//Flotr 0.2.0-alpha Copyright (c) 2009 Bas Wenneker, <http://solutoire.com>, MIT License.
/* $Id: flotr.js 82 2009-01-12 19:19:31Z fabien.menager $ */

var Flotr = {
	version: '0.2.0-alpha',
	author: 'Bas Wenneker',
	website: 'http://www.solutoire.com',
	/**
	 * An object of the default registered graph types. Use Flotr.register(type, functionName)
	 * to add your own type.
	 */
	_registeredTypes:{
		'lines': 'drawSeriesLines',
		'points': 'drawSeriesPoints',
		'bars': 'drawSeriesBars',
		'candles': 'drawSeriesCandles',
		'pie': 'drawSeriesPie'
	},
	/**
	 * Can be used to register your own chart type. Default types are 'lines', 'points' and 'bars'.
	 * This is still experimental.
	 * @todo Test and confirm.
	 * @param {String} type - type of chart, like 'pies', 'bars' etc.
	 * @param {String} functionName - Name of the draw function, like 'drawSeriesPies', 'drawSeriesBars' etc.
	 */
	register: function(type, functionName){
		Flotr._registeredTypes[type] = functionName+'';	
	},
	/**
	 * Draws the graph. This function is here for backwards compatibility with Flotr version 0.1.0alpha.
	 * You could also draw graphs by directly calling Flotr.Graph(element, data, options).
	 * @param {Element} el - element to insert the graph into
	 * @param {Object} data - an array or object of dataseries
	 * @param {Object} options - an object containing options
	 * @param {Class} _GraphKlass_ - (optional) Class to pass the arguments to, defaults to Flotr.Graph
	 * @return {Class} returns a new graph object and of course draws the graph.
	 */
	draw: function(el, data, options, _GraphKlass_){	
		_GraphKlass_ = _GraphKlass_ || Flotr.Graph;
		return new _GraphKlass_(el, data, options);
	},
	/**
	 * Collects dataseries from input and parses the series into the right format. It returns an Array 
	 * of Objects each having at least the 'data' key set.
	 * @param {Array/Object} data - Object or array of dataseries
	 * @return {Array} Array of Objects parsed into the right format ({(...,) data: [[x1,y1], [x2,y2], ...] (, ...)})
	 */
	getSeries: function(data){
		return data.collect(function(serie){
			var i, serie = (serie.data) ? Object.clone(serie) : {'data': serie};
			for (i = serie.data.length-1; i > -1; --i) {
				serie.data[i][1] = (serie.data[i][1] === null ? null : parseFloat(serie.data[i][1])); 
			}
			return serie;
		});
	},
	/**
	 * Recursively merges two objects.
	 * @param {Object} src - source object (likely the object with the least properties)
	 * @param {Object} dest - destination object (optional, object with the most properties)
	 * @return {Object} recursively merged Object
	 */
	merge: function(src, dest){
		var result = dest || {};
		for(var i in src){
			result[i] = (src[i] != null && typeof(src[i]) == 'object' && !(src[i].constructor == Array || src[i].constructor == RegExp) && !Object.isElement(src[i])) ? Flotr.merge(src[i], dest[i]) : result[i] = src[i];		
		}
		return result;
	},	
	/**
	 * Function calculates the ticksize and returns it.
	 * @param {Integer} noTicks - number of ticks
	 * @param {Integer} min - lower bound integer value for the current axis
	 * @param {Integer} max - upper bound integer value for the current axis
	 * @param {Integer} decimals - number of decimals for the ticks
	 * @return {Integer} returns the ticksize in pixels
	 */
	getTickSize: function(noTicks, min, max, decimals){
		var delta = (max - min) / noTicks;	
		var magn = Flotr.getMagnitude(delta);
		
		// Norm is between 1.0 and 10.0.
		var norm = delta / magn;
		
		var tickSize = 10;
		if(norm < 1.5) tickSize = 1;
		else if(norm < 2.25) tickSize = 2;
		else if(norm < 3) tickSize = ((decimals == 0) ? 2 : 2.5);
		else if(norm < 7.5) tickSize = 5;
		
		return tickSize * magn;
	},
	/**
	 * Default tick formatter.
	 * @param {String/Integer} val - tick value integer
	 * @return {String} formatted tick string
	 */
	defaultTickFormatter: function(val){
		return val+'';
	},
	/**
	 * Formats the mouse tracker values.
	 * @param {Object} obj - Track value Object {x:..,y:..}
	 * @return {String} Formatted track string
	 */
	defaultTrackFormatter: function(obj){
		return '('+obj.x+', '+obj.y+')';
	}, 
	defaultPieLabelFormatter: function(slice) {
	  return (slice.fraction*100).toFixed(2)+'%';
	},
	/**
	 * Returns the magnitude of the input value.
	 * @param {Integer/Float} x - integer or float value
	 * @return {Integer/Float} returns the magnitude of the input value
	 */
	getMagnitude: function(x){
		return Math.pow(10, Math.floor(Math.log(x) / Math.LN10));
	},
	toPixel: function(val){
		return Math.floor(val)+0.5;//((val-Math.round(val) < 0.4) ? (Math.floor(val)-0.5) : val);
	},
	toRad: function(angle){
		return -angle * (Math.PI/180);
	},
	/**
	 * Parses a color string and returns a corresponding Color.
	 * @param {String} str - string thats representing a color
	 * @return {Color} returns a Color object or false
	 */
	parseColor: function(str){
		if (str instanceof Flotr.Color) return str;
		
		var result, Color = Flotr.Color;

		// rgb(num,num,num)
		if((result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(str)))
			return new Color(parseInt(result[1]), parseInt(result[2]), parseInt(result[3]));
	
		// rgba(num,num,num,num)
		if((result = /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(str)))
			return new Color(parseInt(result[1]), parseInt(result[2]), parseInt(result[3]), parseFloat(result[4]));
			
		// rgb(num%,num%,num%)
		if((result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(str)))
			return new Color(parseFloat(result[1])*2.55, parseFloat(result[2])*2.55, parseFloat(result[3])*2.55);
	
		// rgba(num%,num%,num%,num)
		if((result = /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(str)))
			return new Color(parseFloat(result[1])*2.55, parseFloat(result[2])*2.55, parseFloat(result[3])*2.55, parseFloat(result[4]));
			
		// #a0b1c2
		if((result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(str)))
			return new Color(parseInt(result[1],16), parseInt(result[2],16), parseInt(result[3],16));
	
		// #fff
		if((result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(str)))
			return new Color(parseInt(result[1]+result[1],16), parseInt(result[2]+result[2],16), parseInt(result[3]+result[3],16));

		// Otherwise, we're most likely dealing with a named color.
		var name = str.strip().toLowerCase();
		if(name == 'transparent'){
			return new Color(255, 255, 255, 0);
		}
		return ((result = Color.lookupColors[name])) ? new Color(result[0], result[1], result[2]) : false;
	},
	/**
	 * Extracts the background-color of the passed element.
	 * @param {Element} element
	 * @return {String} color string
	 */
	extractColor: function(element){
		var color;
		// Loop until we find an element with a background color and stop when we hit the body element. 
		do {
			color = element.getStyle('background-color').toLowerCase();
			if(!(color == '' || color == 'transparent')) break;
			element = element.up(0);
		} while(!element.nodeName.match(/^body$/i));

		// Catch Safari's way of signaling transparent.
		return (color == 'rgba(0, 0, 0, 0)') ? 'transparent' : color;
	}
};
/**
 * Flotr Graph class that plots a graph on creation.

 */
Flotr.Graph = Class.create({
	/**
	 * Flotr Graph constructor.
	 * @param {Element} el - element to insert the graph into
	 * @param {Object} data - an array or object of dataseries
 	 * @param {Object} options - an object containing options
	 */
	initialize: function(el, data, options){
		this.el = $(el);
		
		if (!this.el) throw 'The target container doesn\'t exist';
		
		this.data = data;
		this.series = Flotr.getSeries(data);
		this.setOptions(options);
		
		// Initialize some variables
		this.lastMousePos = { pageX: null, pageY: null };
		this.selection = { first: { x: -1, y: -1}, second: { x: -1, y: -1} };
		this.prevSelection = null;
		this.selectionInterval = null;
		this.ignoreClick = false;   
		this.prevHit = null;
    
		// Create and prepare canvas.
		this.constructCanvas();
		
		// Add event handlers for mouse tracking, clicking and selection
		this.initEvents();
		
		this.findDataRanges();
		this.calculateTicks(this.axes.x);
		this.calculateTicks(this.axes.x2);
		this.calculateTicks(this.axes.y);
		this.calculateTicks(this.axes.y2);
		
		this.calculateSpacing();
		this.draw();
		this.insertLegend();
    
    // Graph and Data tabs
    if (this.options.spreadsheet.show) 
      this.constructTabs();
	},
	/**
	 * Sets options and initializes some variables and color specific values, used by the constructor. 
	 * @param {Object} opts - options object
	 */
  setOptions: function(opts){
    var options = {
      colors: ['#FFFFFF', '#FFFFFF', '#FFFFFF', '#FFFFFF', '#FFFFFF'], //=> The default colorscheme. When there are > 5 series, additional colors are generated.
      title: null,
      subtitle: null,
      legend: {
        show: true,            // => setting to true will show the legend, hide otherwise
        noColumns: 1,          // => number of colums in legend table // @todo: doesn't work for HtmlText = false
        labelFormatter: Prototype.K, // => fn: string -> string
        labelBoxBorderColor: '#FFFFFF', // => border color for the little label boxes
        labelBoxWidth: 14,
        labelBoxHeight: 10,
        labelBoxMargin: 5,
        container: null,       // => container (as jQuery object) to put legend in, null means default on top of graph
        position: 'nw',        // => 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, set to 1 for a solid background
      },
      xaxis: {
        ticks: null,           // => format: either [1, 3] or [[1, 'a'], 3]
        showLabels: true,      // => setting to true will show the axis ticks labels, hide otherwise
        labelsAngle: 0,        // => Labels' angle, in degrees
        title: null,           // => axis title
        titleAngle: 0,         // => axis title's angle, in degrees
        noTicks: 5,            // => number of ticks for automagically generated ticks
        tickFormatter: Flotr.defaultTickFormatter, // => fn: number -> string
        tickDecimals: null,    // => no. of decimals, null means auto
        min: null,             // => min. value to show, null means set automatically
        max: null,             // => max. value to show, null means set automatically
        autoscaleMargin: 0,    // => margin in % to add if auto-setting min/max
        color: null
      },
      x2axis: {},
      yaxis: {
        ticks: null,           // => format: either [1, 3] or [[1, 'a'], 3]
        showLabels: true,      // => setting to true will show the axis ticks labels, hide otherwise
        labelsAngle: 0,        // => Labels' angle, in degrees
        title: null,           // => axis title
        titleAngle: 90,        // => axis title's angle, in degrees
        noTicks: 5,            // => number of ticks for automagically generated ticks
        tickFormatter: Flotr.defaultTickFormatter, // => fn: number -> string
        tickDecimals: null,    // => no. of decimals, null means auto
        min: null,             // => min. value to show, null means set automatically
        max: null,             // => max. value to show, null means set automatically
        autoscaleMargin: 0,    // => margin in % to add if auto-setting min/max
        color: null
      },
      y2axis: {
      	titleAngle: 270
      },
      points: {
        show: false,           // => setting to true will show points, false will hide
        radius: 3,             // => point radius (pixels)
        lineWidth: 2,          // => line width in pixels
        fill: true,            // => true to fill the points with a color, false for (transparent) no fill
        fillColor: '#FFFFFF',  // => fill color
        fillOpacity: 0.4
      },
      lines: {
        show: false,           // => setting to true will show lines, false will hide
        lineWidth: 2,          // => line width in pixels
        fill: false,           // => true to fill the area from the line to the x axis, false for (transparent) no fill
        fillColor: null,       // => fill color
        fillOpacity: 0.4       // => opacity of the fill color, set to 1 for a solid fill, 0 hides the fill
      },
      bars: {
        show: false,           // => setting to true will show bars, false will hide
        lineWidth: 2,          // => in pixels
        barWidth: 1,           // => in units of the x axis
        fill: true,            // => true to fill the area from the line to the x axis, false for (transparent) no fill
        fillColor: null,       // => fill color
        fillOpacity: 0.4,      // => opacity of the fill color, set to 1 for a solid fill, 0 hides the fill
        horizontal: false,
        stacked: false
      },
      candles: {
        show: false,           // => setting to true will show candle sticks, false will hide
        lineWidth: 1,          // => in pixels
        wickLineWidth: 1,      // => in pixels
        candleWidth: 0.6,      // => in units of the x axis
        fill: true,            // => true to fill the area from the line to the x axis, false for (transparent) no fill
        upFillColor: '#FFFFFF',// => up sticks fill color
        downFillColor: '#FFFFFF',// => down sticks fill color
        fillOpacity: 0.5,      // => opacity of the fill color, set to 1 for a solid fill, 0 hides the fill
        barcharts: false       // => draw as barcharts (not standard bars but financial barcharts)
      },
      pie: {
        show: false,           // => setting to true will show bars, false will hide
        lineWidth: 1,          // => in pixels
        fill: true,            // => true to fill the area from the line to the x axis, false for (transparent) no fill
        fillColor: null,       // => fill color
        fillOpacity: 0.6,      // => opacity of the fill color, set to 1 for a solid fill, 0 hides the fill
        explode: 6,
        sizeRatio: 0.6,
        startAngle: Math.PI/4,
        labelFormatter: Flotr.defaultPieLabelFormatter,
        pie3D: false,
        pie3DviewAngle: (Math.PI/2 * 0.8),
        pie3DspliceThickness: 20
      },
      grid: {
        color: '#FFFFFF',      // => primary color used for outline and labels
        backgroundColor: null, // => null for transparent, else color
        tickColor: '#FFFFFF',  // => color used for the ticks
        labelMargin: 3,        // => margin in pixels
        verticalLines: true,   // => whether to show gridlines in vertical direction
        horizontalLines: true, // => whether to show gridlines in horizontal direction
        outlineWidth: 2        // => width of the grid outline/border in pixels
      },
      selection: {
        mode: null,            // => one of null, 'x', 'y' or 'xy'
        color: '#FFFFFF',      // => selection box color
        fps: 20                // => frames-per-second
      },
      mouse: {
        track: false,          // => true to track the mouse, no tracking otherwise
        position: 'se',        // => position of the value box (default south-east)
        relative: false,       // => next to the mouse cursor
        trackFormatter: Flotr.defaultTrackFormatter, // => formats the values in the value box
        margin: 5,             // => margin in pixels of the valuebox
        lineColor: '#FFFFFF',  // => line color of points that are drawn when mouse comes near a value of a series
        trackDecimals: 1,      // => decimals for the track values
        sensibility: 2,        // => the lower this number, the more precise you have to aim to show a value
        radius: 3              // => radius of the track point
      },
      shadowSize: 4,           // => size of the 'fake' shadow
      defaultType: 'lines',    // => default series type
      HtmlText: true,          // => wether to draw the text using HTML or on the canvas
      fontSize: 7.5,             // => canvas' text font size
      spreadsheet: {
      	show: false,           // => show the data grid using two tabs
      	tabGraphLabel: 'Graph',
      	tabDataLabel: 'Data',
      	toolbarDownload: 'Download CSV', // @todo: add language support
      	toolbarSelectAll: 'Select all'
      }
    }
    
