/*! Javascript plotting library for jQuery, v. 0.7.
 *
 * 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 1.1.
 *
 * 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() return the same modified object
 * instead of making a new one.
 *
 * V. 1.1: Fix error handling so e.g. parsing an empty string does
 * produce a color rather than just crashing.
 */
(function(B){B.color={};B.color.make=function(F,E,C,D){var G={};G.r=F||0;G.g=E||0;G.b=C||0;G.a=D!=null?D:1;G.add=function(J,I){for(var H=0;H<J.length;++H){G[J.charAt(H)]+=I}return G.normalize()};G.scale=function(J,I){for(var H=0;H<J.length;++H){G[J.charAt(H)]*=I}return G.normalize()};G.toString=function(){if(G.a>=1){return"rgb("+[G.r,G.g,G.b].join(",")+")"}else{return"rgba("+[G.r,G.g,G.b,G.a].join(",")+")"}};G.normalize=function(){function H(J,K,I){return K<J?J:(K>I?I:K)}G.r=H(0,parseInt(G.r),255);G.g=H(0,parseInt(G.g),255);G.b=H(0,parseInt(G.b),255);G.a=H(0,G.a,1);return G};G.clone=function(){return B.color.make(G.r,G.b,G.g,G.a)};return G.normalize()};B.color.extract=function(D,C){var E;do{E=D.css(C).toLowerCase();if(E!=""&&E!="transparent"){break}D=D.parent()}while(!B.nodeName(D.get(0),"body"));if(E=="rgba(0, 0, 0, 0)"){E="transparent"}return B.color.parse(E)};B.color.parse=function(F){var E,C=B.color.make;if(E=/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(F)){return C(parseInt(E[1],10),parseInt(E[2],10),parseInt(E[3],10))}if(E=/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(F)){return C(parseInt(E[1],10),parseInt(E[2],10),parseInt(E[3],10),parseFloat(E[4]))}if(E=/rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(F)){return C(parseFloat(E[1])*2.55,parseFloat(E[2])*2.55,parseFloat(E[3])*2.55)}if(E=/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(F)){return C(parseFloat(E[1])*2.55,parseFloat(E[2])*2.55,parseFloat(E[3])*2.55,parseFloat(E[4]))}if(E=/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(F)){return C(parseInt(E[1],16),parseInt(E[2],16),parseInt(E[3],16))}if(E=/#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(F)){return C(parseInt(E[1]+E[1],16),parseInt(E[2]+E[2],16),parseInt(E[3]+E[3],16))}var D=B.trim(F).toLowerCase();if(D=="transparent"){return C(255,255,255,0)}else{E=A[D]||[0,0,0];return C(E[0],E[1],E[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]}})(jQuery);

// 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: {
					show: null, // null = auto-detect, true = always, false = never
					position: "bottom", // or "top"
					mode: null, // null or "time"
					color: null, // base color, labels, ticks
					tickColor: null, // possibly different color of ticks, e.g. "rgba(0,0,0,0.15)"
					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,
					reserveSpace: null, // whether to reserve space even if axis isn't shown
					tickLength: null, // size in pixels of ticks, or "full" for whole line
					alignTicksWithAxis: null, // axis number or null for no sync

					// 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,
					position: "left" // or "right"
				},
				xaxes: [],
				yaxes: [],
				series: {
					points: {
						show: false,
						radius: 3,
						lineWidth: 2, // in pixels
						fill: true,
						fillColor: "#ffffff",
						symbol: "circle" // or callback
					},
					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
					},
					shadowSize: 3
				},
				grid: {
					show: true,
					aboveData: false,
					color: "#545454", // primary color used for outline and labels
					backgroundColor: null, // null for transparent, else color
					borderColor: null, // set if different from the grid color
					tickColor: null, // color for the ticks, e.g. "rgba(0,0,0,0.15)"
					labelMargin: 5, // in pixels
					axisMargin: 8, // in pixels
					borderWidth: 2, // in pixels
					minBorderMargin: null, // in pixels, null means taken from points radius
					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,
			xaxes = [], yaxes = [],
			plotOffset = { left: 0, right: 0, top: 0, bottom: 0},
			canvasWidth = 0, canvasHeight = 0,
			plotWidth = 0, plotHeight = 0,
			hooks = {
				processOptions: [],
				processRawData: [],
				processDatapoints: [],
				drawSeries: [],
				draw: [],
				bindEvents: [],
				drawOverlay: [],
				shutdown: []
			},
			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 () {
			var res = {}, i;
			$.each(xaxes.concat(yaxes), function (_, axis) {
				if (axis)
					res[axis.direction + (axis.n != 1 ? axis.n : "") + "axis"] = axis;
			});
			return res;
		};
		plot.getXAxes = function () { return xaxes; };
		plot.getYAxes = function () { return yaxes; };
		plot.c2p = canvasToAxisCoords;
		plot.p2c = axisToCanvasCoords;
		plot.getOptions = function () { return options; };
		plot.highlight = highlight;
		plot.unhighlight = unhighlight;
		plot.triggerRedrawOverlay = triggerRedrawOverlay;
		plot.pointOffset = function(point) {
			return {
				left: parseInt(xaxes[axisNumber(point, "x") - 1].p2c(+point.x) + plotOffset.left),
				top: parseInt(yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top)
			};
		};
		plot.shutdown = shutdown;
		plot.resize = function () {
			getCanvasDimensions();
			resizeCanvas(canvas);
			resizeCanvas(overlay);
		};

