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bubble-drag.html
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bubble-drag.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>Bubbles</title>
<style type="text/css">
canvas{
margin:0px;
padding:0px;
background:transparent;
}
body {
margin:0px;
background:#f00;
}
</style>
<script type="text/javascript">
/**
* @license HTML5 experiment Bubble Drag
* http://www.xarg.org/project/bubble-drag/
*
* Copyright (c) 2011, Robert Eisele (robert@xarg.org)
* Dual licensed under the MIT or GPL Version 2 licenses.
**/
var ctx;
var pi2 = Math.PI * 2
var spec = new Array(
[0xFF, 0x00, 0x00],
[0xFF, 0x00, 0xFF],
[0x00, 0x00, 0xFF],
[0x00, 0xFF, 0x00],
[0xFF, 0xFF, 0x00],
[0xFF, 0x00, 0x00]
);
var number = 11;
var min_size = 40;
var max_size = 15;
var min_pause = 80;
var max_pause = 50;
var width = 665; // 800 - 25 - 2(40+15)
var height = 400; // 455 - 2(40+15)
var steps = 30;
var bubbles = new Array();
var bg_color = spec[0];
var fg_color = color_lightness(bg_color, 80);
var global_drag = -1;
function Bubble() {
this.drag = false;
this.x = Math.random() * width;
this.y = Math.random() * height;
this.size = Math.random() * max_size + min_size;
this.time = Math.random() * max_pause + min_pause;
this.xdest = Math.random() * width;
this.ydest = Math.random() * height;
this.walk = 0;
this.move = function() {
if(this.drag == false) {
if (this.time < this.walk && this.xtmp < 0.01 && this.ytmp < 0.01) {
this.xdest = Math.random() * width;
this.ydest = Math.random() * height;
this.walk = 0;
} else {
if (0 == this.walk) {
this.time = Math.random() * max_pause + min_pause;
}
this.walk++;
}
this.xtmp = (this.x - this.xdest) / steps;
this.x-= this.xtmp;
this.ytmp = (this.y - this.ydest) / steps;
this.y-= this.ytmp;
}
if(global_drag == -1) {
ctx.strokeStyle = 'rgb('+fg_color[0]+','+fg_color[1]+','+fg_color[2]+')';
} else {
ctx.strokeStyle = '#fff';
}
ctx.lineWidth = 4;
ctx.beginPath();
ctx.arc(this.x + 80, this.y, this.size, 0, pi2, true);
ctx.closePath();
ctx.stroke();
}
}
function $(id) {
return document.getElementById(id);
}
// 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)
);
}
// 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)
);
}
function init () {
ctx = $('canvas').getContext('2d');
for (var i = 0; i < number; i++) {
bubbles.push(new Bubble());
}
for (var i = 0; i < height; i++) {
var col = array_gradient(spec, height, i);
ctx.fillStyle = 'rgb('+col[0]+','+col[1]+','+col[2]+')';
ctx.fillRect(0, i, 25, 1);
}
clock();
}
function clock () {
ctx.clearRect(25, 0, width + 135, height + 55);
for (var i = 0; i < number; i++) {
bubbles[i].move();
}
ctx.lineWidth = 0;
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 + 80, bubbles[i].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 + 80, bubbles[i].y, 3, 0, pi2, true);
ctx.closePath();
ctx.fill();
}
window.setTimeout('clock()', 20);
}
document.onmousemove = function (e) {
if (global_drag != -1) {
bubbles[global_drag].x = Math.max(e.pageX, bubbles[global_drag].size+27) - 80;
bubbles[global_drag].y = e.pageY;
} else if (e.pageX <= 25 && e.pageY <= height) {
bg_color = array_gradient(spec, height, e.pageY);
fg_color = color_lightness(bg_color, 80);
document.body.style.background = 'rgb('+bg_color[0]+','+bg_color[1]+','+bg_color[2]+')';
for (var i = 0; i < height; i++) {
var col = array_gradient(spec, height, (i + e.pageY) % height);
ctx.fillStyle = 'rgb('+col[0]+','+col[1]+','+col[2]+')';
ctx.fillRect(0, i, 25, 1);
}
}
}
document.onmousedown = function (e) {
for (var i=0; i<number; i++) {
if(
bubbles[i].x <= e.pageX - 75 && e.pageX <= bubbles[i].x + 85 &&
bubbles[i].y <= e.pageY + 5 && e.pageY <= bubbles[i].y + 5
) {
global_drag = i;
bubbles[i].drag = true;
break;
}
}
}
document.onmouseup = function (e) {
if(global_drag != -1) {
bubbles[global_drag].drag = false;
global_drag = -1;
}
}
</script>
</head>
<body onload="init()">
<canvas id="canvas" height="455" width="800">how can you use the internet?</canvas>
</body>
</html>