// ========================================================
//            ====== Javascript Slideshow ======
// script written by Gerard Ferrandez - December 31, 2006
// http://www.dhteumeuleu.com/
// ========================================================

var diap = {
	/////////////////////////////////
	BR : 3,     // border size in px
	ZR : .75,   // zoom ratio
	SP : .1,    // speed
	/////////////////////////////////
	V : false,
	S : false,
	G : true,

	resize : function () {
		/* ==== window resize event ==== */
		diap.nw = diap.scr.offsetWidth;
		diap.nh = diap.scr.offsetHeight;
		diap.nwu = (diap.nw * diap.ZR);
		diap.nhu = (diap.nh * diap.ZR);
		diap.nwt = Math.floor((diap.nw * (1 - diap.ZR) * .5) / (diap.NX - 1)) - diap.BR;
		diap.nht = Math.floor((diap.nh * (1 - diap.ZR) * .5) / (diap.NY - 1)) - diap.BR;
		diap.rc  = 229 / ((diap.nw / diap.NX) - diap.nwt);
		if (diap.N) {
			diap.setPosition();
			if (!diap.G) diap.delLabels();
		}
	},

	setPosition : function () {
		/* ==== calculate image target position  ==== */
		var k = 0;
		var y = this.S ? this.BR + Math.floor((this.NY - this.Y - 1) * (this.nht + this.BR)) : 0;
		for (var j = 0; j < this.NY; j++) {
			var x = this.S ? this.BR + Math.floor((this.NX - this.X - 1) * (this.nwt + this.BR)) : 0;
			for (var i = 0; i < this.NX; i++) {
				var o = this.spa[k++];
				o.y1 = y;
				o.x1 = x;
				o.w1 = this.S ? (o == this.S ? this.nwu - this.BR : this.nwt) : Math.ceil(this.nw / this.NX) - this.BR;
				o.h1 = this.S ? (o == this.S ? this.nhu - this.BR : this.nht) : Math.ceil(this.nh / this.NY) - this.BR;
				x += this.S ? ((this.X == i) ? this.nwu : this.nwt + this.BR) : Math.ceil(this.nw / this.NX);
			}
			y += this.S ? ((this.Y == j) ? this.nhu : this.nht + this.BR) : Math.ceil(this.nh / this.NY);
		}
	},

	delLabels : function () {
		/* ==== remove texts ==== */
		for ( var i = 0; i < diap.N; i++) {
			var o = diap.spa[i];
			if (o.T) diap.scr.removeChild(o.T);
			o.T = false;
		}
	},

	run : function () {
		/* ==== main loop ==== */
		for ( var i = 0; i < diap.N; i++) diap.spa[i].move();
		setTimeout(diap.run, 16);
	},

	init : function (container, NX, NY, path, images) {
		/* ==== initialize script ==== */
		this.scr = id(container);
		if (!this.scr) return false;/*if (!this.scr || NX * NY != images.length) { alert('ID-10-T error...'); return false; }*/
		this.NX = NX;
		this.NY = NY;
		this.spa = {};
		this.resize();
		var k = 0;
		for (var y = 0; y < this.NY; y++) {
			for (var x = 0; x < this.NX; x++) {
				/* ==== create HTML elements ==== */
				var s = this.spa[k] = document.createElement('div');
				s.img = document.createElement('img');

				/* ==== opacity optimized function ==== */
				s.img.setOpacity = function (alpha) {
					if (alpha < 0) alpha = 0; else if (alpha > 100) alpha = 100;
					if (alpha == 100) {
						/* ==== speed opt - remove IE filter ==== */
						this.style.visibility = 'visible';
						this.style.filter = '';
						this.style.opacity = 1;
						return 100;
					} else if (alpha == 0) {
						/* ==== hide image, remove opacity ==== */
						this.style.visibility = 'hidden';
						this.style.filter = '';
						this.style.opacity = 0;
						return 0;
					}
					if (this.filters) {
						/* ==== IE filter ==== */
						if (!this.filters.alpha) this.style.filter = 'alpha(opacity=' + alpha + ')';
						else this.filters.alpha.opacity = alpha;
					/* ==== CSS opacity ==== */
					} else this.style.opacity = alpha * .01;
					return alpha;
				}
				s.img.src = id('loading').src;
				s.appendChild(s.img);
				this.scr.appendChild(s);

				/* ==== pre-load image ==== */
				s.pre = new Image();
				s.pre.obj = s;
				s.pre.onload = function() { this.obj.img.src = this.src; }
				s.pre.src = path + images[k][0];

				/* ==== set image variables ==== */
				s.x  = x;
				s.y  = y;
				s.x0 = x * (this.nw / this.NX) + (this.nw / this.NX) / 2;
				s.y0 = y * (this.nh / this.NY) + (this.nh / this.NY) / 2;;
				s.x1 = x * (this.nw / this.NX);
				s.y1 = y * (this.nh / this.NY);
				s.w0 = 0;
				s.h0 = 0;
				s.w1 = 0;
				s.h1 = 0;
				s.V  = 0;
				s.t  = images[k][1];
				s.T  = false;

