/*! Javascript plotting library for jQuery, v. 0.7.
 *
 * Released under the MIT license by IOLA, December 2007.
 *
 */

// first an inline dependency, jquery.colorhelpers.js, we inline it here
// for convenience

/* Plugin for jQuery for working with colors.
 *
 * Version 1.1.
 *
 * Inspiration from jQuery color animation plugin by John Resig.
 *
 * Released under the MIT license by Ole Laursen, October 2009.
 *
 * Examples:
 *
 *   $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
 *   var c = $.color.extract($("#mydiv"), 'background-color');
 *   console.log(c.r, c.g, c.b, c.a);
 *   $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
 *
 * Note that .scale() and .add() return the same modified object
 * instead of making a new one.
 *
 * V. 1.1: Fix error handling so e.g. parsing an empty string does
 * produce a color rather than just crashing.
 */
(function(B){B.color={};B.color.make=function(F,E,C,D){var G={};G.r=F||0;G.g=E||0;G.b=C||0;G.a=D!=null?D:1;G.add=function(J,I){for(var H=0;H<J.length;++H){G[J.charAt(H)]+=I}return G.normalize()};G.scale=function(J,I){for(var H=0;H<J.length;++H){G[J.charAt(H)]*=I}return G.normalize()};G.toString=function(){if(G.a>=1){return"rgb("+[G.r,G.g,G.b].join(",")+")"}else{return"rgba("+[G.r,G.g,G.b,G.a].join(",")+")"}};G.normalize=function(){function H(J,K,I){return K<J?J:(K>I?I:K)}G.r=H(0,parseInt(G.r),255);G.g=H(0,parseInt(G.g),255);G.b=H(0,parseInt(G.b),255);G.a=H(0,G.a,1);return G};G.clone=function(){return B.color.make(G.r,G.b,G.g,G.a)};return G.normalize()};B.color.extract=function(D,C){var E;do{E=D.css(C).toLowerCase();if(E!=""&&E!="transparent"){break}D=D.parent()}while(!B.nodeName(D.get(0),"body"));if(E=="rgba(0, 0, 0, 0)"){E="transparent"}return B.color.parse(E)};B.color.parse=function(F){var E,C=B.color.make;if(E=/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(F)){return C(parseInt(E[1],10),parseInt(E[2],10),parseInt(E[3],10))}if(E=/rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(F)){return C(parseInt(E[1],10),parseInt(E[2],10),parseInt(E[3],10),parseFloat(E[4]))}if(E=/rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(F)){return C(parseFloat(E[1])*2.55,parseFloat(E[2])*2.55,parseFloat(E[3])*2.55)}if(E=/rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(F)){return C(parseFloat(E[1])*2.55,parseFloat(E[2])*2.55,parseFloat(E[3])*2.55,parseFloat(E[4]))}if(E=/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(F)){return C(parseInt(E[1],16),parseInt(E[2],16),parseInt(E[3],16))}if(E=/#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(F)){return C(parseInt(E[1]+E[1],16),parseInt(E[2]+E[2],16),parseInt(E[3]+E[3],16))}var D=B.trim(F).toLowerCase();if(D=="transparent"){return C(255,255,255,0)}else{E=A[D]||[0,0,0];return C(E[0],E[1],E[2])}};var A={aqua:[0,255,255],azure:[240,255,255],beige:[245,245,220],black:[0,0,0],blue:[0,0,255],brown:[165,42,42],cyan:[0,255,255],darkblue:[0,0,139],darkcyan:[0,139,139],darkgrey:[169,169,169],darkgreen:[0,100,0],darkkhaki:[189,183,107],darkmagenta:[139,0,139],darkolivegreen:[85,107,47],darkorange:[255,140,0],darkorchid:[153,50,204],darkred:[139,0,0],darksalmon:[233,150,122],darkviolet:[148,0,211],fuchsia:[255,0,255],gold:[255,215,0],green:[0,128,0],indigo:[75,0,130],khaki:[240,230,140],lightblue:[173,216,230],lightcyan:[224,255,255],lightgreen:[144,238,144],lightgrey:[211,211,211],lightpink:[255,182,193],lightyellow:[255,255,224],lime:[0,255,0],magenta:[255,0,255],maroon:[128,0,0],navy:[0,0,128],olive:[128,128,0],orange:[255,165,0],pink:[255,192,203],purple:[128,0,128],violet:[128,0,128],red:[255,0,0],silver:[192,192,192],white:[255,255,255],yellow:[255,255,0]}})(jQuery);

