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var url = 'https://lh6.googleusercontent.com/-NQAMokukfdE/AAAAAAAAAAI/AAAAAAAAAAA/zSaLZajdgEI/s48-c-k-no/photo.jpg'; | |
var xoffset = 240; | |
var yoffset = 210; | |
var pixelSize = 7; | |
var viewportWidth = 800; | |
var viewportHeight = 670; | |
// | |
// And away we go | |
// | |
var webpage = require('webpage'); | |
var page = webpage.create(); | |
page.viewportSize = { width: viewportWidth, height: viewportHeight }; | |
page.settings.webSecurityEnabled = false; | |
page.open('http://make8bitart.com/', function (status) { | |
// set the size of the picker | |
var setSize = function (size) { | |
page.evaluate(function (s) { | |
$('#pixel-size').val(s).trigger('change'); | |
}, size); | |
}; | |
// set the color of the picker | |
var setColor = function (color) { | |
page.evaluate(function (c) { | |
$('#hex-color').val(c).focus(); | |
}, color); | |
}; | |
// How to draw a certain color at a certain location | |
var drawPixel = function (color, x, y) { | |
setColor(color); | |
page.sendEvent('click', x, y); | |
}; | |
// Get pixels of an image using a browser canvas render | |
var getPixels = function (url, callback) { | |
page.onCallback = function (width, height, data) { | |
callback(width, height, data); | |
}; | |
page.evaluate(function (url) { | |
var img = new Image; | |
img.onload = function () { | |
var canvas = document.createElement('canvas'); | |
canvas.width = img.width; | |
canvas.height = img.height; | |
var context = canvas.getContext('2d') | |
context.drawImage(img, 0, 0, img.width, img.height); | |
var data = context.getImageData(0, 0, img.width, img.height).data; | |
window.callPhantom(img.width, img.height, data); | |
}; | |
img.src = url; | |
}, url); | |
}; | |
// convert a point to hex to avoid validation issues | |
var toHex = function toHex(n) { | |
return '0123456789ABCDEF'.charAt((n - n % 16) / 16) + '0123456789ABCDEF'.charAt(n % 16); | |
} | |
var convertPointToHex = function (data, o) { // ignore semi-transparency | |
return toHex(data[o]) + toHex(data[o + 1]) + toHex(data[o + 2]); | |
}; | |
// draw what we're told to | |
getPixels(url, function (width, height, data) { | |
setSize(pixelSize); | |
var p, color; | |
for (var y = 0; y < height; y++) { | |
for (var x = 0; x < width; x++) { | |
if (data[p + 3] === 0) { continue; } // ignore full transparency | |
p = ((y * width) + x) * 4; | |
color = convertPointToHex(data, p); | |
drawPixel(color, xoffset + x * pixelSize, yoffset + y * pixelSize); | |
} | |
} | |
// And then take a screenshot | |
page.render('out.png'); | |
phantom.exit(); | |
}); | |
}); |
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