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image-histogram.html
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image-histogram.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Image Histogram</title>
<style type="text/css">
body {
background:#BDC1BD;
margin:0px;
text-align:center;
}
#main {
margin:auto;
width:932px;
position:relative;
}
#image {
float:left;
position:absolute;
top:200px;
}
#picture {
border: 8px solid #8D958C;
height:300px;
width:450px;
-moz-border-radius-topleft:12px;
-webkit-border-top-left-radius:12px;
-moz-border-radius-topright:12px;
-webkit-border-top-right-radius:12px;
-moz-border-radius-bottomleft:12px;
-webkit-border-bottom-left-radius:12px;
cursor:pointer;
}
#histogram canvas {
position:absolute;
top:215px;
width:256px;
height:300px;
left:450px;
padding-left:97px;
padding-right:97px;
border-bottom:1px solid #8D958C;
}
#spin {
position:absolute;
top:358px;
left:222px;
}
input {
border: 8px solid #8D958C;
}
#submit {
background:#8D958C;
-moz-border-radius-bottomright:12px;
-webkit-border-bottom-right-radius:12px;
}
#url {
width:300px;
-moz-border-radius-bottomleft:12px;
-webkit-border-bottom-left-radius:12px;
}
#xarg {
position:fixed;
right:20px;
bottom:20px;
z-index:1000;
border:0px;
}
</style>
<script type="text/javascript">
/**
* @license HTML5 experiment Image Histogram
* http://www.xarg.org/project/image-histogram/
*
* Copyright (c) 2011, Robert Eisele (robert@xarg.org)
* Dual licensed under the MIT or GPL Version 2 licenses.
**/
var spin = null;
var ctx = null;
var img = null;
var circle = Math.PI * 2;
var drawSpin = 1;
var drawHist = false;
var spinDot = new Array([10,4],[14,6],[16,10],[14,14],[10,16],[6,14],[4,10],[6,6]);
var spinPos = 0;
var imgMax = -1;
var imgPos = -1;
var lines = new Array();
var errorSpan = 0;
function $(id) {
return document.getElementById(id);
}
function init() {
spin = $('spin').getContext('2d');
ctx = $('canvas').getContext('2d');
ctx.fillStyle = '#919990';
for(var i=0; i < 256; i++) {
lines.push(new Line(i));
}
img = $('picture');
img.onload = function() {
try {
var r, g, b;
var n = img.height * img.width;
for (var i=0; i < 256; i++) {
lines[i].dest = 0;
}
var canvas = document.createElement('canvas');
canvas.setAttribute('width', img.width);
canvas.setAttribute('height', img.height);
var tmp = canvas.getContext('2d');
tmp.drawImage(img, 0, 0);
var img_data = tmp.getImageData(0, 0, img.width, img.height);
for (var i = 0; i < img.height; i++) {
for (var j = 0; j < img.width; j++) {
var ndx = (i * (img.width << 2)) + (j << 2);
r = img_data.data[ndx + 0];
g = img_data.data[ndx + 1];
b = img_data.data[ndx + 2];
var slot = Math.round((r + g + b) / 3);
lines[slot].dest+= slot / n;
}
}
for (var i = 0; i < 256; i++) {
imgMax = Math.max(imgMax, lines[i].dest);
}
drawHist = true;
} catch(e) {
drawSpin = 0;
$('picture').style.cursor = 'pointer';
}
}
draw();
rotateImage();
}
function Line(ndx) {
this.x = ndx;
this.y = 0;
this.dest = 0;
this.draw = function() {
this.tmp = (this.y - this.dest * 300 / imgMax) / 10;
this.y-= this.tmp;
ctx.fillRect(this.x, 300 - this.y, 1, 300);
return Math.abs(this.tmp) < 0.01;
}
}
function rotateImage() {
if(drawHist) return;
drawSpin = 1;
$('picture').style.cursor = 'default';
if(imgPos == -1) {
imgPos = new Date().getMonth();
} else {
imgPos++;
imgPos%= 12;
}
$('picture').src = '/image/calendar/' + (imgPos + 1) + '.jpg';
}
function loadImage() {
if(drawHist || $('url').value == "" || $('url').value == "http://") return;
if($('url').value.substr(0, 7) == "http://") {
drawSpin = 1;
with($('picture')) {
style.cursor = 'default';
// could this be a browser security option like netscape.security.PrivilegeManager
src = '/imagepipe.php?x=' + encodeURIComponent($('url').value);
}
}
}
function draw() {
if(0 != drawSpin && 0 == (drawSpin++ % 5)) {
spin.clearRect(0, 0, 20, 20);
if(errorSpan++ > 100) {
errorSpan = 0;
drawSpin = 0;
rotateImage();
alert("The requested image could not be displayed.");
} else {
spin.fillStyle = '#fff';
spin.beginPath();
spin.arc(10, 10, 10, 0, circle, true);
spin.closePath();
spin.fill();
for (var i=0; i < 8; i++) {
spin.fillStyle = 'rgba(50,50,50,'+(0.3 + ((spinPos + i) & 7) * 0.1)+')';
spin.beginPath();
spin.arc(spinDot[i][0], spinDot[i][1], 2, 0, circle, true);
spin.closePath();
spin.fill();
}
spinPos--;
}
}
if(drawHist) {
var finish = 1;
ctx.clearRect(0, 0, 256, 300);
for (var i = 0; i < 256; i++) {
finish&= lines[i].draw();
}
if (finish == 1) {
drawHist = false;
drawSpin = 0;
errorSpan = 0;
spin.clearRect(0, 0, 20, 20);
$('picture').style.cursor = 'pointer';
}
}
window.setTimeout('draw()', 20);
}
</script>
</head>
<body onload="init()">
<div id="main">
<div id="image">
<img id="picture" src="#" onclick="rotateImage();$('url').value = 'http://'" />
</div>
<div id="histogram">
<canvas id="canvas" height="300" width="256">how can you use the internet?</canvas>
</div>
<canvas id="spin" height="20" width="20"></canvas>
<form>
<input type="text" id="url" onfocus="this.value=''" onblur="if(!this.value)this.value='http://'" value="http://" />
<input type="button" id="submit" onclick="loadImage()" value="GO" />
</form>
</div>
</body>
</html>