/* Flot plugin for rendering pie charts.
  
  Copyright (c) 2007-2013 IOLA and Ole Laursen.
  Licensed under the MIT license.
  
  The plugin assumes that each series has a single data value, and that each
  value is a positive integer or zero.  Negative numbers don't make sense for a
  pie chart, and have unpredictable results.  The values do NOT need to be
  passed in as percentages; the plugin will calculate the total and per-slice
  percentages internally.
  
  * Created by Brian Medendorp
  
  * Updated with contributions from btburnett3, Anthony Aragues and Xavi Ivars
  
  The plugin supports these options:
  
  	series: {
  		pie: {
  			show: true/false
  			radius: 0-1 for percentage of fullsize, or a specified pixel length, or 'auto'
  			innerRadius: 0-1 for percentage of fullsize or a specified pixel length, for creating a donut effect
  			startAngle: 0-2 factor of PI used for starting angle (in radians) i.e 3/2 starts at the top, 0 and 2 have the same result
  			tilt: 0-1 for percentage to tilt the pie, where 1 is no tilt, and 0 is completely flat (nothing will show)
  			offset: {
  				top: integer value to move the pie up or down
  				left: integer value to move the pie left or right, or 'auto'
  			},
  			stroke: {
  				color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#FFF')
  				width: integer pixel width of the stroke
  			},
  			label: {
  				show: true/false, or 'auto'
  				formatter:  a user-defined function that modifies the text/style of the label text
  				radius: 0-1 for percentage of fullsize, or a specified pixel length
  				background: {
  					color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#000')
  					opacity: 0-1
  				},
  				threshold: 0-1 for the percentage value at which to hide labels (if they're too small)
  			},
  			combine: {
  				threshold: 0-1 for the percentage value at which to combine slices (if they're too small)
  				color: any hexidecimal color value (other formats may or may not work, so best to stick with something like '#CCC'), if null, the plugin will automatically use the color of the first slice to be combined
  				label: any text value of what the combined slice should be labeled
  			}
  			highlight: {
  				opacity: 0-1
  			}
  		}
  	}
  
  More detail and specific examples can be found in the included HTML file.
  
  */
  
  (function($) {
  
  	// Maximum redraw attempts when fitting labels within the plot
  
  	var REDRAW_ATTEMPTS = 10;
  
  	// Factor by which to shrink the pie when fitting labels within the plot
  
  	var REDRAW_SHRINK = 0.95;
  
  	function init(plot) {
  
  		var canvas = null,
  			target = null,
  			options = null,
  			maxRadius = null,
  			centerLeft = null,
  			centerTop = null,
  			processed = false,
  			ctx = null;
  
  		// interactive variables
  
  		var highlights = [];
  
  		// add hook to determine if pie plugin in enabled, and then perform necessary operations
  
  		plot.hooks.processOptions.push(function(plot, options) {
  			if (options.series.pie.show) {
  
  				options.grid.show = false;
  
  				// set labels.show
  
  				if (options.series.pie.label.show == "auto") {
  					if (options.legend.show) {
  						options.series.pie.label.show = false;
  					} else {
  						options.series.pie.label.show = true;
  					}
  				}
  
  				// set radius
  
  				if (options.series.pie.radius == "auto") {
  					if (options.series.pie.label.show) {
  						options.series.pie.radius = 3/4;
  					} else {
  						options.series.pie.radius = 1;
  					}
  				}
  
  				// ensure sane tilt
  
  				if (options.series.pie.tilt > 1) {
  					options.series.pie.tilt = 1;
  				} else if (options.series.pie.tilt < 0) {
  					options.series.pie.tilt = 0;
  				}
  			}
  		});
  
  		plot.hooks.bindEvents.push(function(plot, eventHolder) {
  			var options = plot.getOptions();
  			if (options.series.pie.show) {
  				if (options.grid.hoverable) {
  					eventHolder.unbind("mousemove").mousemove(onMouseMove);
  				}
  				if (options.grid.clickable) {
  					eventHolder.unbind("click").click(onClick);
  				}
  			}
  		});
  
  		plot.hooks.processDatapoints.push(function(plot, series, data, datapoints) {
  			var options = plot.getOptions();
  			if (options.series.pie.show) {
  				processDatapoints(plot, series, data, datapoints);
  			}
  		});
  
  		plot.hooks.drawOverlay.push(function(plot, octx) {
  			var options = plot.getOptions();
  			if (options.series.pie.show) {
  				drawOverlay(plot, octx);
  			}
  		});
  
