add image methods example
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581b87baf9
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8 changed files with 165 additions and 26 deletions
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@ -3,7 +3,7 @@
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<head>
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<title>OxJS Image Demo</title
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<script type="text/javascript" src="../../build/Ox.js"></script>
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<script type="text/javascript" src="../../dev/Ox.js"></script>
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<script type="text/javascript" src="js/image.js"></script>
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</head>
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<body></body>
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@ -2,15 +2,21 @@ Ox.load('Image', function() {
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// see http://en.wikipedia.org/wiki/Lenna
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Ox.Image('png/Lenna.png', function(image) {
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Ox.Image('png/lenna256.png', function(image) {
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var body = Ox.element('body'),
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select = Ox.element('<select>').appendTo(body);
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[
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'Method...', 'blur(1)', 'blur(5)',
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'Method...', 'src("png/lenna256.png")',
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'blur(1)', 'blur(5)',
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'channel("r")', 'channel("g")', 'channel("b")', 'channel("a")',
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'channel("h")', 'channel("s")', 'channel("l")',
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'contour()',
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'depth(1)', 'depth(2)', 'depth(4)',
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'drawCircle([128, 128], 64, {"fill": "rgba(0, 0, 0, 0.5)"})',
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'drawLine([[64, 64], [192, 192]], {"color": "red", "width": 2})',
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'drawPath([[64, 64], [192, 64], [64, 192]], {"close": true, "fill": "rgba(0, 0, 0, 0.5)", "width": 2})',
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'drawRectangle([64, 64], [128, 128], {"fill": "rgba(0, 0, 0, 0.5)"})',
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'drawText("?", [128, 160], {"font": "64px Arial", "outline": "2px white"})',
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'edges()', 'emboss()',
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'encode("secret")', 'decode()',
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'encode("secret", false)', 'decode(false)',
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@ -24,46 +30,39 @@ Ox.load('Image', function() {
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'resize(256, 256)', 'resize(512, 512)',
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'saturation(-0.5)', 'saturation(0.5)',
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'scale(0.5, -1)',
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'sharpen()', 'solarize()',
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'src("png/Lenna.png")', 'src("png/OxJS.png")'
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'sharpen()', 'solarize()'
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].forEach(function(filter) {
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Ox.element('<option>').html(filter).appendTo(select);
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});
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select[0].onchange = function() {
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if (select[0].value[0] == select[0].value[0].toLowerCase()) {
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var split = select[0].value.split('('),
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fn = split[0],
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args = split[1].length == 1 ? []
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: split[1].split(')')[0].split(', ').map(function(v) {
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return v == 'true' ? true
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: v == 'false'? false
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: v[0] == '"' ? v.split('"')[1]
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: parseFloat(v);
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});
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//Ox.print(select[0].value.match(/^(\w+)\((.+)\)$/))
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var match = select[0].value.match(/^(\w+)\((.*?)\)$/),
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fn = match[1],
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args = JSON.parse('[' + match[2] + ']');
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//Ox.print('??', fn, args, image.drawLine)
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if (fn == 'encode' || fn == 'src') {
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image[fn].apply(null, Ox.merge(args, function(image) {
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Ox.element('#filter').attr({
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Ox.element('#image').attr({
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src: image.src()
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}).css({width: '512px', height: '512px'});
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});
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}));
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} else if (fn == 'decode') {
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image[fn].apply(null, Ox.merge(args, function(str) {
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alert(str);
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}));
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} else {
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Ox.element('#filter').attr({
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Ox.element('#image').attr({
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src: image[fn].apply(null, args).src()
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});
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Ox.print('DONE')
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}
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select[0].selectedIndex = 0;
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}
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}
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Ox.element('<br>').appendTo(body);
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Ox.element('<img>').attr({
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src: image.src()
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}).appendTo(body);
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Ox.element('<img>').attr({
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id: 'filter',
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id: 'image',
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src: image.src()
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}).appendTo(body);
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//Ox.element('<img>').attr({src: image.saturation(0.5).blur().url()}).appendTo(Ox.element('body'));
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8
examples/lenna/css/example.css
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8
examples/lenna/css/example.css
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body {
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margin: 16px;
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background-color: rgb(240, 240, 240);
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}
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img {
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display: block;
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margin: 8px 0 0 2px;
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}
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13
examples/lenna/index.html
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13
examples/lenna/index.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Lenna</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<link rel="shortcut icon" type="image/png" href="../../source/Ox.UI/png/icon16.png"/>
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<link rel="stylesheet" type="text/css" href="css/example.css"/>
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<script type="text/javascript" src="../../dev/Ox.js"></script>
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<script type="text/javascript" src="js/example.js"></script>
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</head>
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<body>
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</body>
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</html>
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90
examples/lenna/js/example.js
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90
examples/lenna/js/example.js
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/*
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Load the image module.
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*/
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Ox.load('Image', function() {
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/*
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Load our image (about which you can read more on
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<a href="see http://en.wikipedia.org/wiki/Lenna">Wikipedia</a>).
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*/
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Ox.Image('png/lenna256.png', function(image) {
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/*
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Create some DOM elements.