    options.x2axis = Object.extend(Object.clone(options.xaxis), options.x2axis);
    options.y2axis = Object.extend(Object.clone(options.yaxis), options.y2axis);
    this.options = Flotr.merge((opts || {}), options);
    
    this.axes = {
      x:  {options: this.options.xaxis,  n: 1}, 
      x2: {options: this.options.x2axis, n: 2}, 
      y:  {options: this.options.yaxis,  n: 1}, 
      y2: {options: this.options.y2axis, n: 2}
    };
		
		// Initialize some variables used throughout this function.
		var assignedColors = [],
		    colors = [],
		    ln = this.series.length,
		    neededColors = this.series.length,
		    oc = this.options.colors, 
		    usedColors = [],
		    variation = 0,
		    c, i, j, s, tooClose;

		// Collect user-defined colors from series.
		for(i = neededColors - 1; i > -1; --i){
			c = this.series[i].color;
			if(c != null){
				--neededColors;
				if(Object.isNumber(c)) assignedColors.push(c);
				else usedColors.push(Flotr.parseColor(c));
			}
		}
		
		// Calculate the number of colors that need to be generated.
		for(i = assignedColors.length - 1; i > -1; --i)
			neededColors = Math.max(neededColors, assignedColors[i] + 1);

		// Generate needed number of colors.
		for(i = 0; colors.length < neededColors;){
			c = (oc.length == i) ? new Flotr.Color(100, 100, 100) : Flotr.parseColor(oc[i]);
			
			// Make sure each serie gets a different color.
			var sign = variation % 2 == 1 ? -1 : 1;
			var factor = 1 + sign * Math.ceil(variation / 2) * 0.2;
			c.scale(factor, factor, factor);

			/**
			 * @todo if we're getting too close to something else, we should probably skip this one
			 */
			colors.push(c);
			
			if(++i >= oc.length){
				i = 0;
				++variation;
			}
		}
	
		// Fill the options with the generated colors.
		for(i = 0, j = 0; i < ln; ++i){
			s = this.series[i];

			// Assign the color.
			if(s.color == null){
				s.color = colors[j++].toString();
			}else if(Object.isNumber(s.color)){
				s.color = colors[s.color].toString();
			}
			
      if (!s.xaxis) s.xaxis = this.axes.x;
           if (s.xaxis == 1) s.xaxis = this.axes.x;
      else if (s.xaxis == 2) s.xaxis = this.axes.x2;
  
      if (!s.yaxis) s.yaxis = this.axes.y;
           if (s.yaxis == 1) s.yaxis = this.axes.y;
      else if (s.yaxis == 2) s.yaxis = this.axes.y2;
			
			// Apply missing options to the series.
			s.lines   = Object.extend(Object.clone(this.options.lines), s.lines);
			s.points  = Object.extend(Object.clone(this.options.points), s.points);
			s.bars    = Object.extend(Object.clone(this.options.bars), s.bars);
			s.candles = Object.extend(Object.clone(this.options.candles), s.candles);
			s.pie     = Object.extend(Object.clone(this.options.pie), s.pie);
			s.mouse   = Object.extend(Object.clone(this.options.mouse), s.mouse);
			
			if(s.shadowSize == null) s.shadowSize = this.options.shadowSize;
		}
	},
	/**
	 * Initializes the canvas and it's overlay canvas element. When the browser is IE, this makes use 
	 * of excanvas. The overlay canvas is inserted for displaying interactions. After the canvas elements
	 * are created, the elements are inserted into the container element.
	 */
	constructCanvas: function(){
		var el = this.el,
			size, c, oc;
		
  	this.canvas = el.select('.flotr-canvas')[0];
		this.overlay = el.select('.flotr-overlay')[0];
		
		el.childElements().invoke('remove');

		// For positioning labels and overlay.
		el.setStyle({position:'relative', cursor:'default'});

		this.canvasWidth = el.getWidth();
		this.canvasHeight = el.getHeight();
		size = {'width': this.canvasWidth, 'height': this.canvasHeight};

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

		// Insert main canvas.
		if (!this.canvas) {
			c = this.canvas = new Element('canvas', size);
			c.className = 'flotr-canvas';
			c = c.writeAttribute('style', 'position:absolute;left:0px;top:0px;');
		} else {
			c = this.canvas.writeAttribute(size);
		}
		el.insert(c);
		
		if(Prototype.Browser.IE){
			c = window.G_vmlCanvasManager.initElement(c);
		}
		this.ctx = c.getContext('2d');
    
		// Insert overlay canvas for interactive features.
		if (!this.overlay) {
			oc = this.overlay = new Element('canvas', size);
			oc.className = 'flotr-overlay';
			oc = oc.writeAttribute('style', 'position:absolute;left:0px;top:0px;');
		} else {
			oc = this.overlay.writeAttribute(size);
		}
		el.insert(oc);
		
		if(Prototype.Browser.IE){
			oc = window.G_vmlCanvasManager.initElement(oc);
		}
		this.octx = oc.getContext('2d');

		// Enable text functions
		if (window.CanvasText) {
		  CanvasText.enable(this.ctx);
		  CanvasText.enable(this.octx);
		  this.textEnabled = true;
		}
	},
  getTextDimensions: function(text, canvasStyle, HtmlStyle, className) {
    if (!text) return {width:0, height:0};
    
    if (!this.options.HtmlText && this.textEnabled) {
      var bounds = this.ctx.getTextBounds(text, canvasStyle);
      return {
        width: bounds.width+2, 
        height: bounds.height+6
      };
    }
    else {
      var dummyDiv = this.el.insert('<div style="position:absolute;top:-10000px;'+HtmlStyle+'" class="'+className+' flotr-dummy-div">' + text + '</div>').select(".flotr-dummy-div")[0];
      dim = dummyDiv.getDimensions();
      dummyDiv.remove();
      return dim;
    }
  },
	loadDataGrid: function(){
    if (this.seriesData) return this.seriesData;

		var s = this.series;
		var dg = [];

    /* The data grid is a 2 dimensions array. There is a row for each X value.
     * Each row contains the x value and the corresponding y value for each serie ('undefined' if there isn't one)
    **/
		for(i = 0; i < s.length; ++i){
			s[i].data.each(function(v) {
				var x = v[0],
				    y = v[1];
				if (r = dg.find(function(row) {return row[0] == x})) {
					r[i+1] = y;
				}
				else {
					var newRow = [];
					newRow[0] = x;
					newRow[i+1] = y
					dg.push(newRow);
				}
			});
		}
		
    // The data grid is sorted by x value
		dg = dg.sortBy(function(v) {
			return v[0];
		});
		return this.seriesData = dg;
	},
	
	// @todo: make a tab manager (Flotr.Tabs)
  showTab: function(tabName, onComplete){
    var elementsClassNames = 'canvas, .flotr-labels, .flotr-legend, .flotr-legend-bg, .flotr-title, .flotr-subtitle';
    switch(tabName) {
      case 'graph':
        this.datagrid.up().hide();
        this.el.select(elementsClassNames).invoke('show');
        this.tabs.data.removeClassName('selected');
        this.tabs.graph.addClassName('selected');
      break;
      case 'data':
        this.constructDataGrid();
        this.datagrid.up().show();
        this.el.select(elementsClassNames).invoke('hide');
        this.tabs.data.addClassName('selected');
        this.tabs.graph.removeClassName('selected');
      break;
    }
  },
  constructTabs: function(){
    var tabsContainer = new Element('div', {className:'flotr-tabs-group', style:'position:absolute;left:0px;top:'+this.canvasHeight+'px;width:'+this.canvasWidth+'px;'});
    this.el.insert({bottom: tabsContainer});
    this.tabs = {
    	graph: new Element('div', {className:'flotr-tab selected', style:'float:left;'}).update(this.options.spreadsheet.tabGraphLabel),
    	data: new Element('div', {className:'flotr-tab', style:'float:left;'}).update(this.options.spreadsheet.tabDataLabel)
    }
    
    tabsContainer.insert(this.tabs.graph).insert(this.tabs.data);
    
    this.el.setStyle({height: this.canvasHeight+this.tabs.data.getHeight()+2+'px'});

    this.tabs.graph.observe('click', (function() {this.showTab('graph')}).bind(this));
    this.tabs.data.observe('click', (function() {this.showTab('data')}).bind(this));
  },
  
  // @todo: make a spreadsheet manager (Flotr.Spreadsheet)
	constructDataGrid: function(){
    // If the data grid has already been built, nothing to do here
    if (this.datagrid) return this.datagrid;
    
		var i, j, 
        s = this.series,
        datagrid = this.loadDataGrid();

		var t = this.datagrid = new Element('table', {className:'flotr-datagrid', style:'height:100px;'});
		var colgroup = ['<colgroup><col />'];
		
		// First row : series' labels
		var html = ['<tr class="first-row">'];
		html.push('<th>&nbsp;</th>');
		for (i = 0; i < s.length; ++i) {
			html.push('<th scope="col">'+(s[i].label || String.fromCharCode(65+i))+'</th>');
			colgroup.push('<col />');
		}
		html.push('</tr>');
		
		// Data rows
		for (j = 0; j < datagrid.length; ++j) {
			html.push('<tr>');
			for (i = 0; i < s.length+1; ++i) {
        var tag = 'td';
        var content = (datagrid[j][i] != null ? Math.round(datagrid[j][i]*100000)/100000 : '');
        
        if (i == 0) {
          tag = 'th';
          var label;
          if(this.options.xaxis.ticks) {
            var tick = this.options.xaxis.ticks.find(function (x) { return x[0] == datagrid[j][i] });
            if (tick) label = tick[1];
          } 
          else {
            label = this.options.xaxis.tickFormatter(content);
          }
          
          if (label) content = label;
        }

				html.push('<'+tag+(tag=='th'?' scope="row"':'')+'>'+content+'</'+tag+'>');
			}
			html.push('</tr>');
		}
		colgroup.push('</colgroup>');
    t.update(colgroup.join('')+html.join(''));
    
    if (!Prototype.Browser.IE) {
      t.select('td').each(function(td) {
      	td.observe('mouseover', function(e){
      		td = e.element();
      		var siblings = td.previousSiblings();
      		
      		t.select('th[scope=col]')[siblings.length-1].addClassName('hover');
      		t.select('colgroup col')[siblings.length].addClassName('hover');
      	});
      	
      	td.observe('mouseout', function(){
      		t.select('colgroup col.hover, th.hover').each(function(e){e.removeClassName('hover')});
      	});
      });
    }
    
		var toolbar = new Element('div', {className: 'flotr-datagrid-toolbar'}).
	    insert(new Element('button', {type:'button', className:'flotr-datagrid-toolbar-button'}).update(this.options.spreadsheet.toolbarDownload).observe('click', this.downloadCSV.bind(this))).
	    insert(new Element('button', {type:'button', className:'flotr-datagrid-toolbar-button'}).update(this.options.spreadsheet.toolbarSelectAll).observe('click', this.selectAllData.bind(this)));
		
		var container = new Element('div', {className:'flotr-datagrid-container', style:'left:0px;top:0px;width:'+this.canvasWidth+'px;height:'+this.canvasHeight+'px;overflow:auto;'});
		container.insert(toolbar);
		t.wrap(container.hide());
		
		this.el.insert(container);
    return t;
  },
  selectAllData: function(){
    if (this.tabs) {
      var selection, range, doc, win, node = this.constructDataGrid();
  
      this.showTab('data');
      