		// public attributes
		plot.hooks = hooks;

		// initialize
		initPlugins(plot);
		parseOptions(options_);
		setupCanvases();
		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) {
			var i;

			$.extend(true, options, opts);

			if (options.xaxis.color == null)
				options.xaxis.color = options.grid.color;
			if (options.yaxis.color == null)
				options.yaxis.color = options.grid.color;

			if (options.xaxis.tickColor == null) // backwards-compatibility
				options.xaxis.tickColor = options.grid.tickColor;
			if (options.yaxis.tickColor == null) // backwards-compatibility
				options.yaxis.tickColor = options.grid.tickColor;

			if (options.grid.borderColor == null)
				options.grid.borderColor = options.grid.color;
			if (options.grid.tickColor == null)
				options.grid.tickColor = $.color.parse(options.grid.color).scale('a', 0.22).toString();

			// fill in defaults in axes, copy at least always the
			// first as the rest of the code assumes it'll be there
			for (i = 0; i < Math.max(1, options.xaxes.length); ++i)
				options.xaxes[i] = $.extend(true, {}, options.xaxis, options.xaxes[i]);
			for (i = 0; i < Math.max(1, options.yaxes.length); ++i)
				options.yaxes[i] = $.extend(true, {}, options.yaxis, options.yaxes[i]);

			// 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.x2axis) {
				options.xaxes[1] = $.extend(true, {}, options.xaxis, options.x2axis);
				options.xaxes[1].position = "top";
			}
			if (options.y2axis) {
				options.yaxes[1] = $.extend(true, {}, options.yaxis, options.y2axis);
				options.yaxes[1].position = "right";
			}
			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 != null)
				options.series.shadowSize = options.shadowSize;

			// save options on axes for future reference
			for (i = 0; i < options.xaxes.length; ++i)
				getOrCreateAxis(xaxes, i + 1).options = options.xaxes[i];
			for (i = 0; i < options.yaxes.length; ++i)
				getOrCreateAxis(yaxes, i + 1).options = options.yaxes[i];

			// add hooks from options
			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 != null) {
					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 axisNumber(obj, coord) {
			var a = obj[coord + "axis"];
			if (typeof a == "object") // if we got a real axis, extract number
				a = a.n;
			if (typeof a != "number")
				a = 1; // default to first axis
			return a;
		}

		function allAxes() {
			// return flat array without annoying null entries
			return $.grep(xaxes.concat(yaxes), function (a) { return a; });
		}

		function canvasToAxisCoords(pos) {
			// return an object with x/y corresponding to all used axes
			var res = {}, i, axis;
			for (i = 0; i < xaxes.length; ++i) {
				axis = xaxes[i];
				if (axis && axis.used)
					res["x" + axis.n] = axis.c2p(pos.left);
			}

			for (i = 0; i < yaxes.length; ++i) {
				axis = yaxes[i];
				if (axis && axis.used)
					res["y" + axis.n] = axis.c2p(pos.top);
			}

			if (res.x1 !== undefined)
				res.x = res.x1;
			if (res.y1 !== undefined)
				res.y = res.y1;

			return res;
		}

		function axisToCanvasCoords(pos) {
			// get canvas coords from the first pair of x/y found in pos
			var res = {}, i, axis, key;

			for (i = 0; i < xaxes.length; ++i) {
				axis = xaxes[i];
				if (axis && axis.used) {
					key = "x" + axis.n;
					if (pos[key] == null && axis.n == 1)
						key = "x";