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

    var series = [],
      options = {
        // the color theme used for graphs
        colors: ["#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed"],
        legend: {
          show: true,
          noColumns: 1, // number of colums in legend table
          labelFormatter: null, // fn: string -> string
          labelBoxBorderColor: "#ccc", // border color for the little label boxes
          container: null, // container (as jQuery object) to put legend in, null means default on top of graph
          position: "ne", // position of default legend container within plot
          margin: 5, // distance from grid edge to default legend container within plot
          backgroundColor: null, // null means auto-detect
          backgroundOpacity: 0.85 // set to 0 to avoid background
        },
        xaxis: {
          show: null, // null = auto-detect, true = always, false = never
          position: "bottom", // or "top"
          mode: null, // null or "time"
          color: null, // base color, labels, ticks
          tickColor: null, // possibly different color of ticks, e.g. "rgba(0,0,0,0.15)"
          transform: null, // null or f: number -> number to transform axis
          inverseTransform: null, // if transform is set, this should be the inverse function
          min: null, // min. value to show, null means set automatically
          max: null, // max. value to show, null means set automatically
          autoscaleMargin: null, // margin in % to add if auto-setting min/max
          ticks: null, // either [1, 3] or [[1, "a"], 3] or (fn: axis info -> ticks) or app. number of ticks for auto-ticks
          tickFormatter: null, // fn: number -> string
          labelWidth: null, // size of tick labels in pixels
          labelHeight: null,
          reserveSpace: null, // whether to reserve space even if axis isn't shown
          tickLength: null, // size in pixels of ticks, or "full" for whole line
          alignTicksWithAxis: null, // axis number or null for no sync

          // mode specific options
          tickDecimals: null, // no. of decimals, null means auto
          tickSize: null, // number or [number, "unit"]
          minTickSize: null, // number or [number, "unit"]
          monthNames: null, // list of names of months
          timeformat: null, // format string to use
          twelveHourClock: false // 12 or 24 time in time mode
        },
        yaxis: {
          autoscaleMargin: 0.02,
          position: "left" // or "right"
        },
        xaxes: [],
        yaxes: [],
        series: {
          points: {
            show: false,
            radius: 3,
            lineWidth: 2, // in pixels
            fill: true,
            fillColor: "#ffffff",
            symbol: "circle" // or callback
          },
          lines: {
            // we don't put in show: false so we can see
            // whether lines were actively disabled
            lineWidth: 2, // in pixels
            fill: false,
            fillColor: null,
            steps: false
          },
          bars: {
            show: false,
            lineWidth: 2, // in pixels
            barWidth: 1, // in units of the x axis
            fill: true,
            fillColor: null,
            align: "left", // or "center"
            horizontal: false
          },
          shadowSize: 3
        },
        grid: {
          show: true,
          aboveData: false,
          color: "#545454", // primary color used for outline and labels
          backgroundColor: null, // null for transparent, else color
          borderColor: null, // set if different from the grid color
          tickColor: null, // color for the ticks, e.g. "rgba(0,0,0,0.15)"
          labelMargin: 5, // in pixels
          axisMargin: 8, // in pixels
          borderWidth: 2, // in pixels
          minBorderMargin: null, // in pixels, null means taken from points radius
          markings: null, // array of ranges or fn: axes -> array of ranges
          markingsColor: "#f4f4f4",
          markingsLineWidth: 2,
          // interactive stuff
          clickable: false,
          hoverable: false,
          autoHighlight: true, // highlight in case mouse is near
          mouseActiveRadius: 10 // how far the mouse can be away to activate an item
        },
        hooks: {}
      },
      canvas = null,      // the canvas for the plot itself
      overlay = null,     // canvas for interactive stuff on top of plot
      eventHolder = null, // jQuery object that events should be bound to
      ctx = null, octx = null,
      xaxes = [], yaxes = [],
      plotOffset = { left: 0, right: 0, top: 0, bottom: 0},
      canvasWidth = 0, canvasHeight = 0,
      plotWidth = 0, plotHeight = 0,
      hooks = {
        processOptions: [],
        processRawData: [],
        processDatapoints: [],
        drawSeries: [],
        draw: [],
        bindEvents: [],
        drawOverlay: [],
        shutdown: []
      },
      plot = this;