      // deferred to be able to select the table
      (function () {
        if ((doc = node.ownerDocument) && (win = doc.defaultView) && 
          win.getSelection && doc.createRange && 
          (selection = window.getSelection()) && 
          selection.removeAllRanges) {
           range = doc.createRange();
           range.selectNode(node);
           selection.removeAllRanges();
           selection.addRange(range);
        }
        else if (document.body && document.body.createTextRange && 
          (range = document.body.createTextRange())) {
           range.moveToElementText(node);
           range.select();
        }
      }).defer();
      return true;
    }
    else return false;
  },
  downloadCSV: function(){
    var i, csv = '"x"',
        series = this.series,
        dg = this.loadDataGrid();
    
    for (i = 0; i < series.length; ++i) {
      csv += '%09"'+(series[i].label || String.fromCharCode(65+i))+'"'; // \t
    }
    csv += "%0D%0A"; // \r\n
    
    for (i = 0; i < dg.length; ++i) {
      if (this.options.xaxis.ticks) {
        var tick = this.options.xaxis.ticks.find(function (x) { return x[0] == dg[i][0] });
        if (tick) dg[i][0] = tick[1];
      } else {
        dg[i][0] = this.options.xaxis.tickFormatter(dg[i][0]);
      }
      csv += dg[i].join('%09')+"%0D%0A"; // \t and \r\n
    }
    if (Prototype.Browser.IE) {
      csv = csv.gsub('%09', '\t').gsub('%0A', '\n').gsub('%0D', '\r');
      window.open().document.write(csv);
    }
    else {
      window.open('data:text/csv,'+csv);
    }
  },
	/**
	 * Initializes event some handlers.
	 */
	initEvents: function () {
  	//@todo: maybe stopObserving with only flotr functions
  	this.overlay.stopObserving();
  	this.overlay.observe('mousedown', this.mouseDownHandler.bind(this));
		this.overlay.observe('mousemove', this.mouseMoveHandler.bind(this));
		this.overlay.observe('click', this.clickHandler.bind(this));
	},
	/**
	 * Function determines the min and max values for the xaxis and yaxis.
	 */
	findDataRanges: function(){
		var s = this.series, 
		    a = this.axes;
		
		a.x.datamin = 0;  a.x.datamax  = 0;
		a.x2.datamin = 0; a.x2.datamax = 0;
		a.y.datamin = 0;  a.y.datamax  = 0;
		a.y2.datamin = 0; a.y2.datamax = 0;
		
		if(s.length > 0){
			var i, j, h, x, y, data, xaxis, yaxis;
		
			// Get datamin, datamax start values 
			for(i = 0; i < s.length; ++i) {
				data = s[i].data, 
				xaxis = s[i].xaxis, 
				yaxis = s[i].yaxis;
				
				if (data.length > 0 && !s[i].hide) {
					if (!xaxis.used) xaxis.datamin = xaxis.datamax = data[0][0];
					if (!yaxis.used) yaxis.datamin = yaxis.datamax = data[0][1];
					xaxis.used = true;
					yaxis.used = true;

					for(h = data.length - 1; h > -1; --h){
  					x = data[h][0];
  			         if(x < xaxis.datamin) xaxis.datamin = x;
   					else if(x > xaxis.datamax) xaxis.datamax = x;
  			    
  					for(j = 1; j < data[h].length; j++){
  						y = data[h][j];
  				         if(y < yaxis.datamin) yaxis.datamin = y;
  	  				else if(y > yaxis.datamax) yaxis.datamax = y;
  					}
					}
				}
			}
		}
		
		this.findXAxesValues();
		
		this.calculateRange(a.x);
		this.extendXRangeIfNeededByBar(a.x);
		
		if (a.x2.used) {
			this.calculateRange(a.x2);
		  this.extendXRangeIfNeededByBar(a.x2);
		}
		
		this.calculateRange(a.y);
		this.extendYRangeIfNeededByBar(a.y);
		
		if (a.y2.used) {
  		this.calculateRange(a.y2);
  		this.extendYRangeIfNeededByBar(a.y2);
		}
	},
	/**
	 * Calculates the range of an axis to apply autoscaling.
	 */
	calculateRange: function(axis){
		var o = axis.options,
		  min = o.min != null ? o.min : axis.datamin,
			max = o.max != null ? o.max : axis.datamax,
			margin;

		if(max - min == 0.0){
			var widen = (max == 0.0) ? 1.0 : 0.01;
			min -= widen;
			max += widen;
		}
		axis.tickSize = Flotr.getTickSize(o.noTicks, min, max, o.tickDecimals);

		// Autoscaling.
		if(o.min == null){
			// Add a margin.
			margin = o.autoscaleMargin;
			if(margin != 0){
				min -= axis.tickSize * margin;
				
				// Make sure we don't go below zero if all values are positive.
				if(min < 0 && axis.datamin >= 0) min = 0;
				min = axis.tickSize * Math.floor(min / axis.tickSize);
			}
		}
		if(o.max == null){
			margin = o.autoscaleMargin;
			if(margin != 0){
				max += axis.tickSize * margin;
				if(max > 0 && axis.datamax <= 0) max = 0;				
				max = axis.tickSize * Math.ceil(max / axis.tickSize);
			}
		}
		axis.min = min;
		axis.max = max;
	},
	/**
	 * Bar series autoscaling in x direction.
	 */
	extendXRangeIfNeededByBar: function(axis){
		if(axis.options.max == null){
			var newmax = axis.max,
			    i, s, b, c,
			    stackedSums = [], 
			    lastSerie = null;

			for(i = 0; i < this.series.length; ++i){
				s = this.series[i];
				b = s.bars;
				c = s.candles;
				if(s.axis == axis && (b.show || c.show)) {
					if (!b.horizontal && (b.barWidth + axis.datamax > newmax) || (c.candleWidth + axis.datamax > newmax)){
						newmax = axis.max + s.bars.barWidth;
					}
					if(b.stacked && b.horizontal){
						for (j = 0; j < s.data.length; j++) {
							if (s.bars.show && s.bars.stacked) {
								var x = s.data[j][0];
								stackedSums[x] = (stackedSums[x] || 0) + s.data[j][1];
								lastSerie = s;
							}
						}
				    
						for (j = 0; j < stackedSums.length; j++) {
				    	newmax = Math.max(stackedSums[j], newmax);
						}
					}
				}
			}
			axis.lastSerie = lastSerie;
			axis.max = newmax;
		}
	},
	/**
	 * Bar series autoscaling in y direction.
	 */
	extendYRangeIfNeededByBar: function(axis){
		if(axis.options.max == null){
			var newmax = axis.max,
				  i, s, b, c,
				  stackedSums = [],
				  lastSerie = null;
									
			for(i = 0; i < this.series.length; ++i){
				s = this.series[i];
				b = s.bars;
				c = s.candles;
				if (s.yaxis == axis && b.show && !s.hide) {
					if (b.horizontal && (b.barWidth + axis.datamax > newmax) || (c.candleWidth + axis.datamax > newmax)){
						newmax = axis.max + b.barWidth;
					}
					if(b.stacked && !b.horizontal){
						for (j = 0; j < s.data.length; j++) {
							if (s.bars.show && s.bars.stacked) {
								var x = s.data[j][0];
								stackedSums[x] = (stackedSums[x] || 0) + s.data[j][1];
								lastSerie = s;
							}
						}
						
						for (j = 0; j < stackedSums.length; j++) {
							newmax = Math.max(stackedSums[j], newmax);
						}
					}
				}
			}
			axis.lastSerie = lastSerie;
			axis.max = newmax;
		}
	},
	/** 
	 * Find every values of the x axes
	 */
	findXAxesValues: function(){
		for(i = this.series.length-1; i > -1 ; --i){
			s = this.series[i];
			s.xaxis.values = s.xaxis.values || [];
			for (j = s.data.length-1; j > -1 ; --j){
				s.xaxis.values[s.data[j][0]] = {};
			}
		}
	},
	/**
	 * Calculate axis ticks.
	 * @param {Object} axis - axis object
	 * @param {Object} o - axis options
	 */
	calculateTicks: function(axis){
		var o = axis.options, i, v;
		
		axis.ticks = [];	
		if(o.ticks){
			var ticks = o.ticks, t, label;

			if(Object.isFunction(ticks)){
				ticks = ticks({min: axis.min, max: axis.max});
			}
			
			// Clean up the user-supplied ticks, copy them over.
			for(i = 0; i < ticks.length; ++i){
				t = ticks[i];
				if(typeof(t) == 'object'){
					v = t[0];
					label = (t.length > 1) ? t[1] : o.tickFormatter(v);
				}else{
					v = t;
					label = o.tickFormatter(v);
				}
				axis.ticks[i] = { v: v, label: label };
			}
		}
    else {
			// Round to nearest multiple of tick size.
			var start = axis.tickSize * Math.ceil(axis.min / axis.tickSize),
				  decimals;
			
			// Then store all possible ticks.
			for(i = 0; start + i * axis.tickSize <= axis.max; ++i){
				v = start + i * axis.tickSize;
				
				// Round (this is always needed to fix numerical instability).
				decimals = o.tickDecimals;
				if(decimals == null) decimals = 1 - Math.floor(Math.log(axis.tickSize) / Math.LN10);
				if(decimals < 0) decimals = 0;
				
				v = v.toFixed(decimals);
				axis.ticks.push({ v: v, label: o.tickFormatter(v) });
			}
		}
	},
	/**
	 * Calculates axis label sizes.
	 */
	calculateSpacing: function(){
		var a = this.axes,
  			options = this.options,
  			series = this.series,
  			margin = options.grid.labelMargin,
  			x = a.x,
  			x2 = a.x2,
  			y = a.y,
  			y2 = a.y2,
  			maxOutset = 2,
  			i, j, l, dim;
		
		// Labels width and height
		[x, x2, y, y2].each(function(axis) {
			var maxLabel = '';
			
		  if (axis.options.showLabels) {
				for(i = 0; i < axis.ticks.length; ++i){
					l = axis.ticks[i].label.length;
					if(l > maxLabel.length){
						maxLabel = axis.ticks[i].label;
					}
				}
	    }
		  axis.maxLabel  = this.getTextDimensions(maxLabel, {size:options.fontSize, angle: Flotr.toRad(axis.options.labelsAngle)}, 'font-size:smaller;', 'flotr-grid-label');
		  axis.titleSize = this.getTextDimensions(axis.options.title, {size: options.fontSize*1.2, angle: Flotr.toRad(axis.options.titleAngle)}, 'font-weight:bold;', 'flotr-axis-title');
		}, this);

    // Title height
    dim = this.getTextDimensions(options.title, {size: options.fontSize*1.5}, 'font-size:1em;font-weight:bold;', 'flotr-title');
    this.titleHeight = dim.height;
    
    // Subtitle height
    dim = this.getTextDimensions(options.subtitle, {size: options.fontSize}, 'font-size:smaller;', 'flotr-subtitle');
    this.subtitleHeight = dim.height;

		// Grid outline line width.
		if(options.show){
			maxOutset = Math.max(maxOutset, options.points.radius + options.points.lineWidth/2);
		}
		for(j = 0; j < options.length; ++j){
			if (series[j].points.show){
				maxOutset = Math.max(maxOutset, series[j].points.radius + series[j].points.lineWidth/2);
			}
		}
		
		var p = this.plotOffset = {left: 0, right: 0, top: 0, bottom: 0};
		p.left = p.right = p.top = p.bottom = maxOutset;
		
		p.bottom += (x.options.showLabels ?  (x.maxLabel.height  + margin) : 0) + 
		            (x.options.title ?       (x.titleSize.height + margin) : 0);
		
    p.top    += (x2.options.showLabels ? (x2.maxLabel.height  + margin) : 0) + 
                (x2.options.title ?      (x2.titleSize.height + margin) : 0) + this.subtitleHeight + this.titleHeight;
    
		p.left   += (y.options.showLabels ?  (y.maxLabel.width  + margin) : 0) + 
                (y.options.title ?       (y.titleSize.width + margin) : 0);
		
		p.right  += (y2.options.showLabels ? (y2.maxLabel.width  + margin) : 0) + 
                (y2.options.title ?      (y2.titleSize.width + margin) : 0);
    
    p.top = Math.floor(p.top); // In order the outline not to be blured
    
		this.plotWidth  = this.canvasWidth - p.left - p.right;
		this.plotHeight = this.canvasHeight - p.bottom - p.top;
		
		x.scale  = this.plotWidth / (x.max - x.min);
		x2.scale = this.plotWidth / (x2.max - x2.min);
		y.scale  = this.plotHeight / (y.max - y.min);
		y2.scale = this.plotHeight / (y2.max - y2.min);
	},
	/**
	 * Draws grid, labels and series.
	 */
	draw: function() {
		this.drawGrid();
		this.drawLabels();
    this.drawTitles();
    
		if(this.series.length){
			this.el.fire('flotr:beforedraw', [this.series, this]);
			for(var i = 0; i < this.series.length; i++){
				if (!this.series[i].hide)
					this.drawSeries(this.series[i]);
			}
		}
		this.el.fire('flotr:afterdraw', [this.series, this]);
	},
	/**
	 * Translates absolute horizontal x coordinates to relative coordinates.
	 * @param {Integer} x - absolute integer x coordinate
	 * @return {Integer} translated relative x coordinate
	 */
	tHoz: function(x, axis){
		axis = axis || this.axes.x;
		return (x - axis.min) * axis.scale;
	},
	/**
	 * Translates absolute vertical x coordinates to relative coordinates.
	 * @param {Integer} y - absolute integer y coordinate
	 * @return {Integer} translated relative y coordinate
	 */
	tVert: function(y, axis){
		axis = axis || this.axes.y;
		return this.plotHeight - (y - axis.min) * axis.scale;
	},
	/**
	 * Draws a grid for the graph.
	 */
	drawGrid: function(){
		var v, o = this.options,
		    ctx = this.ctx;
		if(o.grid.verticalLines || o.grid.horizontalLines){
			this.el.fire('flotr:beforegrid', [this.axes.x, this.axes.y, o, this]);
		}
		ctx.save();
		ctx.translate(this.plotOffset.left, this.plotOffset.top);

