canvas分形时钟

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window.requestAnimFrame = (function() {
  return (
    window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.oRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function(callback) {
      window.setTimeout(callback);
    }
  );
});

function init(elemid) {
  let canvas = document.getElementById(elemid),
    c = canvas.getContext("2d"),
    w = (canvas.width = window.innerWidth),
    h = (canvas.height = window.innerHeight);
  c.fillStyle = "rgba(30,30,30,1)";
  c.fillRect(0, 0, w, h);
  return {c:c,canvas:canvas};
}

window.onload = function() {
let c = init("canvas").c,
    canvas = init("canvas").canvas,
  w = (canvas.width = window.innerWidth),
  h = (canvas.height = window.innerHeight),
  mouse = {x: w/2, y: h/2},
  last_mouse = {};
  
//initiation
  let date = new Date(),
      H = date.getHours()%12,
      M = date.getMinutes(),
      s = date.getSeconds(),
      m = date.getMilliseconds()/1000,
      htime = s+M*60+H*60*60+m,
      mtime = s+M*60+m,
      stime = s+m,
      mstime = m,
      hang = 2*Math.PI/(12*60*60/htime),
      mang = 2*Math.PI/(60*60/mtime),
      sang = 2*Math.PI/(60/stime),
      msang = 2*Math.PI/(1/mstime),
      tstring = ""+H+":"+M+":"+s,
      ch = 0,
      cM = 90,
      cs = 180,
      cms = 270,
      harr = [],
      sc = 10,
      maxit = 6,
      gr = 2/(1+Math.sqrt(5));
  
  function showdate(x,y,l,b,a,it,color,al){
    
    c.globalAlpha = al;
    c.beginPath();
    c.arc(x+l*Math.cos(a),y+l*Math.sin(a),b,0,2*Math.PI);
    c.fillStyle = color;
    c.fill();
    
    c.beginPath();
    c.lineTo(x,y);
    c.lineTo(x+l*Math.cos(a),y+l*Math.sin(a));
    c.strokeStyle = color;
    c.lineWidth=gr*b;
    c.stroke();
    c.lineCap="round";
    c.globalAlpha = 1;
    if(it < maxit){
      showdate(x+l*Math.cos(a),y+l*Math.sin(a),gr*l,gr*b,a+hang,it+1,"hsla("+ch+",100%,50%,"+(1-(it)*1/maxit)+")",al);
      showdate(x+l*Math.cos(a),y+l*Math.sin(a),gr*l,gr*b,a+mang,it+1,"hsla("+cM+",100%,50%,"+(1-(it)*1/maxit)+")",al);
      showdate(x+l*Math.cos(a),y+l*Math.sin(a),gr*l,gr*b,a+sang,it+1,"hsla("+cs+",100%,50%,"+(1-(it)*1/maxit)+")",al);
      //showdate(x+l*Math.cos(a),y+l*Math.sin(a),gr*l,gr*b,a+msang,it+1,"hsla("+cms+",100%,0%,"+(1-(it)*1/maxit)+")",gr*al);
    }
  }
  
  function updatedate(){
    date = new Date();
    H = date.getHours()%12;
    M = date.getMinutes();
    s = date.getSeconds();
    m = date.getMilliseconds()/1000;
    htime = s+M*60+H*60*60+m;
    mtime = s+M*60+m;
    stime = s+m;
    mstime = m;
    hang = 2*Math.PI/(12*60*60/htime);
    mang = 2*Math.PI/(60*60/mtime);
    sang = 2*Math.PI/(60/stime);
    msang = 2*Math.PI/(1/mstime);
    tstring = ""+H+":"+M+":"+s;
  }
  
  for(let i = 0; i < 60; i++){
    harr.push(i*2*Math.PI/60);
  }

function draw() {
  //animation
  
  c.beginPath();
  c.lineTo(w/2,h/2);
  c.lineTo(w/2+h/6*Math.cos(hang-Math.PI/2),h/2+h/6*Math.sin(hang-Math.PI/2));
  c.strokeStyle = "hsl("+ch+",100%,50%)";
  c.lineWidth=gr*sc;
  c.stroke();
  
  c.beginPath();
  c.lineTo(w/2,h/2);
  c.lineTo(w/2+h/6*Math.cos(mang-Math.PI/2),h/2+h/6*Math.sin(mang-Math.PI/2));
  c.strokeStyle = "hsl("+cM+",100%,50%)";
  c.lineWidth=gr*sc;
  c.stroke();
  
