/*
AnimatedPNG - A Javascript library for animated PNG images 
Copyright (C) 2007 Steve Jones (steve@squaregoldfish.co.uk)
Version 1.00
Web: http://www.squaregoldfish.co.uk/software/animatedpng
Email: animatedpng@squaregoldfish.co.uk

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details:
http://www.gnu.org/licenses/gpl.txt
*/
animatedPNGs = new Array(); function AnimatedPNG(imageName, firstImage, imageCount, delay)
{ this.animName = imageName; this.images = new Array(); this.delays = new Array(); this.padCount = 0; this.firstImageNumber = 0; this.lastImageNumber = 0; this.currentImage = 0; this.repeat = true; this.animationRunning = true; this.animationDrawn = false; this.draw = function()
{ var html = new Array(); html[html.length] = '<img id="' + this.animName + '" src=""'; if (this.altText)
html[html.length] = ' alt="' + this.altText + '"'; if (this.titleText)
html[html.length] = ' title="' + this.titleText + '"'; html[html.length] = '/>'; document.write(html.join('')); document.getElementById(this.animName).src = this.images[this.firstImageNumber].src; setTimeout('animatedPNGs[\'' + this.animName + '\'].drawFrame()', this.delays[this.firstImageNumber]); this.drawn = true;}
this.setFrameDelay = function(frame, delay)
{ this.delays[frame] = delay;}
this.setRepeat = function(repeat)
{ this.repeat = repeat; if (repeat && !this.animationRunning)
this.startAnimation();}
this.startAnimation = function()
{ if (!this.animationRunning)
{ this.animationRunning = true; this.drawFrame();}
}
this.stopAnimation = function()
{ this.animationRunning = false;}
this.drawFrame = function()
{ var drawImage = true; this.currentImage++; if (this.currentImage > this.lastImageNumber)
{ if (this.repeat)
this.currentImage = this.firstImageNumber; else
{ drawImage = false; this.animationRunning = false;}
}
if (drawImage)
{ document.getElementById(this.animName).src = this.images[this.currentImage].src; if (this.delays[this.currentImage])
delay = this.delays[this.currentImage]; if (this.animationRunning)
setTimeout('animatedPNGs[\'' + this.animName + '\'].drawFrame()', delay);}
}
var head = null; var numbers = ''; var suffix = firstImage.substring(firstImage.length - 4, firstImage.length); if (suffix.search(/\.png/i) != 0 && suffix.search(/\.jpg/i) != 0)
throw 'Invalid suffix for first image in animated PNG ' + imageName + ' - must be .png or .jpg'; var finishedNumbers = false; var curIndex = firstImage.length - 5; for (; curIndex >= 0 && !finishedNumbers; curIndex--)
{ if (/[0-9]/.test(firstImage.charAt(curIndex)))
{ numbers = firstImage.charAt(curIndex) + numbers; if (firstImage.charAt(curIndex) == '0')
this.padCount++;}
else
finishedNumbers = true;}
numbers = parseInt(numbers); this.firstImageNumber = numbers; this.currentImage = numbers; head = firstImage.substring(0, curIndex + 2); for (var i = numbers; i < imageCount + numbers; i++)
{ this.images[i] = new Image; this.images[i].src = head + pad(i, this.padCount) + suffix; this.lastImageNumber = i; this.delays[i] = delay;}
animatedPNGs[imageName] = this;}
function pad(number, padCount)
{ var result = '' + number; while (result.length < padCount + 1)
result = '0' + result; return result;}