// version: 2017-11-25
    /**
    * o--------------------------------------------------------------------------------o
    * | This file is part of the RGraph package - you can learn more at:               |
    * |                                                                                |
    * |                          http://www.rgraph.net                                 |
    * |                                                                                |
    * | RGraph is licensed under the Open Source MIT license. That means that it's     |
    * | totally free to use and there are no restrictions on what you can do with it!  |
    * o--------------------------------------------------------------------------------o
    */
    /**
    * Having this here means that the RGraph libraries can be included in any order, instead of you having
    * to include the common core library first.
    */
    // Define the RGraph global variable
    RGraph = window.RGraph || {isRGraph: true};
    RGraph.Drawing = RGraph.Drawing || {};
    /**
    * The constructor. This function sets up the object. It takes the ID (the HTML attribute) of the canvas as the
    * first argument and the Y coordinate of the axes as the second
    * 
    * @param string id The canvas tag ID
    * @param number y  The Y coordinate
    */
    RGraph.Drawing.XAxis = function (conf)
    {
        /**
        * Allow for object config style
        */
        if (   typeof conf === 'object'
            && typeof conf.y === 'number'
            && typeof conf.id === 'string') {
            var id = conf.id
            var y  = conf.y;
            var parseConfObjectForOptions = true; // Set this so the config is parsed (at the end of the constructor)
         
        } else {
            var id = conf;
            var y  = arguments[1];
        }
        this.id                = id;
        this.canvas            = document.getElementById(this.id);
        this.context           = this.canvas.getContext('2d');
        this.canvas.__object__ = this;
        this.y                 = y;
        this.coords            = [];
        this.coordsText        = [];
        this.original_colors   = [];
        this.firstDraw         = true; // After the first draw this will be false
        /**
        * This defines the type of this shape
        */
        this.type = 'drawing.xaxis';
        /**
        * This facilitates easy object identification, and should always be true
        */
        this.isRGraph = true;
        /**
        * This adds a uid to the object that you can use for identification purposes
        */
        this.uid = RGraph.CreateUID();
        /**
        * This adds a UID to the canvas for identification purposes
        */
        this.canvas.uid = this.canvas.uid ? this.canvas.uid : RGraph.CreateUID();
        /**
        * Some example background properties
        */
        this.properties =
        {
            'chart.gutter.left':     25,
            'chart.gutter.right':    25,
            'chart.labels':          null,
            'chart.labels.position': 'section',
            'chart.colors':          ['black'],
            'chart.title.color':     null, // Defaults to same as chart.colors
            'chart.text.color':      null, // Defaults to same as chart.colors
            'chart.text.font':       'Segoe UI, Arial, Verdana, sans-serif',
            'chart.text.size':       12,
            'chart.text.accessible':        true,
            'chart.text.accessible.overflow':'visible',
            'chart.text.accessible.pointerevents': true,
            'chart.align':           'bottom',
            'chart.numlabels':       5,
            'chart.scale.visible':   true,
            'chart.scale.formatter': null,
            'chart.scale.decimals':  0,
            'chart.scale.point':     '.',
            'chart.scale.thousand':  ',',
            'chart.scale.invert':    false,
            'chart.scale.zerostart': true,
            'chart.units.pre':       '',
            'chart.units.post':      '',
            'chart.title':          '',
            'chart.numticks':        null,
            'chart.hmargin':         0,
            'chart.linewidth':       1,
            'chart.noendtick.left':  false,
            'chart.noendtick.right': false,
            'chart.noxaxis':         false,
            'chart.max':             null,
            'chart.min':             0,
            'chart.tooltips':        null,
            'chart.tooltips.effect':   'fade',
            'chart.tooltips.css.class':'RGraph_tooltip',
            'chart.tooltips.event':    'onclick',
            'chart.events.click':     null,
            'chart.events.mousemove': null,
            'chart.xaxispos':         'bottom',
            'chart.yaxispos':         'left',
            'chart.clearto':   'rgba(0,0,0,0)'
        }
        /**
        * A simple check that the browser has canvas support
        */
        if (!this.canvas) {
            alert('[DRAWING.XAXIS] No canvas support');
            return;
        }
         
        /**
        * Create the dollar object so that functions can be added to them
        */
        this.$0 = {};
        /**
        * Translate half a pixel for antialiasing purposes - but only if it hasn't beeen
        * done already
        */
        if (!this.canvas.__rgraph_aa_translated__) {
            this.context.translate(0.5,0.5);
             
            this.canvas.__rgraph_aa_translated__ = true;
        }
        // Short variable names
        var RG   = RGraph,
            ca   = this.canvas,
            co   = ca.getContext('2d'),
            prop = this.properties,
            pa2  = RG.path2,
            win  = window,
            doc  = document,
            ma   = Math
         
