vitro/webapp/web/js/jquery_plugins/flot/jquery.flot.js

/* Javascript plotting library for jQuery, v. 0.6.
 *
 * Released under the MIT license by IOLA, December 2007.
 *
 */

// first an inline dependency, jquery.colorhelpers.js, we inline it here
// for convenience
/* Plugin for jQuery for working with colors.
 * 
 * Version 1.0.
 * 
 * Inspiration from jQuery color animation plugin by John Resig.
 *
 * Released under the MIT license by Ole Laursen, October 2009.
 *
 * Examples:
 *
 *   $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
 *   var c = $.color.extract($("#mydiv"), 'background-color');
 *   console.log(c.r, c.g, c.b, c.a);
 *   $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
 *
 * Note that .scale() and .add() work in-place instead of returning
 * new objects.
 */
(function() {
	jQuery.color = {};
	jQuery.color.make = function(E, D, B, C) {
		var F = {};
		F.r = E || 0;
		F.g = D || 0;
		F.b = B || 0;
		F.a = C != null ? C : 1;
		F.add = function(I, H) {
			for ( var G = 0; G < I.length; ++G) {
				F[I.charAt(G)] += H
			}
			return F.normalize()
		};
		F.scale = function(I, H) {
			for ( var G = 0; G < I.length; ++G) {
				F[I.charAt(G)] *= H
			}
			return F.normalize()
		};
		F.toString = function() {
			if (F.a >= 1) {
				return "rgb(" + [ F.r, F.g, F.b ].join(",") + ")"
			} else {
				return "rgba(" + [ F.r, F.g, F.b, F.a ].join(",") + ")"
			}
		};
		F.normalize = function() {
			function G(I, J, H) {
				return J < I ? I : (J > H ? H : J)
			}
			F.r = G(0, parseInt(F.r), 255);
			F.g = G(0, parseInt(F.g), 255);
			F.b = G(0, parseInt(F.b), 255);
			F.a = G(0, F.a, 1);
			return F
		};
		F.clone = function() {
			return jQuery.color.make(F.r, F.b, F.g, F.a)
		};
		return F.normalize()
	};
	jQuery.color.extract = function(C, B) {
		var D;
		do {
			D = C.css(B).toLowerCase();
			if (D != "" && D != "transparent") {
				break
			}
			C = C.parent()
		} while (!jQuery.nodeName(C.get(0), "body"));
		if (D == "rgba(0, 0, 0, 0)") {
			D = "transparent"
		}
		return jQuery.color.parse(D)
	};
	jQuery.color.parse = function(E) {
		var D, B = jQuery.color.make;
		if (D = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/
				.exec(E)) {
			return B(parseInt(D[1], 10), parseInt(D[2], 10), parseInt(D[3], 10))
		}
		if (D = /rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/
				.exec(E)) {
			return B(parseInt(D[1], 10), parseInt(D[2], 10),
					parseInt(D[3], 10), parseFloat(D[4]))
		}
		if (D = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/
				.exec(E)) {
			return B(parseFloat(D[1]) * 2.55, parseFloat(D[2]) * 2.55,
					parseFloat(D[3]) * 2.55)
		}
		if (D = /rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/
				.exec(E)) {
			return B(parseFloat(D[1]) * 2.55, parseFloat(D[2]) * 2.55,
					parseFloat(D[3]) * 2.55, parseFloat(D[4]))
		}
		if (D = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(E)) {
			return B(parseInt(D[1], 16), parseInt(D[2], 16), parseInt(D[3], 16))
		}
		if (D = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(E)) {
			return B(parseInt(D[1] + D[1], 16), parseInt(D[2] + D[2], 16),
					parseInt(D[3] + D[3], 16))
		}
		var C = jQuery.trim(E).toLowerCase();
		if (C == "transparent") {
			return B(255, 255, 255, 0)
		} else {
			D = A[C];
			return B(D[0], D[1], D[2])
		}
	};
	var A = {
		aqua : [ 0, 255, 255 ],
		azure : [ 240, 255, 255 ],
		beige : [ 245, 245, 220 ],
		black : [ 0, 0, 0 ],
		blue : [ 0, 0, 255 ],
		brown : [ 165, 42, 42 ],
		cyan : [ 0, 255, 255 ],
		darkblue : [ 0, 0, 139 ],
		darkcyan : [ 0, 139, 139 ],
		darkgrey : [ 169, 169, 169 ],
		darkgreen : [ 0, 100, 0 ],
		darkkhaki : [ 189, 183, 107 ],
		darkmagenta : [ 139, 0, 139 ],
		darkolivegreen : [ 85, 107, 47 ],
		darkorange : [ 255, 140, 0 ],
		darkorchid : [ 153, 50, 204 ],
		darkred : [ 139, 0, 0 ],
		darksalmon : [ 233, 150, 122 ],
		darkviolet : [ 148, 0, 211 ],
		fuchsia : [ 255, 0, 255 ],
		gold : [ 255, 215, 0 ],
		green : [ 0, 128, 0 ],
		indigo : [ 75, 0, 130 ],
		khaki : [ 240, 230, 140 ],
		lightblue : [ 173, 216, 230 ],
		lightcyan : [ 224, 255, 255 ],
		lightgreen : [ 144, 238, 144 ],
		lightgrey : [ 211, 211, 211 ],
		lightpink : [ 255, 182, 193 ],
		lightyellow : [ 255, 255, 224 ],
		lime : [ 0, 255, 0 ],
		magenta : [ 255, 0, 255 ],
		maroon : [ 128, 0, 0 ],
		navy : [ 0, 0, 128 ],
		olive : [ 128, 128, 0 ],
		orange : [ 255, 165, 0 ],
		pink : [ 255, 192, 203 ],
		purple : [ 128, 0, 128 ],
		violet : [ 128, 0, 128 ],
		red : [ 255, 0, 0 ],
		silver : [ 192, 192, 192 ],
		white : [ 255, 255, 255 ],
		yellow : [ 255, 255, 0 ]
	}
})();

// the actual Flot code
(function($) {
	function Plot(placeholder, data_, options_, plugins) {
		// data is on the form:
		// [ series1, series2 ... ]
		// where series is either just the data as [ [x1, y1], [x2, y2], ... ]
		// or { data: [ [x1, y1], [x2, y2], ... ], label: "some label", ... }

		var series = [], options = {
			// the color theme used for graphs
			colors : [ "#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed" ],
			legend : {
				show : true,
				noColumns : 1, // number of colums in legend table
				labelFormatter : null, // fn: string -> string
				labelBoxBorderColor : "#ccc", // border color for the little
				// label boxes
				container : null, // container (as jQuery object) to put
				// legend in, null means default on top of
				// graph
				position : "ne", // position of default legend container
				// within plot
				margin : 5, // distance from grid edge to default legend
				// container within plot
				backgroundColor : null, // null means auto-detect
				backgroundOpacity : 0.85
			// set to 0 to avoid background
			},
			xaxis : {
				mode : null, // null or "time"
				transform : null, // null or f: number -> number to transform
				// axis
				inverseTransform : null, // if transform is set, this should
				// be the inverse function
				min : null, // min. value to show, null means set automatically
				max : null, // max. value to show, null means set automatically
				autoscaleMargin : null, // margin in % to add if auto-setting
				// min/max
				ticks : null, // either [1, 3] or [[1, "a"], 3] or (fn: axis
				// info -> ticks) or app. number of ticks for
				// auto-ticks
				tickFormatter : null, // fn: number -> string
				labelWidth : null, // size of tick labels in pixels
				labelHeight : null,

				// mode specific options
				tickDecimals : null, // no. of decimals, null means auto
				tickSize : null, // number or [number, "unit"]
				minTickSize : null, // number or [number, "unit"]
				monthNames : null, // list of names of months
				timeformat : null, // format string to use
				twelveHourClock : false
			// 12 or 24 time in time mode
			},
			yaxis : {
				autoscaleMargin : 0.02
			},
			x2axis : {
				autoscaleMargin : null
			},
			y2axis : {
				autoscaleMargin : 0.02
			},
			series : {
				points : {
					show : false,
					radius : 3,
					lineWidth : 2, // in pixels
					fill : true,
					fillColor : "#ffffff"
				},
				lines : {
					// we don't put in show: false so we can see
					// whether lines were actively disabled
					lineWidth : 2, // in pixels
					fill : false,
					fillColor : null,
					steps : false
				},
				bars : {
					show : false,
					lineWidth : 2, // in pixels
					barWidth : 1, // in units of the x axis
					fill : true,
					fillColor : null,
					align : "left", // or "center"
					horizontal : false
				// when horizontal, left is now top
				},
				shadowSize : 3
			},
			grid : {
				show : true,
				aboveData : false,
				color : "#545454", // primary color used for outline and labels
				backgroundColor : null, // null for transparent, else color
				tickColor : "rgba(0,0,0,0.15)", // color used for the ticks
				labelMargin : 5, // in pixels
				borderWidth : 2, // in pixels
				borderColor : null, // set if different from the grid color
				markings : null, // array of ranges or fn: axes -> array of
				// ranges
				markingsColor : "#f4f4f4",
				markingsLineWidth : 2,
				// interactive stuff
				clickable : false,
				hoverable : false,
				autoHighlight : true, // highlight in case mouse is near
				mouseActiveRadius : 10
			// how far the mouse can be away to activate an item
			},
			hooks : {}
		}, canvas = null, // the canvas for the plot itself
		overlay = null, // canvas for interactive stuff on top of plot
		eventHolder = null, // jQuery object that events should be bound to
		ctx = null, octx = null, axes = {
			xaxis : {},
			yaxis : {},
			x2axis : {},
			y2axis : {}
		}, plotOffset = {
			left : 0,
			right : 0,
			top : 0,
			bottom : 0
		}, canvasWidth = 0, canvasHeight = 0, plotWidth = 0, plotHeight = 0, hooks = {
			processOptions : [],
			processRawData : [],
			processDatapoints : [],
			draw : [],
			bindEvents : [],
			drawOverlay : []
		}, plot = this;

