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CodePen Accueil Étoiles et vitesse de distorsion

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CSS

html,body{height:100%;max-width:100%;margin:0;overflow:hidden;background:rgba(0,10,20,1) url(https://i.imgur.com/r838U7u.jpg) center no-repeat;background-size:cover;image-rendering: pixelated; font-family:sans-serif}
#space{width:100%}
#warp{position:absolute;z-index:9;bottom:0;left:0;right:0;margin:20px auto;color:rgba(209, 255, 255,1);border:2px solid;padding:1em;width:10em;text-align:center;font-weight:700;font-size:1.2em;display:inline-block;text-decoration:none;background:rgba(0,0,0,0.8);
transition:all 0.2s}
#warp:hover{
    box-shadow: 0 0 10px #eef, 0 0 12px #a0cdff inset;
    text-shadow: 0 0 12px #489cfa, 0 0 5px #fff;
}

/* follow me @nodws */
#btn-twtr{
  clear:both;
  color:#fff;
  border:2px solid;
  border-radius:3px;
  text-align:center;
  text-decoration:none;
  display:block;
  font-family:sans-serif;
  font-size:14px;
  width:13em;
  padding:5px 10px;
  font-weight:600;
  position:absolute;
  top:0;
  right:10%;
  margin:90vh 0;
  background:rgba(0,0,0,0.2);
  box-shadow:0 0 0px 3px rgba(0,0,0,0.2);
  opacity:0.3
}#btn-twtr:hover{color:#fff;opacity:1}

JS

//based on an Example by @curran
window.requestAnimFrame = (function(){   return  window.requestAnimationFrame})();
var canvas = document.getElementById("space");
var c = canvas.getContext("2d");

var numStars = 1900;
var radius = '0.'+Math.floor(Math.random() * 9) + 1  ;
var focalLength = canvas.width *2;
var warp = 0;
var centerX, centerY;

var stars = [], star;
var i;

var animate = true;

initializeStars();

function executeFrame(){
  
  if(animate)
    requestAnimFrame(executeFrame);
  moveStars();
  drawStars();
}

function moveStars(){
  for(i = 0; i < numStars; i++){
    star = stars[i];
    star.z--;
    
    if(star.z <= 0){
      star.z = canvas.width;
    }
  }
}

document.getElementById('warp').addEventListener("click",function(e){
 window.warp = window.warp==1 ? 0 : 1;
window.c.clearRect(0, 0, window.canvas.width, window.canvas.height);
executeFrame();
});

executeFrame();

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