					if (pos[key] != null) {
						res.left = axis.p2c(pos[key]);
						break;
					}
				}
			}

			for (i = 0; i < yaxes.length; ++i) {
				axis = yaxes[i];
				if (axis && axis.used) {
					key = "y" + axis.n;
					if (pos[key] == null && axis.n == 1)
						key = "y";

					if (pos[key] != null) {
						res.top = axis.p2c(pos[key]);
						break;
					}
				}
			}

			return res;
		}

		function getOrCreateAxis(axes, number) {
			if (!axes[number - 1])
				axes[number - 1] = {
					n: number, // save the number for future reference
					direction: axes == xaxes ? "x" : "y",
					options: $.extend(true, {}, axes == xaxes ? options.xaxis : options.yaxis)
				};

			return axes[number - 1];
		}

		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] && s[v].show) {
							show = false;
							break;
						}
					if (show)
						s.lines.show = true;
				}

				// setup axes
				s.xaxis = getOrCreateAxis(xaxes, axisNumber(s, "x"));
				s.yaxis = getOrCreateAxis(yaxes, axisNumber(s, "y"));
			}
		}

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

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

			$.each(allAxes(), function (_, axis) {
				// init axis
				axis.datamin = topSentry;
				axis.datamax = bottomSentry;
				axis.used = false;
			});

			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 || (s.lines.show && s.lines.fill)) {
						format.push({ y: true, number: true, required: false, defaultValue: 0 });
						if (s.bars.horizontal) {
							delete format[format.length - 1].y;
							format[format.length - 1].x = true;
						}
					}

					s.datapoints.format = format;
				}

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

				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;
									else if (val == Infinity)
										val = fakeInfinity;
									else if (val == -Infinity)
										val = -fakeInfinity;
								}

								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 || val == fakeInfinity || val == -fakeInfinity)
							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);
			}

			$.each(allAxes(), function (_, axis) {
				if (axis.datamin == topSentry)
					axis.datamin = null;
				if (axis.datamax == bottomSentry)
					axis.datamax = null;
			});
		}

		function makeCanvas(skipPositioning, cls) {
			var c = document.createElement('canvas');
			c.className = cls;
			c.width = canvasWidth;
			c.height = canvasHeight;

			if (!skipPositioning)
				$(c).css({ position: 'absolute', left: 0, top: 0 });

			$(c).appendTo(placeholder);

			if (!c.getContext) // excanvas hack
				c = window.G_vmlCanvasManager.initElement(c);

			// used for resetting in case we get replotted
			c.getContext("2d").save();

			return c;
		}

		function getCanvasDimensions() {
			canvasWidth = placeholder.width();
			canvasHeight = placeholder.height();

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

		function resizeCanvas(c) {
			// resizing should reset the state (excanvas seems to be
			// buggy though)
			if (c.width != canvasWidth)
				c.width = canvasWidth;

			if (c.height != canvasHeight)
				c.height = canvasHeight;

			// so try to get back to the initial state (even if it's
			// gone now, this should be safe according to the spec)
			var cctx = c.getContext("2d");
			cctx.restore();

			// and save again
			cctx.save();
		}

		function setupCanvases() {
			var reused,
				existingCanvas = placeholder.children("canvas.base"),
				existingOverlay = placeholder.children("canvas.overlay");

			if (existingCanvas.length == 0 || existingOverlay == 0) {
				// init everything

				placeholder.html(""); // make sure placeholder is clear

				placeholder.css({ padding: 0 }); // padding messes up the positioning

				if (placeholder.css("position") == 'static')
					placeholder.css("position", "relative"); // for positioning labels and overlay

				getCanvasDimensions();

				canvas = makeCanvas(true, "base");
				overlay = makeCanvas(false, "overlay"); // overlay canvas for interactive features

				reused = false;
			}
			else {
				// reuse existing elements

				canvas = existingCanvas.get(0);
				overlay = existingOverlay.get(0);

				reused = true;
			}

			ctx = canvas.getContext("2d");
			octx = overlay.getContext("2d");

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

			if (reused) {
				// run shutdown in the old plot object
				placeholder.data("plot").shutdown();

				// reset reused canvases
				plot.resize();

				// make sure overlay pixels are cleared (canvas is cleared when we redraw)
				octx.clearRect(0, 0, canvasWidth, canvasHeight);