         
         
        /**
        * "Decorate" the object with the generic effects if the effects library has been included
        */
        if (RG.Effects && typeof RG.Effects.decorate === 'function') {
            RG.Effects.decorate(this);
        }
        /**
        * A setter method for setting graph properties. It can be used like this: obj.Set('chart.strokestyle', '#666');
        * 
        * @param name  string The name of the property to set
        * @param value mixed  The value of the property
        */
        this.set =
        this.Set = function (name)
        {
            var value = typeof arguments[1] === 'undefined' ? null : arguments[1];
            /**
            * the number of arguments is only one and it's an
            * object - parse it for configuration data and return.
            */
            if (arguments.length === 1 && typeof name === 'object') {
                RG.parseObjectStyleConfig(this, name);
                return this;
            }
     
            /**
            * This should be done first - prepend the property name with "chart." if necessary
            */
            if (name.substr(0,6) != 'chart.') {
                name = 'chart.' + name;
            }
            // Convert uppercase letters to dot+lower case letter
            while(name.match(/([A-Z])/)) {
                name = name.replace(/([A-Z])/, '.' + RegExp.$1.toLowerCase());
            }
     
            /**
            * Make the tickmarks align if labels are specified
            */
            if (name == 'chart.labels' && !prop['chart.numxticks']) {
                prop['chart.numxticks'] = value.length;
            }
     
            prop[name] = value;
     
            return this;
        };
        /**
        * A getter method for retrieving graph properties. It can be used like this: obj.Get('chart.strokestyle');
        * 
        * @param name  string The name of the property to get
        */
        this.get =
        this.Get = function (name)
        {
            /**
            * This should be done first - prepend the property name with "chart." if necessary
            */
            if (name.substr(0,6) != 'chart.') {
                name = 'chart.' + name;
            }
            // Convert uppercase letters to dot+lower case letter
            while(name.match(/([A-Z])/)) {
                name = name.replace(/([A-Z])/, '.' + RegExp.$1.toLowerCase());
            }
            return prop[name.toLowerCase()];
        };
        /**
        * Draws the rectangle
        */
        this.draw =
        this.Draw = function ()
        {
            /**
            * Fire the onbeforedraw event
            */
            RG.FireCustomEvent(this, 'onbeforedraw');
             
             
             
            /**
            * Stop this growing uncntrollably
            */
            this.coordsText = [];
            /**
            * Some defaults
            */
            this.gutterLeft  = prop['chart.gutter.left'];
            this.gutterRight = prop['chart.gutter.right'];
            if (!prop['chart.text.color'])  prop['chart.text.color']  = prop['chart.colors'][0];
            if (!prop['chart.title.color']) prop['chart.title.color'] = prop['chart.colors'][0];
     
            /**
            * Parse the colors. This allows for simple gradient syntax
            */
            if (!this.colorsParsed) {
     
                this.parseColors();
     
                // Don't want to do this again
                this.colorsParsed = true;
            }
     
     
     
            // DRAW X AXIS HERE
            this.DrawXAxis();
     
     
            /**
            * This installs the event listeners
            */
            RG.InstallEventListeners(this);
     
     
            /**
            * Fire the onfirstdraw event
            */
            if (this.firstDraw) {
                this.firstDraw = false;
                RG.fireCustomEvent(this, 'onfirstdraw');
                this.firstDrawFunc();
            }
            /**
            * Fire the ondraw event
            */
            RG.FireCustomEvent(this, 'ondraw');
             
            return this;
        };
         
         
         
        /**
        * Used in chaining. Runs a function there and then - not waiting for
        * the events to fire (eg the onbeforedraw event)
        * 
        * @param function func The function to execute
        */
        this.exec = function (func)
        {
            func(this);
             
            return this;
        };
        /**
        * The getObjectByXY() worker method
        */
        this.getObjectByXY = function (e)
        {
            if (this.getShape(e)) {
                return this;
            }
        };
        /**
        * Not used by the class during creating the graph, but is used by event handlers
        * to get the coordinates (if any) of the selected shape
        * 
        * @param object e The event object
        */
        this.getShape = function (e)
        {
            var mouseXY = RG.getMouseXY(e);
            var mouseX  = mouseXY[0];
            var mouseY  = mouseXY[1];
     
            if (   mouseX >= this.gutterLeft
                && mouseX <= (ca.width - this.gutterRight)
                && mouseY >= this.y - (prop['chart.align'] ==  'top' ? (prop['chart.text.size'] * 1.5) + 5 : 0)
                && mouseY <= (this.y + (prop['chart.align'] ==  'top' ? 0 : (prop['chart.text.size'] * 1.5) + 5))
               ) {
                 
