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bubble-evolution.html
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bubble-evolution.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>Bubble Evolution</title>
<style type="text/css">
canvas {
position:absolute;
}
body {
margin:0px;
}
#scroller {
position:fixed;
right:20px;
top:20px;
z-index:999;
}
</style>
<script type="text/javascript">
/**
* @license HTML5 experiment Bubble Evolution
* http://www.xarg.org/project/bubble-evolution/
*
* Copyright (c) 2011, Robert Eisele ([email protected])
* Dual licensed under the MIT or GPL Version 2 licenses.
**/
var ctx;
var canvas;
var pi2 = Math.PI * 2;
var number = 35;
var width = window.innerWidth;
var height = window.innerHeight;
var bubbles = new Array();
var loupe_x = 75;
var loupe_y = 50;
var loupe_drag = false;
var manual_pick = false;
var spec = new Array(
[0xFF, 0x00, 0x00],
[0xFF, 0x00, 0xFF],
[0x00, 0x00, 0xFF],
[0x00, 0xFF, 0x00],
[0xFF, 0xFF, 0x00],
[0xFF, 0x00, 0x00]
);
var color_step = Math.floor(Math.random() * 255);
var bg_color = array_gradient(spec, 256, color_step);
var fg_color = color_lightness(bg_color, 80);
// we have to fix a <del>bug</del> feature in FF
var is_FF = navigator.userAgent.indexOf("Firefox") != -1;
function Bubble() {
this.x = Math.random() * width;
this.y = Math.random() * height;
this.size = Math.random() * 4 + 8;
this.time = Math.random() * 50 + 80;
this.xdest = Math.random() * 900 - 450 + loupe_x + 125;
this.ydest = Math.random() * 900 - 450 + loupe_y + 125;
this.walk = 0;
this.move = function() {
if (this.time < this.walk && this.xtmp < 0.01 && this.ytmp < 0.01) {
this.xdest = Math.random() * 500 - 250 + loupe_x + 125;
this.ydest = Math.random() * 500 - 250 + loupe_y + 125;
this.walk = 0;
} else {
if (0 == this.walk) {
this.time = Math.random() * 50 + 80;
}
this.walk++;
}
this.xtmp = (this.x - this.xdest) / 60;
this.x-= this.xtmp
this.ytmp = (this.y - this.ydest) / 60;
this.y-= this.ytmp
}
}
function init() {
document.body.style.background = 'rgb('+bg_color[0]+','+bg_color[1]+','+bg_color[2]+')';
for (var i = 0; i < number; i++) {
bubbles.push(new Bubble());
}
canvas = document.createElement('canvas');
canvas.setAttribute('width', 390);
canvas.setAttribute('height', 390);
canvas.style.top = loupe_y + "px";
canvas.style.left = loupe_x + "px";
document.body.appendChild(canvas);
ctx = canvas.getContext('2d');
var can = document.getElementById('scroller');
var scr = can.getContext('2d');
scr.beginPath();
scr.moveTo(11,0);
scr.lineTo(0,16);
scr.lineTo(7,16);
scr.lineTo(7,54);
scr.lineTo(0,54);
scr.lineTo(11,70);
scr.lineTo(22,54);
scr.lineTo(15,54);
scr.lineTo(15,16);
scr.lineTo(22,16);
scr.lineTo(11,0);
scr.fill();
scr.clearRect(0, 35, 22, 1);
can.onmousedown = function(e) {
color_rotate(Math.round(((e.pageY - 20) - 35) *4 / 35));
manual_pick = true;
}
clock();
}
// part of xColor v2
function color_lightness (col, level) {
// skip the normalization part, we assume, we have L=120
return new Array(
Math.ceil(col[0] * level / 120),
Math.ceil(col[1] * level / 120),
Math.ceil(col[2] * level / 120)
);
}
// part of xColor v2
function array_gradient (arr, size, ndx) {
var e = Math.floor(ndx * (arr.length - 1) / size);
var m = (ndx - size * e / (arr.length - 1)) / size;
var a = arr[e];
var b = arr[e + 1];
if(!b) b = a;
return new Array (
parseInt(a[0] + arr.length * (b[0] - a[0]) * m),
