/*! 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+=I}return G.normalize()};G.scale=function(J,I){for(var H=0;H<J.length;++H){G*=I}return G.normalize()};G.toString=function(){if(G.a>=1){return“rgb(”+.join(“,”)+“)”}else{return“rgba(”+.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*({1,3})s*,s*([0-9]{1,3})s*,s*([0-9]{1,3})s*)/.exec(F)){return C(parseInt(E,10),parseInt(E,10),parseInt(E,10))}if(E=/rgba(s*({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,10),parseInt(E,10),parseInt(E,10),parseFloat(E))}if(E=/rgb(s*(+(?:.[0-9]+)?)%s*,s*(+(?:.[0-9]+)?)%s*,s*(+(?:.[0-9]+)?)%s*)/.exec(F)){return C(parseFloat(E)*2.55,parseFloat(E)*2.55,parseFloat(E)*2.55)}if(E=/rgba(s*(+(?:.[0-9]+)?)%s*,s*(+(?:.[0-9]+)?)%s*,s*(+(?:.[0-9]+)?)%s*,s*(+(?:.[0-9]+)?)s*)/.exec(F)){return C(parseFloat(E)*2.55,parseFloat(E)*2.55,parseFloat(E)*2.55,parseFloat(E))}if(E=/#({2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(F)){return C(parseInt(E,16),parseInt(E,16),parseInt(E,16))}if(E=/#()([a-fA-F0-9])()/.exec(F)){return C(parseInt(E+E,16),parseInt(E+E,16),parseInt(E+E,16))}var D=B.trim(F).toLowerCase();if(D==“transparent”){return C(255,255,255,0)}else{E=A||[0,0,0];return C(E,E,E)}};var A={aqua:,azure:,beige:,black:,blue:,brown:,cyan:,darkblue:,darkcyan:,darkgrey:,darkgreen:,darkkhaki:,darkmagenta:,darkolivegreen:,darkorange:,darkorchid:,darkred:,darksalmon:,darkviolet:,fuchsia:,gold:,green:,indigo:,khaki:,lightblue:,lightcyan:,lightgreen:,lightgrey:,lightpink:,lightyellow:,lime:,magenta:,maroon:,navy:,olive:,orange:,pink:,purple:,violet:,red:,silver:,white:,yellow:}})(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);