				// then whack any remaining obvious garbage left
				eventHolder.unbind();
				placeholder.children().not([canvas, overlay]).remove();
			}

			// save in case we get replotted
			placeholder.data("plot", plot);
		}

		function bindEvents() {
			// bind events
			if (options.grid.hoverable) {
				eventHolder.mousemove(onMouseMove);
				eventHolder.mouseleave(onMouseLeave);
			}

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

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

		function shutdown() {
			if (redrawTimeout)
				clearTimeout(redrawTimeout);

			eventHolder.unbind("mousemove", onMouseMove);
			eventHolder.unbind("mouseleave", onMouseLeave);
			eventHolder.unbind("click", onClick);

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

		function setTransformationHelpers(axis) {
			// set helper functions on the axis, assumes plot area
			// has been computed already

			function identity(x) { return x; }

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

			// precompute how much the axis is scaling a point
			// in canvas space
			if (axis.direction == "x") {
				s = axis.scale = plotWidth / Math.abs(t(axis.max) - t(axis.min));
				m = Math.min(t(axis.max), t(axis.min));
			}
			else {
				s = axis.scale = plotHeight / Math.abs(t(axis.max) - t(axis.min));
				s = -s;
				m = Math.max(t(axis.max), 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); };
		}

		function measureTickLabels(axis) {
			var opts = axis.options, i, ticks = axis.ticks || [], labels = [],
				l, w = opts.labelWidth, h = opts.labelHeight, dummyDiv;

			function makeDummyDiv(labels, width) {
				return $('<div style="position:absolute;top:-10000px;' + width + 'font-size:smaller">' +
					'<div class="' + axis.direction + 'Axis ' + axis.direction + axis.n + 'Axis">'
					+ labels.join("") + '</div></div>')
					.appendTo(placeholder);
			}

			if (axis.direction == "x") {
				// to avoid measuring the widths of the labels (it's slow), 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 (w == null)
					w = Math.floor(canvasWidth / (ticks.length > 0 ? ticks.length : 1));

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

					if (labels.length > 0) {
						// stick them all in the same div and measure
						// collective height
						labels.push('<div style="clear:left"></div>');
						dummyDiv = makeDummyDiv(labels, "width:10000px;");
						h = dummyDiv.height();
						dummyDiv.remove();
					}
				}
			}
			else if (w == null || h == null) {
				// calculate y label dimensions
				for (i = 0; i < ticks.length; ++i) {
					l = ticks[i].label;
					if (l)
						labels.push('<div class="tickLabel">' + l + '</div>');
				}

				if (labels.length > 0) {
					dummyDiv = makeDummyDiv(labels, "");
					if (w == null)
						w = dummyDiv.children().width();
					if (h == null)
						h = dummyDiv.find("div.tickLabel").height();
					dummyDiv.remove();
				}
			}

			if (w == null)
				w = 0;
			if (h == null)
				h = 0;

			axis.labelWidth = w;
			axis.labelHeight = h;
		}

		function allocateAxisBoxFirstPhase(axis) {
			// find the bounding box of the axis by looking at label
			// widths/heights and ticks, make room by diminishing the
			// plotOffset

			var lw = axis.labelWidth,
				lh = axis.labelHeight,
				pos = axis.options.position,
				tickLength = axis.options.tickLength,
				axismargin = options.grid.axisMargin,
				padding = options.grid.labelMargin,
				all = axis.direction == "x" ? xaxes : yaxes,
				index;

			// determine axis margin
			var samePosition = $.grep(all, function (a) {
				return a && a.options.position == pos && a.reserveSpace;
			});
			if ($.inArray(axis, samePosition) == samePosition.length - 1)
				axismargin = 0; // outermost

			// determine tick length - if we're innermost, we can use "full"
			if (tickLength == null)
				tickLength = "full";

			var sameDirection = $.grep(all, function (a) {
				return a && a.reserveSpace;
			});

			var innermost = $.inArray(axis, sameDirection) == 0;
			if (!innermost && tickLength == "full")
				tickLength = 5;

			if (!isNaN(+tickLength))
				padding += +tickLength;

			// compute box
			if (axis.direction == "x") {
				lh += padding;

				if (pos == "bottom") {
					plotOffset.bottom += lh + axismargin;
					axis.box = { top: canvasHeight - plotOffset.bottom, height: lh };
				}
				else {
					axis.box = { top: plotOffset.top + axismargin, height: lh };
					plotOffset.top += lh + axismargin;
				}
			}
			else {
				lw += padding;

				if (pos == "left") {
					axis.box = { left: plotOffset.left + axismargin, width: lw };
					plotOffset.left += lw + axismargin;
				}
				else {
					plotOffset.right += lw + axismargin;
					axis.box = { left: canvasWidth - plotOffset.right, width: lw };
				}
			}