    // public functions
    plot.setData = setData;
    plot.setupGrid = setupGrid;
    plot.draw = draw;
    plot.getPlaceholder = function() { return placeholder; };
    plot.getCanvas = function() { return canvas; };
    plot.getPlotOffset = function() { return plotOffset; };
    plot.width = function () { return plotWidth; };
    plot.height = function () { return plotHeight; };
    plot.offset = function () {
      var o = eventHolder.offset();
      o.left += plotOffset.left;
      o.top += plotOffset.top;
      return o;
    };
    plot.getData = function () { return series; };
    plot.getAxes = function () {
      var res = {}, i;
      $.each(xaxes.concat(yaxes), function (_, axis) {
        if (axis)
          res[axis.direction + (axis.n != 1 ? axis.n : "") + "axis"] = axis;
      });
      return res;
    };
    plot.getXAxes = function () { return xaxes; };
    plot.getYAxes = function () { return yaxes; };
    plot.c2p = canvasToAxisCoords;
    plot.p2c = axisToCanvasCoords;
    plot.getOptions = function () { return options; };
    plot.highlight = highlight;
    plot.unhighlight = unhighlight;
    plot.triggerRedrawOverlay = triggerRedrawOverlay;
    plot.pointOffset = function(point) {
      return {
        left: parseInt(xaxes[axisNumber(point, "x") - 1].p2c(+point.x) + plotOffset.left),
        top: parseInt(yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top)
      };
    };
    plot.shutdown = shutdown;
    plot.resize = function () {
      getCanvasDimensions();
      resizeCanvas(canvas);
      resizeCanvas(overlay);
    };

    // public attributes
    plot.hooks = hooks;

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


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

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

    function parseOptions(opts) {
      var i;

      $.extend(true, options, opts);

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

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

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

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

      // backwards compatibility, to be removed in future
      if (options.xaxis.noTicks && options.xaxis.ticks == null)
        options.xaxis.ticks = options.xaxis.noTicks;
      if (options.yaxis.noTicks && options.yaxis.ticks == null)
        options.yaxis.ticks = options.yaxis.noTicks;
      if (options.x2axis) {
        options.xaxes[1] = $.extend(true, {}, options.xaxis, options.x2axis);
        options.xaxes[1].position = "top";
      }
      if (options.y2axis) {
        options.yaxes[1] = $.extend(true, {}, options.yaxis, options.y2axis);
        options.yaxes[1].position = "right";
      }
      if (options.grid.coloredAreas)
        options.grid.markings = options.grid.coloredAreas;
      if (options.grid.coloredAreasColor)
        options.grid.markingsColor = options.grid.coloredAreasColor;
      if (options.lines)
        $.extend(true, options.series.lines, options.lines);
      if (options.points)
        $.extend(true, options.series.points, options.points);
      if (options.bars)
        $.extend(true, options.series.bars, options.bars);
      if (options.shadowSize != null)
        options.series.shadowSize = options.shadowSize;

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

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

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

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

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

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

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

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

      return res;
    }

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

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

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

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

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

      return res;
    }

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

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

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

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

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

      return res;
    }

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

      return axes[number - 1];
    }

    function fillInSeriesOptions() {
      var i;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

          s.datapoints.format = format;
        }

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

        s.datapoints.pointsize = format.length;

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

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

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

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

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

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

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

              points[k + m] = val;
            }
          }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

      $(c).appendTo(placeholder);

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

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

      return c;
    }

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

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

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

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

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

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

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

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

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

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

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

        getCanvasDimensions();

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

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

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

        reused = true;
      }

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

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

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

        // reset reused canvases
        plot.resize();

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

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

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

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

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

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

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

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

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

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

      function identity(x) { return x; }

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

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

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

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

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

      if (axis.direction == "x") {
        // to avoid measuring the widths of the labels (it's slow), we
        // construct fixed-size boxes and put the labels inside
        // them, we don't need the exact figures and the
        // fixed-size box content is easy to center
        if (w == null)
          w = Math.floor(canvasWidth / (ticks.length > 0 ? ticks.length : 1));

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

      // first calculate the plot and axis box dimensions

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

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

        setRange(axis);
      });

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

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

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

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

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

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

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

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

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

        insertAxisLabels();
      }

      insertLegend();
    }

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

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

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

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

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

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

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

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


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

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

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

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

          size *= magn;
        }

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

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

          var step = tickSize * timeUnitSize[unit];

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

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


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

          return ticks;
        };

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

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

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

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

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

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

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

        size *= magn;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

      var grid = options.grid;

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

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

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

      executeHooks(hooks.draw, [ctx]);