		// Draw grid background, if present in options.
		if(o.grid.backgroundColor != null){
			ctx.fillStyle = o.grid.backgroundColor;
			ctx.fillRect(0, 0, this.plotWidth, this.plotHeight);
		}
		
		// Draw grid lines in vertical direction.
		ctx.lineWidth = 1;
		ctx.strokeStyle = o.grid.tickColor;
		ctx.beginPath();
		if(o.grid.verticalLines){
			for(var i = 0; i < this.axes.x.ticks.length; ++i){
				v = this.axes.x.ticks[i].v;
				// Don't show lines on upper and lower bounds.
				if ((v == this.axes.x.min || v == this.axes.x.max) && o.grid.outlineWidth != 0)
					continue;
	
				ctx.moveTo(Math.floor(this.tHoz(v)) + ctx.lineWidth/2, 0);
				ctx.lineTo(Math.floor(this.tHoz(v)) + ctx.lineWidth/2, this.plotHeight);
			}
		}
		
		// Draw grid lines in horizontal direction.
		if(o.grid.horizontalLines){
			for(var j = 0; j < this.axes.y.ticks.length; ++j){
				v = this.axes.y.ticks[j].v;
				// Don't show lines on upper and lower bounds.
				if ((v == this.axes.y.min || v == this.axes.y.max) && o.grid.outlineWidth != 0)
					continue;
	
				ctx.moveTo(0, Math.floor(this.tVert(v)) + ctx.lineWidth/2);
				ctx.lineTo(this.plotWidth, Math.floor(this.tVert(v)) + ctx.lineWidth/2);
			}
		}
		ctx.stroke();
		
		// Draw axis/grid border.
		if(o.grid.outlineWidth != 0) {
			ctx.lineWidth = o.grid.outlineWidth;
			ctx.strokeStyle = o.grid.color;
			ctx.lineJoin = 'round';
			ctx.strokeRect(0, 0, this.plotWidth, this.plotHeight);
		}
		ctx.restore();
		if(o.grid.verticalLines || o.grid.horizontalLines){
			this.el.fire('flotr:aftergrid', [this.axes.x, this.axes.y, o, this]);
		}
	},
	/**
	 * Draws labels for x and y axis.
	 */   
	drawLabels: function(){		
		// Construct fixed width label boxes, which can be styled easily. 
		var noLabels = 0, axis,
			xBoxWidth, i, html, tick,
			options = this.options,
      ctx = this.ctx,
      a = this.axes;
		
		for(i = 0; i < a.x.ticks.length; ++i){
			if (a.x.ticks[i].label) {
				++noLabels;
			}
		}
		xBoxWidth = this.plotWidth / noLabels;
    
		if (!options.HtmlText && this.textEnabled) {
		  var style = {
		    size: options.fontSize,
        adjustAlign: true
		  };

		  // Add x labels.
		  axis = a.x;
		  style.color = axis.options.color || options.grid.color;
		  for(i = 0; i < axis.ticks.length && axis.options.showLabels && axis.used; ++i){
		    tick = axis.ticks[i];
		    if(!tick.label || tick.label.length == 0) continue;
        
        style.angle = Flotr.toRad(axis.options.labelsAngle);
        style.halign = 'c';
        style.valign = 't';
        
		    ctx.drawText(
		      tick.label,
		      this.plotOffset.left + this.tHoz(tick.v, axis), 
		      this.plotOffset.top + this.plotHeight + options.grid.labelMargin,
		      style
		    );
		  }
		  
		  // Add x2 labels.
		  axis = a.x2;
		  style.color = axis.options.color || options.grid.color;
		  for(i = 0; i < axis.ticks.length && axis.options.showLabels && axis.used; ++i){
		    tick = axis.ticks[i];
		    if(!tick.label || tick.label.length == 0) continue;
        
        style.angle = Flotr.toRad(axis.options.labelsAngle);
        style.halign = 'c';
        style.valign = 'b';
        
		    ctx.drawText(
		      tick.label,
		      this.plotOffset.left + this.tHoz(tick.v, axis), 
		      this.plotOffset.top + options.grid.labelMargin,
		      style
		    );
		  }
		  
		  // Add y labels.
		  axis = a.y;
		  style.color = axis.options.color || options.grid.color;
		  for(i = 0; i < axis.ticks.length && axis.options.showLabels && axis.used; ++i){
		    tick = axis.ticks[i];
		    if (!tick.label || tick.label.length == 0) continue;
        
        style.angle = Flotr.toRad(axis.options.labelsAngle);
        style.halign = 'r';
        style.valign = 'm';
        
		    ctx.drawText(
		      tick.label,
		      this.plotOffset.left - options.grid.labelMargin, 
		      this.plotOffset.top + this.tVert(tick.v, axis),
		      style
		    );
		  }
		  
		  // Add y2 labels.
		  axis = a.y2;
		  style.color = axis.options.color || options.grid.color;
		  for(i = 0; i < axis.ticks.length && axis.options.showLabels && axis.used; ++i){
		    tick = axis.ticks[i];
		    if (!tick.label || tick.label.length == 0) continue;
        
        style.angle = Flotr.toRad(axis.options.labelsAngle);
        style.halign = 'l';
        style.valign = 'm';
        
		    ctx.drawText(
		      tick.label,
		      this.plotOffset.left + this.plotWidth + options.grid.labelMargin, 
		      this.plotOffset.top + this.tVert(tick.v, axis),
		      style
		    );
		    
				ctx.save();
				ctx.strokeStyle = style.color;
				ctx.beginPath();
				ctx.moveTo(this.plotOffset.left + this.plotWidth - 8, this.plotOffset.top + this.tVert(tick.v, axis));
				ctx.lineTo(this.plotOffset.left + this.plotWidth,     this.plotOffset.top + this.tVert(tick.v, axis));
				ctx.stroke();
				ctx.restore();
		  }
		} 
		else if (a.x.options.showLabels || 
				     a.x2.options.showLabels || 
				     a.y.options.showLabels || 
				     a.y2.options.showLabels) {
			html = ['<div style="font-size:smaller;color:' + options.grid.color + ';" class="flotr-labels">'];
			
			// Add x labels.
			axis = a.x;
			if (axis.options.showLabels){
				for(i = 0; i < axis.ticks.length; ++i){
					tick = axis.ticks[i];
					if(!tick.label || tick.label.length == 0) continue;
					html.push('<div style="position:absolute;top:' + (this.plotOffset.top + this.plotHeight + options.grid.labelMargin) + 'px;left:' + (this.plotOffset.left + this.tHoz(tick.v, axis) - xBoxWidth/2) + 'px;width:' + xBoxWidth + 'px;text-align:center;'+(axis.options.color?('color:'+axis.options.color+';'):'')+'" class="flotr-grid-label">' + tick.label + '</div>');
				}
			}
			
			// Add x2 labels.
			axis = a.x2;
			if (axis.options.showLabels && axis.used){
				for(i = 0; i < axis.ticks.length; ++i){
					tick = axis.ticks[i];
					if(!tick.label || tick.label.length == 0) continue;
					html.push('<div style="position:absolute;top:' + (this.plotOffset.top - options.grid.labelMargin - axis.maxLabel.height) + 'px;left:' + (this.plotOffset.left + this.tHoz(tick.v, axis) - xBoxWidth/2) + 'px;width:' + xBoxWidth + 'px;text-align:center;'+(axis.options.color?('color:'+axis.options.color+';'):'')+'" class="flotr-grid-label">' + tick.label + '</div>');
				}
			}
			
			// Add y labels.
			axis = a.y;
			if (axis.options.showLabels){
				for(i = 0; i < axis.ticks.length; ++i){
					tick = axis.ticks[i];
					if (!tick.label || tick.label.length == 0) continue;
					html.push('<div style="position:absolute;top:' + (this.plotOffset.top + this.tVert(tick.v, axis) - axis.maxLabel.height/2) + 'px;left:0;width:' + (this.plotOffset.left - options.grid.labelMargin) + 'px;text-align:right;'+(axis.options.color?('color:'+axis.options.color+';'):'')+'" class="flotr-grid-label">' + tick.label + '</div>');
				}
			}
			
			// Add y2 labels.
			axis = a.y2;
			if (axis.options.showLabels && axis.used){
				ctx.save();
				ctx.strokeStyle = axis.options.color || options.grid.color;
				ctx.beginPath();
				
				for(i = 0; i < axis.ticks.length; ++i){
					tick = axis.ticks[i];
					if (!tick.label || tick.label.length == 0) continue;
					html.push('<div style="position:absolute;top:' + (this.plotOffset.top + this.tVert(tick.v, axis) - axis.maxLabel.height/2) + 'px;right:0;width:' + (this.plotOffset.right - options.grid.labelMargin) + 'px;text-align:left;'+(axis.options.color?('color:'+axis.options.color+';'):'')+'" class="flotr-grid-label">' + tick.label + '</div>');

					ctx.moveTo(this.plotOffset.left + this.plotWidth - 8, this.plotOffset.top + this.tVert(tick.v, axis));
					ctx.lineTo(this.plotOffset.left + this.plotWidth,     this.plotOffset.top + this.tVert(tick.v, axis));
				}
				ctx.stroke();
				ctx.restore();
			}
			
			html.push('</div>');
			this.el.insert(html.join(''));
		}
	},
  /**
   * Draws the title and the subtitle
   */   
  drawTitles: function(){
    var html,
        options = this.options,
        margin = options.grid.labelMargin,
        ctx = this.ctx,
        a = this.axes;
      
    if (!options.HtmlText && this.textEnabled) {
      var style = {
        size: options.fontSize,
        color: options.grid.color,
        halign: 'c'
      };

      // Add subtitle
      if (options.subtitle){
        ctx.drawText(
          options.subtitle,
          this.plotOffset.left + this.plotWidth/2, 
          this.titleHeight + this.subtitleHeight - 2,
          style
        );
      }
      
			style.weight = 1.5;
      style.size *= 1.5;
      
      // Add title
      if (options.title){
        ctx.drawText(
          options.title,
          this.plotOffset.left + this.plotWidth/2, 
          this.titleHeight - 2,
          style
        );
      }
      
      style.weight = 1.8;
      style.size *= 0.8;
      style.adjustAlign = true;
      
			// Add x axis title
			if (a.x.options.title && a.x.used){
				style.halign = 'c';
				style.valign = 't';
				style.angle = Flotr.toRad(a.x.options.titleAngle);
        ctx.drawText(
          a.x.options.title,
          this.plotOffset.left + this.plotWidth/2, 
          this.plotOffset.top + a.x.maxLabel.height + this.plotHeight + 2 * margin,
          style
        );
      }
			
			// Add x2 axis title
			if (a.x2.options.title && a.x2.used){
				style.halign = 'c';
				style.valign = 'b';
				style.angle = Flotr.toRad(a.x2.options.titleAngle);
        ctx.drawText(
          a.x2.options.title,
          this.plotOffset.left + this.plotWidth/2, 
          this.plotOffset.top - a.x2.maxLabel.height - 2 * margin,
          style
        );
      }
			
			// Add y axis title
			if (a.y.options.title && a.y.used){
				style.halign = 'r';
				style.valign = 'm';
				style.angle = Flotr.toRad(a.y.options.titleAngle);
        ctx.drawText(
          a.y.options.title,
          this.plotOffset.left - a.y.maxLabel.width - 2 * margin, 
          this.plotOffset.top + this.plotHeight / 2,
          style
        );
      }
			
			// Add y2 axis title
			if (a.y2.options.title && a.y2.used){
				style.halign = 'l';
				style.valign = 'm';
				style.angle = Flotr.toRad(a.y2.options.titleAngle);
        ctx.drawText(
          a.y2.options.title,
          this.plotOffset.left + this.plotWidth + a.y2.maxLabel.width + 2 * margin, 
          this.plotOffset.top + this.plotHeight / 2,
          style
        );
      }
    } 
    else {
      html = ['<div style="color:'+options.grid.color+';" class="flotr-titles">'];
      
      // Add title
      if (options.title){
        html.push('<div style="position:absolute;top:0;left:'+this.plotOffset.left+'px;font-size:1em;font-weight:bold;text-align:center;width:'+this.plotWidth+'px;" class="flotr-title">'+options.title+'</div>');
      }
      
      // Add subtitle
      if (options.subtitle){
        html.push('<div style="position:absolute;top:'+this.titleHeight+'px;left:'+this.plotOffset.left+'px;font-size:smaller;text-align:center;width:'+this.plotWidth+'px;" class="flotr-subtitle">'+options.subtitle+'</div>');
      }
      html.push('</div>');
      
      
      html.push('<div class="flotr-axis-title" style="font-weight:bold;">');
			// Add x axis title
			if (a.x.options.title && a.x.used){
				html.push('<div style="position:absolute;top:' + (this.plotOffset.top + this.plotHeight + options.grid.labelMargin + a.x.titleSize.height) + 'px;left:' + this.plotOffset.left + 'px;width:' + this.plotWidth + 'px;text-align:center;" class="flotr-axis-title">' + a.x.options.title + '</div>');
			}
			
			// Add x2 axis title
			if (a.x2.options.title && a.x2.used){
				html.push('<div style="position:absolute;top:0;left:' + this.plotOffset.left + 'px;width:' + this.plotWidth + 'px;text-align:center;" class="flotr-axis-title">' + a.x2.options.title + '</div>');
			}
			
			// Add y axis title
			if (a.y.options.title && a.y.used){
				html.push('<div style="position:absolute;top:' + (this.plotOffset.top + this.plotHeight/2 - a.y.titleSize.height/2) + 'px;left:0;text-align:right;" class="flotr-axis-title">' + a.y.options.title + '</div>');
			}
			
