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comicify.html
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comicify.html
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<html>
<head><title>Comicify -- Make a phote look like a comic book drawing...</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript">
function comicify(c){
var _t = this;
_t.draw(c);
}
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;
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));
}
$(document).ready(function(){ var c = new comicify($('body'));});
</script>
</head>
<body>
<h1>Comicify</h1><h2>Make a photo look like a comic book drawing...</h2>
</body>
</html>