		// public functions
		plot.setData = setData;
		plot.setupGrid = setupGrid;
		plot.draw = draw;
		plot.getPlaceholder = function() {
			return placeholder;
		};
		plot.getCanvas = function() {
			return canvas;
		};
		plot.getPlotOffset = function() {
			return plotOffset;
		};
		plot.width = function() {
			return plotWidth;
		};
		plot.height = function() {
			return plotHeight;
		};
		plot.offset = function() {
			var o = eventHolder.offset();
			o.left += plotOffset.left;
			o.top += plotOffset.top;
			return o;
		};
		plot.getData = function() {
			return series;
		};
		plot.getAxes = function() {
			return axes;
		};
		plot.getOptions = function() {
			return options;
		};
		plot.highlight = highlight;
		plot.unhighlight = unhighlight;
		plot.triggerRedrawOverlay = triggerRedrawOverlay;
		plot.pointOffset = function(point) {
			return {
				left : parseInt(axisSpecToRealAxis(point, "xaxis")
						.p2c(+point.x)
						+ plotOffset.left),
				top : parseInt(axisSpecToRealAxis(point, "yaxis").p2c(+point.y)
						+ plotOffset.top)
			};
		};

		// public attributes
		plot.hooks = hooks;

		// initialize
		initPlugins(plot);
		parseOptions(options_);
		constructCanvas();
		setData(data_);
		setupGrid();
		draw();
		bindEvents();

		function executeHooks(hook, args) {
			args = [ plot ].concat(args);
			for ( var i = 0; i < hook.length; ++i)
				hook[i].apply(this, args);
		}

		function initPlugins() {
			for ( var i = 0; i < plugins.length; ++i) {
				var p = plugins[i];
				p.init(plot);
				if (p.options)
					$.extend(true, options, p.options);
			}
		}

		function parseOptions(opts) {
			$.extend(true, options, opts);
			if (options.grid.borderColor == null)
				options.grid.borderColor = options.grid.color;
			// backwards compatibility, to be removed in future
			if (options.xaxis.noTicks && options.xaxis.ticks == null)
				options.xaxis.ticks = options.xaxis.noTicks;
			if (options.yaxis.noTicks && options.yaxis.ticks == null)
				options.yaxis.ticks = options.yaxis.noTicks;
			if (options.grid.coloredAreas)
				options.grid.markings = options.grid.coloredAreas;
			if (options.grid.coloredAreasColor)
				options.grid.markingsColor = options.grid.coloredAreasColor;
			if (options.lines)
				$.extend(true, options.series.lines, options.lines);
			if (options.points)
				$.extend(true, options.series.points, options.points);
			if (options.bars)
				$.extend(true, options.series.bars, options.bars);
			if (options.shadowSize)
				options.series.shadowSize = options.shadowSize;

			for ( var n in hooks)
				if (options.hooks[n] && options.hooks[n].length)
					hooks[n] = hooks[n].concat(options.hooks[n]);

			executeHooks(hooks.processOptions, [ options ]);
		}

		function setData(d) {
			series = parseData(d);
			fillInSeriesOptions();
			processData();
		}

		function parseData(d) {
			var res = [];
			for ( var i = 0; i < d.length; ++i) {
				var s = $.extend(true, {}, options.series);

				if (d[i].data) {
					s.data = d[i].data; // move the data instead of deep-copy
					delete d[i].data;

					$.extend(true, s, d[i]);

					d[i].data = s.data;
				} else
					s.data = d[i];
				res.push(s);
			}

			return res;
		}

		function axisSpecToRealAxis(obj, attr) {
			var a = obj[attr];
			if (!a || a == 1)
				return axes[attr];
			if (typeof a == "number")
				return axes[attr.charAt(0) + a + attr.slice(1)];
			return a; // assume it's OK
		}

		function fillInSeriesOptions() {
			var i;

			// collect what we already got of colors
			var neededColors = series.length, usedColors = [], assignedColors = [];
			for (i = 0; i < series.length; ++i) {
				var sc = series[i].color;
				if (sc != null) {
					--neededColors;
					if (typeof sc == "number")
						assignedColors.push(sc);
					else
						usedColors.push($.color.parse(series[i].color));
				}
			}

			// we might need to generate more colors if higher indices
			// are assigned
			for (i = 0; i < assignedColors.length; ++i) {
				neededColors = Math.max(neededColors, assignedColors[i] + 1);
			}

			// produce colors as needed
			var colors = [], variation = 0;
			i = 0;
			while (colors.length < neededColors) {
				var c;
				if (options.colors.length == i) // check degenerate case
					c = $.color.make(100, 100, 100);
				else
					c = $.color.parse(options.colors[i]);

				// vary color if needed
				var sign = variation % 2 == 1 ? -1 : 1;
				c.scale('rgb', 1 + sign * Math.ceil(variation / 2) * 0.2)

				// FIXME: if we're getting to close to something else,
				// we should probably skip this one
				colors.push(c);

				++i;
				if (i >= options.colors.length) {
					i = 0;
					++variation;
				}
			}

			// fill in the options
			var colori = 0, s;
			for (i = 0; i < series.length; ++i) {
				s = series[i];

				// assign colors
				if (s.color == null) {
					s.color = colors[colori].toString();
					++colori;
				} else if (typeof s.color == "number")
					s.color = colors[s.color].toString();

				// turn on lines automatically in case nothing is set
				if (s.lines.show == null) {
					var v, show = true;
					for (v in s)
						if (s[v].show) {
							show = false;
							break;
						}
					if (show)
						s.lines.show = true;
				}

				// setup axes
				s.xaxis = axisSpecToRealAxis(s, "xaxis");
				s.yaxis = axisSpecToRealAxis(s, "yaxis");
			}
		}

		function processData() {
			var topSentry = Number.POSITIVE_INFINITY, bottomSentry = Number.NEGATIVE_INFINITY, i, j, k, m, length, s, points, ps, x, y, axis, val, f, p;

			for (axis in axes) {
				axes[axis].datamin = topSentry;
				axes[axis].datamax = bottomSentry;
				axes[axis].used = false;
			}

			function updateAxis(axis, min, max) {
				if (min < axis.datamin)
					axis.datamin = min;
				if (max > axis.datamax)
					axis.datamax = max;
			}

			for (i = 0; i < series.length; ++i) {
				s = series[i];
				s.datapoints = {
					points : []
				};

				executeHooks(hooks.processRawData, [ s, s.data, s.datapoints ]);
			}

			// first pass: clean and copy data
			for (i = 0; i < series.length; ++i) {
				s = series[i];

				var data = s.data, format = s.datapoints.format;

				if (!format) {
					format = [];
					// find out how to copy
					format.push( {
						x : true,
						number : true,
						required : true
					});
					format.push( {
						y : true,
						number : true,
						required : true
					});

					if (s.bars.show)
						format.push( {
							y : true,
							number : true,
							required : false,
							defaultValue : 0
						});

					s.datapoints.format = format;
				}

				if (s.datapoints.pointsize != null)
					continue; // already filled in

				if (s.datapoints.pointsize == null)
					s.datapoints.pointsize = format.length;

				ps = s.datapoints.pointsize;
				points = s.datapoints.points;

				insertSteps = s.lines.show && s.lines.steps;
				s.xaxis.used = s.yaxis.used = true;

				for (j = k = 0; j < data.length; ++j, k += ps) {
					p = data[j];

					var nullify = p == null;
					if (!nullify) {
						for (m = 0; m < ps; ++m) {
							val = p[m];
							f = format[m];

							if (f) {
								if (f.number && val != null) {
									val = +val; // convert to number
									if (isNaN(val))
										val = null;
								}

								if (val == null) {
									if (f.required)
										nullify = true;

									if (f.defaultValue != null)
										val = f.defaultValue;
								}
							}

							points[k + m] = val;
						}
					}

					if (nullify) {
						for (m = 0; m < ps; ++m) {
							val = points[k + m];
							if (val != null) {
								f = format[m];
								// extract min/max info
								if (f.x)
									updateAxis(s.xaxis, val, val);
								if (f.y)
									updateAxis(s.yaxis, val, val);
							}
							points[k + m] = null;
						}
					} else {
						// a little bit of line specific stuff that
						// perhaps shouldn't be here, but lacking
						// better means...
						if (insertSteps && k > 0 && points[k - ps] != null
								&& points[k - ps] != points[k]
								&& points[k - ps + 1] != points[k + 1]) {
							// copy the point to make room for a middle point
							for (m = 0; m < ps; ++m)
								points[k + ps + m] = points[k + m];