			// Add y2 axis title
			if (a.y2.options.title && a.y2.used){
				html.push('<div style="position:absolute;top:' + (this.plotOffset.top + this.plotHeight/2 - a.y.titleSize.height/2) + 'px;right:0;text-align:right;" class="flotr-axis-title">' + a.y2.options.title + '</div>');
			}
			html.push('</div>');
      
      this.el.insert(html.join(''));
    }
  },
	/**
	 * Actually draws the graph.
	 * @param {Object} series - series to draw
	 */
	drawSeries: function(series){
		series = series || this.series;
		
		var drawn = false;
		for(var type in Flotr._registeredTypes){
			if(series[type] && series[type].show){
				this[Flotr._registeredTypes[type]](series);
				drawn = true;
			}
		}
		
		if(!drawn){
			this[Flotr._registeredTypes[this.options.defaultType]](series);
		}
	},
	
	plotLine: function(series, offset){
		var ctx = this.ctx,
		    xa = series.xaxis,
		    ya = series.yaxis,
  			tHoz = this.tHoz.bind(this),
  			tVert = this.tVert.bind(this),
  			data = series.data;
			
		if(data.length < 2) return;

		var prevx = tHoz(data[0][0], xa),
		    prevy = tVert(data[0][1], ya) + offset;

		ctx.beginPath();
		ctx.moveTo(prevx, prevy);
		for(var i = 0; i < data.length - 1; ++i){
			var x1 = data[i][0],   y1 = data[i][1],
			    x2 = data[i+1][0], y2 = data[i+1][1];

      // To allow empty values
      if (y1 === null || y2 === null) continue;
      
			/**
			 * Clip with ymin.
			 */
			if(y1 <= y2 && y1 < ya.min){
				/**
				 * Line segment is outside the drawing area.
				 */
				if(y2 < ya.min) continue;
				
				/**
				 * Compute new intersection point.
				 */
				x1 = (ya.min - y1) / (y2 - y1) * (x2 - x1) + x1;
				y1 = ya.min;
			}else if(y2 <= y1 && y2 < ya.min){
				if(y1 < ya.min) continue;
				x2 = (ya.min - y1) / (y2 - y1) * (x2 - x1) + x1;
				y2 = ya.min;
			}

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

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

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

			if(prevx != tHoz(x1, xa) || prevy != tVert(y1, ya) + offset)
				ctx.moveTo(tHoz(x1, xa), tVert(y1, ya) + offset);
			
			prevx = tHoz(x2, xa);
			prevy = tVert(y2, ya) + offset;
			ctx.lineTo(prevx, prevy);
		}
		ctx.stroke();
	},
	/**
	 * Function used to fill
	 * @param {Object} data
	 */
	plotLineArea: function(series, offset){
		var data = series.data;
		if(data.length < 2) return;

		var top, lastX = 0,
			ctx = this.ctx,
	    xa = series.xaxis,
	    ya = series.yaxis,
			tHoz = this.tHoz.bind(this),
			tVert = this.tVert.bind(this),
			bottom = Math.min(Math.max(0, ya.min), ya.max),
			first = true;
		
		ctx.beginPath();
		for(var i = 0; i < data.length - 1; ++i){
			
			var x1 = data[i][0], y1 = data[i][1],
			    x2 = data[i+1][0], y2 = data[i+1][1];
			
			if(x1 <= x2 && x1 < xa.min){
				if(x2 < xa.min) continue;
				y1 = (xa.min - x1) / (x2 - x1) * (y2 - y1) + y1;
				x1 = xa.min;
			}else if(x2 <= x1 && x2 < xa.min){
				if(x1 < xa.min) continue;
				y2 = (xa.min - x1) / (x2 - x1) * (y2 - y1) + y1;
				x2 = xa.min;
			}
								
			if(x1 >= x2 && x1 > xa.max){
				if(x2 > xa.max) continue;
				y1 = (xa.max - x1) / (x2 - x1) * (y2 - y1) + y1;
				x1 = xa.max;
			}else if(x2 >= x1 && x2 > xa.max){
				if (x1 > xa.max) continue;
				y2 = (xa.max - x1) / (x2 - x1) * (y2 - y1) + y1;
				x2 = xa.max;
			}

			if(first){
				ctx.moveTo(tHoz(x1, xa), tVert(bottom, ya) + offset);
				first = false;
			}
			
			/**
			 * Now check the case where both is outside.
			 */
			if(y1 >= ya.max && y2 >= ya.max){
				ctx.lineTo(tHoz(x1, xa), tVert(ya.max, ya) + offset);
				ctx.lineTo(tHoz(x2, xa), tVert(ya.max, ya) + offset);
				continue;
			}else if(y1 <= ya.min && y2 <= ya.min){
				ctx.lineTo(tHoz(x1, xa), tVert(ya.min, ya) + offset);
				ctx.lineTo(tHoz(x2, xa), tVert(ya.min, ya) + offset);
				continue;
			}
			
			/**
			 * Else it's a bit more complicated, there might
			 * be two rectangles and two triangles we need to fill
			 * in; to find these keep track of the current x values.
			 */
			var x1old = x1, x2old = x2;
			
			/**
			 * And clip the y values, without shortcutting.
			 * Clip with ymin.
			 */
			if(y1 <= y2 && y1 < ya.min && y2 >= ya.min){
				x1 = (ya.min - y1) / (y2 - y1) * (x2 - x1) + x1;
				y1 = ya.min;
			}else if(y2 <= y1 && y2 < ya.min && y1 >= ya.min){
				x2 = (ya.min - y1) / (y2 - y1) * (x2 - x1) + x1;
				y2 = ya.min;
			}

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

			/**
			 * If the x value was changed we got a rectangle to fill.
			 */
			if(x1 != x1old){
				top = (y1 <= ya.min) ? top = ya.min : ya.max;
				ctx.lineTo(tHoz(x1old, xa), tVert(top, ya) + offset);
				ctx.lineTo(tHoz(x1, xa), tVert(top, ya) + offset);
			}
		   	
			/**
			 * Fill the triangles.
			 */
			ctx.lineTo(tHoz(x1, xa), tVert(y1, ya) + offset);
			ctx.lineTo(tHoz(x2, xa), tVert(y2, ya) + offset);

			/**
			 * Fill the other rectangle if it's there.
			 */
			if(x2 != x2old){
				top = (y2 <= ya.min) ? ya.min : ya.max;
				ctx.lineTo(tHoz(x2old, xa), tVert(top, ya) + offset);
				ctx.lineTo(tHoz(x2, xa), tVert(top, ya) + offset);
			}

			lastX = Math.max(x2, x2old);
		}
		
		ctx.lineTo(tHoz(lastX, xa), tVert(bottom, ya) + offset);
		ctx.closePath();
		ctx.fill();
	},
	/**
	 * Function: (private) drawSeriesLines
	 * 
	 * Function draws lines series in the canvas element.
	 * 
	 * Parameters:
	 * 		series - Series with options.lines.show = true.
	 * 
	 * Returns:
	 * 		void
	 */
	drawSeriesLines: function(series){
		series = series || this.series;
		var ctx = this.ctx;
		ctx.save();
		ctx.translate(this.plotOffset.left, this.plotOffset.top);
		ctx.lineJoin = 'round';

		var lw = series.lines.lineWidth;
		var sw = series.shadowSize;

		if(sw > 0){
			ctx.lineWidth = sw / 2;

			var offset = lw/2 + ctx.lineWidth/2;
			
			ctx.strokeStyle = "rgba(0,0,0,0.1)";
			this.plotLine(series, offset + sw/2);

			ctx.strokeStyle = "rgba(0,0,0,0.2)";
			this.plotLine(series, offset);

			if(series.lines.fill) {
				ctx.fillStyle = "rgba(0,0,0,0.05)";
				this.plotLineArea(series, offset + sw/2);
			}
		}

		ctx.lineWidth = lw;
		ctx.strokeStyle = series.color;
		if(series.lines.fill){
			ctx.fillStyle = series.lines.fillColor != null ? series.lines.fillColor : Flotr.parseColor(series.color).scale(null, null, null, series.lines.fillOpacity).toString();
			this.plotLineArea(series, 0);
		}

		this.plotLine(series, 0);
		ctx.restore();
	},
	/**
	 * Function: drawSeriesPoints
	 * 
	 * Function draws point series in the canvas element.
	 * 
	 * Parameters:
	 * 		series - Series with options.points.show = true.
	 * 
	 * Returns:
	 * 		void
	 */
	drawSeriesPoints: function(series) {
		var ctx = this.ctx;
		
		ctx.save();
		ctx.translate(this.plotOffset.left, this.plotOffset.top);

		var lw = series.lines.lineWidth;
		var sw = series.shadowSize;
		
		if(sw > 0){
			ctx.lineWidth = sw / 2;
      
			ctx.strokeStyle = 'rgba(0,0,0,0.1)';
			this.plotPointShadows(series, sw/2 + ctx.lineWidth/2, series.points.radius);

			ctx.strokeStyle = 'rgba(0,0,0,0.2)';
			this.plotPointShadows(series, ctx.lineWidth/2, series.points.radius);
		}

		ctx.lineWidth = series.points.lineWidth;
		ctx.strokeStyle = series.color;
		ctx.fillStyle = series.points.fillColor != null ? series.points.fillColor : series.color;
		this.plotPoints(series, series.points.radius, series.points.fill);
		ctx.restore();
	},
	plotPoints: function (series, radius, fill) {
    var xa = series.xaxis,
        ya = series.yaxis,
		    ctx = this.ctx, i,
		    data = series.data;
			
		for(i = data.length - 1; i > -1; --i){
			var x = data[i][0], y = data[i][1];
			if(x < xa.min || x > xa.max || y < ya.min || y > ya.max)
				continue;
			
			ctx.beginPath();
			ctx.arc(this.tHoz(x, xa), this.tVert(y, ya), radius, 0, 2 * Math.PI, true);
			if(fill) ctx.fill();
			ctx.stroke();
		}
	},
	plotPointShadows: function(series, offset, radius){
    var xa = series.xaxis,
        ya = series.yaxis,
		    ctx = this.ctx, i,
		    data = series.data;
			
		for(i = data.length - 1; i > -1; --i){
			var x = data[i][0], y = data[i][1];
			if (x < xa.min || x > xa.max || y < ya.min || y > ya.max)
				continue;
			ctx.beginPath();
			ctx.arc(this.tHoz(x, xa), this.tVert(y, ya) + offset, radius, 0, Math.PI, false);
			ctx.stroke();
		}
	},
	/**
	 * Function: drawSeriesBars
	 * 
	 * Function draws bar series in the canvas element.
	 * 
	 * Parameters:
	 * 		series - Series with options.bars.show = true.
	 * 
	 * Returns:
	 * 		void
	 */
	drawSeriesBars: function(series) {
		var ctx = this.ctx,
			bw = series.bars.barWidth,
			lw = Math.min(series.bars.lineWidth, bw);
		
		ctx.save();
		ctx.translate(this.plotOffset.left, this.plotOffset.top);
		ctx.lineJoin = 'miter';

		/**
		 * @todo linewidth not interpreted the right way.
		 */
		ctx.lineWidth = lw;
		ctx.strokeStyle = series.color;
    
		this.plotBarsShadows(series, bw, 0, series.bars.fill);

		if(series.bars.fill){
			ctx.fillStyle = series.bars.fillColor != null ? series.bars.fillColor : Flotr.parseColor(series.color).scale(null, null, null, series.bars.fillOpacity).toString();
		}
    
		this.plotBars(series, bw, 0, series.bars.fill);
		ctx.restore();
	},
	plotBars: function(series, barWidth, offset, fill){
		var data = series.data;
		if(data.length < 1) return;
		
    var xa = series.xaxis,
        ya = series.yaxis,
  			ctx = this.ctx,
  			tHoz = this.tHoz.bind(this),
  			tVert = this.tVert.bind(this);

		for(var i = 0; i < data.length; i++){
			var x = data[i][0],
			    y = data[i][1];
			var drawLeft = true, drawTop = true, drawRight = true;
			
			// Stacked bars
			var stackOffset = 0;
			if(series.bars.stacked) {
			  xa.values.each(function(o, v) {
			    if (v == x) {
			      stackOffset = o.stack || 0;
			      o.stack = stackOffset + y;
			    }
			  });
			}

			// @todo: fix horizontal bars support
			// Horizontal bars
			if(series.bars.horizontal)
				var left = stackOffset, right = x + stackOffset, bottom = y, top = y + barWidth;
			else 
				var left = x, right = x + barWidth, bottom = stackOffset, top = y + stackOffset;

			if(right < xa.min || left > xa.max || top < ya.min || bottom > ya.max)
				continue;

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

			if(right > xa.max){
				right = xa.max;
				if (xa.lastSerie != series && series.bars.horizontal)
					drawTop = false;
			}

			if(bottom < ya.min)
				bottom = ya.min;

			if(top > ya.max){
				top = ya.max;
				if (ya.lastSerie != series && !series.bars.horizontal)
					drawTop = false;
			}
      
			/**
			 * Fill the bar.
			 */
			if(fill){
				ctx.beginPath();
				ctx.moveTo(tHoz(left, xa), tVert(bottom, ya) + offset);
				ctx.lineTo(tHoz(left, xa), tVert(top, ya) + offset);
				ctx.lineTo(tHoz(right, xa), tVert(top, ya) + offset);
				ctx.lineTo(tHoz(right, xa), tVert(bottom, ya) + offset);
				ctx.fill();
			}

