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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="miku"></canvas>
<div class="control"><label>Volume:<input type="range" min="0" max="1" step="0.01" value="0.5" value="1" id="gain"></label></div>
            
          
!

CSS

            
              body {
  margin:0;
  padding:0;
  background:#000;
  user-select: none;
}
canvas {
  position: absolute;
  top: 0;
  left: 0;
}
.control {
  position: fixed;
  top: 0;
  right: 0;
  color: #fff;
  font-size: .8rem;
}

input {
  vertical-align: middle
}
            
          
!

JS

            
              function Rect() {
    this.initialize.apply(this, arguments);
}

Rect.prototype = {
  initialize: function(x, y) {
    this.x = x;
    this.y = y;
    this.key = this.method[Math.floor(Math.random()*this.method.length)];
    switch(this.key){
      case "triangle": this.a = (Math.random()*180); break;
      case "stroke": this.a = 2 * Math.PI * (Math.random()*360/360); break;
      default: return null;
    }
  },
  
  h : 0, //height
  a : 0, //angle
  t : 1, //transparency
  
  method:['stroke','stroke','triangle','square','circle'],
  
  rotate:function(ctx){
    ctx.translate(this.x, this.y);
    ctx.rotate(this.a * Math.PI / 180);
    ctx.translate(-this.x, -this.y);
  },
  
  triangle:function(ctx){
    var z = this.h / Math.sin(30 * (Math.PI/180));
    ctx.save();
    this.rotate(ctx);
    ctx.strokeStyle = 'rgba(0,255,204,'+this.t.toFixed(1)+')';
    ctx.beginPath();
    ctx.moveTo(this.x-z,this.y+this.h);//左下点
    ctx.lineTo(this.x,this.y-this.h*2);//上点
    ctx.lineTo(this.x+z,this.y+this.h);//右下点
    ctx.closePath();
    ctx.stroke();
    ctx.restore();
  },
  
  circle:function(ctx){
    ctx.save();
    ctx.strokeStyle = 'rgba(0,255,204,'+this.t.toFixed(1)+')';
    ctx.beginPath();
    ctx.arc(this.x,this.y,this.h,0,Math.PI*2,true);
    ctx.stroke();
    ctx.restore();
  },
  
  square:function(ctx){
    ctx.save();
    ctx.strokeStyle = 'rgba(0,255,204,'+this.t.toFixed(1)+')';
    this.rotate(ctx);
    ctx.strokeRect(this.x-this.h,this.y-this.h,this.h*2,this.h*2);
    ctx.restore();
  },
  
  stroke:function(ctx){
    ctx.save();
    c = ctx.canvas.width * Math.cos(this.a);
    s = ctx.canvas.width * Math.sin(this.a);
    ctx.strokeStyle = 'rgba(0,255,204,'+this.t.toFixed(1)+')';
    ctx.beginPath();
    ctx.moveTo(this.x+c, this.y-s);
    ctx.lineTo(this.x-c, this.y+s);
    ctx.stroke();
    ctx.restore();
  },
  
  update: function(){
    this.h += 15;
    if(this.key=="square") this.a += 5;
    if(this.t>0) this.t -= 0.03;
    else this.t=0;
    return this.h;
  },
  
  start: function(ctx){
    eval('this.'+this.key+'(ctx)');
  }
};



var Ano = function(){
  var ano = {
    
    canvas:null,
  audio:null,
    gain: null,
    context:null,
    array:[],
    active:false,
  tapbox:[],
  
  soundCode:[523,587,659,699,784,880,988,1047],
    
    addEvent:function(obj, type, fn){
      if (obj.addEventListener)
        obj.addEventListener( type, fn, false );
    },
    
    load:function(id){
      this.addEvent(window, 'load', function(event){
        
        ano.canvas = document.getElementById(id);
      
    ano.calcTapBox();
      
        if (ano.canvas.getContext){
          ano.setSize();
          ano.context = ano.canvas.getContext('2d');
          ano.context.strokeStyle = "#00ffcc";
          ano.context.lineWidth = 3;
          ano.addEvent(ano.canvas,"click",ano.clickhandler);

          window.addEventListener('resize', ano.setSize)
          window.setInterval( ano.onRender, 15);
        }
        
      },this);
    },
    
    onRender:function(){
      ano.context.clearRect(0,0,ano.canvas.width,ano.canvas.height);
      
      if(ano.array.length!==0){
        for (var i = 0 ; i != ano.array.length ; ++i ){
          if(ano.array[i].update()<1000){
            ano.array[i].start(ano.context);
          }else{
            ano.array.splice(i,1);
            return;
          }
        }
      }
    },
    
    setSize:function(){
        ano.canvas.height = window.innerHeight;
        ano.canvas.width = window.innerWidth;
    },
  
  //キー位置算出
  calcTapBox:function(){
    var w = window.innerWidth/4;
    var pos = [0];
    
    for(i=1; i < 4; i++){
      pos.push(Math.round(w*i));
    }
    ano.tapbox = pos;
  },
    
  //クリックでなんかする
    clickhandler:function(event) {
      if (!event) { event = window.event; }
      x = event.layerX;
      y = event.layerY;
    
    var key =  ano.keySearch(x);
    if(y >= (window.innerHeight/2)) key += 4;
    ano.soundPlay(ano.soundCode[key]);
    
      var obj = new Rect(x,y,ano.context,ano.canvas);
    
      ano.array.push(obj);
      ano.active = true;
    },
    
  /**
   * http://ascii.jp/elem/000/000/564/564098/
   * https://www.g200kg.com/jp/docs/webaudio/
   */
  soundPlay:function(freq){
    var sampleRate = 44100;   // 44.1kHz
    //var audio = new Audio();
    const audio = new AudioContext();
    const osc = new OscillatorNode(audio);
    const gain = new GainNode(audio);
    const gainVal = document.getElementById('gain').value;
    
    // if(typeof audio.mozSetup != "function"){
    //   return;
    // }
    
//     audio.mozSetup(1, sampleRate);  // 1ch, 44kHz
    
//     var bufferSize = sampleRate * 0.5;    // 1000ms
//     var data = new Float32Array(bufferSize);
//     var k = 2* Math.PI * freq / sampleRate;
//     for(var i=0; i<data.length; i++){
//       data[i] = Math.sin(k * i);
//     }
//     audio.mozWriteAudio(data);
//     audio.play();
    osc.frequency.value = freq;
    gain.gain.value = parseFloat(gainVal);
    osc.connect(gain).connect(audio.destination);
    osc.start();
    osc.stop(audio.currentTime + 0.5);
  },
  
  //押された場所のX座標チェック
  keySearch:function(x){
    
    for(i=0; i < ano.tapbox.length; i++){
      var next = (i==(ano.tapbox.length-1))? window.innerWidth:ano.tapbox[i+1]; 
      if((x > ano.tapbox[i]) && (x < next))
        return (i);
    }
  }
  
  };
  
  return ano;
};

var anog = new Ano();
anog.load('miku');

            
          
!
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