							// middle point has same y
							points[k + 1] = points[k - ps + 1];

							// we've added a point, better reflect that
							k += ps;
						}
					}
				}
			}

			// give the hooks a chance to run
			for (i = 0; i < series.length; ++i) {
				s = series[i];

				executeHooks(hooks.processDatapoints, [ s, s.datapoints ]);
			}

			// second pass: find datamax/datamin for auto-scaling
			for (i = 0; i < series.length; ++i) {
				s = series[i];
				points = s.datapoints.points, ps = s.datapoints.pointsize;

				var xmin = topSentry, ymin = topSentry, xmax = bottomSentry, ymax = bottomSentry;

				for (j = 0; j < points.length; j += ps) {
					if (points[j] == null)
						continue;

					for (m = 0; m < ps; ++m) {
						val = points[j + m];
						f = format[m];
						if (!f)
							continue;

						if (f.x) {
							if (val < xmin)
								xmin = val;
							if (val > xmax)
								xmax = val;
						}
						if (f.y) {
							if (val < ymin)
								ymin = val;
							if (val > ymax)
								ymax = val;
						}
					}
				}

				if (s.bars.show) {
					// make sure we got room for the bar on the dancing floor
					var delta = s.bars.align == "left" ? 0
							: -s.bars.barWidth / 2;
					if (s.bars.horizontal) {
						ymin += delta;
						ymax += delta + s.bars.barWidth;
					} else {
						xmin += delta;
						xmax += delta + s.bars.barWidth;
					}
				}

				updateAxis(s.xaxis, xmin, xmax);
				updateAxis(s.yaxis, ymin, ymax);
			}

			for (axis in axes) {
				if (axes[axis].datamin == topSentry)
					axes[axis].datamin = null;
				if (axes[axis].datamax == bottomSentry)
					axes[axis].datamax = null;
			}
		}

		function constructCanvas() {
			function makeCanvas(width, height) {
				var c = document.createElement('canvas');
				c.width = width;
				c.height = height;
				if ($.browser.msie) // excanvas hack
					c = window.G_vmlCanvasManager.initElement(c);
				return c;
			}

			canvasWidth = placeholder.width();
			canvasHeight = placeholder.height();
			placeholder.html(""); // clear placeholder
			if (placeholder.css("position") == 'static')
				placeholder.css("position", "relative"); // for positioning
			// labels and
			// overlay

			if (canvasWidth <= 0 || canvasHeight <= 0)
				throw "Invalid dimensions for plot, width = " + canvasWidth
						+ ", height = " + canvasHeight;

			if ($.browser.msie) // excanvas hack
				window.G_vmlCanvasManager.init_(document); // make sure
			// everything is
			// setup

			// the canvas
			canvas = $(makeCanvas(canvasWidth, canvasHeight)).appendTo(
					placeholder).get(0);
			ctx = canvas.getContext("2d");

			// overlay canvas for interactive features
			overlay = $(makeCanvas(canvasWidth, canvasHeight)).css( {
				position : 'absolute',
				left : 0,
				top : 0
			}).appendTo(placeholder).get(0);
			octx = overlay.getContext("2d");
			octx.stroke();
		}

		function bindEvents() {
			// we include the canvas in the event holder too, because IE 7
			// sometimes has trouble with the stacking order
			eventHolder = $( [ overlay, canvas ]);

			// bind events
			if (options.grid.hoverable)
				eventHolder.mousemove(onMouseMove);

			if (options.grid.clickable)
				eventHolder.click(onClick);

			executeHooks(hooks.bindEvents, [ eventHolder ]);
		}

		function setupGrid() {
			function setTransformationHelpers(axis, o) {
				function identity(x) {
					return x;
				}

				var s, m, t = o.transform || identity, it = o.inverseTransform;

				// add transformation helpers
				if (axis == axes.xaxis || axis == axes.x2axis) {
					// precompute how much the axis is scaling a point
					// in canvas space
					s = axis.scale = plotWidth / (t(axis.max) - t(axis.min));
					m = t(axis.min);

					// data point to canvas coordinate
					if (t == identity) // slight optimization
						axis.p2c = function(p) {
							return (p - m) * s;
						};
					else
						axis.p2c = function(p) {
							return (t(p) - m) * s;
						};
					// canvas coordinate to data point
					if (!it)
						axis.c2p = function(c) {
							return m + c / s;
						};
					else
						axis.c2p = function(c) {
							return it(m + c / s);
						};
				} else {
					s = axis.scale = plotHeight / (t(axis.max) - t(axis.min));
					m = t(axis.max);

					if (t == identity)
						axis.p2c = function(p) {
							return (m - p) * s;
						};
					else
						axis.p2c = function(p) {
							return (m - t(p)) * s;
						};
					if (!it)
						axis.c2p = function(c) {
							return m - c / s;
						};
					else
						axis.c2p = function(c) {
							return it(m - c / s);
						};
				}
			}

			function measureLabels(axis, axisOptions) {
				var i, labels = [], l;

				axis.labelWidth = axisOptions.labelWidth;
				axis.labelHeight = axisOptions.labelHeight;

				if (axis == axes.xaxis || axis == axes.x2axis) {
					// to avoid measuring the widths of the labels, we
					// construct fixed-size boxes and put the labels inside
					// them, we don't need the exact figures and the
					// fixed-size box content is easy to center
					if (axis.labelWidth == null)
						axis.labelWidth = canvasWidth
								/ (axis.ticks.length > 0 ? axis.ticks.length
										: 1);

					// measure x label heights
					if (axis.labelHeight == null) {
						labels = [];
						for (i = 0; i < axis.ticks.length; ++i) {
							l = axis.ticks[i].label;
							if (l)
								labels
										.push('<div class="tickLabel" style="float:left;width:'
												+ axis.labelWidth
												+ 'px">'
												+ l
												+ '</div>');
						}

						if (labels.length > 0) {
							var dummyDiv = $(
									'<div style="position:absolute;top:-10000px;width:10000px;font-size:smaller">'
											+ labels.join("")
											+ '<div style="clear:left"></div></div>')
									.appendTo(placeholder);
							axis.labelHeight = dummyDiv.height();
							dummyDiv.remove();
						}
					}
				} else if (axis.labelWidth == null || axis.labelHeight == null) {
					// calculate y label dimensions
					for (i = 0; i < axis.ticks.length; ++i) {
						l = axis.ticks[i].label;
						if (l)
							labels.push('<div class="tickLabel">' + l
									+ '</div>');
					}

					if (labels.length > 0) {
						var dummyDiv = $(
								'<div style="position:absolute;top:-10000px;font-size:smaller">'
										+ labels.join("") + '</div>').appendTo(
								placeholder);
						if (axis.labelWidth == null)
							axis.labelWidth = dummyDiv.width();
						if (axis.labelHeight == null)
							axis.labelHeight = dummyDiv.find("div").height();
						dummyDiv.remove();
					}

				}

				if (axis.labelWidth == null)
					axis.labelWidth = 0;
				if (axis.labelHeight == null)
					axis.labelHeight = 0;
			}

			function setGridSpacing() {
				// get the most space needed around the grid for things
				// that may stick out
				var maxOutset = options.grid.borderWidth;
				for (i = 0; i < series.length; ++i)
					maxOutset = Math
							.max(
									maxOutset,
									2 * (series[i].points.radius + series[i].points.lineWidth / 2));

				plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = maxOutset;

				var margin = options.grid.labelMargin
						+ options.grid.borderWidth;

				if (axes.xaxis.labelHeight > 0)
					plotOffset.bottom = Math.max(maxOutset,
							axes.xaxis.labelHeight + margin);
				if (axes.yaxis.labelWidth > 0)
					plotOffset.left = Math.max(maxOutset, axes.yaxis.labelWidth
							+ margin);
				if (axes.x2axis.labelHeight > 0)
					plotOffset.top = Math.max(maxOutset,
							axes.x2axis.labelHeight + margin);
				if (axes.y2axis.labelWidth > 0)
					plotOffset.right = Math.max(maxOutset,
							axes.y2axis.labelWidth + margin);

				plotWidth = canvasWidth - plotOffset.left - plotOffset.right;
				plotHeight = canvasHeight - plotOffset.bottom - plotOffset.top;
			}

			var axis;
			for (axis in axes)
				setRange(axes[axis], options[axis]);

			if (options.grid.show) {
				for (axis in axes) {
					prepareTickGeneration(axes[axis], options[axis]);
					setTicks(axes[axis], options[axis]);
					measureLabels(axes[axis], options[axis]);
				}

				setGridSpacing();
			} else {
				plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = 0;
				plotWidth = canvasWidth;
				plotHeight = canvasHeight;
			}

			for (axis in axes)
				setTransformationHelpers(axes[axis], options[axis]);

			if (options.grid.show)
				insertLabels();

			insertLegend();
		}

		function setRange(axis, axisOptions) {
			var min = +(axisOptions.min != null ? axisOptions.min
					: axis.datamin), max = +(axisOptions.max != null ? axisOptions.max
					: axis.datamax), delta = max - min;

