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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <canvas id="canvas"></canvas>
              
            
!

CSS

              
                body {
  background-color: #222;
  overflow: hidden;
}
canvas {
  background: radial-gradient( farthest-corner circle at left bottom, #ffbf02, #ff7f01);
  margin: 0 auto;
}

              
            
!

JS

              
                const audioCtx = new (window.AudioContext || window.webkitAudioContext)();

const frecuencias = [4186.01, 3951.07, 3729.31, 3520.00, 3322.44, 3135.96, 2959.96, 2793.83, 2637.02, 2489.02, 2349.32, 2217.46, 2093.00, 1975.53, 1864.66, 1760.00, 1661.22, 1567.98, 1479.98, 1396.91, 1318.51, 1244.51, 1174.66, 1108.73, 1046.50, 987.767, 932.328, 880.000, 830.609, 783.991, 739.989, 698.456, 659.255, 622.254, 587.330, 554.365, 523.251, 493.883, 466.164, 440.000, 415.305, 391.995, 369.994, 349.228, 329.628, 311.127, 293.665, 277.183, 261.626, 246.942, 233.082, 220.000, 207.652, 195.998, 184.997, 174.614, 164.814, 155.563, 146.832, 138.591, 130.813, 123.471, 116.541, 110.000, 103.826, 97.9989, 92.4986, 87.3071, 82.4069, 77.7817, 73.4162, 69.2957, 65.4064, 61.7354, 58.2705, 55.0000, 51.9130, 48.9995, 46.2493, 43.6536, 41.2035, 38.8909, 36.7081, 34.6479];
const symbols = ['\u2669','\u266a',' \u266b','\u266c'];

const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
let cw = canvas.width = window.innerWidth,
  cx = cw / 2;
let ch = canvas.height = window.innerHeight,
  cy = ch / 2;

let w = cw/12;
let h = ch/7;

let requestId = null;
const rad = Math.PI / 180;

const rects = [];
const notes = [];
const particles = [];

class Rect{
  constructor(x,y,freq){
    this.w = cw/12;
    this.h = ch/7;
    this.x = x;
    this.y = y;
    // audio
    this.stop = true;
    this.frequency = freq;// la frecuencia
    this.waveform = "triangle";// la forma de onda
    this.dur = .75;// la duración en segundos
    this.initialGain = .15;
  }
  
  play(){
   // crea un nuevo oscillator
   this.oscillator = audioCtx.createOscillator();
   // crea un nuevo nodo de ganancia 
   this.gain = audioCtx.createGain();
   // establece el valor inicial del volumen del sonido 
   this.gain.gain.value = this.initialGain;
   // establece el tipo de oscillator  
   this.oscillator.type = this.waveform;
   // y el valor de la frecuencia 
   this.oscillator.frequency.value = this.frequency;
   // el volumen del sonido baja exponencialmente     
   this.gain.gain.exponentialRampToValueAtTime(0.01, audioCtx.currentTime + this.dur);
   // conecta el oscillator con el nodo de ganancia 
   this.oscillator.connect(this.gain);
   // y la ganancia con el dispositivo de destino
   this.gain.connect(audioCtx.destination);
   // inicia el oscillator 
   this.oscillator.start(audioCtx.currentTime);
   this.stop = false;
   // para el oscillator después de un tiempo (this.dur) 
   this.oscillator.stop(audioCtx.currentTime + this.dur); 
   this.oscillator.onended = ()=>this.stop = true;
  }  
  
  update(cw,ch){
    this.w = cw/12;
    this.h = ch/7;
  }
  
  isPointInPath(m){
    let x = this.x*this.w;
    let y = this.y*this.h;
    ctx.beginPath();
    ctx.rect(x,y,this.w,this.h);
    if (ctx.isPointInPath(m.x, m.y) & this.stop){this.play()}
  }
}

for(let y = 0; y < 7; y++){
  for(let x = 0; x < 12; x++){
    let freq = frecuencias[rects.length];
    let r = new Rect(x,y,freq);
    
    rects.push(r);
  }
}

class Particle{
  constructor(){
  this.r = 50 + Math.random()*100;
  this.x = this.r + Math.random() * (cw - this.r);
  this.y = Math.random() * ch;
  this.speed = .5 + Math.random()*2;
  }
  draw(){
    ctx.beginPath();
    ctx.arc(this.x, this.y,this.r,0,2*Math.PI);
    ctx.fillStyle = grd();
    ctx.fill();
  }
  update(){
    if(this.y < -this.r){
      this.y = ch + this.r;
      this.x = this.r + Math.random() * (cw - this.r);
    }
    this.y -= this.speed;
  }
}

for(let i = 0;i < 20; i++){
  let p = new Particle();
  particles.push(p)
}

class Note{
  constructor(m){
    this.text = symbols[~~(Math.random()*symbols.length)];
    this.x = m.x;
    this.y = m.y;
    this.fontSize = 10+ ~~(Math.random()*40);
    this.alp = 1;
    this.speed = Math.random() +.5;
    this.frames = Math.random()*360;
    this.angle = Math.sin(frames*rad) * Math.PI/2;//Math.random()*2*Math.PI;
  }
  
  draw(){
    ctx.save(); 
    ctx.translate(this.x,this.y); 
    ctx.rotate(this.angle);
    ctx.font = this.fontSize+"px Verdana";
    ctx.textAlign="center";
    ctx.textBaseline="middle";
    ctx.fillStyle = `rgba(0, 0, 0, ${this.alp})`;
    ctx.fillText(this.text,0,0);
    ctx.restore();
  }
  
  update(){
    this.frames ++;
    this.fontSize +=.1;
    this.alp -=.01;
    this.angle = Math.sin(this.frames*rad) * Math.PI/2;
    this.y -= this.speed;
    this.x += Math.sin(this.frames*rad);   
  }
}

function Draw() {
requestId = window.requestAnimationFrame(Draw);
ctx.clearRect(0,0,cw,ch);
particles.map((p) => {
    p.update();
    p.draw();
}); 
notes.map((n,index) => {
     n.update();
     n.draw();
     if(n.alp <=0){notes.splice(index, 1);}
   });
}


function Init() {
	if (requestId) {
		window.cancelAnimationFrame(requestId);
		requestId = null;
}


cw = canvas.width = window.innerWidth,w = cw/12;
ch = canvas.height = window.innerHeight,h = ch/7;
rects.map((r) => r.update(cw,ch));
particles.map((p) => p.update());
Draw();
};

setTimeout(function() {
		Init();
		window.addEventListener('resize', Init, false);
}, 15);

canvas.addEventListener("mousemove",function(evt){
  let m = oMousePos(canvas, evt);
  rects.map((r) => r.isPointInPath(m));//sound
  
  if(Math.random() < .4){//notes
  let note = new Note(m);
  notes.push(note);}
});

function grd(){
  let grd = ctx.createLinearGradient(0, 0, canvas.width, 0);
  grd.addColorStop(0,"#ff8701");
	grd.addColorStop(1,"#ffac02");
  return grd;
}


function oMousePos(canvas, evt) {
  var ClientRect = canvas.getBoundingClientRect();
  return { //objeto
    x: Math.round(evt.clientX - ClientRect.left),
    y: Math.round(evt.clientY - ClientRect.top)
  }
}// JavaScript Document
              
            
!
999px

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