			/**
			 * Draw bar outline/border.
			 */
			if(series.bars.lineWidth != 0 && (drawLeft || drawRight || drawTop)){
				ctx.beginPath();
				ctx.moveTo(tHoz(left, xa), tVert(bottom, ya) + offset);
				
				ctx[drawLeft ?'lineTo':'moveTo'](tHoz(left, xa), tVert(top, ya) + offset);
				ctx[drawTop  ?'lineTo':'moveTo'](tHoz(right, xa), tVert(top, ya) + offset);
				ctx[drawRight?'lineTo':'moveTo'](tHoz(right, xa), tVert(bottom, ya) + offset);
				         
				ctx.stroke();
			}
		}
	},
  plotBarsShadows: function(series, barWidth, offset){
		var data = series.data;
    if(data.length < 1) return;
    
    var xa = series.xaxis,
        ya = series.yaxis,
        ctx = this.ctx,
        tHoz = this.tHoz.bind(this),
        tVert = this.tVert.bind(this),
        sw = this.options.shadowSize;

    for(var i = 0; i < data.length; i++){
      var x = data[i][0],
          y = data[i][1];
      
      // Stacked bars
      var stackOffset = 0;
			if(series.bars.stacked) {
			  xa.values.each(function(o, v) {
			    if (v == x) {
			      stackOffset = o.stackShadow || 0;
			      o.stackShadow = stackOffset + y;
			    }
			  });
			}
      
      // Horizontal bars
      if(series.bars.horizontal) 
        var left = stackOffset, right = x + stackOffset, bottom = y, top = y + barWidth;
      else 
        var left = x, right = x + barWidth, bottom = stackOffset, top = y + stackOffset;

      if(right < xa.min || left > xa.max || top < ya.min || bottom > ya.max)
        continue;

      if(left < xa.min)   left = xa.min;
      if(right > xa.max)  right = xa.max;
      if(bottom < ya.min) bottom = ya.min;
      if(top > ya.max)    top = ya.max;
      
      var width =  tHoz(right, xa)-tHoz(left, xa)-((tHoz(right, xa)+sw <= this.plotWidth) ? 0 : sw);
      var height = Math.max(0, tVert(bottom, ya)-tVert(top, ya)-((tVert(bottom, ya)+sw <= this.plotHeight) ? 0 : sw));

      ctx.fillStyle = 'rgba(0,0,0,0.05)';
      ctx.fillRect(Math.min(tHoz(left, xa)+sw, this.plotWidth), Math.min(tVert(top, ya)+sw, this.plotWidth), width, height);
    }
  },
	/**
	 * Function: drawSeriesCandles
	 * 
	 * Function draws candles series in the canvas element.
	 * 
	 * Parameters:
	 * 		series - Series with options.candles.show = true.
	 * 
	 * Returns:
	 * 		void
	 */
	drawSeriesCandles: function(series) {
		var ctx = this.ctx,
			  bw = series.candles.candleWidth;
		
		ctx.save();
		ctx.translate(this.plotOffset.left, this.plotOffset.top);
		ctx.lineJoin = 'miter';

		/**
		 * @todo linewidth not interpreted the right way.
		 */
		ctx.lineWidth = series.candles.lineWidth;
		this.plotCandlesShadows(series, bw/2);
		this.plotCandles(series, bw/2);
		
		ctx.restore();
	},
	plotCandles: function(series, offset){
		var data = series.data;
		if(data.length < 1) return;
		
    var xa = series.xaxis,
        ya = series.yaxis,
  			ctx = this.ctx,
  			tHoz = this.tHoz.bind(this),
  			tVert = this.tVert.bind(this);

		for(var i = 0; i < data.length; i++){
      var d     = data[i],
  		    x     = d[0],
  		    open  = d[1],
  		    high  = d[2],
  		    low   = d[3],
  		    close = d[4];

			var left    = x,
			    right   = x + series.candles.candleWidth,
          bottom  = Math.max(ya.min, low),
	        top     = Math.min(ya.max, high),
          bottom2 = Math.max(ya.min, Math.min(open, close)),
	        top2    = Math.min(ya.max, Math.max(open, close));

			if(right < xa.min || left > xa.max || top < ya.min || bottom > ya.max)
				continue;

			var color = series.candles[open>close?'downFillColor':'upFillColor'];
			/**
			 * Fill the candle.
			 */
			if(series.candles.fill && !series.candles.barcharts){
				ctx.fillStyle = Flotr.parseColor(color).scale(null, null, null, series.candles.fillOpacity).toString();
				ctx.fillRect(tHoz(left, xa), tVert(top2, ya) + offset, tHoz(right, xa) - tHoz(left, xa), tVert(bottom2, ya) - tVert(top2, ya));
			}

			/**
			 * Draw candle outline/border, high, low.
			 */
			if(series.candles.lineWidth || series.candles.wickLineWidth){
				var x, y, pixelOffset = (series.candles.wickLineWidth % 2) / 2;

				x = Math.floor(tHoz((left + right) / 2), xa) + pixelOffset;
				
			  ctx.save();
			  ctx.strokeStyle = color;
			  ctx.lineWidth = series.candles.wickLineWidth;
			  ctx.lineCap = 'butt';
			  
				if (series.candles.barcharts) {
					ctx.beginPath();
					
					ctx.moveTo(x, Math.floor(tVert(top, ya) + offset));
					ctx.lineTo(x, Math.floor(tVert(bottom, ya) + offset));
					
					y = Math.floor(tVert(open, ya) + offset)+0.5;
					ctx.moveTo(Math.floor(tHoz(left, xa))+pixelOffset, y);
					ctx.lineTo(x, y);
					
					y = Math.floor(tVert(close, ya) + offset)+0.5;
					ctx.moveTo(Math.floor(tHoz(right, xa))+pixelOffset, y);
					ctx.lineTo(x, y);
				} 
				else {
  				ctx.strokeRect(tHoz(left, xa), tVert(top2, ya) + offset, tHoz(right, xa) - tHoz(left, xa), tVert(bottom2, ya) - tVert(top2, ya));

  				ctx.beginPath();
  				ctx.moveTo(x, Math.floor(tVert(top2,    ya) + offset));
  				ctx.lineTo(x, Math.floor(tVert(top,     ya) + offset));
  				ctx.moveTo(x, Math.floor(tVert(bottom2, ya) + offset));
  				ctx.lineTo(x, Math.floor(tVert(bottom,  ya) + offset));
				}
				
				ctx.stroke();
				ctx.restore();
			}
		}
	},
  plotCandlesShadows: function(series, offset){
		var data = series.data;
    if(data.length < 1 || series.candles.barcharts) return;
    
    var xa = series.xaxis,
        ya = series.yaxis,
        tHoz = this.tHoz.bind(this),
        tVert = this.tVert.bind(this),
        sw = this.options.shadowSize;

    for(var i = 0; i < data.length; i++){
      var d     = data[i],
      		x     = d[0],
	        open  = d[1],
	        high  = d[2],
	        low   = d[3],
	        close = d[4];
      
			var left   = x,
	        right  = x + series.candles.candleWidth,
          bottom = Math.max(ya.min, Math.min(open, close)),
	        top    = Math.min(ya.max, Math.max(open, close));

      if(right < xa.min || left > xa.max || top < ya.min || bottom > ya.max)
        continue;

      var width =  tHoz(right, xa)-tHoz(left, xa)-((tHoz(right, xa)+sw <= this.plotWidth) ? 0 : sw);
      var height = Math.max(0, tVert(bottom, ya)-tVert(top, ya)-((tVert(bottom, ya)+sw <= this.plotHeight) ? 0 : sw));

      this.ctx.fillStyle = 'rgba(0,0,0,0.05)';
      this.ctx.fillRect(Math.min(tHoz(left, xa)+sw, this.plotWidth), Math.min(tVert(top, ya)+sw, this.plotWidth), width, height);
    }
  },
  /**
   * Function: drawSeriesPie
   * 
   * Function draws a pie in the canvas element.
   * 
   * Parameters:
   *    series - Series with options.pie.show = true.
   * 
   * Returns:
   *    void
   */
  drawSeriesPie: function(series) {
    if (!this.options.pie.drawn) {
    var ctx = this.ctx,
        options = this.options,
        lw = series.pie.lineWidth,
        sw = series.shadowSize,
        data = series.data,
        radius = (Math.min(this.canvasWidth, this.canvasHeight) * series.pie.sizeRatio) / 2,
        html = [];
    
    var vScale = 1;//Math.cos(series.pie.viewAngle);
    var plotTickness = Math.sin(series.pie.viewAngle)*series.pie.spliceThickness / vScale;
    
    var style = {
      size: options.fontSize*1.2,
      color: options.grid.color,
      weight: 1.5
    };
    
    var center = {
      x: (this.canvasWidth+this.plotOffset.left)/2,
      y: (this.canvasHeight-this.plotOffset.bottom)/2
    };
    
    // Pie portions
    var portions = this.series.collect(function(hash, index){
    	if (hash.pie.show)
      return {
        name: (hash.label || hash.data[0][1]),
        value: [index, hash.data[0][1]],
        explode: hash.pie.explode
      };
    });
    
    // Sum of the portions' angles
    var sum = portions.pluck('value').pluck(1).inject(0, function(acc, n) { return acc + n; });
    
    var fraction = 0.0,
        angle = series.pie.startAngle,
        value = 0.0;
    
    var slices = portions.collect(function(slice){
      angle += fraction;
      value = parseFloat(slice.value[1]); // @warning : won't support null values !!
      fraction = value/sum;
      return {
        name:     slice.name,
        fraction: fraction,
        x:        slice.value[0],
        y:        value,
        explode:  slice.explode,
        startAngle: 2 * angle * Math.PI,
        endAngle:   2 * (angle + fraction) * Math.PI
      };
    });
    
    ctx.save();

    if(sw > 0){
	    slices.each(function (slice) {
        var bisection = (slice.startAngle + slice.endAngle) / 2;
        
        var xOffset = center.x + Math.cos(bisection) * slice.explode + sw;
        var yOffset = center.y + Math.sin(bisection) * slice.explode + sw;
        
		    this.plotSlice(xOffset, yOffset, radius, slice.startAngle, slice.endAngle, false, vScale);

        ctx.fillStyle = 'rgba(0,0,0,0.1)';
        ctx.fill();
      }, this);
    }
    
    if (options.HtmlText) {
      html = ['<div style="color:' + this.options.grid.color + '" class="flotr-labels">'];
    }
    
    slices.each(function (slice, index) {
      var bisection = (slice.startAngle + slice.endAngle) / 2;
      var color = options.colors[index];
      
      var xOffset = center.x + Math.cos(bisection) * slice.explode;
      var yOffset = center.y + Math.sin(bisection) * slice.explode;
      
      this.plotSlice(xOffset, yOffset, radius, slice.startAngle, slice.endAngle, false, vScale);
      
      if(series.pie.fill){
        ctx.fillStyle = Flotr.parseColor(color).scale(null, null, null, series.pie.fillOpacity).toString();
        ctx.fill();
      }
      ctx.lineWidth = lw;
      ctx.strokeStyle = color;
      ctx.stroke();
      
      /*ctx.save();
      ctx.scale(1, vScale);
      
      ctx.moveTo(xOffset, yOffset);
      ctx.beginPath();
      ctx.lineTo(xOffset, yOffset+plotTickness);
      ctx.lineTo(xOffset+Math.cos(slice.startAngle)*radius, yOffset+Math.sin(slice.startAngle)*radius+plotTickness);
      ctx.lineTo(xOffset+Math.cos(slice.startAngle)*radius, yOffset+Math.sin(slice.startAngle)*radius);
      ctx.lineTo(xOffset, yOffset);
      ctx.closePath();
      ctx.fill();ctx.stroke();
      
      ctx.moveTo(xOffset, yOffset);
      ctx.beginPath();
      ctx.lineTo(xOffset, yOffset+plotTickness);
      ctx.lineTo(xOffset+Math.cos(slice.endAngle)*radius, yOffset+Math.sin(slice.endAngle)*radius+plotTickness);
      ctx.lineTo(xOffset+Math.cos(slice.endAngle)*radius, yOffset+Math.sin(slice.endAngle)*radius);
      ctx.lineTo(xOffset, yOffset);
      ctx.closePath();
      ctx.fill();ctx.stroke();
      
      ctx.moveTo(xOffset+Math.cos(slice.startAngle)*radius, yOffset+Math.sin(slice.startAngle)*radius);
      ctx.beginPath();
      ctx.lineTo(xOffset+Math.cos(slice.startAngle)*radius, yOffset+Math.sin(slice.startAngle)*radius+plotTickness);
      ctx.arc(xOffset, yOffset+plotTickness, radius, slice.startAngle, slice.endAngle, false);
      ctx.lineTo(xOffset+Math.cos(slice.endAngle)*radius, yOffset+Math.sin(slice.endAngle)*radius);
      ctx.arc(xOffset, yOffset, radius, slice.endAngle, slice.startAngle, true);
      ctx.closePath();
      ctx.fill();ctx.stroke();
      
      ctx.scale(1, 1/vScale);
      this.plotSlice(xOffset, yOffset+plotTickness, radius, slice.startAngle, slice.endAngle, false, vScale);
      ctx.stroke();
      if(series.pie.fill){
        ctx.fillStyle = Flotr.parseColor(color).scale(null, null, null, series.pie.fillOpacity).toString();
        ctx.fill();
      }
      
      ctx.restore();*/
      
      var label = options.pie.labelFormatter(slice);
      
      var textAlignRight = (Math.cos(bisection) < 0);
      var distX = xOffset + Math.cos(bisection) * (series.pie.explode + radius);
      var distY = yOffset + Math.sin(bisection) * (series.pie.explode + radius);
      