			// save for future reference
			axis.position = pos;
			axis.tickLength = tickLength;
			axis.box.padding = padding;
			axis.innermost = innermost;
		}

		function allocateAxisBoxSecondPhase(axis) {
			// set remaining bounding box coordinates
			if (axis.direction == "x") {
				axis.box.left = plotOffset.left;
				axis.box.width = plotWidth;
			}
			else {
				axis.box.top = plotOffset.top;
				axis.box.height = plotHeight;
			}
		}

		function setupGrid() {
			var i, axes = allAxes();

			// first calculate the plot and axis box dimensions

			$.each(axes, function (_, axis) {
				axis.show = axis.options.show;
				if (axis.show == null)
					axis.show = axis.used; // by default an axis is visible if it's got data

				axis.reserveSpace = axis.show || axis.options.reserveSpace;

				setRange(axis);
			});

			allocatedAxes = $.grep(axes, function (axis) { return axis.reserveSpace; });

			plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = 0;
			if (options.grid.show) {
				$.each(allocatedAxes, function (_, axis) {
					// make the ticks
					setupTickGeneration(axis);
					setTicks(axis);
					snapRangeToTicks(axis, axis.ticks);

					// find labelWidth/Height for axis
					measureTickLabels(axis);
				});

				// with all dimensions in house, we can compute the
				// axis boxes, start from the outside (reverse order)
				for (i = allocatedAxes.length - 1; i >= 0; --i)
					allocateAxisBoxFirstPhase(allocatedAxes[i]);

				// make sure we've got enough space for things that
				// might stick out
				var minMargin = options.grid.minBorderMargin;
				if (minMargin == null) {
					minMargin = 0;
					for (i = 0; i < series.length; ++i)
						minMargin = Math.max(minMargin, series[i].points.radius + series[i].points.lineWidth/2);
				}

				for (var a in plotOffset) {
					plotOffset[a] += options.grid.borderWidth;
					plotOffset[a] = Math.max(minMargin, plotOffset[a]);
				}
			}

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

			// now we got the proper plotWidth/Height, we can compute the scaling
			$.each(axes, function (_, axis) {
				setTransformationHelpers(axis);
			});

			if (options.grid.show) {
				$.each(allocatedAxes, function (_, axis) {
					allocateAxisBoxSecondPhase(axis);
				});

				insertAxisLabels();
			}

			insertLegend();
		}

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

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

				if (opts.min == null)
					min -= widen;
				// always widen max if we couldn't widen min to ensure we
				// don't fall into min == max which doesn't work
				if (opts.max == null || opts.min != null)
					max += widen;
			}
			else {
				// consider autoscaling
				var margin = opts.autoscaleMargin;
				if (margin != null) {
					if (opts.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 (opts.max == null) {
						max += delta * margin;
						if (max > 0 && axis.datamax != null && axis.datamax <= 0)
							max = 0;
					}
				}
			}
			axis.min = min;
			axis.max = max;
		}

		function setupTickGeneration(axis) {
			var opts = axis.options;

			// estimate number of ticks
			var noTicks;
			if (typeof opts.ticks == "number" && opts.ticks > 0)
				noTicks = opts.ticks;
			else
				// heuristic based on the model a*sqrt(x) fitted to
				// some data points that seemed reasonable
				noTicks = 0.3 * Math.sqrt(axis.direction == "x" ? canvasWidth : canvasHeight);

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

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

				for (var 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;
				}

				axis.tickSize = opts.tickSize || [size, unit];

				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);
						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 (opts.timeformat != null)
						return $.plot.formatDate(d, opts.timeformat, opts.monthNames);

					var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
					var span = axis.max - axis.min;
					var suffix = (opts.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, opts.monthNames);
				};
			}
			else {
				// pretty rounding of base-10 numbers
				var maxDec = opts.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 (opts.minTickSize != null && size < opts.minTickSize)
					size = opts.minTickSize;

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

				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);
						++i;
					} while (v < axis.max && v != prev);
					return ticks;
				};