  		plot.hooks.draw.push(function(plot, newCtx) {
  			var options = plot.getOptions();
  			if (options.series.pie.show) {
  				draw(plot, newCtx);
  			}
  		});
  
  		function processDatapoints(plot, series, datapoints) {
  			if (!processed)	{
  				processed = true;
  				canvas = plot.getCanvas();
  				target = $(canvas).parent();
  				options = plot.getOptions();
  				plot.setData(combine(plot.getData()));
  			}
  		}
  
  		function combine(data) {
  
  			var total = 0,
  				combined = 0,
  				numCombined = 0,
  				color = options.series.pie.combine.color,
  				newdata = [];
  
  			// Fix up the raw data from Flot, ensuring the data is numeric
  
  			for (var i = 0; i < data.length; ++i) {
  
  				var value = data[i].data;
  
  				// If the data is an array, we'll assume that it's a standard
  				// Flot x-y pair, and are concerned only with the second value.
  
  				// Note how we use the original array, rather than creating a
  				// new one; this is more efficient and preserves any extra data
  				// that the user may have stored in higher indexes.
  
  				if ($.isArray(value) && value.length == 1) {
      				value = value[0];
  				}
  
  				if ($.isArray(value)) {
  					// Equivalent to $.isNumeric() but compatible with jQuery < 1.7
  					if (!isNaN(parseFloat(value[1])) && isFinite(value[1])) {
  						value[1] = +value[1];
  					} else {
  						value[1] = 0;
  					}
  				} else if (!isNaN(parseFloat(value)) && isFinite(value)) {
  					value = [1, +value];
  				} else {
  					value = [1, 0];
  				}
  
  				data[i].data = [value];
  			}
  
  			// Sum up all the slices, so we can calculate percentages for each
  
  			for (var i = 0; i < data.length; ++i) {
  				total += data[i].data[0][1];
  			}
  
  			// Count the number of slices with percentages below the combine
  			// threshold; if it turns out to be just one, we won't combine.
  
  			for (var i = 0; i < data.length; ++i) {
  				var value = data[i].data[0][1];
  				if (value / total <= options.series.pie.combine.threshold) {
  					combined += value;
  					numCombined++;
  					if (!color) {
  						color = data[i].color;
  					}
  				}
  			}
  
  			for (var i = 0; i < data.length; ++i) {
  				var value = data[i].data[0][1];
  				if (numCombined < 2 || value / total > options.series.pie.combine.threshold) {
  					newdata.push({
  						data: [[1, value]],
  						color: data[i].color,
  						label: data[i].label,
  						angle: value * Math.PI * 2 / total,
  						percent: value / (total / 100)
  					});
  				}
  			}
  
  			if (numCombined > 1) {
  				newdata.push({
  					data: [[1, combined]],
  					color: color,
  					label: options.series.pie.combine.label,
  					angle: combined * Math.PI * 2 / total,
  					percent: combined / (total / 100)
  				});
  			}
  
  			return newdata;
  		}
  
  		function draw(plot, newCtx) {
  
  			if (!target) {
  				return; // if no series were passed
  			}
  
  			var canvasWidth = plot.getPlaceholder().width(),
  				canvasHeight = plot.getPlaceholder().height(),
  				legendWidth = target.children().filter(".legend").children().width() || 0;
  
  			ctx = newCtx;
  
  			// WARNING: HACK! REWRITE THIS CODE AS SOON AS POSSIBLE!
  
  			// When combining smaller slices into an 'other' slice, we need to
  			// add a new series.  Since Flot gives plugins no way to modify the
  			// list of series, the pie plugin uses a hack where the first call
  			// to processDatapoints results in a call to setData with the new
  			// list of series, then subsequent processDatapoints do nothing.
  
  			// The plugin-global 'processed' flag is used to control this hack;
  			// it starts out false, and is set to true after the first call to
  			// processDatapoints.
  
  			// Unfortunately this turns future setData calls into no-ops; they
  			// call processDatapoints, the flag is true, and nothing happens.
  
