertices[i].y + 6, vertices[i].z]
  },
  {
   name: "aPositionEnd",
   data: () => [getRandom(3), getRandom(3), getRandom(2)]
  }
 ];

 const uniforms = [
  {
   name: "uProgress",
   type: "float",
   value: 0.0
  }
 ];

 const vertexShader = `
    attribute vec3 position;
    attribute vec3 aPositionStart;
    attribute vec3 aControlPointOne;
    attribute vec3 aControlPointTwo;
    attribute vec3 aPositionEnd;

    uniform float uProgress;
    uniform mat4 uMVP;

    vec3 bezier4(vec3 a, vec3 b, vec3 c, vec3 d, float t) {
      return mix(mix(mix(a, b, t), mix(b, c, t), t), mix(mix(b, c, t), mix(c, d, t), t), t);
    }

    float easeInOutQuint(float t){
      return t < 0.5 ? 16.0 * t * t * t * t * t : 1.0 + 16.0 * (--t) * t * t * t * t;
    }

    void main () {
      vec3 newPosition = bezier4(aPositionStart, aControlPointOne, aControlPointTwo, aPositionEnd, easeInOutQuint(uProgress));
      gl_Position = uMVP * vec4(newPosition + position, 1.0);
    }
  `;

 const fragmentShader = `
    precision mediump float;

    void main() {
      gl_FragColor = vec4(0.6, 0.8, 1.0, 1.0);
    }
  `;

 const baseRotation = 0.05;
 let rotation = baseRotation;

 const hold = new Hold({
  element: canvas,
  duration: 3,
  onProgress: progress => {
   uniforms[0].value = progress;
   if (progress < 0.6) {
    rotation = baseRotation + progress * 0.4;
   } else {
    rotation = 0.01;
   }
   background.style.transform = `translate3d(0, -${75 - 75 * progress}%, 0)`;
   bar.style.transform = `translate3d(${-100 + 100 * progress}%, 0, 0)`;
  }
 });

 const onRepeat = () => {
  rotateY(uniforms[uniforms.length - 1].value, rotation);
 };

 starlings(
  canvas,
  geometry,
  multiplier,
  attributes,
  uniforms,
  vertexShader,
  fragmentShader,
  () => {},
  onRepeat
 );
};

const getRandom = value => Math.random() * value - value / 2;

const loadJSON = callback => {
 const xhr = new XMLHttpRequest();
 xhr.overrideMimeType("application/json");
 xhr.open("GET", json, true);
 xhr.onreadystatechange = () => {
  if (xhr.readyState == 4 && xhr.status == "200") {
   callback(xhr.responseText);
  }
 };
 xhr.send(null);
};

const rotateY = (matrix, angle) => {
 const sin = Math.sin(angle);
 const cos = Math.cos(angle);
 const clone = JSON.parse(JSON.stringify(matrix));

 matrix[0] = clone[0] * cos - clone[8] * sin;
 matrix[1] = clone[1] * cos - clone[9] * sin;
 matrix[2] = clone[2] * cos - clone[10] * sin;
 matrix[3] = clone[3] * cos - clone[11] * sin;
 matrix[8] = clone[0] * sin + clone[8] * cos;
 matrix[9] = clone[1] * sin + clone[9] * cos;
 matrix[10] = clone[2] * sin + clone[10] * cos;
 matrix[11] = clone[3] * sin + clone[11] * cos;
};

const createGeometry = size => [
 { x: -size, y: -size, z: size },
 { x: size, y: size, z: size },
 { x: -size, y: size, z: -size },
 { x: size, y: -size, z: -size },
 { x: -size, y: size, z: -size },
 { x: size, y: size, z: size },
 { x: size, y: -size, z: -size },
 { x: size, y: size, z: size },
 { x: -size, y: -size, z: size },
 { x: size, y: -size, z: -size },
 { x: -size, y: -size, z: size },
 { x: -size, y: size, z: -size }
];

class Hold {
 constructor(props) {
  this.element = props.element || window;
  this.begin = props.begin || 0;
  this.end = props.end || 1;
  this.duration = props.duration || 1;
  this.intervalDuration = props.intervalDuration || 8;
  this.loop = props.loop || false;
  this.reset = props.reset || false;
  this.onProgress = props.onProgress || false;
  this.onComplete = props.onComplete || false;

  this.step =
   (this.end - this.begin) / (this.duration * 1000 / this.intervalDuration);
  this.current = this.begin;
  this.state = "hold";

  this.element.addEventListener("mousedown", this.onHold.bind(this), false);
  this.element.addEventListener("touchstart", this.onHold.bind(this), false);
  this.element.addEventListener("mouseup", this.onRelease.bind(this), false);
  this.element.addEventListener("touchend", this.onRelease.bind(this), false);
 }

 onHold() {
  this.state = "hold";
  if (this.interval) clearInterval(this.interval);
  this.interval = setInterval(this.onStep.bind(this), this.intervalDuration);
 }

 onStep() {
  this.current += this.state === "hold" ? this.step : -this.step;

  if (this.current < this.begin) {
   this.current = this.begin;
   clearInterval(this.interval);
   this.onProgress(this.current);
   return;
  }

  if (this.current > this.end) {
   if (this.loop) {
    this.current = this.begin;
   } else {
    this.current = this.end;
   }
   if (this.onComplete !== false) {
    clearInterval(this.interval);
    this.onProgress(this.current);
    this.onComplete();
    return;
   }
  }
  this.onProgress(this.current);
 }

 onRelease() {
  if (this.reset) {
   this.current = this.begin;
   clearInterval(this.interval);
   this.onProgress(this.current);
   return;
  }
  this.state = "release";
 }
}

loadJSON(vertices => {
 initialize(JSON.parse(vertices));
});

            
          
!
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