			if (delta == 0.0) {
				// degenerate case
				var widen = max == 0 ? 1 : 0.01;

				if (axisOptions.min == null)
					min -= widen;
				// alway widen max if we couldn't widen min to ensure we
				// don't fall into min == max which doesn't work
				if (axisOptions.max == null || axisOptions.min != null)
					max += widen;
			} else {
				// consider autoscaling
				var margin = axisOptions.autoscaleMargin;
				if (margin != null) {
					if (axisOptions.min == null) {
						min -= delta * margin;
						// make sure we don't go below zero if all values
						// are positive
						if (min < 0 && axis.datamin != null
								&& axis.datamin >= 0)
							min = 0;
					}
					if (axisOptions.max == null) {
						max += delta * margin;
						if (max > 0 && axis.datamax != null
								&& axis.datamax <= 0)
							max = 0;
					}
				}
			}
			axis.min = min;
			axis.max = max;
		}

		function prepareTickGeneration(axis, axisOptions) {
			// estimate number of ticks
			var noTicks;
			if (typeof axisOptions.ticks == "number" && axisOptions.ticks > 0)
				noTicks = axisOptions.ticks;
			else if (axis == axes.xaxis || axis == axes.x2axis)
				// heuristic based on the model a*sqrt(x) fitted to
				// some reasonable data points
				noTicks = 0.3 * Math.sqrt(canvasWidth);
			else
				noTicks = 0.3 * Math.sqrt(canvasHeight);

			var delta = (axis.max - axis.min) / noTicks, size, generator, unit, formatter, i, magn, norm;

			if (axisOptions.mode == "time") {
				// pretty handling of time

				// map of app. size of time units in milliseconds
				var timeUnitSize = {
					"second" : 1000,
					"minute" : 60 * 1000,
					"hour" : 60 * 60 * 1000,
					"day" : 24 * 60 * 60 * 1000,
					"month" : 30 * 24 * 60 * 60 * 1000,
					"year" : 365.2425 * 24 * 60 * 60 * 1000
				};

				// the allowed tick sizes, after 1 year we use
				// an integer algorithm
				var spec = [ [ 1, "second" ], [ 2, "second" ], [ 5, "second" ],
						[ 10, "second" ], [ 30, "second" ], [ 1, "minute" ],
						[ 2, "minute" ], [ 5, "minute" ], [ 10, "minute" ],
						[ 30, "minute" ], [ 1, "hour" ], [ 2, "hour" ],
						[ 4, "hour" ], [ 8, "hour" ], [ 12, "hour" ],
						[ 1, "day" ], [ 2, "day" ], [ 3, "day" ],
						[ 0.25, "month" ], [ 0.5, "month" ], [ 1, "month" ],
						[ 2, "month" ], [ 3, "month" ], [ 6, "month" ],
						[ 1, "year" ] ];

				var minSize = 0;
				if (axisOptions.minTickSize != null) {
					if (typeof axisOptions.tickSize == "number")
						minSize = axisOptions.tickSize;
					else
						minSize = axisOptions.minTickSize[0]
								* timeUnitSize[axisOptions.minTickSize[1]];
				}

				for (i = 0; i < spec.length - 1; ++i)
					if (delta < (spec[i][0] * timeUnitSize[spec[i][1]] + spec[i + 1][0]
							* timeUnitSize[spec[i + 1][1]]) / 2
							&& spec[i][0] * timeUnitSize[spec[i][1]] >= minSize)
						break;
				size = spec[i][0];
				unit = spec[i][1];

				// special-case the possibility of several years
				if (unit == "year") {
					magn = Math.pow(10, Math.floor(Math.log(delta
							/ timeUnitSize.year)
							/ Math.LN10));
					norm = (delta / timeUnitSize.year) / magn;
					if (norm < 1.5)
						size = 1;
					else if (norm < 3)
						size = 2;
					else if (norm < 7.5)
						size = 5;
					else
						size = 10;

					size *= magn;
				}

				if (axisOptions.tickSize) {
					size = axisOptions.tickSize[0];
					unit = axisOptions.tickSize[1];
				}

				generator = function(axis) {
					var ticks = [], tickSize = axis.tickSize[0], unit = axis.tickSize[1], d = new Date(
							axis.min);

					var step = tickSize * timeUnitSize[unit];

					if (unit == "second")
						d
								.setUTCSeconds(floorInBase(d.getUTCSeconds(),
										tickSize));
					if (unit == "minute")
						d
								.setUTCMinutes(floorInBase(d.getUTCMinutes(),
										tickSize));
					if (unit == "hour")
						d.setUTCHours(floorInBase(d.getUTCHours(), tickSize));
					if (unit == "month")
						d.setUTCMonth(floorInBase(d.getUTCMonth(), tickSize));
					if (unit == "year")
						d.setUTCFullYear(floorInBase(d.getUTCFullYear(),
								tickSize));

					// reset smaller components
					d.setUTCMilliseconds(0);
					if (step >= timeUnitSize.minute)
						d.setUTCSeconds(0);
					if (step >= timeUnitSize.hour)
						d.setUTCMinutes(0);
					if (step >= timeUnitSize.day)
						d.setUTCHours(0);
					if (step >= timeUnitSize.day * 4)
						d.setUTCDate(1);
					if (step >= timeUnitSize.year)
						d.setUTCMonth(0);

					var carry = 0, v = Number.NaN, prev;
					do {
						prev = v;
						v = d.getTime();
						ticks.push( {
							v : v,
							label : axis.tickFormatter(v, axis)
						});
						if (unit == "month") {
							if (tickSize < 1) {
								// a bit complicated - we'll divide the month
								// up but we need to take care of fractions
								// so we don't end up in the middle of a day
								d.setUTCDate(1);
								var start = d.getTime();
								d.setUTCMonth(d.getUTCMonth() + 1);
								var end = d.getTime();
								d.setTime(v + carry * timeUnitSize.hour
										+ (end - start) * tickSize);
								carry = d.getUTCHours();
								d.setUTCHours(0);
							} else
								d.setUTCMonth(d.getUTCMonth() + tickSize);
						} else if (unit == "year") {
							d.setUTCFullYear(d.getUTCFullYear() + tickSize);
						} else
							d.setTime(v + step);
					} while (v < axis.max && v != prev);

					return ticks;
				};

				formatter = function(v, axis) {
					var d = new Date(v);

					// first check global format
					if (axisOptions.timeformat != null)
						return $.plot.formatDate(d, axisOptions.timeformat,
								axisOptions.monthNames);

					var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
					var span = axis.max - axis.min;
					var suffix = (axisOptions.twelveHourClock) ? " %p" : "";

					if (t < timeUnitSize.minute)
						fmt = "%h:%M:%S" + suffix;
					else if (t < timeUnitSize.day) {
						if (span < 2 * timeUnitSize.day)
							fmt = "%h:%M" + suffix;
						else
							fmt = "%b %d %h:%M" + suffix;
					} else if (t < timeUnitSize.month)
						fmt = "%b %d";
					else if (t < timeUnitSize.year) {
						if (span < timeUnitSize.year)
							fmt = "%b";
						else
							fmt = "%b %y";
					} else
						fmt = "%y";

					return $.plot.formatDate(d, fmt, axisOptions.monthNames);
				};
			} else {
				// pretty rounding of base-10 numbers
				var maxDec = axisOptions.tickDecimals;
				var dec = -Math.floor(Math.log(delta) / Math.LN10);
				if (maxDec != null && dec > maxDec)
					dec = maxDec;

				magn = Math.pow(10, -dec);
				norm = delta / magn; // norm is between 1.0 and 10.0

				if (norm < 1.5)
					size = 1;
				else if (norm < 3) {
					size = 2;
					// special case for 2.5, requires an extra decimal
					if (norm > 2.25 && (maxDec == null || dec + 1 <= maxDec)) {
						size = 2.5;
						++dec;
					}
				} else if (norm < 7.5)
					size = 5;
				else
					size = 10;

				size *= magn;

				if (axisOptions.minTickSize != null
						&& size < axisOptions.minTickSize)
					size = axisOptions.minTickSize;

				if (axisOptions.tickSize != null)
					size = axisOptions.tickSize;

				axis.tickDecimals = Math
						.max(0, (maxDec != null) ? maxDec : dec);

				generator = function(axis) {
					var ticks = [];

					// spew out all possible ticks
					var start = floorInBase(axis.min, axis.tickSize), i = 0, v = Number.NaN, prev;
					do {
						prev = v;
						v = start + i * axis.tickSize;
						ticks.push( {
							v : v,
							label : axis.tickFormatter(v, axis)
						});
						++i;
					} while (v < axis.max && v != prev);
					return ticks;
				};

				formatter = function(v, axis) {
					return v.toFixed(axis.tickDecimals);
				};
			}

			axis.tickSize = unit ? [ size, unit ] : size;
			axis.tickGenerator = generator;
			if ($.isFunction(axisOptions.tickFormatter))
				axis.tickFormatter = function(v, axis) {
					return "" + axisOptions.tickFormatter(v, axis);
				};
			else
				axis.tickFormatter = formatter;
		}

		function setTicks(axis, axisOptions) {
			axis.ticks = [];

			if (!axis.used)
				return;

			if (axisOptions.ticks == null)
				axis.ticks = axis.tickGenerator(axis);
			else if (typeof axisOptions.ticks == "number") {
				if (axisOptions.ticks > 0)
					axis.ticks = axis.tickGenerator(axis);
			} else if (axisOptions.ticks) {
				var ticks = axisOptions.ticks;

				if ($.isFunction(ticks))
					// generate the ticks
					ticks = ticks( {
						min : axis.min,
						max : axis.max
					});