  			// To fix this we'll set the flag back to false here in draw, when
  			// all series have been processed, so the next sequence of calls to
  			// processDatapoints once again starts out with a slice-combine.
  			// This is really a hack; in 0.9 we need to give plugins a proper
  			// way to modify series before any processing begins.
  
  			processed = false;
  
  			// calculate maximum radius and center point
  
  			maxRadius =  Math.min(canvasWidth, canvasHeight / options.series.pie.tilt) / 2;
  			centerTop = canvasHeight / 2 + options.series.pie.offset.top;
  			centerLeft = canvasWidth / 2;
  
  			if (options.series.pie.offset.left == "auto") {
  				if (options.legend.position.match("w")) {
  					centerLeft += legendWidth / 2;
  				} else {
  					centerLeft -= legendWidth / 2;
  				}
  				if (centerLeft < maxRadius) {
  					centerLeft = maxRadius;
  				} else if (centerLeft > canvasWidth - maxRadius) {
  					centerLeft = canvasWidth - maxRadius;
  				}
  			} else {
  				centerLeft += options.series.pie.offset.left;
  			}
  
  			var slices = plot.getData(),
  				attempts = 0;
  
  			// Keep shrinking the pie's radius until drawPie returns true,
  			// indicating that all the labels fit, or we try too many times.
  
  			do {
  				if (attempts > 0) {
  					maxRadius *= REDRAW_SHRINK;
  				}
  				attempts += 1;
  				clear();
  				if (options.series.pie.tilt <= 0.8) {
  					drawShadow();
  				}
  			} while (!drawPie() && attempts < REDRAW_ATTEMPTS);
  
  			if (attempts >= REDRAW_ATTEMPTS) {
  				clear();
  				target.prepend("<div class='error'>Could not draw pie with labels contained inside canvas</div>");
  			}
  
  			if (plot.setSeries && plot.insertLegend) {
  				plot.setSeries(slices);
  				plot.insertLegend();
  			}
  
  			// we're actually done at this point, just defining internal functions at this point
  
  			function clear() {
  				ctx.clearRect(0, 0, canvasWidth, canvasHeight);
  				target.children().filter(".pieLabel, .pieLabelBackground").remove();
  			}
  
  			function drawShadow() {
  
  				var shadowLeft = options.series.pie.shadow.left;
  				var shadowTop = options.series.pie.shadow.top;
  				var edge = 10;
  				var alpha = options.series.pie.shadow.alpha;
  				var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius;
  
  				if (radius >= canvasWidth / 2 - shadowLeft || radius * options.series.pie.tilt >= canvasHeight / 2 - shadowTop || radius <= edge) {
  					return;	// shadow would be outside canvas, so don't draw it
  				}
  
  				ctx.save();
  				ctx.translate(shadowLeft,shadowTop);
  				ctx.globalAlpha = alpha;
  				ctx.fillStyle = "#000";
  
  				// center and rotate to starting position
  
  				ctx.translate(centerLeft,centerTop);
  				ctx.scale(1, options.series.pie.tilt);
  
  				//radius -= edge;
  
  				for (var i = 1; i <= edge; i++) {
  					ctx.beginPath();
  					ctx.arc(0, 0, radius, 0, Math.PI * 2, false);
  					ctx.fill();
  					radius -= i;
  				}
  
  				ctx.restore();
  			}
  
  			function drawPie() {
  
  				var startAngle = Math.PI * options.series.pie.startAngle;
  				var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius;
  
  				// center and rotate to starting position
  
  				ctx.save();
  				ctx.translate(centerLeft,centerTop);
  				ctx.scale(1, options.series.pie.tilt);
  				//ctx.rotate(startAngle); // start at top; -- This doesn't work properly in Opera
  
  				// draw slices
  
  				ctx.save();
  				var currentAngle = startAngle;
  				for (var i = 0; i < slices.length; ++i) {
  					slices[i].startAngle = currentAngle;
  					drawSlice(slices[i].angle, slices[i].color, true);
  				}
  				ctx.restore();
  
  				// draw slice outlines
  
  				if (options.series.pie.stroke.width > 0) {
  					ctx.save();
  					ctx.lineWidth = options.series.pie.stroke.width;
  					currentAngle = startAngle;
  					for (var i = 0; i < slices.length; ++i) {
  						drawSlice(slices[i].angle, options.series.pie.stroke.color, false);
  					}
  					ctx.restore();
  				}
  
  				// draw donut hole
  
  				drawDonutHole(ctx);
  
  				ctx.restore();
  
