function PieChart () {
	var colors = ["#00a651", "#f66", "#00aeef", "#a67c52", "#ffcc00", "#662d91", "#8dc63f", "#92278f", "#f7941d", "#0054a6", "#ccc"],
		 items = [],
		titles = [],
		   sum = 0,
		labels = [],
		 title = 0, //0 - digits, 1 - percent, 2 - titles
		   div = null,
			 S = 15;
	this.start = 0; //deg
	this.sum = 0;
	this.setValues = function(){
		items = [];
		titles = [];
		labels = [];
		if (typeof this.setValues.arguments[0] == "object" && this.setValues.arguments[0].length) {
			items = this.setValues.arguments[0];
			if (typeof this.setValues.arguments[1] == "object" && this.setValues.arguments[1].length) {
				titles = this.setValues.arguments[1];
			}
			if (typeof this.setValues.arguments[1] == "string") {
				titles = eval('["' + this.setValues.arguments[1].replace(/,/g, '","') + '"]');
			}
		} else {
			for (var i = 0; i < this.setValues.arguments.length; i++) {
				items[i] = this.setValues.arguments[i]
			}
		}
		if (!titles.length && title > 1) {
			title = 0;
		}
		this.redraw();
	};
	
	
	this.printTo = function(divid){
		div = document.getElementById(divid);
		if (!div) {
			return false;
		}
		build(this.start);
	};
	
	
	this.redraw = function(){
		if (div) {
			var divs = div.getElementsByTagName("div");
			while (divs.length) {
				div.removeChild(divs[0]);
			}
			build(this.start);
		}
	};
	
	
	this.rotate = function(angle) {
		angle = this.start + angle;
		angle = angle % 360;
		if (angle < 0) {
			angle = 360 + angle;
		}
		this.start = angle;
		this.redraw();
	};
	
	
	this.setTitle = function(newtitle){
		if (newtitle > 2) {
			newtitle = 0;
		}
		title = newtitle;
		if (title > 1 && !titles.length) {
			title = 0;
		}
		var pc = sum / 100;
		for (var i = 0, j = items.length; i < j; i++) {
			switch (title) {
				case 0 : labels[i].nodeValue = items[i]; break;
				case 1 : labels[i].nodeValue = Math.round(items[i] / pc * 10) / 10 + "%"; break;
				case 2 : labels[i].nodeValue = titles[i]; break;
			}
		}
	};
	
	
	this.title = function(){
		this.setTitle(title + 1);
	};
	
	
	var build = function(start){
		if (!div) {
			return;
		}
		sum = 0;
		for (var i = 0; i < items.length; i++) {
			sum += items[i];
		}
		var pc = sum / 100;
		var alpha = 2 * Math.PI / sum,
			    Q = 1,
			    q = 1,
			angle = 0,
			whole = start * Math.PI / 180,
			sigma = 0.01,
			    Z = 10;
		for (var i = 0; i < items.length; i++) {
			//labels
			var labeldiv = document.createElement("div");
			var labelspan = document.createElement("span");
			switch (title) {
				case 0 : var labeltext = items[i]; break;
				case 1 : var labeltext = Math.round(items[i] / pc * 10) / 10 + "%"; break;
				case 2 : var labeltext = titles[i]; break;
			}
			
			labels[i] = document.createTextNode(labeltext);
			labelspan.appendChild(labels[i]);
			labeldiv.appendChild(labelspan);
			labeldiv.className = "pie-label";
			var labelangle = (whole + alpha * items[i] / 2) % (Math.PI * 2);
			labeldiv.style.top = (labelangle > Math.PI?1:-1) * (S / 3 * 2 * Math.abs(Math.sin(labelangle))) + "em";
			labeldiv.style.left = (labelangle < Math.PI / 2 || labelangle > Math.PI / 2 * 3?1:-1) * (S / 3 * 2 * Math.abs(Math.cos(labelangle))) + "em";
			div.appendChild(labeldiv);
			if (items[i] == 0) {
				labeldiv.style.display = "none";
			}

			var sector = document.createElement("div");
			whole += alpha * items[i];
			angle = whole - Math.PI / 2 * (Q - 1);
			while (angle > Math.PI / 2 + sigma) {
				var bg = document.createElement("div");
				bg.className = "bg sector-" + q;
				bg.style.backgroundColor = colors[i % colors.length];
				bg.style.zIndex = Z--;
				div.appendChild(bg);
				Q++;
				Z = 10 * Q;
				if (Q > 4) {
					q = Q - 4;
				} else {
					q = Q;
				}
				angle = whole - Math.PI / 2 * (Q - 1);
			}
			if (Math.abs(Math.PI / 2 - angle) <= sigma) { //almost 90 deg
				var bg = document.createElement("div");
				bg.className = "bg sector-" + q;
				bg.style.backgroundColor = colors[i % colors.length];
				bg.style.zIndex = Z--;
				div.appendChild(bg);
				Q++;
				Z = 10 * Q;
				if (Q > 4) {
					q = Q - 4;
				} else {
					q = Q;
				}
			} else {
				sector.className = "pie sector-" + q;
				var size = Math.abs(S * Math.tan(angle));
				var size2 = S;
				if (size > 0) {
					if (size > S) {
						size2 = S * Math.cos(angle) / Math.sin(angle);
						size = S;
						sector.style[[0, "width", "height", "width", "height"][q]] = S - size2 + "em";
					}
					sector.style["border" + [0, "Left", "Bottom", "Right", "Top"][q]] = "solid " + size2 + "em transparent";
					sector.style["border" + [0, "Bottom", "Right", "Top", "Left"][q]] = "solid " + size + "em " + colors[i % colors.length];
					sector.size = size;
					sector.colour = colors[i % colors.length];
					sector.style.zIndex = Z--;
					div.appendChild(sector);
				}
			}
		}
	};
}