				// clean up the user-supplied ticks, copy them over
				var i, v;
				for (i = 0; i < ticks.length; ++i) {
					var label = null;
					var t = ticks[i];
					if (typeof t == "object") {
						v = t[0];
						if (t.length > 1)
							label = t[1];
					} else
						v = t;
					if (label == null)
						label = axis.tickFormatter(v, axis);
					axis.ticks[i] = {
						v : v,
						label : label
					};
				}
			}

			if (axisOptions.autoscaleMargin != null && axis.ticks.length > 0) {
				// snap to ticks
				if (axisOptions.min == null)
					axis.min = Math.min(axis.min, axis.ticks[0].v);
				if (axisOptions.max == null && axis.ticks.length > 1)
					axis.max = Math.max(axis.max,
							axis.ticks[axis.ticks.length - 1].v);
			}
		}

		function draw() {
			ctx.clearRect(0, 0, canvasWidth, canvasHeight);

			var grid = options.grid;

			if (grid.show && !grid.aboveData)
				drawGrid();

			for ( var i = 0; i < series.length; ++i)
				drawSeries(series[i]);

			executeHooks(hooks.draw, [ ctx ]);

			if (grid.show && grid.aboveData)
				drawGrid();
		}

		function extractRange(ranges, coord) {
			var firstAxis = coord + "axis", secondaryAxis = coord + "2axis", axis, from, to, reverse;

			if (ranges[firstAxis]) {
				axis = axes[firstAxis];
				from = ranges[firstAxis].from;
				to = ranges[firstAxis].to;
			} else if (ranges[secondaryAxis]) {
				axis = axes[secondaryAxis];
				from = ranges[secondaryAxis].from;
				to = ranges[secondaryAxis].to;
			} else {
				// backwards-compat stuff - to be removed in future
				axis = axes[firstAxis];
				from = ranges[coord + "1"];
				to = ranges[coord + "2"];
			}

			// auto-reverse as an added bonus
			if (from != null && to != null && from > to)
				return {
					from : to,
					to : from,
					axis : axis
				};

			return {
				from : from,
				to : to,
				axis : axis
			};
		}

		function drawGrid() {
			var i;

			ctx.save();
			ctx.translate(plotOffset.left, plotOffset.top);

			// draw background, if any
			if (options.grid.backgroundColor) {
				ctx.fillStyle = getColorOrGradient(
						options.grid.backgroundColor, plotHeight, 0,
						"rgba(255, 255, 255, 0)");
				ctx.fillRect(0, 0, plotWidth, plotHeight);
			}

			// draw markings
			var markings = options.grid.markings;
			if (markings) {
				if ($.isFunction(markings))
					// xmin etc. are backwards-compatible, to be removed in
					// future
					markings = markings( {
						xmin : axes.xaxis.min,
						xmax : axes.xaxis.max,
						ymin : axes.yaxis.min,
						ymax : axes.yaxis.max,
						xaxis : axes.xaxis,
						yaxis : axes.yaxis,
						x2axis : axes.x2axis,
						y2axis : axes.y2axis
					});

				for (i = 0; i < markings.length; ++i) {
					var m = markings[i], xrange = extractRange(m, "x"), yrange = extractRange(
							m, "y");

					// fill in missing
					if (xrange.from == null)
						xrange.from = xrange.axis.min;
					if (xrange.to == null)
						xrange.to = xrange.axis.max;
					if (yrange.from == null)
						yrange.from = yrange.axis.min;
					if (yrange.to == null)
						yrange.to = yrange.axis.max;

					// clip
					if (xrange.to < xrange.axis.min
							|| xrange.from > xrange.axis.max
							|| yrange.to < yrange.axis.min
							|| yrange.from > yrange.axis.max)
						continue;

					xrange.from = Math.max(xrange.from, xrange.axis.min);
					xrange.to = Math.min(xrange.to, xrange.axis.max);
					yrange.from = Math.max(yrange.from, yrange.axis.min);
					yrange.to = Math.min(yrange.to, yrange.axis.max);

					if (xrange.from == xrange.to && yrange.from == yrange.to)
						continue;

					// then draw
					xrange.from = xrange.axis.p2c(xrange.from);
					xrange.to = xrange.axis.p2c(xrange.to);
					yrange.from = yrange.axis.p2c(yrange.from);
					yrange.to = yrange.axis.p2c(yrange.to);

					if (xrange.from == xrange.to || yrange.from == yrange.to) {
						// draw line
						ctx.beginPath();
						ctx.strokeStyle = m.color || options.grid.markingsColor;
						ctx.lineWidth = m.lineWidth
								|| options.grid.markingsLineWidth;
						// ctx.moveTo(Math.floor(xrange.from), yrange.from);
						// ctx.lineTo(Math.floor(xrange.to), yrange.to);
						ctx.moveTo(xrange.from, yrange.from);
						ctx.lineTo(xrange.to, yrange.to);
						ctx.stroke();
					} else {
						// fill area
						ctx.fillStyle = m.color || options.grid.markingsColor;
						ctx.fillRect(xrange.from, yrange.to, xrange.to
								- xrange.from, yrange.from - yrange.to);
					}
				}
			}

			// draw the inner grid
			ctx.lineWidth = 1;
			ctx.strokeStyle = options.grid.tickColor;
			ctx.beginPath();
			var v, axis = axes.xaxis;
			for (i = 0; i < axis.ticks.length; ++i) {
				v = axis.ticks[i].v;
				if (v <= axis.min || v >= axes.xaxis.max)
					continue; // skip those lying on the axes

				ctx.moveTo(Math.floor(axis.p2c(v)) + ctx.lineWidth / 2, 0);
				ctx.lineTo(Math.floor(axis.p2c(v)) + ctx.lineWidth / 2,
						plotHeight);
			}

			axis = axes.yaxis;
			for (i = 0; i < axis.ticks.length; ++i) {
				v = axis.ticks[i].v;
				if (v <= axis.min || v >= axis.max)
					continue;

				ctx.moveTo(0, Math.floor(axis.p2c(v)) + ctx.lineWidth / 2);
				ctx.lineTo(plotWidth, Math.floor(axis.p2c(v)) + ctx.lineWidth
						/ 2);
			}

			axis = axes.x2axis;
			for (i = 0; i < axis.ticks.length; ++i) {
				v = axis.ticks[i].v;
				if (v <= axis.min || v >= axis.max)
					continue;

				ctx.moveTo(Math.floor(axis.p2c(v)) + ctx.lineWidth / 2, -5);
				ctx.lineTo(Math.floor(axis.p2c(v)) + ctx.lineWidth / 2, 5);
			}

			axis = axes.y2axis;
			for (i = 0; i < axis.ticks.length; ++i) {
				v = axis.ticks[i].v;
				if (v <= axis.min || v >= axis.max)
					continue;

				ctx.moveTo(plotWidth - 5, Math.floor(axis.p2c(v))
						+ ctx.lineWidth / 2);
				ctx.lineTo(plotWidth + 5, Math.floor(axis.p2c(v))
						+ ctx.lineWidth / 2);
			}

			ctx.stroke();

			if (options.grid.borderWidth) {
				// draw border
				var bw = options.grid.borderWidth;
				ctx.lineWidth = bw;
				ctx.strokeStyle = options.grid.borderColor;
				ctx.strokeRect(-bw / 2, -bw / 2, plotWidth + bw, plotHeight
						+ bw);
			}

			ctx.restore();
		}

		function insertLabels() {
			placeholder.find(".tickLabels").remove();

			var html = [ '<div class="tickLabels" style="font-size:smaller;color:'
					+ options.grid.color + '">' ];

			function addLabels(axis, labelGenerator) {
				for ( var i = 0; i < axis.ticks.length; ++i) {
					var tick = axis.ticks[i];
					if (!tick.label || tick.v < axis.min || tick.v > axis.max)
						continue;
					html.push(labelGenerator(tick, axis));
				}
			}

			var margin = options.grid.labelMargin + options.grid.borderWidth;

			addLabels(axes.xaxis, function(tick, axis) {
				return '<div style="position:absolute;top:'
						+ (plotOffset.top + plotHeight + margin)
						+ 'px;left:'
						+ Math.round(plotOffset.left + axis.p2c(tick.v)
								- axis.labelWidth / 2) + 'px;width:'
						+ axis.labelWidth
						+ 'px;text-align:center" class="tickLabel">'
						+ tick.label + "</div>";
			});