  				// Draw the labels, returning true if they fit within the plot
  
  				if (options.series.pie.label.show) {
  					return drawLabels();
  				} else return true;
  
  				function drawSlice(angle, color, fill) {
  
  					if (angle <= 0 || isNaN(angle)) {
  						return;
  					}
  
  					if (fill) {
  						ctx.fillStyle = color;
  					} else {
  						ctx.strokeStyle = color;
  						ctx.lineJoin = "round";
  					}
  
  					ctx.beginPath();
  					if (Math.abs(angle - Math.PI * 2) > 0.000000001) {
  						ctx.moveTo(0, 0); // Center of the pie
  					}
  
  					//ctx.arc(0, 0, radius, 0, angle, false); // This doesn't work properly in Opera
  					ctx.arc(0, 0, radius,currentAngle, currentAngle + angle / 2, false);
  					ctx.arc(0, 0, radius,currentAngle + angle / 2, currentAngle + angle, false);
  					ctx.closePath();
  					//ctx.rotate(angle); // This doesn't work properly in Opera
  					currentAngle += angle;
  
  					if (fill) {
  						ctx.fill();
  					} else {
  						ctx.stroke();
  					}
  				}
  
  				function drawLabels() {
  
  					var currentAngle = startAngle;
  					var radius = options.series.pie.label.radius > 1 ? options.series.pie.label.radius : maxRadius * options.series.pie.label.radius;
  
  					for (var i = 0; i < slices.length; ++i) {
  						if (slices[i].percent >= options.series.pie.label.threshold * 100) {
  							if (!drawLabel(slices[i], currentAngle, i)) {
  								return false;
  							}
  						}
  						currentAngle += slices[i].angle;
  					}
  
  					return true;
  
  					function drawLabel(slice, startAngle, index) {
  
  						if (slice.data[0][1] == 0) {
  							return true;
  						}
  
  						// format label text
  
  						var lf = options.legend.labelFormatter, text, plf = options.series.pie.label.formatter;
  
  						if (lf) {
  							text = lf(slice.label, slice);
  						} else {
  							text = slice.label;
  						}
  
  						if (plf) {
  							text = plf(text, slice);
  						}
  
  						var halfAngle = ((startAngle + slice.angle) + startAngle) / 2;
  						var x = centerLeft + Math.round(Math.cos(halfAngle) * radius);
  						var y = centerTop + Math.round(Math.sin(halfAngle) * radius) * options.series.pie.tilt;
  
  						var html = "<span class='pieLabel' id='pieLabel" + index + "' style='position:absolute;top:" + y + "px;left:" + x + "px;'>" + text + "</span>";
  						target.append(html);
  
  						var label = target.children("#pieLabel" + index);
  						var labelTop = (y - label.height() / 2);
  						var labelLeft = (x - label.width() / 2);
  
  						label.css("top", labelTop);
  						label.css("left", labelLeft);
  
  						// check to make sure that the label is not outside the canvas
  
  						if (0 - labelTop > 0 || 0 - labelLeft > 0 || canvasHeight - (labelTop + label.height()) < 0 || canvasWidth - (labelLeft + label.width()) < 0) {
  							return false;
  						}
  
  						if (options.series.pie.label.background.opacity != 0) {
  
  							// put in the transparent background separately to avoid blended labels and label boxes
  
  							var c = options.series.pie.label.background.color;
  
  							if (c == null) {
  								c = slice.color;
  							}
  
  							var pos = "top:" + labelTop + "px;left:" + labelLeft + "px;";
  							$("<div class='pieLabelBackground' style='position:absolute;width:" + label.width() + "px;height:" + label.height() + "px;" + pos + "background-color:" + c + ";'></div>")
  								.css("opacity", options.series.pie.label.background.opacity)
  								.insertBefore(label);
  						}
  
  						return true;
  					} // end individual label function
  				} // end drawLabels function
  			} // end drawPie function
  		} // end draw function
  
  		// Placed here because it needs to be accessed from multiple locations
  
  		function drawDonutHole(layer) {
  			if (options.series.pie.innerRadius > 0) {
  
  				// subtract the center
  
  				layer.save();
  				var innerRadius = options.series.pie.innerRadius > 1 ? options.series.pie.innerRadius : maxRadius * options.series.pie.innerRadius;
  				layer.globalCompositeOperation = "destination-out"; // this does not work with excanvas, but it will fall back to using the stroke color
  				layer.beginPath();
  				layer.fillStyle = options.series.pie.stroke.color;
  				layer.arc(0, 0, innerRadius, 0, Math.PI * 2, false);
  				layer.fill();
  				layer.closePath();
  				layer.restore();
  