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

			if (opts.alignTicksWithAxis != null) {
				var otherAxis = (axis.direction == "x" ? xaxes : yaxes)[opts.alignTicksWithAxis - 1];
				if (otherAxis && otherAxis.used && otherAxis != axis) {
					// consider snapping min/max to outermost nice ticks
					var niceTicks = generator(axis);
					if (niceTicks.length > 0) {
						if (opts.min == null)
							axis.min = Math.min(axis.min, niceTicks[0]);
						if (opts.max == null && niceTicks.length > 1)
							axis.max = Math.max(axis.max, niceTicks[niceTicks.length - 1]);
					}

					generator = function (axis) {
						// copy ticks, scaled to this axis
						var ticks = [], v, i;
						for (i = 0; i < otherAxis.ticks.length; ++i) {
							v = (otherAxis.ticks[i].v - otherAxis.min) / (otherAxis.max - otherAxis.min);
							v = axis.min + v * (axis.max - axis.min);
							ticks.push(v);
						}
						return ticks;
					};

					// we might need an extra decimal since forced
					// ticks don't necessarily fit naturally
					if (axis.mode != "time" && opts.tickDecimals == null) {
						var extraDec = Math.max(0, -Math.floor(Math.log(delta) / Math.LN10) + 1),
							ts = generator(axis);

						// only proceed if the tick interval rounded
						// with an extra decimal doesn't give us a
						// zero at end
						if (!(ts.length > 1 && /\..*0$/.test((ts[1] - ts[0]).toFixed(extraDec))))
							axis.tickDecimals = extraDec;
					}
				}
			}

			axis.tickGenerator = generator;
			if ($.isFunction(opts.tickFormatter))
				axis.tickFormatter = function (v, axis) { return "" + opts.tickFormatter(v, axis); };
			else
				axis.tickFormatter = formatter;
		}

		function setTicks(axis) {
			var oticks = axis.options.ticks, ticks = [];
			if (oticks == null || (typeof oticks == "number" && oticks > 0))
				ticks = axis.tickGenerator(axis);
			else if (oticks) {
				if ($.isFunction(oticks))
					// generate the ticks
					ticks = oticks({ min: axis.min, max: axis.max });
				else
					ticks = oticks;
			}

			// clean up/labelify the supplied ticks, copy them over
			var i, v;
			axis.ticks = [];
			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);
				if (!isNaN(v))
					axis.ticks.push({ v: v, label: label });
			}
		}

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

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

			var grid = options.grid;

			// draw background, if any
			if (grid.show && grid.backgroundColor)
				drawBackground();

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

			for (var i = 0; i < series.length; ++i) {
				executeHooks(hooks.drawSeries, [ctx, series[i]]);
				drawSeries(series[i]);
			}

			executeHooks(hooks.draw, [ctx]);

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

		function extractRange(ranges, coord) {
			var axis, from, to, key, axes = allAxes();

			for (i = 0; i < axes.length; ++i) {
				axis = axes[i];
				if (axis.direction == coord) {
					key = coord + axis.n + "axis";
					if (!ranges[key] && axis.n == 1)
						key = coord + "axis"; // support x1axis as xaxis
					if (ranges[key]) {
						from = ranges[key].from;
						to = ranges[key].to;
						break;
					}
				}
			}

			// backwards-compat stuff - to be removed in future
			if (!ranges[key]) {
				axis = coord == "x" ? xaxes[0] : yaxes[0];
				from = ranges[coord + "1"];
				to = ranges[coord + "2"];
			}

			// auto-reverse as an added bonus
			if (from != null && to != null && from > to) {
				var tmp = from;
				from = to;
				to = tmp;
			}

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

		function drawBackground() {
			ctx.save();
			ctx.translate(plotOffset.left, plotOffset.top);

			ctx.fillStyle = getColorOrGradient(options.grid.backgroundColor, plotHeight, 0, "rgba(255, 255, 255, 0)");
			ctx.fillRect(0, 0, plotWidth, plotHeight);
			ctx.restore();
		}

		function drawGrid() {
			var i;

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

			// draw markings
			var markings = options.grid.markings;
			if (markings) {
				if ($.isFunction(markings)) {
					var axes = plot.getAxes();
					// xmin etc. is backwards compatibility, to be
					// removed in the future
					axes.xmin = axes.xaxis.min;
					axes.xmax = axes.xaxis.max;
					axes.ymin = axes.yaxis.min;
					axes.ymax = axes.yaxis.max;

					markings = markings(axes);
				}

				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(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 ticks
			var axes = allAxes(), bw = options.grid.borderWidth;

			for (var j = 0; j < axes.length; ++j) {
				var axis = axes[j], box = axis.box,
					t = axis.tickLength, x, y, xoff, yoff;
				if (!axis.show || axis.ticks.length == 0)
					continue

				ctx.strokeStyle = axis.options.tickColor || $.color.parse(axis.options.color).scale('a', 0.22).toString();
				ctx.lineWidth = 1;

