無数の色パネル

document.title = '無数の色パネル';

let { canvas, ctx, cx, cy, w, h, min, demo } = readyCanvas();

var style = document.createElement('style');
style.innerText = 'html,body{overflow:hidden;cursor:none;user-select:none;}';
document.getElementsByTagName('head').item(0).appendChild(style);

var hue = 90;


let styleImg = document.createElement('style');
styleImg.innerText = '#demo img{position:absolute;top:50%;left:50%;transform:translate(-50%, -50%);height:100vh;opacity:1;cursor:none;}';
document.getElementsByTagName('head').item(0).appendChild(styleImg);
let img = document.createElement('img');
demo.appendChild(img);
img.src = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw%3D%3D';

let search = location.search.slice(1);
let params = new URLSearchParams(search);
let q = params.get('q');
if(q){
  img.src = q;
}

var t = 0;
var imax = 128;

function draw() {
  w = canvas.width;
  h = canvas.height;
  ctx.clearRect(0, 0, w, h);
  var iw = w/imax;
  var ih = h/imax;
  for(i=0;i<imax;i++){
    for(j=0;j<imax;j++){
      var ch = Math.floor(Math.random()*360);
      //var r = Math.floor(Math.random()*128)+128;
      //var g = Math.floor(Math.random()*128)+128;
      //var b = Math.floor(Math.random()*128)+128;
      var color = 'hsl('+ch+',100%,50%)';
      //var color = 'rgb('+r+','+g+','+b+')';
      ctx.fillStyle = color;
      ctx.fillRect(i*iw, j*ih, iw, ih);
    }
  }
}
draw();
setInterval(function(){
  draw();
},9);





// ファイルアップロード
var dragArea = document.getElementById('demo');
dragArea.classList.add('ready');
dragArea.addEventListener('dragstart', function(event){
  event.dataTranfer.addElement(container);
});
dragArea.addEventListener('dragover', function(event){
  event.preventDefault();
  this.classList.add('drag');
});
dragArea.addEventListener('dragleave', function(event){
  event.preventDefault();
  this.classList.remove('drag');
});
dragArea.addEventListener('drop', function(event){
  event.preventDefault();
  this.classList.remove('drag');
  console.log(event.dataTransfer.files);
  if(!event.dataTransfer.files.length){
    return;
  }
  var file = event.dataTransfer.files[0];
  fileName = file.name.substring(0,12).split('.')[0] || 'name';
  console.log(file);

  var reader = new FileReader();
  reader.readAsDataURL(file)

  reader.addEventListener('load', function(){
    var dataURL = reader.result;
    console.log(dataURL);

    var newImage = new Image();
    img.src = dataURL;
    newImage.src = dataURL;
    newImage.onload = function(){
    }
  });
});


let opacity = 1;
img.addEventListener('click', function(ev) {
  opacity -= 0.2;
  if(opacity < 0.4){
    opacity = 1;
  }
  img.style.opacity = opacity;
}, false );



document.oncontextmenu = function () {return false;}

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view-source:https://hi0a.com/game/canvas-color-noize/