				/* ==== function move image ==== */
				s.move = function() {
					/* ==== position images ==== */
					this.style.left   = px(this.x0 += (this.x1 - this.x0) * diap.SP);
					this.style.top    = px(this.y0 += (this.y1 - this.y0) * diap.SP);
					this.style.width  = px(this.w0 += (this.w1 - this.w0) * diap.SP);
					this.style.height = px(this.h0 += (this.h1 - this.h0) * diap.SP);
					if (this != diap.S) {
						/* ==== set image background color ==== */
						if (Math.abs(this.w1 - this.w0) > 1) {
							var c = (!diap.G && this.V > 0) ? 255 : 16 + Math.round(255 - diap.rc * (this.w0 - diap.nwt));
							this.style.background = 'RGB('.concat(c, ',', c, ',', c, ')');
						}
						if (this == diap.V) {
							/* ==== on mouseover: fade in ==== */
							if (this.V < 100) this.img.setOpacity(this.V += 5);
						} else {
							/* ==== fade out ==== */
							if (this.V >= 0 && diap.G != this) this.img.setOpacity(this.V -= 2);
						}
					}
					/* ==== text effect ==== */
					if (this.T) this.dispLabel();
				}

				/* ==== display text function (typewriter FX) ==== */
				s.dispLabel = function() {
					if (diap.G || diap.S == this) {
						/* ==== zoomed image ==== */
						this.T.style.left  = px(this.x0);
						this.T.style.top   = px(this.y0);
						this.T.style.width = px(this.w0);
					} else {
						/* ==== calculate text position ==== */
						var xt = diap.S.x0 + this.w0 + diap.BR;
						if (this.y == diap.Y) {
							this.T.style.top = px(this.y0 - this.f - diap.BR);
							if (this.y == 0) var xt = diap.S.x0;
						} else this.T.style.top = px(this.y0 - (this.y <= diap.Y ? diap.BR : 0));
						if (this.x > diap.X) this.T.style.left = px(diap.S.w0 + diap.S.x0 - diap.nwu * .5);
						else this.T.style.left = px(xt);
						if (this != diap.V) {
							/* ==== text type out ==== */
							this.Tp--;
							this.T.innerHTML = this.t.substring(0, this.Tp);
							if (this.Tp < 1) {
								diap.scr.removeChild(this.T);
								this.T = false;
							}
						} else {
							if (this.Tp < this.t.length) {
								/* ==== text type in ==== */
								this.Tp++;
								this.T.innerHTML = this.t.substring(0, this.Tp);
							}
						}
					}
				}

				/* ==== create text function ==== */
				s.createLabel = function () {
					this.T = document.createElement('div');
					this.T.className = 'label';
					if (!diap.G && this.x > diap.X) this.T.style.textAlign = 'right';
					this.f = 4 + Math.round(Math.sqrt(diap.nht * 2));
					if(this == diap.S) {
						this.f *= 2;
						this.T.style.background = '#333';
						this.T.style.textAlign = 'left';
					}
					/*this.T.style.fontSize = ''.concat(this.f, 'px');*/
					this.T.innerHTML   = this.t;
					this.T.style.left = px(-1000);
					this.T.style.width = px(diap.nwu * .5);
					this.T.style.height = px(this.f + 3);
					this.Tp = 0;
					diap.scr.appendChild(this.T);
				}

				/* ==== on mouse over event ==== */
				s.onmouseover = function() {
					if (diap.S != this && diap.G != this) {
						/* ==== display image ==== */
						this.img.setOpacity(100);
						this.V = this.img.setOpacity(20);
					}
					/* ==== create text ==== */
					if (!this.T) this.createLabel();
					diap.V = this;
				}

				/* ==== on click event ==== */
				s.onclick = function() {
					/* ==== memorize selected image ==== */
					diap.X = this.x;
					diap.Y = this.y;
					diap.V = false;
					diap.G = false;
					this.V = this.img.setOpacity(100);
					diap.delLabels();
					if (diap.S == this) {
						/* ==== zoom out - grid mode on ==== */
						diap.S = false;
						diap.G = this;
						for (var i = 0; i < diap.N; i++) diap.spa[i].createLabel();
					} else {
						/* ==== zoom in ==== */
						diap.S = this;
						this.createLabel();
					}
					diap.setPosition();
				}
				s.createLabel();
				s.ondblclick = s.onclick;
				s.ondrag = function () { return false; }
				k++;
			}
		}
		this.N = NX * NY;
		/* ==== add resize event ==== */
		this.resize();
		addEvent(window, 'resize', diap.resize);
		/* ==== start main loop ==== */
		this.run();
	}
}