				// find the edges
				if (axis.direction == "x") {
					x = 0;
					if (t == "full")
						y = (axis.position == "top" ? 0 : plotHeight);
					else
						y = box.top - plotOffset.top + (axis.position == "top" ? box.height : 0);
				}
				else {
					y = 0;
					if (t == "full")
						x = (axis.position == "left" ? 0 : plotWidth);
					else
						x = box.left - plotOffset.left + (axis.position == "left" ? box.width : 0);
				}

				// draw tick bar
				if (!axis.innermost) {
					ctx.beginPath();
					xoff = yoff = 0;
					if (axis.direction == "x")
						xoff = plotWidth;
					else
						yoff = plotHeight;

					if (ctx.lineWidth == 1) {
						x = Math.floor(x) + 0.5;
						y = Math.floor(y) + 0.5;
					}

					ctx.moveTo(x, y);
					ctx.lineTo(x + xoff, y + yoff);
					ctx.stroke();
				}

				// draw ticks
				ctx.beginPath();
				for (i = 0; i < axis.ticks.length; ++i) {
					var v = axis.ticks[i].v;

					xoff = yoff = 0;

					if (v < axis.min || v > axis.max
						// skip those lying on the axes if we got a border
						|| (t == "full" && bw > 0
							&& (v == axis.min || v == axis.max)))
						continue;

					if (axis.direction == "x") {
						x = axis.p2c(v);
						yoff = t == "full" ? -plotHeight : t;

						if (axis.position == "top")
							yoff = -yoff;
					}
					else {
						y = axis.p2c(v);
						xoff = t == "full" ? -plotWidth : t;

						if (axis.position == "left")
							xoff = -xoff;
					}

					if (ctx.lineWidth == 1) {
						if (axis.direction == "x")
							x = Math.floor(x) + 0.5;
						else
							y = Math.floor(y) + 0.5;
					}

					ctx.moveTo(x, y);
					ctx.lineTo(x + xoff, y + yoff);
				}

				ctx.stroke();
			}


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

			ctx.restore();
		}

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

			var html = ['<div class="tickLabels" style="font-size:smaller">'];

			var axes = allAxes();
			for (var j = 0; j < axes.length; ++j) {
				var axis = axes[j], box = axis.box;
				if (!axis.show)
					continue;
				//debug: html.push('<div style="position:absolute;opacity:0.10;background-color:red;left:' + box.left + 'px;top:' + box.top + 'px;width:' + box.width +  'px;height:' + box.height + 'px"></div>')
				html.push('<div class="' + axis.direction + 'Axis ' + axis.direction + axis.n + 'Axis" style="color:' + axis.options.color + '">');
				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;

					var pos = {}, align;

					if (axis.direction == "x") {
						align = "center";
						pos.left = Math.round(plotOffset.left + axis.p2c(tick.v) - axis.labelWidth/2);
						if (axis.position == "bottom")
							pos.top = box.top + box.padding;
						else
							pos.bottom = canvasHeight - (box.top + box.height - box.padding);
					}
					else {
						pos.top = Math.round(plotOffset.top + axis.p2c(tick.v) - axis.labelHeight/2);
						if (axis.position == "left") {
							pos.right = canvasWidth - (box.left + box.width - box.padding)
							align = "right";
						}
						else {
							pos.left = box.left + box.padding;
							align = "left";
						}
					}

					pos.width = axis.labelWidth;

					var style = ["position:absolute", "text-align:" + align ];
					for (var a in pos)
						style.push(a + ":" + pos[a] + "px")

					html.push('<div class="tickLabel" style="' + style.join(';') + '">' + tick.label + '</div>');
				}
				html.push('</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),
					i = 0, top, areaOpen = false,
					ypos = 1, segmentStart = 0, segmentEnd = 0;