  c.beginPath();
  c.lineTo(w/2,h/2);
  c.lineTo(w/2+h/6*Math.cos(sang-Math.PI/2),h/2+h/6*Math.sin(sang-Math.PI/2));
  c.strokeStyle = "hsl("+cs+",100%,50%)";
  c.lineWidth=gr*sc;
  c.stroke();
  
  c.beginPath();
  c.arc(w/2+h/6*Math.cos(hang-Math.PI/2),h/2+h/6*Math.sin(hang-Math.PI/2),sc,0,2*Math.PI);
  c.fillStyle = "hsl("+ch+",100%,50%)";
  c.fill();
  
  c.beginPath();
  c.arc(w/2+h/6*Math.cos(mang-Math.PI/2),h/2+h/6*Math.sin(mang-Math.PI/2),sc,0,2*Math.PI);
  c.fillStyle = "hsl("+cM+",100%,50%)";
  c.fill();
  
  c.beginPath();
  c.arc(w/2+h/6*Math.cos(sang-Math.PI/2),h/2+h/6*Math.sin(sang-Math.PI/2),sc,0,2*Math.PI);
  c.fillStyle = "hsl("+cs+",100%,50%)";
  c.fill();
  
  c.beginPath();
  c.arc(w/2+h/6*Math.cos(msang-Math.PI/2),h/2+h/6*Math.sin(msang-Math.PI/2),sc,0,2*Math.PI);
  c.fillStyle = "hsl("+cms+",100%,0%)";
  c.fill();
  
  //showdate(w/2,h/2,h/6,sc,hang-Math.PI/2,0,"hsl("+ch+",100%,50%)",1);
  showdate(w/2,h/2,h/6,sc,mang-Math.PI/2,0,"hsl("+cM+",100%,50%)",1);
  showdate(w/2,h/2,h/6,sc,sang-Math.PI/2,0,"hsl("+cs+",100%,50%)",1);
  //showdate(w/2,h/2,h/6,sc,msang-Math.PI/2,0,"hsl("+cms+",100%,0%)",1);
  
  c.beginPath();
  c.arc(w/2,h/2,h/6,0,2*Math.PI);
  c.strokeStyle = "white";
  c.lineWidth=0.5;
  c.stroke();
  
   for(i = 0; i < 60; i++){
     c.beginPath();
     if(i%5 == 0){
      c.arc(w/2+h/6*Math.cos(harr[i]),h/2+h/6*Math.sin(harr[i]),4,0,2*Math.PI);
      c.fillStyle = "white";
      c.fill();
     }else{
      c.lineTo(w/2+(h/6-4)*Math.cos(harr[i]),h/2+(h/6-4)*Math.sin(harr[i]));
      c.lineTo(w/2+(h/6+4)*Math.cos(harr[i]),h/2+(h/6+4)*Math.sin(harr[i]));
      c.strokeStyle = "white";
      c.stroke();
     }
   }
  
  c.font="40px verdana";
  c.strokeStyle = "rgb(30,30,30)";
  c.lineWidth=10;
  c.textAlign = "center";
  
  c.fillStyle="hsl("+ch+",100%,50%)";
  c.strokeText(H,w/2-72-50,h-100);
  c.fillText(H,w/2-72-50,h-100);
  
  c.fillStyle="white";
  c.fillText(":",w/2-38-50,h-100);
  
  c.fillStyle="hsl("+cM+",100%,50%)";
  c.strokeText(M,w/2-2-50,h-100);
  c.fillText(M,w/2-2-50,h-100);
  
  c.fillStyle="white";
  c.fillText(":",w/2+32-50,h-100);
  
  c.fillStyle="hsl("+cs+",100%,50%)";
  c.strokeText(s,w/2+66-50,h-100);
  c.fillText(s,w/2+66-50,h-100);
  
  c.fillStyle="white";
  c.fillText(".",w/2+100-50,h-100);
  
  c.fillStyle="hsl("+cms+",100%,0%)";
  c.strokeText(m*1000,w/2+151-50,h-100);
  c.fillText(m*1000,w/2+151-50,h-100); 
  
  updatedate();
}

canvas.addEventListener(
  "mousemove",
  function(e) {
    last_mouse.x = mouse.x;
    last_mouse.y = mouse.y;

mouse.x = e.pageX - this.offsetLeft;
    mouse.y = e.pageY - this.offsetTop;
  },
  false
);

function loop() {
  window.requestAnimFrame(loop);
  c.clearRect(0, 0, w, h);
  draw();
}

window.addEventListener("resize", function() {
  (w = canvas.width = window.innerWidth),
  (h = canvas.height = window.innerHeight);
  loop();
});

loop();
setInterval(loop, 1000 / 1000);
}

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