  				// add inner stroke
  
  				layer.save();
  				layer.beginPath();
  				layer.strokeStyle = options.series.pie.stroke.color;
  				layer.arc(0, 0, innerRadius, 0, Math.PI * 2, false);
  				layer.stroke();
  				layer.closePath();
  				layer.restore();
  
  				// TODO: add extra shadow inside hole (with a mask) if the pie is tilted.
  			}
  		}
  
  		//-- Additional Interactive related functions --
  
  		function isPointInPoly(poly, pt) {
  			for(var c = false, i = -1, l = poly.length, j = l - 1; ++i < l; j = i)
  				((poly[i][1] <= pt[1] && pt[1] < poly[j][1]) || (poly[j][1] <= pt[1] && pt[1]< poly[i][1]))
  				&& (pt[0] < (poly[j][0] - poly[i][0]) * (pt[1] - poly[i][1]) / (poly[j][1] - poly[i][1]) + poly[i][0])
  				&& (c = !c);
  			return c;
  		}
  
  		function findNearbySlice(mouseX, mouseY) {
  
  			var slices = plot.getData(),
  				options = plot.getOptions(),
  				radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius,
  				x, y;
  
  			for (var i = 0; i < slices.length; ++i) {
  
  				var s = slices[i];
  
  				if (s.pie.show) {
  
  					ctx.save();
  					ctx.beginPath();
  					ctx.moveTo(0, 0); // Center of the pie
  					//ctx.scale(1, options.series.pie.tilt);	// this actually seems to break everything when here.
  					ctx.arc(0, 0, radius, s.startAngle, s.startAngle + s.angle / 2, false);
  					ctx.arc(0, 0, radius, s.startAngle + s.angle / 2, s.startAngle + s.angle, false);
  					ctx.closePath();
  					x = mouseX - centerLeft;
  					y = mouseY - centerTop;
  
  					if (ctx.isPointInPath) {
  						if (ctx.isPointInPath(mouseX - centerLeft, mouseY - centerTop)) {
  							ctx.restore();
  							return {
  								datapoint: [s.percent, s.data],
  								dataIndex: 0,
  								series: s,
  								seriesIndex: i
  							};
  						}
  					} else {
  
  						// excanvas for IE doesn;t support isPointInPath, this is a workaround.
  
  						var p1X = radius * Math.cos(s.startAngle),
  							p1Y = radius * Math.sin(s.startAngle),
  							p2X = radius * Math.cos(s.startAngle + s.angle / 4),
  							p2Y = radius * Math.sin(s.startAngle + s.angle / 4),
  							p3X = radius * Math.cos(s.startAngle + s.angle / 2),
  							p3Y = radius * Math.sin(s.startAngle + s.angle / 2),
  							p4X = radius * Math.cos(s.startAngle + s.angle / 1.5),
  							p4Y = radius * Math.sin(s.startAngle + s.angle / 1.5),
  							p5X = radius * Math.cos(s.startAngle + s.angle),
  							p5Y = radius * Math.sin(s.startAngle + s.angle),
  							arrPoly = [[0, 0], [p1X, p1Y], [p2X, p2Y], [p3X, p3Y], [p4X, p4Y], [p5X, p5Y]],
  							arrPoint = [x, y];
  
  						// TODO: perhaps do some mathmatical trickery here with the Y-coordinate to compensate for pie tilt?
  
  						if (isPointInPoly(arrPoly, arrPoint)) {
  							ctx.restore();
  							return {
  								datapoint: [s.percent, s.data],
  								dataIndex: 0,
  								series: s,
  								seriesIndex: i
  							};
  						}
  					}
  
  					ctx.restore();
  				}
  			}
  
  			return null;
  		}
  
  		function onMouseMove(e) {
  			triggerClickHoverEvent("plothover", e);
  		}
  
  		function onClick(e) {
  			triggerClickHoverEvent("plotclick", e);
  		}
  
  		// trigger click or hover event (they send the same parameters so we share their code)
  
  		function triggerClickHoverEvent(eventname, e) {
  
  			var offset = plot.offset();
  			var canvasX = parseInt(e.pageX - offset.left);
  			var canvasY =  parseInt(e.pageY - offset.top);
  			var item = findNearbySlice(canvasX, canvasY);
  
  			if (options.grid.autoHighlight) {
  
  				// clear auto-highlights
  
  				for (var i = 0; i < highlights.length; ++i) {
  					var h = highlights[i];
  					if (h.auto == eventname && !(item && h.series == item.series)) {
  						unhighlight(h.series);
  					}
  				}
  			}
  
