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// original by http://lach.la
var pixelSize = 2;
var blockSize = (3*pixelSize);
var image;
var has_image = false;
var has_canvas = false;
var qr, controls
function halftoneQR(QRBytes, controlBytes, image) {
var canvas = $('#output').get(0);
var ctx = canvas.getContext('2d');
drawPixel();
ctx.fillStyle = '#fff'
ctx.fillRect(0, 0, canvas.width, canvas.height);
var canvasThreshold = $('#imageThreshold').get(0);
var ctxThreshold = canvasThreshold.getContext('2d');
ctx.drawImage(canvasThreshold, 0, 0, canvas.width, canvas.height);
for (var byteRow = 0; byteRow < QRBytes.length; byteRow++) {
for (var byteCell = 0; byteCell < QRBytes[byteRow].length; byteCell++) {
/*
if (background === 'noise') {
// Draw random bytes
ctx.fillStyle = 'black';
for (var subRow = 0; subRow < 3; subRow++) {
for (var subCell = 0; subCell < 3; subCell++) {
ctx.fillStyle = 'black';
if (Math.random() < 0.5) {
ctx.fillStyle = 'white';
}
ctx.fillRect(byteRow * blockSize + (subRow * pixelSize), byteCell * blockSize + (subCell * pixelSize), pixelSize, pixelSize);
}
}
}
*/
// Middle Cell
ctx.fillStyle = QRBytes[byteRow][byteCell] ? 'black' : 'white';
ctx.fillRect(byteRow * blockSize + pixelSize, byteCell * blockSize + pixelSize, pixelSize, pixelSize);
}
}
// Re-draw control bytes
for (var byteRow = 0; byteRow < controlBytes.length; byteRow++) {
for (var byteCell = 0; byteCell < controlBytes[byteRow].length; byteCell++) {
if (controlBytes[byteRow][byteCell] !== null) {
if (controlBytes[byteRow][byteCell] === true) {
ctx.fillStyle = 'black';
} else {
ctx.fillStyle = 'white';
}
ctx.fillRect(byteRow * blockSize, byteCell * blockSize, blockSize, blockSize);
}
};
};
$('#download').attr('href', $('#output').get(0).toDataURL());
}
function drawImage() {
var canvasColour = $('#imageColour').get(0);
var ctxColour = canvasColour.getContext('2d');
ctxColour.clearRect(0,0,canvasColour.width, canvasColour.height);
ctxColour.drawImage(image, 0, 0, canvasColour.width, canvasColour.height);
console.log('hi')
drawPixel();
}
function drawPixel() {
var canvasColour = $('#imageColour').get(0);
var canvasPixel = $('#imagePixel').get(0);
var ctxPixel = canvasPixel.getContext('2d');
var canvasTemp = document.createElement('canvas');
canvasTemp.width = canvasTemp.height = (canvasPixel.width / pixelSize);
var ctxTemp = canvasTemp.getContext('2d');
ctxPixel.imageSmoothingEnabled =
ctxPixel.mozImageSmoothingEnabled =
ctxPixel.msImageSmoothingEnabled =
ctxPixel.webkitImageSmoothingEnabled =
ctxTemp.imageSmoothingEnabled =
ctxTemp.mozImageSmoothingEnabled =
ctxTemp.msImageSmoothingEnabled =
ctxTemp.webkitImageSmoothingEnabled = false;
ctxTemp.drawImage(canvasColour, 0, 0, canvasTemp.width, canvasTemp.height);
ctxPixel.drawImage(canvasTemp, 0, 0, canvasPixel.width, canvasPixel.height);
drawThreshold();
}
function drawThreshold() {
var canvasPixel = $('#imagePixel').get(0);
var ctxPixel = canvasPixel.getContext('2d');
var canvasThreshold = $('#imageThreshold').get(0);
var ctxThreshold = canvasThreshold.getContext('2d');
var pixels = ctxPixel.getImageData(0,0,canvasPixel.width,canvasPixel.height);
var d = pixels.data;
var width = Math.sqrt(d.length / 4) / pixelSize;
for (var i=0; i<d.length; i+=4) {
var r = d[i];
var g = d[i+1];
var b = d[i+2];
var grey = (r * 0.2126 + g * 0.7152 + b * 0.0722);
//var v = (grey >= 127) ? 255 : 0;
//d[i] = d[i+1] = d[i+2] = v;
d[i] = d[i+1] = d[i+2] = grey;
}
for (var i=0; i<d.length; i+=4) {
var grey = d[i];
var v = (grey >= 127) ? 255 : 0;
// Dithering