			addLabels(axes.yaxis, function(tick, axis) {
				return '<div style="position:absolute;top:'
						+ Math.round(plotOffset.top + axis.p2c(tick.v)
								- axis.labelHeight / 2) + 'px;right:'
						+ (plotOffset.right + plotWidth + margin) + 'px;width:'
						+ axis.labelWidth
						+ 'px;text-align:right" class="tickLabel">'
						+ tick.label + "</div>";
			});

			addLabels(axes.x2axis, function(tick, axis) {
				return '<div style="position:absolute;bottom:'
						+ (plotOffset.bottom + plotHeight + margin)
						+ 'px;left:'
						+ Math.round(plotOffset.left + axis.p2c(tick.v)
								- axis.labelWidth / 2) + 'px;width:'
						+ axis.labelWidth
						+ 'px;text-align:center" class="tickLabel">'
						+ tick.label + "</div>";
			});

			addLabels(axes.y2axis, function(tick, axis) {
				return '<div style="position:absolute;top:'
						+ Math.round(plotOffset.top + axis.p2c(tick.v)
								- axis.labelHeight / 2) + 'px;left:'
						+ (plotOffset.left + plotWidth + margin) + 'px;width:'
						+ axis.labelWidth
						+ 'px;text-align:left" class="tickLabel">' + tick.label
						+ "</div>";
			});

			html.push('</div>');

			placeholder.append(html.join(""));
		}

		function drawSeries(series) {
			if (series.lines.show)
				drawSeriesLines(series);
			if (series.bars.show)
				drawSeriesBars(series);
			if (series.points.show)
				drawSeriesPoints(series);
		}

		function drawSeriesLines(series) {
			function plotLine(datapoints, xoffset, yoffset, axisx, axisy) {
				var points = datapoints.points, ps = datapoints.pointsize, prevx = null, prevy = null;

				ctx.beginPath();
				for ( var i = ps; i < points.length; i += ps) {
					var x1 = points[i - ps], y1 = points[i - ps + 1], x2 = points[i], y2 = points[i + 1];

					if (x1 == null || x2 == null)
						continue;

					// clip with ymin
					if (y1 <= y2 && y1 < axisy.min) {
						if (y2 < axisy.min)
							continue; // line segment is outside
						// compute new intersection point
						x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
						y1 = axisy.min;
					} else if (y2 <= y1 && y2 < axisy.min) {
						if (y1 < axisy.min)
							continue;
						x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
						y2 = axisy.min;
					}

					// clip with ymax
					if (y1 >= y2 && y1 > axisy.max) {
						if (y2 > axisy.max)
							continue;
						x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
						y1 = axisy.max;
					} else if (y2 >= y1 && y2 > axisy.max) {
						if (y1 > axisy.max)
							continue;
						x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
						y2 = axisy.max;
					}

					// clip with xmin
					if (x1 <= x2 && x1 < axisx.min) {
						if (x2 < axisx.min)
							continue;
						y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
						x1 = axisx.min;
					} else if (x2 <= x1 && x2 < axisx.min) {
						if (x1 < axisx.min)
							continue;
						y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
						x2 = axisx.min;
					}

					// clip with xmax
					if (x1 >= x2 && x1 > axisx.max) {
						if (x2 > axisx.max)
							continue;
						y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
						x1 = axisx.max;
					} else if (x2 >= x1 && x2 > axisx.max) {
						if (x1 > axisx.max)
							continue;
						y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
						x2 = axisx.max;
					}

					if (x1 != prevx || y1 != prevy)
						ctx.moveTo(axisx.p2c(x1) + xoffset, axisy.p2c(y1)
								+ yoffset);

					prevx = x2;
					prevy = y2;
					ctx
							.lineTo(axisx.p2c(x2) + xoffset, axisy.p2c(y2)
									+ yoffset);
				}
				ctx.stroke();
			}

			function plotLineArea(datapoints, axisx, axisy) {
				var points = datapoints.points, ps = datapoints.pointsize, bottom = Math
						.min(Math.max(0, axisy.min), axisy.max), top, lastX = 0, areaOpen = false;

				for ( var i = ps; i < points.length; i += ps) {
					var x1 = points[i - ps], y1 = points[i - ps + 1], x2 = points[i], y2 = points[i + 1];

					if (areaOpen && x1 != null && x2 == null) {
						// close area
						ctx.lineTo(axisx.p2c(lastX), axisy.p2c(bottom));
						ctx.fill();
						areaOpen = false;
						continue;
					}

					if (x1 == null || x2 == null)
						continue;

					// clip x values

					// clip with xmin
					if (x1 <= x2 && x1 < axisx.min) {
						if (x2 < axisx.min)
							continue;
						y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
						x1 = axisx.min;
					} else if (x2 <= x1 && x2 < axisx.min) {
						if (x1 < axisx.min)
							continue;
						y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
						x2 = axisx.min;
					}

					// clip with xmax
					if (x1 >= x2 && x1 > axisx.max) {
						if (x2 > axisx.max)
							continue;
						y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
						x1 = axisx.max;
					} else if (x2 >= x1 && x2 > axisx.max) {
						if (x1 > axisx.max)
							continue;
						y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
						x2 = axisx.max;
					}

					if (!areaOpen) {
						// open area
						ctx.beginPath();
						ctx.moveTo(axisx.p2c(x1), axisy.p2c(bottom));
						areaOpen = true;
					}

					// now first check the case where both is outside
					if (y1 >= axisy.max && y2 >= axisy.max) {
						ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.max));
						ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.max));
						lastX = x2;
						continue;
					} else if (y1 <= axisy.min && y2 <= axisy.min) {
						ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.min));
						ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.min));
						lastX = x2;
						continue;
					}

					// else it's a bit more complicated, there might
					// be two rectangles and two triangles we need to fill
					// in; to find these keep track of the current x values
					var x1old = x1, x2old = x2;

					// and clip the y values, without shortcutting

					// clip with ymin
					if (y1 <= y2 && y1 < axisy.min && y2 >= axisy.min) {
						x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
						y1 = axisy.min;
					} else if (y2 <= y1 && y2 < axisy.min && y1 >= axisy.min) {
						x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
						y2 = axisy.min;
					}

					// clip with ymax
					if (y1 >= y2 && y1 > axisy.max && y2 <= axisy.max) {
						x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
						y1 = axisy.max;
					} else if (y2 >= y1 && y2 > axisy.max && y1 <= axisy.max) {
						x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
						y2 = axisy.max;
					}

					// if the x value was changed we got a rectangle
					// to fill
					if (x1 != x1old) {
						if (y1 <= axisy.min)
							top = axisy.min;
						else
							top = axisy.max;

						ctx.lineTo(axisx.p2c(x1old), axisy.p2c(top));
						ctx.lineTo(axisx.p2c(x1), axisy.p2c(top));
					}

					// fill the triangles
					ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
					ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));

					// fill the other rectangle if it's there
					if (x2 != x2old) {
						if (y2 <= axisy.min)
							top = axisy.min;
						else
							top = axisy.max;

						ctx.lineTo(axisx.p2c(x2), axisy.p2c(top));
						ctx.lineTo(axisx.p2c(x2old), axisy.p2c(top));
					}

					lastX = Math.max(x2, x2old);
				}

				if (areaOpen) {
					ctx.lineTo(axisx.p2c(lastX), axisy.p2c(bottom));
					ctx.fill();
				}
			}

			ctx.save();
			ctx.translate(plotOffset.left, plotOffset.top);
			ctx.lineJoin = "round";

			var lw = series.lines.lineWidth, sw = series.shadowSize;
			// FIXME: consider another form of shadow when filling is turned on
			if (lw > 0 && sw > 0) {
				// draw shadow as a thick and thin line with transparency
				ctx.lineWidth = sw;
				ctx.strokeStyle = "rgba(0,0,0,0.1)";
				// position shadow at angle from the mid of line
				var angle = Math.PI / 18;
				plotLine(series.datapoints,
						Math.sin(angle) * (lw / 2 + sw / 2), Math.cos(angle)
								* (lw / 2 + sw / 2), series.xaxis, series.yaxis);
				ctx.lineWidth = sw / 2;
				plotLine(series.datapoints,
						Math.sin(angle) * (lw / 2 + sw / 4), Math.cos(angle)
								* (lw / 2 + sw / 4), series.xaxis, series.yaxis);
			}

			ctx.lineWidth = lw;
			ctx.strokeStyle = series.color;
			var fillStyle = getFillStyle(series.lines, series.color, 0,
					plotHeight);
			if (fillStyle) {
				ctx.fillStyle = fillStyle;
				plotLineArea(series.datapoints, series.xaxis, series.yaxis);
			}

			if (lw > 0)
				plotLine(series.datapoints, 0, 0, series.xaxis, series.yaxis);
			ctx.restore();
		}

		function drawSeriesPoints(series) {
			function plotPoints(datapoints, radius, fillStyle, offset,
					circumference, axisx, axisy) {
				var points = datapoints.points, ps = datapoints.pointsize;

				for ( var i = 0; i < points.length; i += ps) {
					var x = points[i], y = points[i + 1];
					if (x == null || x < axisx.min || x > axisx.max
							|| y < axisy.min || y > axisy.max)
						continue;

					ctx.beginPath();
					ctx.arc(axisx.p2c(x), axisy.p2c(y) + offset, radius, 0,
							circumference, false);
					if (fillStyle) {
						ctx.fillStyle = fillStyle;
						ctx.fill();
					}
					ctx.stroke();
				}
			}