  			// highlight the slice
  
  			if (item) {
  				highlight(item.series, eventname);
  			}
  
  			// trigger any hover bind events
  
  			var pos = { pageX: e.pageX, pageY: e.pageY };
  			target.trigger(eventname, [pos, item]);
  		}
  
  		function highlight(s, auto) {
  			//if (typeof s == "number") {
  			//	s = series[s];
  			//}
  
  			var i = indexOfHighlight(s);
  
  			if (i == -1) {
  				highlights.push({ series: s, auto: auto });
  				plot.triggerRedrawOverlay();
  			} else if (!auto) {
  				highlights[i].auto = false;
  			}
  		}
  
  		function unhighlight(s) {
  			if (s == null) {
  				highlights = [];
  				plot.triggerRedrawOverlay();
  			}
  
  			//if (typeof s == "number") {
  			//	s = series[s];
  			//}
  
  			var i = indexOfHighlight(s);
  
  			if (i != -1) {
  				highlights.splice(i, 1);
  				plot.triggerRedrawOverlay();
  			}
  		}
  
  		function indexOfHighlight(s) {
  			for (var i = 0; i < highlights.length; ++i) {
  				var h = highlights[i];
  				if (h.series == s)
  					return i;
  			}
  			return -1;
  		}
  
  		function drawOverlay(plot, octx) {
  
  			var options = plot.getOptions();
  
  			var radius = options.series.pie.radius > 1 ? options.series.pie.radius : maxRadius * options.series.pie.radius;
  
  			octx.save();
  			octx.translate(centerLeft, centerTop);
  			octx.scale(1, options.series.pie.tilt);
  
  			for (var i = 0; i < highlights.length; ++i) {
  				drawHighlight(highlights[i].series);
  			}
  
  			drawDonutHole(octx);
  
  			octx.restore();
  
  			function drawHighlight(series) {
  
  				if (series.angle <= 0 || isNaN(series.angle)) {
  					return;
  				}
  
  				//octx.fillStyle = parseColor(options.series.pie.highlight.color).scale(null, null, null, options.series.pie.highlight.opacity).toString();
  				octx.fillStyle = "rgba(255, 255, 255, " + options.series.pie.highlight.opacity + ")"; // this is temporary until we have access to parseColor
  				octx.beginPath();
  				if (Math.abs(series.angle - Math.PI * 2) > 0.000000001) {
  					octx.moveTo(0, 0); // Center of the pie
  				}
  				octx.arc(0, 0, radius, series.startAngle, series.startAngle + series.angle / 2, false);
  				octx.arc(0, 0, radius, series.startAngle + series.angle / 2, series.startAngle + series.angle, false);
  				octx.closePath();
  				octx.fill();
  			}
  		}
  	} // end init (plugin body)
  
  	// define pie specific options and their default values
  
  	var options = {
  		series: {
  			pie: {
  				show: false,
  				radius: "auto",	// actual radius of the visible pie (based on full calculated radius if <=1, or hard pixel value)
  				innerRadius: 0, /* for donut */
  				startAngle: 3/2,
  				tilt: 1,
  				shadow: {
  					left: 5,	// shadow left offset
  					top: 15,	// shadow top offset
  					alpha: 0.02	// shadow alpha
  				},
  				offset: {
  					top: 0,
  					left: "auto"
  				},
  				stroke: {
  					color: "#fff",
  					width: 1
  				},
  				label: {
  					show: "auto",
  					formatter: function(label, slice) {
  						return "<div style='font-size:x-small;text-align:center;padding:2px;color:" + slice.color + ";'>" + label + "<br/>" + Math.round(slice.percent) + "%</div>";
  					},	// formatter function
  					radius: 1,	// radius at which to place the labels (based on full calculated radius if <=1, or hard pixel value)
  					background: {
  						color: null,
  						opacity: 0
  					},
  					threshold: 0	// percentage at which to hide the label (i.e. the slice is too narrow)
  				},
  				combine: {
  					threshold: -1,	// percentage at which to combine little slices into one larger slice
  					color: null,	// color to give the new slice (auto-generated if null)
  					label: "Other"	// label to give the new slice
  				},
  				highlight: {
  					//color: "#fff",		// will add this functionality once parseColor is available
  					opacity: 0.5
  				}
  			}
  		}
  	};
  
  	$.plot.plugins.push({
  		init: init,
  		options: options,
  		name: "pie",
  		version: "1.1"
  	});
  
  })(jQuery);