var error = (grey - v) / 8;
var i2 = i / 4;
var row = Math.floor(i2 / width);
var cell = i2 % width;
d[i] = d[i+1] = d[i+2] = v;
d[(((row + 0) * width) + (cell + 1)) * 4] = d[(((row + 0) * width) + (cell + 1)) * 4 + 1] = d[(((row + 0) * width) + (cell + 1)) * 4 + 2] = d[(((row + 0) * width) + (cell + 1)) * 4] + error;
d[(((row + 0) * width) + (cell + 2)) * 4] = d[(((row + 0) * width) + (cell + 2)) * 4 + 1] = d[(((row + 0) * width) + (cell + 2)) * 4 + 2] = d[(((row + 0) * width) + (cell + 2)) * 4] + error;
d[(((row + 1) * width) + (cell - 1)) * 4] = d[(((row + 1) * width) + (cell - 1)) * 4 + 1] = d[(((row + 1) * width) + (cell - 1)) * 4 + 2] = d[(((row + 1) * width) + (cell - 1)) * 4] + error;
d[(((row + 1) * width) + (cell + 0)) * 4] = d[(((row + 1) * width) + (cell + 0)) * 4 + 1] = d[(((row + 1) * width) + (cell + 0)) * 4 + 2] = d[(((row + 1) * width) + (cell + 0)) * 4] + error;
d[(((row + 1) * width) + (cell + 1)) * 4] = d[(((row + 1) * width) + (cell + 1)) * 4 + 1] = d[(((row + 1) * width) + (cell + 1)) * 4 + 2] = d[(((row + 1) * width) + (cell + 1)) * 4] + error;
d[(((row + 2) * width) + (cell + 0)) * 4] = d[(((row + 2) * width) + (cell + 0)) * 4 + 1] = d[(((row + 2) * width) + (cell + 0)) * 4 + 2] = d[(((row + 2) * width) + (cell + 0)) * 4] + error;
}
ctxThreshold.putImageData(pixels, 0, 0);
}
function generate() {
var text = $('#input').val() || "http://asdf.us/";
var errorLevel = 'H';
var sizes = {
L: [152, 272, 440, 640, 864, 1088, 1248, 1552, 1856, 1240],
M: [128, 224, 352, 512, 688, 864, 992, 700, 700, 524],
Q: [104, 176, 272, 384, 286, 608, 508, 376, 608, 434],
H: [72, 128, 208, 288, 214, 480, 164, 296, 464, 346]
};
var userSize = parseInt($('#size').val());
var QRsize = -1;
if (userSize === 0) {
for (var i = 0; i < sizes[errorLevel].length; i++) {
if (text.length < sizes[errorLevel][i]) {
QRsize = i + 1;
break;
}
};
} else {
if (text.length < sizes[errorLevel][userSize - 1]) {
QRsize = userSize;
}
}
if (QRsize == -1) {
if (userSize === 0) {
if (errorLevel === 'H') {
alert('Too much text.');
} else {
alert('Too much text. Try decreasing the error level.');
}
} else {
alert('Too much text. Try decreasing the error level or increasing the size.');
}
return;
}
qr = qrcode(QRsize, errorLevel);
qr.addData(text);
qr.make();
controls = qrcode(QRsize, errorLevel);
controls.addData(text);
controls.make(true);
}
function render(){
halftoneQR(qr.returnByteArray(), controls.returnByteArray());
}
$("#file_upload").on('change', function(e){
e.preventDefault();
var files = e.originalEvent.dataTransfer ? e.originalEvent.dataTransfer.files : e.originalEvent.target.files;
var file = files[0];
var reader = new FileReader();
reader.onload = function(event) {
//event.target.result;
var imageColour = new Image();
imageColour.onload = function() {
has_image = true;
image = this;
drawImage()
render()
}
imageColour.src = event.target.result;
};
reader.readAsDataURL(file);
return false;
})
$("#input").on('input', function(){
generate()
if ($("#size").val() === 'auto') {
resize()
}
render()
})
$("#error_level").on('change', function(){
generate()
render()
})
$("#size").on('change', function(){
generate()
resize()
render()
})
function resize(){
var canvas = $('#output').get(0);
canvas.width = canvas.height = qr.returnByteArray().length * (3*pixelSize);
var ctx = canvas.getContext('2d');
$('#imageColour, #imageThreshold, #imagePixel').attr({
width: canvas.width,
height: canvas.height
})
}
$(function() {
generate()
resize()
render()
})
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