Comicify/comicifyOnClick.html at master · kapyaar/Comicify · GitHub

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<html>
<body>
	<!--Note: Since this code uses canvas, using images from other domains can throw an error about canvas getting tainted. There are some ways to get around it though-->
	<img src="https://rawgit.com/kapyaar/Comicify/master/catFromInternet.jpg" />
	<div id="resultHolder"></div>
	<p>It is possible the example may not work right away, due to image cross domain canvas contamination.</p>
	<button onclick="start()">Comicify me</button>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript">
function start() {
	var myImg=$("img");
	var myDistance=50;// This can be updated from an input field if needed.
	var f = function(myImg) {
        //do something with returned image
    };
    var c = new comicify(myImg, myDistance, 0);
};

function comicify(img, dist, outf) {
    var t = this;
    t.srcimg = img;
	t.distance = dist;
    t.outfun = outf;
    t.container = $("#resultHolder");
    t.process();


}

comicify.prototype={
          draw:function(container){
              var t = this;
              t.container = container;
              var input = $('<input>').val(t.distance).change(function(){
                  t.distance=this.value;
                  if(''!= t.srcimg[0].src){
                      t.process();
                  }
              });

              container.append($('<div>').text("Directions:").append(
                  $('<ul>')
                      .append($('<li>').text("Set the distance to distance (manitude between color vecotrs) that defines a single (new) color"))
                      .append($('<li>').text("Paste an image to the page"))
                      .append($('<li>').text("Wait -- you're processing an image in Javascript..."))
              ));
              container.append($('<div>').append($('<span>').text("Distance:").width("400px")).append(input))
              t.srcimg = $('<img>');
              t.srcimg.load(function(){t.process()});
              container.on('paste',function(evt){
                  return(t.handlePaste(evt));
              });
          },
          handlePaste : function  (evt) {
              var t = this;
              var items = evt.originalEvent.clipboardData.items, paste;
              for (var i in items){
                  if('file' ==items[i].kind){
                      var fr = new FileReader();
                      console.log("Going");
                      fr.onload = function(revt){
                          t.srcimg[0].src = revt.target.result;
                      }
                      fr.readAsDataURL(items[i].getAsFile());
                  }
              }
          },

          process:function(){
              var t = this;
              var canvas = $('<canvas>');
              var w = canvas[0].width = t.srcimg[0].width;
              var h = canvas[0].height= t.srcimg[0].height;
			  console.log(h);
              var prog = $('<span>').text("Processing...");
              t.container.append(prog);
              t.ctx = canvas[0].getContext('2d');
              t.ctx.drawImage(t.srcimg[0],0,0);
              t.image = t.ctx.getImageData(0,0,w,h);  //array [4*w*h] of colors RGBA
              t.ctx.clearRect ( 0 , 0 ,w,h);
              t.mask = Array(w);
              var zz = Array();
              for (var i =0;i<w*h;i++){
                  zz[i]=i;
              }
              for (var i =0;i<w;i++){
                  t.mask[i] = Array(h);
                  for(var j=0;j<h;j++){
                      t.mask[i][j]=true;
                      var n = Math.floor(w*h*Math.random());
                      var z = zz[n];
                      zz[n] = zz[i*j];
                      zz[i*j] =z;
                  }
              }

              var n =0;
              var err = "";
	      var step = (w*h)/100;
	      var progress = 0;
              var fn  = function(){
                  if (n<(w*h) && err == ""){
		      var q = Math.floor(step);
                      while  (q > 0 && n<(w*h) && err == ""){
                          var x = zz[n];
                          var j = Math.floor(x / w);
                          var i = x % w;

                          if(t.mask[i][j]) {
                              var y = x*4;
                              var avgct=0;
                              t.avg=[t.image.data[y++],t.image.data[y++],t.image.data[y++],t.image.data[y++]];
                              try {
                                  t.doPoint(i,j);   // do all the points next to it too...
                                  t.doPaint();
			      } catch(e){
				  if (! e.message == "Maximum call stack size exceeded") {
				      err = e.message;
				      prog.text(e.message);
				  } else{
				      t.doPaint();
				  } // ignore call stack (we'll try
                              }
                          }
                          n++;
                          q--;
                      }
		      progress ++;
		      if (err == ""){
			  prog.text("Processing " + String(progress) + "%");
			  window.setTimeout(fn,0.0001);
                      }
                  } else {
                      if (err == ""){
                          prog.remove();
                      }
                      t.ctx.putImageData(t.image,0,0);
                      var outImg = $('<img>');
                      outImg[0].src =canvas[0].toDataURL();
                      t.container.append(outImg);
                  }
              };
              window.setTimeout(fn,4);
          },
          doPaint:function(){
              var t= this;
              var w = t.srcimg[0].width;
              var h = t.srcimg[0].height;
              var avgct = 1;
              for (var i =0;i<w;i++){
                  for(var j=0;j<h;j++){
                      var x = 4*(i+(j*w));
                      if(null==t.mask[i][j]){
                          for (var k=0;k<4;k++) {
                              t.avg[k] = ((t.avg[k]*avgct) +t.image.data[x+k]) /(avgct +1);
                          }
                          avgct++;
                      }
                  }
              }
              for (var i =0;i<w;i++){
                  for(var j=0;j<h;j++){
                      if(null==t.mask[i][j]){
                          var n = 4*(i+(j*w));
                          for (var k=0;k<4;k++) {
                              t.image.data[n+k]  = Math.floor(t.avg[k]);
                          }
                          t.mask[i][j] = 0;
                      }
                  }
              }
          },

          doPoint:function(i,j){
              var t = this;
              var w = t.srcimg[0].width;
              var h = t.srcimg[0].height;
              var x = 4*(i+(j*w));
              var p = [t.image.data[x++],t.image.data[x++],t.image.data[x++],t.image.data[x++]]
              if (t.distance > distance(t.avg,p)){
                  t.mask[i][j] = null;
                  if( i+1 < w && t.mask[i+1][j] ) { t.doPoint(i+1,j)}
                  if( i-1 > 0 && t.mask[i-1][j] ) { t.doPoint(i-1,j)}
                  if( j+1 < h && t.mask[i][j+1] ) { t.doPoint(i,j+1)}
                  if( j-1 > 0 && t.mask[i][j-1] ) { t.doPoint(i,j-1)}
              }
              return;
          },
          avgPt:function(i,j,ct){
              var t = this;
              var w = t.srcimg[0].width;
              var h = t.srcimg[0].height;
              if(i>0 && j>0 && i<w && j<h){
                  var x = 4*(i+(j*w));
                  var p = [t.image.data[x++],t.image.data[x++],t.image.data[x++],t.image.data[x++]]
                  for (var k=0;k<4;k++) {
                      t.avg[k] = ((t.avg[k]*ct) +p[k]) /(ct +1);
                  }
              }
          },
          avgct:0,
          ctx:0,
          mask:0,
          image:0,
          avg:0,
          srcimg:0,
          cnv:0,
          distance : 35,
          container : 0  // container
      } // proto

      function distance(a,b){
          var o =0;
          for(i=0;i<4;i++){
              o += (a[i]-b[i])*(a[i]-b[i]);
          }
          return(Math.sqrt(o));
      }

</script>
</body>
</html>