parseInt(a[1] + arr.length * (b[1] - a[1]) * m),
parseInt(a[2] + arr.length * (b[2] - a[2]) * m)
);
}
function is_grip(e) {
/* Nice approximation, isn't it? :) */
var mx = e.pageX - loupe_x;
var my = e.pageY - loupe_y;
var a = 187 * mx - 140 * my - 13140;
var tmp = 167 * mx - 160 * my + 1800;
if(-tmp * a > 0 && 20 * tmp * (mx + my - 420) > 0) {
return true;
}
var tmp = 160 * mx - 167 * my - 1800;
if(-tmp * a > 0 && 27 * tmp * (mx + my - 747) > 0) {
return true;
}
return false;
}
function clock () {
ctx.clearRect(0, 0, 250, 250);
ctx.lineWidth = 2;
ctx.strokeStyle = 'rgb('+fg_color[0]+','+fg_color[1]+','+fg_color[2]+')';
for (var i = 0; i < number; i++) {
bubbles[i].move();
ctx.beginPath();
ctx.arc(bubbles[i].x - loupe_x, bubbles[i].y - loupe_y, bubbles[i].size, 0, pi2, true);
ctx.closePath();
ctx.stroke();
}
ctx.fillStyle = 'rgb('+bg_color[0]+','+bg_color[1]+','+bg_color[2]+')';
for (var i=0; i<number; i++) {
ctx.beginPath();
ctx.arc(bubbles[i].x - loupe_x, bubbles[i].y - loupe_y, bubbles[i].size, 0, pi2, true);
ctx.closePath();
ctx.fill();
}
ctx.fillStyle = 'rgb('+fg_color[0]+','+fg_color[1]+','+fg_color[2]+')';
for (var i=0; i<number; i++) {
ctx.beginPath();
ctx.arc(bubbles[i].x - loupe_x, bubbles[i].y - loupe_y, 1.5, 0, pi2, true);
ctx.closePath();
ctx.fill();
}
ctx.strokeStyle = 'rgb('+bg_color[0]+','+bg_color[1]+','+bg_color[2]+')';
ctx.lineWidth = 500;
ctx.beginPath();
// FF SUXX ;>
if(is_FF) {
ctx.arc(125, 125, 373, 0, pi2, true);
} else {
ctx.arc(125, 125, 125, 0, pi2, true);
}
ctx.closePath();
ctx.stroke();
ctx.lineWidth = 5;
ctx.strokeStyle = 'rgb('+fg_color[0]+','+fg_color[1]+','+fg_color[2]+')';
ctx.beginPath();
ctx.arc(125, 125, 125, 0, pi2, true);
ctx.closePath();
ctx.stroke();
ctx.lineWidth = 8;
ctx.strokeStyle = 'rgb('+bg_color[0]+','+bg_color[1]+','+bg_color[2]+')';
ctx.beginPath();
ctx.arc(126, 126, 130, 0, pi2, true);
ctx.closePath();
ctx.stroke();
ctx.beginPath();
ctx.moveTo(220,200);
ctx.lineTo(200,220);
ctx.lineTo(360,387);
ctx.lineTo(387,360);
ctx.lineTo(220,200);
ctx.fill();
window.setTimeout('clock()', 20);
}
document.onmousemove = function(e) {
document.body.style.cursor = "default";
if(loupe_drag != false) {
loupe_x = e.pageX - loupe_drag[0];
loupe_y = e.pageY - loupe_drag[1];
document.body.style.cursor = "pointer";
canvas.style.top = loupe_y + "px";
canvas.style.left = loupe_x + "px";
} else if (manual_pick) {
color_rotate(Math.round(((e.pageY - 20) - 35) *4 / 35));
} else if(is_grip(e)) {
document.body.style.cursor = "pointer";
}
}
document.onmousedown = function(e) {
if(is_grip(e)) {
loupe_drag = [e.pageX - loupe_x, e.pageY - loupe_y];
}
}
document.onmouseup = function() {
loupe_drag = false;
manual_pick = false;
}
function mousewheel(event){
var delta = 0;
if (event.wheelDelta) {
delta = event.wheelDelta / 120;
} else if (event.detail) {
delta =-event.detail / 3;
}
color_rotate(delta);
}
function color_rotate(delta) {
bg_color = array_gradient(spec, 256, (color_step+= delta) & 0xff);
fg_color = color_lightness(bg_color, 80);
document.body.style.background = 'rgb('+bg_color[0]+','+bg_color[1]+','+bg_color[2]+')';
}
if (window.addEventListener) {
window.addEventListener('DOMMouseScroll', mousewheel, false);
}
window.onmousewheel = document.onmousewheel = mousewheel;
</script>
</head>
<body onload="init()">
<canvas id="scroller" height="70" width="22">How can you use the internet?</canvas>
</body>
</html>