				// we process each segment in two turns, first forward
				// direction to sketch out top, then once we hit the
				// end we go backwards to sketch the bottom
				while (true) {
					if (ps > 0 && i > points.length + ps)
						break;

					i += ps; // ps is negative if going backwards

					var x1 = points[i - ps],
						y1 = points[i - ps + ypos],
						x2 = points[i], y2 = points[i + ypos];

					if (areaOpen) {
						if (ps > 0 && x1 != null && x2 == null) {
							// at turning point
							segmentEnd = i;
							ps = -ps;
							ypos = 2;
							continue;
						}

						if (ps < 0 && i == segmentStart + ps) {
							// done with the reverse sweep
							ctx.fill();
							areaOpen = false;
							ps = -ps;
							ypos = 1;
							i = segmentStart = segmentEnd + ps;
							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));
						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));
						continue;
					}

					// else it's a bit more complicated, there might
					// be a flat maxed out rectangle first, then a
					// triangular cutout or reverse; to find these
					// keep track of the current x values
					var x1old = x1, x2old = x2;

					// clip the y values, without shortcutting, we
					// go through all cases in turn

					// 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) {
						ctx.lineTo(axisx.p2c(x1old), axisy.p2c(y1));
						// it goes to (x1, y1), but we fill that below
					}

					// fill triangular section, this sometimes result
					// in redundant points if (x1, y1) hasn't changed
					// from previous line to, but we just ignore that
					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) {
						ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
						ctx.lineTo(axisx.p2c(x2old), axisy.p2c(y2));
					}
				}
			}

			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, shadow, axisx, axisy, symbol) {
				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();
					x = axisx.p2c(x);
					y = axisy.p2c(y) + offset;
					if (symbol == "circle")
						ctx.arc(x, y, radius, 0, shadow ? Math.PI : Math.PI * 2, false);
					else
						symbol(ctx, x, y, radius, shadow);
					ctx.closePath();

					if (fillStyle) {
						ctx.fillStyle = fillStyle;
						ctx.fill();
					}
					ctx.stroke();
				}
			}

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

			var lw = series.points.lineWidth,
				sw = series.shadowSize,
				radius = series.points.radius,
				symbol = series.points.symbol;
			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, true,
					series.xaxis, series.yaxis, symbol);

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

			ctx.lineWidth = lw;
			ctx.strokeStyle = series.color;
			plotPoints(series.datapoints, radius,
				getFillStyle(series.points, series.color), 0, false,
				series.xaxis, series.yaxis, symbol);
			ctx.restore();
		}

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

			// in horizontal mode, we start the bar from the left
			// instead of from the bottom so it appears to be
			// horizontal rather than vertical
			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 (lineWidth > 0 && (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, series.bars.lineWidth);
				}
			}

			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 (var 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 = series.length - 1; i >= 0; --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;

				// with inverse transforms, we can't use the maxx/maxy
				// optimization, sadly
				if (axisx.options.inverseTransform)
					maxx = Number.MAX_VALUE;
				if (axisy.options.inverseTransform)
					maxy = Number.MAX_VALUE;

				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 onMouseLeave(e) {
			if (options.grid.hoverable)
				triggerClickHoverEvent("plothover", e,
					function (s) { return 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(),
				canvasX = event.pageX - offset.left - plotOffset.left,
				canvasY = event.pageY - offset.top - plotOffset.top,
				pos = canvasToAxisCoords({ left: canvasX, top: canvasY });

			pos.pageX = event.pageX;
			pos.pageY = event.pageY;

			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[0] == item.datapoint[0] &&
							h.point[1] == item.datapoint[1]))
						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") {
				var ps = s.datapoints.pointsize;
				point = s.datapoints.points.slice(ps * point, ps * (point + 1));
			}

			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,
				x = axisx.p2c(x),
				y = axisy.p2c(y);

			octx.beginPath();
			if (series.points.symbol == "circle")
				octx.arc(x, y, radius, 0, 2 * Math.PI, false);
			else
				series.points.symbol(octx, x, y, radius, false);
			octx.closePath();
			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, series.bars.lineWidth);
		}

		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") {
						var co = $.color.parse(defaultColor);
						if (c.brightness != null)
							co = co.scale('rgb', c.brightness)
						if (c.opacity != null)
							co.a *= c.opacity;
						c = co.toString();
					}
					gradient.addColorStop(i / (l - 1), c);
				}

				return gradient;
			}
		}
	}

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

	$.plot.version = "0.7";

	$.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, padNext = 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;
					case '0': c = ""; padNext = true; break;
				}
				if (c && padNext) {
					c = leftPad(c);
					padNext = false;
				}
				r.push(c);
				if (!padNext)
					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);