      if (slice.fraction && label) {
        if (options.HtmlText) {
          var divStyle = 'position:absolute;top:' + (distY - 5) + 'px;'; //@todo: change
          if (textAlignRight) {
            divStyle += 'right:'+(this.canvasWidth - distX)+'px;text-align:right;';
          }
          else {
            divStyle += 'left:'+distX+'px;text-align:left;';
          }
          html.push('<div style="' + divStyle + '" class="flotr-grid-label">' + label + '</div>');
        }
        else {
          style.halign = textAlignRight ? 'r' : 'l';
          ctx.drawText(
            label, 
            distX, 
            distY + style.size / 2, 
            style
          );
        }
      }
    }, this);

    if (options.HtmlText) {
      html.push('</div>');    
      this.el.insert(html.join(''));
    }
    
    ctx.restore();
    options.pie.drawn = true;
    }
  },
  plotSlice: function(x, y, radius, startAngle, endAngle, fill, vScale) {
    var ctx = this.ctx;
    vScale = vScale || 1;
    
    ctx.save();
    ctx.scale(1, vScale);
    ctx.beginPath();
    ctx.moveTo(x, y);
    ctx.arc   (x, y, radius, startAngle, endAngle, fill);
    ctx.lineTo(x, y);
    ctx.closePath();
    ctx.restore();
  },
  plotPie: function() {}, 
	/**
	 * Function: insertLegend
	 * 
	 * Function adds a legend div to the canvas container or draws it on the canvas.
	 * 
	 * Parameters:
	 * 		none
	 * 
	 * Returns:
	 * 		void
	 */
	insertLegend: function(){
		if(!this.options.legend.show)
			return;
			
		var series = this.series,
			plotOffset = this.plotOffset,
			options = this.options,
			fragments = [],
			rowStarted = false, 
			ctx = this.ctx,
			i;
			
		var noLegendItems = series.findAll(function(s) {return (s.label && !s.hide)}).size();

    if (noLegendItems) {
	    if (!options.HtmlText && this.textEnabled) {
	      var style = {
	        size: options.fontSize*1.1,
	        color: options.grid.color
	      };
	      
	      // @todo: take css into account
	      //var dummyDiv = this.el.insert('<div class="flotr-legend" style="position:absolute;top:-10000px;"></div>');
	      
	      var p = options.legend.position, 
	          m = options.legend.margin,
	          lbw = options.legend.labelBoxWidth,
	          lbh = options.legend.labelBoxHeight,
	          lbm = options.legend.labelBoxMargin,
	          offsetX = plotOffset.left + m,
	          offsetY = plotOffset.top + m;
	      
	      // We calculate the labels' max width
	      var labelMaxWidth = 0;
	      for(i = series.length - 1; i > -1; --i){
	        if(!series[i].label || series[i].hide) continue;
	        var label = options.legend.labelFormatter(series[i].label);	
	        labelMaxWidth = Math.max(labelMaxWidth, ctx.measureText(label, style));
	      }
	      
	      var legendWidth  = Math.round(lbw + lbm*3 + labelMaxWidth),
	          legendHeight = Math.round(noLegendItems*(lbm+lbh) + lbm);
	
	      if(p.charAt(0) == 's') offsetY = plotOffset.top + this.plotHeight - (m + legendHeight);
	      if(p.charAt(1) == 'e') offsetX = plotOffset.left + this.plotWidth - (m + legendWidth);

	      // Legend box
	      var color = Flotr.parseColor(options.legend.backgroundColor || 'rgb(240,240,240)').scale(null, null, null, options.legend.backgroundOpacity || 0.1).toString();
	      
	      ctx.fillStyle = color;
	      ctx.fillRect(offsetX, offsetY, legendWidth, legendHeight);
	      ctx.strokeStyle = options.legend.labelBoxBorderColor;
	      ctx.strokeRect(Flotr.toPixel(offsetX), Flotr.toPixel(offsetY), legendWidth, legendHeight);
	      
	      // Legend labels
	      var x = offsetX + lbm;
	      var y = offsetY + lbm;
	      for(i = 0; i < series.length; i++){
	        if(!series[i].label || series[i].hide) continue;
	        var label = options.legend.labelFormatter(series[i].label);

	        ctx.fillStyle = series[i].color;
	        ctx.fillRect(x, y, lbw-1, lbh-1);
	        
	        ctx.strokeStyle = options.legend.labelBoxBorderColor;
	        ctx.lineWidth = 1;
	        ctx.strokeRect(Math.ceil(x)-1.5, Math.ceil(y)-1.5, lbw+2, lbh+2);
	        
	        // Legend text
	        ctx.drawText(
	          label,
	          x + lbw + lbm,
	          y + (lbh + style.size - ctx.fontDescent(style))/2,
	          style
	        );
	        
	        y += lbh + lbm;
	      }
	    }
	    else {
	  		for(i = 0; i < series.length; ++i){
	  			if(!series[i].label || series[i].hide) continue;
	  			
	  			if(i % options.legend.noColumns == 0){
	  				fragments.push(rowStarted ? '</tr><tr>' : '<tr>');
	  				rowStarted = true;
	  			}
	  
	  			var label = options.legend.labelFormatter(series[i].label);
	  			
	  			fragments.push('<td class="flotr-legend-color-box"><div style="border:1px solid ' + options.legend.labelBoxBorderColor + ';padding:1px"><div style="width:' + options.legend.labelBoxWidth + 'px;height:' + options.legend.labelBoxHeight + 'px;background-color:' + series[i].color + '"></div></div></td>' +
	  				'<td class="flotr-legend-label">' + label + '</td>');
	  		}
	  		if(rowStarted) fragments.push('</tr>');
	  		
	  		if(fragments.length > 0){
	  			var table = '<table style="font-size:smaller;color:' + options.grid.color + '">' + fragments.join("") + '</table>';
	  			if(options.legend.container != null){
	  				$(options.legend.container).update(table);
	  			}else{
	  				var pos = '';
	  				var p = options.legend.position, m = options.legend.margin;
	  				
	  				     if(p.charAt(0) == 'n') pos += 'top:' + (m + plotOffset.top) + 'px;';
	  				else if(p.charAt(0) == 's') pos += 'bottom:' + (m + plotOffset.bottom) + 'px;';					
	  				     if(p.charAt(1) == 'e') pos += 'right:' + (m + plotOffset.right) + 'px;';
	  				else if(p.charAt(1) == 'w') pos += 'left:' + (m + plotOffset.left) + 'px;';
	  				     
	  				var div = this.el.insert('<div class="flotr-legend" style="position:absolute;z-index:2;' + pos +'">' + table + '</div>').select('div.flotr-legend').first();
	  				
	  				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){
	  						var tmp = (options.grid.backgroundColor != null) ? options.grid.backgroundColor : Flotr.extractColor(div);
	  						c = Flotr.parseColor(tmp).adjust(null, null, null, 1).toString();
	  					}
	  					this.el.insert('<div class="flotr-legend-bg" style="position:absolute;width:' + div.getWidth() + 'px;height:' + div.getHeight() + 'px;' + pos +'background-color:' + c + ';"> </div>').select('div.flotr-legend-bg').first().setStyle({
	  						'opacity': options.legend.backgroundOpacity
	  					});						
	  				}
	  			}
	  		}
	    }
    }
	},
	/**
	 * Function: getEventPosition
	 * 
	 * Calculates the coordinates from a mouse event object.
	 * 
	 * Parameters:
	 * 		event - Mouse Event object.
	 * 
	 * Returns:
	 * 		Object with x and y coordinates of the mouse.
	 */
	getEventPosition: function (event){
		var offset = this.overlay.cumulativeOffset(),
			rx = (event.pageX - offset.left - this.plotOffset.left),
			ry = (event.pageY - offset.top - this.plotOffset.top),
			ax = 0, ay = 0
			
		if(event.pageX == null && event.clientX != null){
			var de = document.documentElement, b = document.body;
			ax = event.clientX + (de && de.scrollLeft || b.scrollLeft || 0);
			ay = event.clientY + (de && de.scrollTop || b.scrollTop || 0);
		}else{
			ax = event.pageX;
			ay = event.pageY;
		}
		
		return {
			x:  this.axes.x.min  + rx / this.axes.x.scale,
			x2: this.axes.x2.min + rx / this.axes.x2.scale,
			y:  this.axes.y.max  - ry / this.axes.y.scale,
			y2: this.axes.y2.max - ry / this.axes.y2.scale,
			relX: rx,
			relY: ry,
			absX: ax,
			absY: ay
		};
	},
	/**
	 * Function: clickHandler
	 * 
	 * Handler observes the 'click' event and fires the 'flotr:click' event.
	 * 
	 * Parameters:
	 * 		event - 'click' Event object.
	 * 
	 * Returns:
	 * 		void
	 */
	clickHandler: function(event){
		if(this.ignoreClick){
			this.ignoreClick = false;
			return;
		}
		this.el.fire('flotr:click', [this.getEventPosition(event), this]);
	},
	/**
	 * Function: mouseMoveHandler
	 * 
	 * Handler observes mouse movement over the graph area. Fires the 
	 * 'flotr:mousemove' event.
	 * 
	 * Parameters:
	 * 		event - 'mousemove' Event object.
	 * 
	 * Returns:
	 * 		void
	 */
	mouseMoveHandler: function(event){
 		var pos = this.getEventPosition(event);
    
		this.lastMousePos.pageX = pos.absX;
		this.lastMousePos.pageY = pos.absY;	
		if(this.selectionInterval == null && (this.options.mouse.track || this.series.any(function(s){return s.mouse && s.mouse.track;}))){	
			this.hit(pos);
		}
    
		this.el.fire('flotr:mousemove', [event, pos, this]);
	},
	/**
	 * Function: mouseDownHandler
	 * 
	 * Handler observes the 'mousedown' event.
	 * 
	 * Parameters:
	 * 		event - 'mousedown' Event object.
	 * 
	 * Returns:
	 * 		void
	 */
	mouseDownHandler: function (event){
    if(event.isRightClick()) {
      event.stop();
      var overlay = this.overlay;
      overlay.hide();
      
      function cancelContextMenu () {
        overlay.show();
        $(document).stopObserving('mousemove', cancelContextMenu);
      }
      $(document).observe('mousemove', cancelContextMenu);
      return;
    }
    
		if(!this.options.selection.mode || !event.isLeftClick()) return;
		
		this.setSelectionPos(this.selection.first, event);				
		if(this.selectionInterval != null){
			clearInterval(this.selectionInterval);
		}
		this.lastMousePos.pageX = null;
		this.selectionInterval = setInterval(this.updateSelection.bind(this), 1000/this.options.selection.fps);
		
		this.mouseUpHandler = this.mouseUpHandler.bind(this);
		$(document).observe('mouseup', this.mouseUpHandler);
	},
	/**
	 * Function: (private) fireSelectEvent
	 * 
	 * Fires the 'flotr:select' event when the user made a selection.
	 * 
	 * Parameters:
	 * 		none
	 * 
	 * Returns:
	 * 		void
	 */
	fireSelectEvent: function(){
		var a = this.axes, selection = this.selection,
			x1 = (selection.first.x <= selection.second.x) ? selection.first.x : selection.second.x,
			x2 = (selection.first.x <= selection.second.x) ? selection.second.x : selection.first.x,
			y1 = (selection.first.y >= selection.second.y) ? selection.first.y : selection.second.y,
			y2 = (selection.first.y >= selection.second.y) ? selection.second.y : selection.first.y;
		
		x1 = a.x.min + x1 / a.x.scale;
		x2 = a.x.min + x2 / a.x.scale;
		y1 = a.y.max - y1 / a.y.scale;
		y2 = a.y.max - y2 / a.y.scale;

		this.el.fire('flotr:select', [{x1:x1, y1:y1, x2:x2, y2:y2}, this]);
	},
	/**
	 * Function: (private) mouseUpHandler
	 * 
	 * Handler observes the mouseup event for the document. 
	 * 
	 * Parameters:
	 * 		event - 'mouseup' Event object.
	 * 
	 * Returns:
	 * 		void
	 */
	mouseUpHandler: function(event){
    $(document).stopObserving('mouseup', this.mouseUpHandler);
    event.stop();
    
		if(this.selectionInterval != null){
			clearInterval(this.selectionInterval);
			this.selectionInterval = null;
		}

		this.setSelectionPos(this.selection.second, event);
		this.clearSelection();
		
		if(this.selectionIsSane()){
			this.drawSelection();
			this.fireSelectEvent();
			this.ignoreClick = true;
		}
	},
	/**
	 * Function: setSelectionPos
	 * 
	 * Calculates the position of the selection.
	 * 
	 * Parameters:
	 * 		pos - Position object.
	 * 		event - Event object.
	 * 
	 * Returns:
	 * 		void
	 */
	setSelectionPos: function(pos, event) {
		var options = this.options,
		    offset = $(this.overlay).cumulativeOffset();
		
		if(options.selection.mode.indexOf('x') == -1){
			pos.x = (pos == this.selection.first) ? 0 : this.plotWidth;			   
		}else{
			pos.x = event.pageX - offset.left - this.plotOffset.left;
			pos.x = Math.min(Math.max(0, pos.x), this.plotWidth);
		}

		if (options.selection.mode.indexOf('y') == -1){
			pos.y = (pos == this.selection.first) ? 0 : this.plotHeight;
		}else{
			pos.y = event.pageY - offset.top - this.plotOffset.top;
			pos.y = Math.min(Math.max(0, pos.y), this.plotHeight);
		}
	},
	/**
	 * Function: updateSelection
	 * 
	 * Updates (draws) the selection box.
	 * 
	 * Parameters:
	 * 		none
	 * 
	 * Returns:
	 * 		void
	 */
	updateSelection: function(){
		if(this.lastMousePos.pageX == null) return;
		