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*/
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var $body = Ox.$('body'),
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$select = Ox.$('<select>').bind({change: change}).appendTo($body),
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$image = Ox.$('<img>').attr({src: image.src()}).appendTo($body);
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[
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'Method...', 'src("png/lenna256.png")',
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'blur(2)', 'blur(4)',
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'channel("r")', 'channel("g")', 'channel("b")',
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'channel("h")', 'channel("s")', 'channel("l")',
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'contour()',
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'depth(1)', 'depth(2)', 'depth(4)',
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'drawCircle([128, 128], 64, {"fill": "rgba(0, 0, 0, 0.5)"})',
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'drawLine([[64, 64], [192, 192]], {"color": "green", "width": 2})',
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'drawPath([[64, 64], [192, 64], [64, 192]], {"close": true})',
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'drawRectangle([64, 64], [128, 128], {"fill": "red", "width": 0})',
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'drawText("?", [16, 240], {"color": "blue", "font": "64px Arial"})',
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'edges()', 'emboss()',
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'encode("secret")', 'decode()',
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'encode("secret", false)', 'decode(false)',
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'encode("secret", 1)', 'decode(1)',
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'encode("secret", false, 15)', 'decode(false, 15)',
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'encode("secret", 127)', 'decode(127)',
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'filter([0, 1, 0, 1, -2, 1, 0, 1, 0])',
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'hue(-60)', 'hue(60)',
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'invert()',
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'lightness(-0.5)', 'lightness(0.5)',
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'map(function(v, xy) { return Ox.sum(xy) % 2 ? [0, 0, 0] : v; })',
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'mosaic(4)', 'motionBlur()',
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'photocopy()', 'pixel([16, 16], [255, 255, 255])', 'posterize()',
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'saturation(-0.5)', 'saturation(0.5)',
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'sharpen()', 'solarize()'
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].forEach(function(method) {
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Ox.$('<option>').html(method).appendTo($select);
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});
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function change() {
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var value = $select.val(),
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match = value.match(/^(\w+)\((.*?)\)$/),
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fn = match[1], args;
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/*
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The <code>map</code> method takes a function as its argument, which
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we can't <code>JSON.parse</code>, but have to <code>eval</code>.
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*/
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try {
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args = JSON.parse('[' + match[2] + ']');
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} catch(e) {
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args = [eval('f = ' + match[2])];
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}
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/*
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The <code>src</code> and <code>encode</code> methods are
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asynchronous and take a callback function.
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*/
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if (fn == 'src' || fn == 'encode') {
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image[fn].apply(null, Ox.merge(args, function(image) {
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$image.attr({src: image.src()});
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}));
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/*
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The <code>decode</code> method is asynchronous too, and its callback
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function gets passed a string.
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*/
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} else if (fn == 'decode') {
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image[fn].apply(null, Ox.merge(args, function(str) {
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alert(str);
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}));
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/*
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All other methods simply return the image.
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*/
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} else {
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$image.attr({src: image[fn].apply(null, args).src()});
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}
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$select.val('Method...');
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}
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});
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});
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BIN
examples/lenna/png/lenna256.png
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BIN
examples/lenna/png/lenna256.png
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/*
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Ox.Image provides a pair of methods, <code>encode</code> and
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<code>decode</code>, which can be used for
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<a href="http://en.wikipedia.org/wiki/Steganography">steganography</a>, i.e. to
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add a hidden message to an image.<br><br>
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The signature of the <code>encode</code> function is
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<code>image.encode(message, deflate, mode, callback)</code>.
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<code>deflate</code> turns deflate-compression on or off, and <code>mode</code>
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determines which bits of the image the message will be written to — but
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for most purposes, the default values (<code>true</code> and <code>0</code>)
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are fine, so <code>deflate</code> and <code>mode</code> can be omitted.<br>
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<br>
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In this example, we demonstrate a valid use case for <code>deflate</code> and
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<code>mode</code>: To encode an decoy message (a line of text), which will be
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relatively easy to detect, and then the the actual message, (another image,
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itself containing another line of text), which will be harder to detect.
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*/
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'use strict';
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Ox.load('Image', function() {
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var $body = Ox.$('body'),
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$table = Ox.$('<table>').appendTo($body),
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var $table = Ox.$('<table>').appendTo(Ox.$('body')),
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$tr,
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text = {
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iceland: 'The first image he told me about '
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vietnam: 'He said for him it was the image of happiness, '
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+ 'and that he had often tried to link it to other images, '
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+ 'but it had never worked.'
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},
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i = 0;
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};
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encode(decode);
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/*
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So we first encode two lines text into two images, by writing them bit by
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bit (without compression, <code>deflate = false</code>), into the least
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significant bit of each 8-bit RGB value (<code>mode = 1</code>). Then we
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encode one image into the other: We take the (deflate-compressed,
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<code>deflate = true</code>) data URL of the source image and flip, if
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needed, the second least significant bit of each RGB value of the target
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image, so that the number of bits set to 1, modulo 2 (for example: 10101010
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-> 0), is the bit we're encoding (<code>mode = -1</code>). As the least
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significant bit remains untouched, this will preserve the encoded text.
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*/
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function encode(callback) {
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status('Load iceland.png');
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Ox.Image('png/iceland.png', function(iceland) {
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});
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}
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/*
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Finally, we decode all the data again.
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*/
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function decode(iceland) {
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status('Decode the least signigicant bits of iceland.png');
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iceland.decode(false, 1, function(str) {
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} else {
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$td.append(value);
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}
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$tr.append($td)
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$tr.append($td);
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}
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});
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