			ctx.save();
			ctx.translate(plotOffset.left, plotOffset.top);

			var lw = series.lines.lineWidth, sw = series.shadowSize, radius = series.points.radius;
			if (lw > 0 && sw > 0) {
				// draw shadow in two steps
				var w = sw / 2;
				ctx.lineWidth = w;
				ctx.strokeStyle = "rgba(0,0,0,0.1)";
				plotPoints(series.datapoints, radius, null, w + w / 2, Math.PI,
						series.xaxis, series.yaxis);

				ctx.strokeStyle = "rgba(0,0,0,0.2)";
				plotPoints(series.datapoints, radius, null, w / 2, Math.PI,
						series.xaxis, series.yaxis);
			}

			ctx.lineWidth = lw;
			ctx.strokeStyle = series.color;
			plotPoints(series.datapoints, radius, getFillStyle(series.points,
					series.color), 0, 2 * Math.PI, series.xaxis, series.yaxis);
			ctx.restore();
		}

		function drawBar(x, y, b, barLeft, barRight, offset, fillStyleCallback,
				axisx, axisy, c, horizontal) {
			var left, right, bottom, top, drawLeft, drawRight, drawTop, drawBottom, tmp;

			if (horizontal) {
				drawBottom = drawRight = drawTop = true;
				drawLeft = false;
				left = b;
				right = x;
				top = y + barLeft;
				bottom = y + barRight;

				// account for negative bars
				if (right < left) {
					tmp = right;
					right = left;
					left = tmp;
					drawLeft = true;
					drawRight = false;
				}
			} else {
				drawLeft = drawRight = drawTop = true;
				drawBottom = false;
				left = x + barLeft;
				right = x + barRight;
				bottom = b;
				top = y;

				// account for negative bars
				if (top < bottom) {
					tmp = top;
					top = bottom;
					bottom = tmp;
					drawBottom = true;
					drawTop = false;
				}
			}

			// clip
			if (right < axisx.min || left > axisx.max || top < axisy.min
					|| bottom > axisy.max)
				return;

			if (left < axisx.min) {
				left = axisx.min;
				drawLeft = false;
			}

			if (right > axisx.max) {
				right = axisx.max;
				drawRight = false;
			}

			if (bottom < axisy.min) {
				bottom = axisy.min;
				drawBottom = false;
			}

			if (top > axisy.max) {
				top = axisy.max;
				drawTop = false;
			}

			left = axisx.p2c(left);
			bottom = axisy.p2c(bottom);
			right = axisx.p2c(right);
			top = axisy.p2c(top);

			// fill the bar
			if (fillStyleCallback) {
				c.beginPath();
				c.moveTo(left, bottom);
				c.lineTo(left, top);
				c.lineTo(right, top);
				c.lineTo(right, bottom);
				c.fillStyle = fillStyleCallback(bottom, top);
				c.fill();
			}

			// draw outline
			if (drawLeft || drawRight || drawTop || drawBottom) {
				c.beginPath();

				// FIXME: inline moveTo is buggy with excanvas
				c.moveTo(left, bottom + offset);
				if (drawLeft)
					c.lineTo(left, top + offset);
				else
					c.moveTo(left, top + offset);
				if (drawTop)
					c.lineTo(right, top + offset);
				else
					c.moveTo(right, top + offset);
				if (drawRight)
					c.lineTo(right, bottom + offset);
				else
					c.moveTo(right, bottom + offset);
				if (drawBottom)
					c.lineTo(left, bottom + offset);
				else
					c.moveTo(left, bottom + offset);
				c.stroke();
			}
		}

		function drawSeriesBars(series) {
			function plotBars(datapoints, barLeft, barRight, offset,
					fillStyleCallback, axisx, axisy) {
				var points = datapoints.points, ps = datapoints.pointsize;

				for ( var i = 0; i < points.length; i += ps) {
					if (points[i] == null)
						continue;
					drawBar(points[i], points[i + 1], points[i + 2], barLeft,
							barRight, offset, fillStyleCallback, axisx, axisy,
							ctx, series.bars.horizontal);
				}
			}

			ctx.save();
			ctx.translate(plotOffset.left, plotOffset.top);

			// FIXME: figure out a way to add shadows (for instance along the
			// right edge)
			ctx.lineWidth = series.bars.lineWidth;
			ctx.strokeStyle = series.color;
			var barLeft = series.bars.align == "left" ? 0
					: -series.bars.barWidth / 2;
			var fillStyleCallback = series.bars.fill ? function(bottom, top) {
				return getFillStyle(series.bars, series.color, bottom, top);
			} : null;
			plotBars(series.datapoints, barLeft,
					barLeft + series.bars.barWidth, 0, fillStyleCallback,
					series.xaxis, series.yaxis);
			ctx.restore();
		}

		function getFillStyle(filloptions, seriesColor, bottom, top) {
			var fill = filloptions.fill;
			if (!fill)
				return null;

			if (filloptions.fillColor)
				return getColorOrGradient(filloptions.fillColor, bottom, top,
						seriesColor);

			var c = $.color.parse(seriesColor);
			c.a = typeof fill == "number" ? fill : 0.4;
			c.normalize();
			return c.toString();
		}

		function insertLegend() {
			placeholder.find(".legend").remove();

			if (!options.legend.show)
				return;

			var fragments = [], rowStarted = false, lf = options.legend.labelFormatter, s, label;
			for (i = 0; i < series.length; ++i) {
				s = series[i];
				label = s.label;
				if (!label)
					continue;

				if (i % options.legend.noColumns == 0) {
					if (rowStarted)
						fragments.push('</tr>');
					fragments.push('<tr>');
					rowStarted = true;
				}

				if (lf)
					label = lf(label, s);

				fragments
						.push('<td class="legendColorBox"><div style="border:1px solid '
								+ options.legend.labelBoxBorderColor
								+ ';padding:1px"><div style="width:4px;height:0;border:5px solid '
								+ s.color
								+ ';overflow:hidden"></div></div></td>'
								+ '<td class="legendLabel">' + label + '</td>');
			}
			if (rowStarted)
				fragments.push('</tr>');

			if (fragments.length == 0)
				return;

			var table = '<table style="font-size:smaller;color:'
					+ options.grid.color + '">' + fragments.join("")
					+ '</table>';
			if (options.legend.container != null)
				$(options.legend.container).html(table);
			else {
				var pos = "", p = options.legend.position, m = options.legend.margin;
				if (m[0] == null)
					m = [ m, m ];
				if (p.charAt(0) == "n")
					pos += 'top:' + (m[1] + plotOffset.top) + 'px;';
				else if (p.charAt(0) == "s")
					pos += 'bottom:' + (m[1] + plotOffset.bottom) + 'px;';
				if (p.charAt(1) == "e")
					pos += 'right:' + (m[0] + plotOffset.right) + 'px;';
				else if (p.charAt(1) == "w")
					pos += 'left:' + (m[0] + plotOffset.left) + 'px;';
				var legend = $(
						'<div class="legend">'
								+ table
										.replace('style="',
												'style="position:absolute;'
														+ pos + ';') + '</div>')
						.appendTo(placeholder);
				if (options.legend.backgroundOpacity != 0.0) {
					// put in the transparent background
					// separately to avoid blended labels and
					// label boxes
					var c = options.legend.backgroundColor;
					if (c == null) {
						c = options.grid.backgroundColor;
						if (c && typeof c == "string")
							c = $.color.parse(c);
						else
							c = $.color.extract(legend, 'background-color');
						c.a = 1;
						c = c.toString();
					}
					var div = legend.children();
					$(
							'<div style="position:absolute;width:'
									+ div.width() + 'px;height:' + div.height()
									+ 'px;' + pos + 'background-color:' + c
									+ ';"> </div>').prependTo(legend).css(
							'opacity', options.legend.backgroundOpacity);
				}
			}
		}

		// interactive features

		var highlights = [], redrawTimeout = null;

		// returns the data item the mouse is over, or null if none is found
		function findNearbyItem(mouseX, mouseY, seriesFilter) {
			var maxDistance = options.grid.mouseActiveRadius, smallestDistance = maxDistance
					* maxDistance + 1, item = null, foundPoint = false, i, j;

			for (i = 0; i < series.length; ++i) {
				if (!seriesFilter(series[i]))
					continue;

				var s = series[i], axisx = s.xaxis, axisy = s.yaxis, points = s.datapoints.points, ps = s.datapoints.pointsize, mx = axisx
						.c2p(mouseX), // precompute some stuff to make the
				// loop faster
				my = axisy.c2p(mouseY), maxx = maxDistance / axisx.scale, maxy = maxDistance
						/ axisy.scale;

				if (s.lines.show || s.points.show) {
					for (j = 0; j < points.length; j += ps) {
						var x = points[j], y = points[j + 1];
						if (x == null)
							continue;

						// For points and lines, the cursor must be within a
						// certain distance to the data point
						if (x - mx > maxx || x - mx < -maxx || y - my > maxy
								|| y - my < -maxy)
							continue;