		this.setSelectionPos(this.selection.second, this.lastMousePos);
		this.clearSelection();
		
		if(this.selectionIsSane()) this.drawSelection();
	},
	/**
	 * Function: clearSelection
	 * 
	 * Removes the selection box from the overlay canvas.
	 * 
	 * Parameters:
	 * 		none
	 * 
	 * Returns:
	 * 		void
	 */
	clearSelection: function() {
		if(this.prevSelection == null) return;
			
		var prevSelection = this.prevSelection,
			octx = this.octx,
			plotOffset = this.plotOffset,
			x = Math.min(prevSelection.first.x, prevSelection.second.x),
			y = Math.min(prevSelection.first.y, prevSelection.second.y),
			w = Math.abs(prevSelection.second.x - prevSelection.first.x),
			h = Math.abs(prevSelection.second.y - prevSelection.first.y);
		
		octx.clearRect(x + plotOffset.left - octx.lineWidth,
		               y + plotOffset.top - octx.lineWidth,
		               w + octx.lineWidth*2,
		               h + octx.lineWidth*2);
		
		this.prevSelection = null;
	},
	/**
	 * Function: setSelection
	 * 
	 * Allows the user the manually select an area.
	 * 
	 * Parameters:
	 * 		area - Object with coordinates to select.
	 * 
	 * Returns:
	 * 		void
	 */
	setSelection: function(area){
		var options = this.options,
			xa = this.axes.x,
			ya = this.axes.y,
			vertScale = yaxis.scale,
			hozScale = xaxis.scale,
			selX = options.selection.mode.indexOf('x') != -1,
			selY = options.selection.mode.indexOf('y') != -1;
		
		this.clearSelection();

		this.selection.first.y  = selX ? 0 : (ya.max - area.y1) * vertScale;
		this.selection.second.y = selX ? this.plotHeight : (ya.max - area.y2) * vertScale;			
		this.selection.first.x  = selY ? 0 : (area.x1 - xa.min) * hozScale;
		this.selection.second.x = selY ? this.plotWidth : (area.x2 - xa.min) * hozScale;
		
		this.drawSelection();
		this.fireSelectEvent();
	},
	/**
	 * Function: (private) drawSelection
	 * 
	 * Draws the selection box.
	 * 
	 * Parameters:
	 * 		none
	 * 
	 * Returns:
	 * 		void
	 */
	drawSelection: function() {
		var prevSelection = this.prevSelection,
			selection = this.selection,
			octx = this.octx,
			options = this.options,
			plotOffset = this.plotOffset;
		
		if(prevSelection != null &&
			selection.first.x == prevSelection.first.x &&
			selection.first.y == prevSelection.first.y && 
			selection.second.x == prevSelection.second.x &&
			selection.second.y == prevSelection.second.y)
			return;
		
		octx.strokeStyle = Flotr.parseColor(options.selection.color).scale(null, null, null, 0.8).toString();
		octx.lineWidth = 1;
		octx.lineJoin = 'round';
		octx.fillStyle = Flotr.parseColor(options.selection.color).scale(null, null, null, 0.4).toString();

		this.prevSelection = {
			first: { x: selection.first.x, y: selection.first.y },
			second: { x: selection.second.x, y: selection.second.y }
		};

		var x = Math.min(selection.first.x, selection.second.x),
		    y = Math.min(selection.first.y, selection.second.y),
		    w = Math.abs(selection.second.x - selection.first.x),
		    h = Math.abs(selection.second.y - selection.first.y);
		
		octx.fillRect(x + plotOffset.left, y + plotOffset.top, w, h);
		octx.strokeRect(x + plotOffset.left, y + plotOffset.top, w, h);
	},
	/**
	 * Function: (private) selectionIsSane
	 * 
	 * Determines whether or not the selection is sane and should be drawn.
	 * 
	 * Parameters:
	 * 		none
	 * 
	 * Returns:
	 * 		boolean - True when sane, false otherwise.
	 */
	selectionIsSane: function(){
		var selection = this.selection;
		return Math.abs(selection.second.x - selection.first.x) >= 5 &&
		       Math.abs(selection.second.y - selection.first.y) >= 5;
	},
	/**
	 * Function: clearHit
	 * 
	 * Removes the mouse tracking point from the overlay.
	 * 
	 * Parameters:
	 * 		none
	 * 
	 * Returns:
	 * 		void
	 */
	clearHit: function(){
		if(this.prevHit){
			var options = this.options,
			    plotOffset = this.plotOffset,
			    prevHit = this.prevHit;
					
			this.octx.clearRect(
				this.tHoz(prevHit.x) + plotOffset.left - options.points.radius*2,
				this.tVert(prevHit.y) + plotOffset.top - options.points.radius*2,
				options.points.radius*3 + options.points.lineWidth*3, 
				options.points.radius*3 + options.points.lineWidth*3
			);
			this.prevHit = null;
		}		
	},
	/**
	 * Function: hit
	 * 
	 * Retrieves the nearest data point from the mouse cursor. If it's within
	 * a certain range, draw a point on the overlay canvas and display the x and y
	 * value of the data.
	 * 
	 * Parameters:
	 * 		mouse - Object that holds the relative x and y coordinates of the cursor.
	 * 
	 * Returns:
	 * 		void
	 */
	hit: function(mouse){
		var series = this.series,
			options = this.options,
			prevHit = this.prevHit,
			plotOffset = this.plotOffset,
			octx = this.octx, 
			data, xsens, ysens,
			/**
			 * Nearest data element.
			 */
			i, n = {
				dist:Number.MAX_VALUE,
				x:null,
				y:null,
				relX:mouse.relX,
				relY:mouse.relY,
				absX:mouse.absX,
				absY:mouse.absY,
				mouse:null
			};
		
		for(i = 0; i < series.length; i++){
			s = series[i];
			if(!s.mouse.track) continue;
			data = s.data;
			xsens = (s.xaxis.scale*s.mouse.sensibility);
			ysens = (s.yaxis.scale*s.mouse.sensibility);
			
			for(var j = 0, xpow, ypow; j < data.length; j++){
				if (data[j][1] === null) continue;
                xpow = series[i].mouse.trackMode == 'y' ? 0 : Math.pow(s.xaxis.scale*(data[j][0] - mouse.x), 2);
			    ypow = series[i].mouse.trackMode == 'x' ? 0 : Math.pow(s.yaxis.scale*(data[j][1] - mouse.y), 2);
				if(xpow < xsens && ypow < ysens && Math.sqrt(xpow+ypow) < n.dist){
					n.dist = Math.sqrt(xpow+ypow);
					n.x = data[j][0];
					n.y = data[j][1];
					n.mouse = s.mouse;
				}
			}
		}
		
		if(n.mouse && n.mouse.track && !prevHit || (prevHit && (n.x != prevHit.x || n.y != prevHit.y))){
			var mt = this.mouseTrack || this.el.select(".flotr-mouse-value")[0],
			    pos = '', 
			    p = options.mouse.position, 
			    m = options.mouse.margin,
			    elStyle = 'opacity:0.7;background-color:#000;color:#fff;display:none;position:absolute;padding:2px 8px;-moz-border-radius:4px;border-radius:4px;white-space:nowrap;';

			if (!options.mouse.relative) { // absolute to the canvas
						 if(p.charAt(0) == 'n') pos += 'top:' + (m + plotOffset.top) + 'px;';
				else if(p.charAt(0) == 's') pos += 'bottom:' + (m + plotOffset.bottom) + 'px;';					
				     if(p.charAt(1) == 'e') pos += 'right:' + (m + plotOffset.right) + 'px;';
				else if(p.charAt(1) == 'w') pos += 'left:' + (m + plotOffset.left) + 'px;';
			}
			else { // relative to the mouse
			       if(p.charAt(0) == 'n') pos += 'bottom:' + (m - plotOffset.top - this.tVert(n.y) + this.canvasHeight) + 'px;';
				else if(p.charAt(0) == 's') pos += 'top:' + (m + plotOffset.top + this.tVert(n.y)) + 'px;';
				     if(p.charAt(1) == 'e') pos += 'left:' + (m + plotOffset.left + this.tHoz(n.x)) + 'px;';
				else if(p.charAt(1) == 'w') pos += 'right:' + (m - plotOffset.left - this.tHoz(n.x) + this.canvasWidth) + 'px;';
			}
			
			elStyle += pos;
				     
			if(!mt){
				this.el.insert('<div class="flotr-mouse-value" style="'+elStyle+'"></div>');
				mt = this.mouseTrack = this.el.select('.flotr-mouse-value').first();
			}
			else {
				this.mouseTrack = mt.setStyle(elStyle);
			}
			
			if(n.x !== null && n.y !== null){
				mt.show();
				
				this.clearHit();
				if(n.mouse.lineColor != null){
					octx.save();
					octx.translate(plotOffset.left, plotOffset.top);
					octx.lineWidth = options.points.lineWidth;
					octx.strokeStyle = n.mouse.lineColor;
					octx.fillStyle = '#ffffff';
					octx.beginPath();
					octx.arc(this.tHoz(n.x), this.tVert(n.y), options.mouse.radius, 0, 2 * Math.PI, true);
					octx.fill();
					octx.stroke();
					octx.restore();
				}
				this.prevHit = n;
				
				var decimals = n.mouse.trackDecimals;
				if(decimals == null || decimals < 0) decimals = 0;
				
				mt.innerHTML = n.mouse.trackFormatter({x: n.x.toFixed(decimals), y: n.y.toFixed(decimals)});
				mt.fire('flotr:hit', [n, this]);
			}
			else if(prevHit){
				mt.hide();
				this.clearHit();
			}
		}
	},
	saveImage: function (type, width, height, replaceCanvas) {
		var image = null;
	  switch (type) {
	  	case 'jpeg':
	    case 'jpg': image = Canvas2Image.saveAsJPEG(this.canvas, replaceCanvas, width, height); break;
      default:
      case 'png': image = Canvas2Image.saveAsPNG(this.canvas, replaceCanvas, width, height); break;
      case 'bmp': image = Canvas2Image.saveAsBMP(this.canvas, replaceCanvas, width, height); break;
	  }
	  if (Object.isElement(image) && replaceCanvas) {
	    this.restoreCanvas();
	    this.canvas.hide();
	    this.overlay.hide();
	  	this.el.insert(image.setStyle({position: 'absolute'}));
	  }
	},
	restoreCanvas: function() {
    this.canvas.show();
    this.overlay.show();
    this.el.select('img').invoke('remove');
	}
});

Flotr.Color = Class.create({
	initialize: function(r, g, b, a){
		this.rgba = ['r','g','b','a'];
		var x = 4;
		while(-1<--x){
			this[this.rgba[x]] = arguments[x] || ((x==3) ? 1.0 : 0);
		}
		this.normalize();
	},
	
	adjust: function(rd, gd, bd, ad) {
		var x = 4;
		while(-1<--x){
			if(arguments[x] != null)
				this[this.rgba[x]] += arguments[x];
		}
		return this.normalize();
	},
	
	clone: function(){
		return new Flotr.Color(this.r, this.b, this.g, this.a);
	},
	
	limit: function(val,minVal,maxVal){
		return Math.max(Math.min(val, maxVal), minVal);
	},
	
	normalize: function(){
		var limit = this.limit;
		this.r = limit(parseInt(this.r), 0, 255);
		this.g = limit(parseInt(this.g), 0, 255);
		this.b = limit(parseInt(this.b), 0, 255);
		this.a = limit(this.a, 0, 1);
		return this;
	},
	
	scale: function(rf, gf, bf, af){
		var x = 4;
		while(-1<--x){
			if(arguments[x] != null)
				this[this.rgba[x]] *= arguments[x];
		}
		return this.normalize();
	},
	
	distance: function(color){
		if (!color) return;
		color = new Flotr.parseColor(color);
	  var dist = 0;
		var x = 3;
		while(-1<--x){
			dist += Math.abs(this[this.rgba[x]] - color[this.rgba[x]]);
		}
		return dist;
	},
	
	toString: function(){
		return (this.a >= 1.0) ? 'rgb('+[this.r,this.g,this.b].join(',')+')' : 'rgba('+[this.r,this.g,this.b,this.a].join(',')+')';
	}
});

Flotr.Color.lookupColors = {
	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]
};

// not used yet
Flotr.Date = {
  format: function(d, format) {
		if (!d) return;

    var leftPad = function(n) {
      n = n.toString();
      return n.length == 1 ? "0" + n : n;
    };
    
    var r = [];
    var escape = false;
    
    for (var i = 0; i < format.length; ++i) {
      var c = format.charAt(i);
      
      if (escape) {
        switch (c) {
	        case 'h': c = d.getUTCHours().toString(); break;
	        case 'H': c = leftPad(d.getUTCHours()); break;
	        case 'M': c = leftPad(d.getUTCMinutes()); break;
	        case 'S': c = leftPad(d.getUTCSeconds()); break;
	        case 'd': c = d.getUTCDate().toString(); break;
	        case 'm': c = (d.getUTCMonth() + 1).toString(); break;
	        case 'y': c = d.getUTCFullYear().toString(); break;
	        case 'b': c = Flotr.Date.monthNames[d.getUTCMonth()]; break;
        }
        r.push(c);
        escape = false;
      }
      else {
        if (c == "%")
          escape = true;
        else
          r.push(c);
      }
    }
    return r.join("");
  },
  timeUnits: {
    "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
  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"]
  ],
  monthNames: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
};