//
// CSS Linked Photo Shuffler v1.1 by
//   Carl Camera
//   http://iamacamera.org 
//
// SetOpacity Function and inpiration from Photo Fade by
//   Richard Rutter
//   http://clagnut.com
//
// License: Creative Commons Attribution 2.5  License
//   http://creativecommons.org/licenses/by/2.5/
//

// Customize your photo shuffle settings
// 
// * Surround the target <img /> with a <div>. specify id= in both
// * The first and final photo displayed is in the html <img> tag
// * The array contains paths to photos you want in the rotation. 
//   If you want the first photo in the rotation, then it's best to
//   put it as the final array image.  All photos must be same dimension
// * The rotations variable specifies how many times to repeat array.
//   images. zero is a valid rotation value.

var gblPhotoShufflerDivId = "photodiv";
var gblPhotoShufflerImgId = "photoimg";
var gblPhotoShufflerAnchorId = "photoanchor";
var gblImg = new Array(
	"/sites/all/themes/photogenic/foto-01.jpg",
	"/sites/all/themes/photogenic/foto-02.jpg",
	"/sites/all/themes/photogenic/foto-03.jpg",
	"/sites/all/themes/photogenic/foto-04.jpg"
);
var gblHref = new Array(
	"http://www.joachimliedtke.com",
	"http://www.joachimliedtke.com",
	"http://www.joachimliedtke.com",
	"http://www.joachimliedtke.com"
);
var gblPauseSeconds = 10.25;
var gblFadeSeconds = 1.85;
var gblRotations = 10;

// End Customization section

var gblDeckSize = gblImg.length;
var gblOpacity = 100;
var gblOnDeck = 0;
var gblStartImg;
var gblStartHref;
var gblImageRotations = gblDeckSize * (gblRotations+1);

window.onload = photoShufflerLaunch;

function photoShufflerLaunch() {
	var theimg = document.getElementById(gblPhotoShufflerImgId);
		gblStartImg = theimg.src; // save away to show as final image
	var theanchor = document.getElementById(gblPhotoShufflerAnchorId);
		gblStartHref = theimg.href; // save away to show as final image
	
	document.getElementById(gblPhotoShufflerDivId).style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
	setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
}

function photoShufflerFade() {
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	
	// determine delta based on number of fade seconds
	// the slower the fade the more increments needed
		var fadeDelta = 100 / (30 * gblFadeSeconds);
	
	// fade top out to reveal bottom image
	if (gblOpacity < 2*fadeDelta ) {
		gblOpacity = 100;

		// stop the rotation if we're done
		if (gblImageRotations < 1) return;
		photoShufflerShuffle();

		// pause before next fade
		setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
	}
	else {
		gblOpacity -= fadeDelta;
		setOpacity(theimg,gblOpacity);
		setTimeout("photoShufflerFade()",30);  // 1/30th of a second
	}
}

function photoShufflerShuffle() {
	var thediv = document.getElementById(gblPhotoShufflerDivId);
	var theimg = document.getElementById(gblPhotoShufflerImgId);
	var theanchor = document.getElementById(gblPhotoShufflerAnchorId);
	
	// copy div background-image to img.src
	theimg.src = gblImg[gblOnDeck];
	theanchor.href = gblHref[gblOnDeck];
	window.status = gblHref[gblOnDeck]; // updates status bar (optional)

	// set img opacity to 100
	setOpacity(theimg,100);
	
	// shuffle the deck
	gblOnDeck = ++gblOnDeck % gblDeckSize;

	// decrement rotation counter
	if (--gblImageRotations < 1) {
		// insert start/final image if we're done
		gblImg[gblOnDeck] = gblStartImg;
		gblHref[gblOnDeck] = gblStartHref;
	}
	
	// slide next image underneath
	thediv.style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
}

function setOpacity(obj, opacity) {
	opacity = (opacity == 100)?99.999:opacity;
	
	// IE/Win
	obj.style.filter = "alpha(opacity:"+opacity+")";
	
	// Safari<1.2, Konqueror
	obj.style.KHTMLOpacity = opacity/100;
	
	// Older Mozilla and Firefox
	obj.style.MozOpacity = opacity/100;
	
	// Safari 1.2, newer Firefox and Mozilla, CSS3
	obj.style.opacity = opacity/100;
}