						// We have to calculate distances in pixels, not in
						// data units, because the scales of the axes may be
						// different
						var dx = Math.abs(axisx.p2c(x) - mouseX), dy = Math
								.abs(axisy.p2c(y) - mouseY), dist = dx * dx
								+ dy * dy; // we save the sqrt

						// use <= to ensure last point takes precedence
						// (last generally means on top of)
						if (dist <= smallestDistance) {
							smallestDistance = dist;
							item = [ i, j / ps ];
						}
					}
				}

				if (s.bars.show && !item) { // no other point can be nearby
					var barLeft = s.bars.align == "left" ? 0
							: -s.bars.barWidth / 2, barRight = barLeft
							+ s.bars.barWidth;

					for (j = 0; j < points.length; j += ps) {
						var x = points[j], y = points[j + 1], b = points[j + 2];
						if (x == null)
							continue;

						// for a bar graph, the cursor must be inside the bar
						if (series[i].bars.horizontal ? (mx <= Math.max(b, x)
								&& mx >= Math.min(b, x) && my >= y + barLeft && my <= y
								+ barRight)
								: (mx >= x + barLeft && mx <= x + barRight
										&& my >= Math.min(b, y) && my <= Math
										.max(b, y)))
							item = [ i, j / ps ];
					}
				}
			}

			if (item) {
				i = item[0];
				j = item[1];
				ps = series[i].datapoints.pointsize;

				return {
					datapoint : series[i].datapoints.points.slice(j * ps,
							(j + 1) * ps),
					dataIndex : j,
					series : series[i],
					seriesIndex : i
				};
			}

			return null;
		}

		function onMouseMove(e) {
			if (options.grid.hoverable)
				triggerClickHoverEvent("plothover", e, function(s) {
					return s["hoverable"] != false;
				});
		}

		function onClick(e) {
			triggerClickHoverEvent("plotclick", e, function(s) {
				return s["clickable"] != false;
			});
		}

		// trigger click or hover event (they send the same parameters
		// so we share their code)
		function triggerClickHoverEvent(eventname, event, seriesFilter) {
			var offset = eventHolder.offset(), pos = {
				pageX : event.pageX,
				pageY : event.pageY
			}, canvasX = event.pageX - offset.left - plotOffset.left, canvasY = event.pageY
					- offset.top - plotOffset.top;

			if (axes.xaxis.used)
				pos.x = axes.xaxis.c2p(canvasX);
			if (axes.yaxis.used)
				pos.y = axes.yaxis.c2p(canvasY);
			if (axes.x2axis.used)
				pos.x2 = axes.x2axis.c2p(canvasX);
			if (axes.y2axis.used)
				pos.y2 = axes.y2axis.c2p(canvasY);

			var item = findNearbyItem(canvasX, canvasY, seriesFilter);

			if (item) {
				// fill in mouse pos for any listeners out there
				item.pageX = parseInt(item.series.xaxis.p2c(item.datapoint[0])
						+ offset.left + plotOffset.left);
				item.pageY = parseInt(item.series.yaxis.p2c(item.datapoint[1])
						+ offset.top + plotOffset.top);
			}

			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 && h.point == item.datapoint))
						unhighlight(h.series, h.point);
				}

				if (item)
					highlight(item.series, item.datapoint, eventname);
			}

			placeholder.trigger(eventname, [ pos, item ]);
		}

		function triggerRedrawOverlay() {
			if (!redrawTimeout)
				redrawTimeout = setTimeout(drawOverlay, 30);
		}

		function drawOverlay() {
			redrawTimeout = null;

			// draw highlights
			octx.save();
			octx.clearRect(0, 0, canvasWidth, canvasHeight);
			octx.translate(plotOffset.left, plotOffset.top);

			var i, hi;
			for (i = 0; i < highlights.length; ++i) {
				hi = highlights[i];

				if (hi.series.bars.show)
					drawBarHighlight(hi.series, hi.point);
				else
					drawPointHighlight(hi.series, hi.point);
			}
			octx.restore();

			executeHooks(hooks.drawOverlay, [ octx ]);
		}

		function highlight(s, point, auto) {
			if (typeof s == "number")
				s = series[s];

			if (typeof point == "number")
				point = s.data[point];

			var i = indexOfHighlight(s, point);
			if (i == -1) {
				highlights.push( {
					series : s,
					point : point,
					auto : auto
				});

				triggerRedrawOverlay();
			} else if (!auto)
				highlights[i].auto = false;
		}

		function unhighlight(s, point) {
			if (s == null && point == null) {
				highlights = [];
				triggerRedrawOverlay();
			}

			if (typeof s == "number")
				s = series[s];

			if (typeof point == "number")
				point = s.data[point];

			var i = indexOfHighlight(s, point);
			if (i != -1) {
				highlights.splice(i, 1);

				triggerRedrawOverlay();
			}
		}

		function indexOfHighlight(s, p) {
			for ( var i = 0; i < highlights.length; ++i) {
				var h = highlights[i];
				if (h.series == s && h.point[0] == p[0] && h.point[1] == p[1])
					return i;
			}
			return -1;
		}

		function drawPointHighlight(series, point) {
			var x = point[0], y = point[1], axisx = series.xaxis, axisy = series.yaxis;

			if (x < axisx.min || x > axisx.max || y < axisy.min
					|| y > axisy.max)
				return;

			var pointRadius = series.points.radius + series.points.lineWidth
					/ 2;
			octx.lineWidth = pointRadius;
			octx.strokeStyle = $.color.parse(series.color).scale('a', 0.5)
					.toString();
			var radius = 1.5 * pointRadius;
			octx.beginPath();
			octx.arc(axisx.p2c(x), axisy.p2c(y), radius, 0, 2 * Math.PI, false);
			octx.stroke();
		}

		function drawBarHighlight(series, point) {
			octx.lineWidth = series.bars.lineWidth;
			octx.strokeStyle = $.color.parse(series.color).scale('a', 0.5)
					.toString();
			var fillStyle = $.color.parse(series.color).scale('a', 0.5)
					.toString();
			var barLeft = series.bars.align == "left" ? 0
					: -series.bars.barWidth / 2;
			drawBar(point[0], point[1], point[2] || 0, barLeft, barLeft
					+ series.bars.barWidth, 0, function() {
				return fillStyle;
			}, series.xaxis, series.yaxis, octx, series.bars.horizontal);
		}

		function getColorOrGradient(spec, bottom, top, defaultColor) {
			if (typeof spec == "string")
				return spec;
			else {
				// assume this is a gradient spec; IE currently only
				// supports a simple vertical gradient properly, so that's
				// what we support too
				var gradient = ctx.createLinearGradient(0, top, 0, bottom);

				for ( var i = 0, l = spec.colors.length; i < l; ++i) {
					var c = spec.colors[i];
					if (typeof c != "string") {
						c = $.color.parse(defaultColor).scale('rgb',
								c.brightness);
						c.a *= c.opacity;
						c = c.toString();
					}
					gradient.addColorStop(i / (l - 1), c);
				}

				return gradient;
			}
		}
	}

	$.plot = function(placeholder, data, options) {
		var plot = new Plot($(placeholder), data, options, $.plot.plugins);
		/*
		 * var t0 = new Date(); var t1 = new Date(); var tstr = "time used
		 * (msecs): " + (t1.getTime() - t0.getTime()) if (window.console)
		 * console.log(tstr); else alert(tstr);
		 */
		return plot;
	};

	$.plot.plugins = [];

	// returns a string with the date d formatted according to fmt
	$.plot.formatDate = function(d, fmt, monthNames) {
		var leftPad = function(n) {
			n = "" + n;
			return n.length == 1 ? "0" + n : n;
		};

		var r = [];
		var escape = false;
		var hours = d.getUTCHours();
		var isAM = hours < 12;
		if (monthNames == null)
			monthNames = [ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
					"Aug", "Sep", "Oct", "Nov", "Dec" ];

		if (fmt.search(/%p|%P/) != -1) {
			if (hours > 12) {
				hours = hours - 12;
			} else if (hours == 0) {
				hours = 12;
			}
		}
		for ( var i = 0; i < fmt.length; ++i) {
			var c = fmt.charAt(i);

			if (escape) {
				switch (c) {
				case 'h':
					c = "" + hours;
					break;
				case 'H':
					c = leftPad(hours);
					break;
				case 'M':
					c = leftPad(d.getUTCMinutes());
					break;
				case 'S':
					c = leftPad(d.getUTCSeconds());
					break;
				case 'd':
					c = "" + d.getUTCDate();
					break;
				case 'm':
					c = "" + (d.getUTCMonth() + 1);
					break;
				case 'y':
					c = "" + d.getUTCFullYear();
					break;
				case 'b':
					c = "" + monthNames[d.getUTCMonth()];
					break;
				case 'p':
					c = (isAM) ? ("" + "am") : ("" + "pm");
					break;
				case 'P':
					c = (isAM) ? ("" + "AM") : ("" + "PM");
					break;
				}
				r.push(c);
				escape = false;
			} else {
				if (c == "%")
					escape = true;
				else
					r.push(c);
			}
		}
		return r.join("");
	};

	// round to nearby lower multiple of base
	function floorInBase(n, base) {
		return base * Math.floor(n / base);
	}

})(jQuery);