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

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

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

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

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

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

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

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

    function drawGrid() {
      var i;

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

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

          markings = markings(axes);
        }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

          xoff = yoff = 0;

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

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

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

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

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

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

        ctx.stroke();
      }


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

      ctx.restore();
    }

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

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

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

          var pos = {}, align;

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

          pos.width = axis.labelWidth;

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

          html.push('<div class="tickLabel" style="' + style.join(';') + '">' + tick.label + '</div>');
        }
        html.push('</div>');
      }

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

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

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

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

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

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

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

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

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

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

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

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

      function plotLineArea(datapoints, axisx, axisy) {
        var points = datapoints.points,
          ps = datapoints.pointsize,
          bottom = Math.min(Math.max(0, axisy.min), axisy.max),
          i = 0, top, areaOpen = false,
          ypos = 1, segmentStart = 0, segmentEnd = 0;

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

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

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

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

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

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

          // clip x values

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

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

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

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

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

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

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

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

          // if the x value was changed we got a rectangle
          // to fill
          if (x1 != x1old) {
            ctx.lineTo(axisx.p2c(x1old), axisy.p2c(y1));
            // it goes to (x1, y1), but we fill that below
          }

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

          // fill the other rectangle if it's there
          if (x2 != x2old) {
            ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
            ctx.lineTo(axisx.p2c(x2old), axisy.p2c(y2));
          }
        }
      }

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

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

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

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

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

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

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

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

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

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

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

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

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

      // in horizontal mode, we start the bar from the left
      // instead of from the bottom so it appears to be
      // horizontal rather than vertical
      if (horizontal) {
        drawBottom = drawRight = drawTop = true;
        drawLeft = false;
        left = b;
        right = x;
        top = y + barLeft;
        bottom = y + barRight;

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

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

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

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

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

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

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

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

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

      // draw outline
      if (lineWidth > 0 && (drawLeft || drawRight || drawTop || drawBottom)) {
        c.beginPath();

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

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

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

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

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

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

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

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

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

      if (!options.legend.show)
        return;

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

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

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

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

      if (fragments.length == 0)
        return;

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


    // interactive features

    var highlights = [],
      redrawTimeout = null;

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

      for (i = series.length - 1; i >= 0; --i) {
        if (!seriesFilter(series[i]))
          continue;

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

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

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

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

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

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

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

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

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

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

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

      return null;
    }

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

    function onMouseLeave(e) {
      if (options.grid.hoverable)
        triggerClickHoverEvent("plothover", e,
          function (s) { return false; });
    }

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

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

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

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

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

      if (options.grid.autoHighlight) {
        // clear auto-highlights
        for (var i = 0; i < highlights.length; ++i) {
          var h = highlights[i];
          if (h.auto == eventname &&
            !(item && h.series == item.series &&
              h.point[0] == item.datapoint[0] &&
              h.point[1] == item.datapoint[1]))
            unhighlight(h.series, h.point);
        }

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

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

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

    function drawOverlay() {
      redrawTimeout = null;

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

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

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

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

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

      if (typeof point == "number") {
        var ps = s.datapoints.pointsize;
        point = s.datapoints.points.slice(ps * point, ps * (point + 1));
      }

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

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

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

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

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

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

        triggerRedrawOverlay();
      }
    }

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

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

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

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

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

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

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

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

        return gradient;
      }
    }
  }

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

  $.plot.version = "0.7";

  $.plot.plugins = [];

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

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

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

      if (escape) {
        switch (c) {
          case 'h': c = "" + hours; break;
          case 'H': c = leftPad(hours); break;
          case 'M': c = leftPad(d.getUTCMinutes()); break;
          case 'S': c = leftPad(d.getUTCSeconds()); break;
          case 'd': c = "" + d.getUTCDate(); break;
          case 'm': c = "" + (d.getUTCMonth() + 1); break;
          case 'y': c = "" + d.getUTCFullYear(); break;
          case 'b': c = "" + monthNames[d.getUTCMonth()]; break;
          case 'p': c = (isAM) ? ("" + "am") : ("" + "pm"); break;
          case 'P': c = (isAM) ? ("" + "AM") : ("" + "PM"); break;
          case '0': c = ""; padNext = true; break;
        }
        if (c && padNext) {
          c = leftPad(c);
          padNext = false;
        }
        r.push(c);
        if (!padNext)
          escape = false;
      }
      else {
        if (c == "%")
          escape = true;
        else
          r.push(c);
      }
    }
    return r.join("");
  };

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

})(jQuery);