                var x = this.gutterLeft;
                var y = this.y;
                var w = ca.width - this.gutterLeft - this.gutterRight;
                var h = 15;
     
                return {
                        0: this, 1: x, 2: y, 3: w, 4: h, 5: 0,
                        'object': this, 'x': x, 'y': y, 'width': w, 'height': h, 'index': 0, 'tooltip': prop['chart.tooltips'] ? prop['chart.tooltips'][0] : null
                       };
            }
     
            return null;
        };
        /**
        * This function positions a tooltip when it is displayed
        * 
        * @param obj object    The chart object
        * @param int x         The X coordinate specified for the tooltip
        * @param int y         The Y coordinate specified for the tooltip
        * @param objec tooltip The tooltips DIV element
        *
        this.positionTooltip = function (obj, x, y, tooltip, idx)
        {
            var coordX     = obj.gutterLeft;
            var coordY     = obj.y;
            var coordW     = ca.width - obj.gutterLeft - obj.gutterRight;
            var coordH     = prop['chart.text.size'] * 1.5;
            var canvasXY   = RG.getCanvasXY(ca);
            var mouseXY    = RG.getMouseXY(window.event);
            var width      = tooltip.offsetWidth;
            var height     = tooltip.offsetHeight;
     
            // Set the top position
            tooltip.style.left = 0;
            tooltip.style.top  = window.event.pageY - height - 5 + 'px';
     
            // By default any overflow is hidden
            tooltip.style.overflow = '';
             
            // Reposition the tooltip if at the edges:
             
            // LEFT edge
            if (canvasXY[0] + mouseXY[0] - (width / 2) < 0) {
                tooltip.style.left = canvasXY[0] + mouseXY[0]  - (width * 0.1) + 'px';
     
            // RIGHT edge
            } else if (canvasXY[0] + mouseXY[0]  + (width / 2) > doc.body.offsetWidth) {
                tooltip.style.left = canvasXY[0] + mouseXY[0]  - (width * 0.9) + 'px';
     
            // Default positioning - CENTERED
            } else {
                tooltip.style.left = canvasXY[0] + mouseXY[0]  - (width / 2) + 'px';
            }
        };*/
        /**
        * Each object type has its own Highlight() function which highlights the appropriate shape
        * 
        * @param object shape The shape to highlight
        */
        this.highlight =
        this.Highlight = function (shape)
        {
            if (typeof prop['chart.highlight.style'] === 'function') {
                (prop['chart.highlight.style'])(shape);
            }
        };
        /**
        * This allows for easy specification of gradients
        */
        this.parseColors = function ()
        {
            // Save the original colors so that they can be restored when the canvas is reset
            if (this.original_colors.length === 0) {
                this.original_colors['chart.colors'] = RG.array_clone(prop['chart.colors']);
            }
            /**
            * Parse various properties for colors
            */
            //this.properties['chart.title.color'] = this.parseSingleColorForGradient(this.properties['chart.title.color']);
            //this.properties['chart.text.color']  = this.parseSingleColorForGradient(this.properties['chart.text.color']);
            prop['chart.colors'][0]   = this.parseSingleColorForGradient(prop['chart.colors'][0]);
        };
        /**
        * Use this function to reset the object to the post-constructor state. Eg reset colors if
        * need be etc
        */
        this.reset = function ()
        {
        };
        /**
        * This parses a single color value
        */
        this.parseSingleColorForGradient = function (color)
        {
            if (!color) {
                return color;
            }
     
            if (typeof color === 'string' && color.match(/^gradient\((.*)\)$/i)) {
     
                var parts = RegExp.$1.split(':');
     
                // Create the gradient
                var grad = co.createLinearGradient(prop['chart.gutter.left'],0,ca.width - prop['chart.gutter.right'],0);
     
                var diff = 1 / (parts.length - 1);
     
                grad.addColorStop(0, RG.trim(parts[0]));
     
                for (var j=1,len=parts.length; j<len; ++j) {
                    grad.addColorStop(j * diff, RG.trim(parts[j]));
                }
            }
     
            return grad ? grad : color;
        };
        /**
        * The function that draws the X axis
        */
        this.drawXAxis =
        this.DrawXAxis = function ()
        {
            var gutterLeft      = prop['chart.gutter.left'],
                gutterRight     = prop['chart.gutter.right'],
                x               = this.gutterLeft,
                y               = this.y,
                min             = +prop['chart.min'],
                max             = +prop['chart.max'],
                labels          = prop['chart.labels'],
                labels_position = prop['chart.labels.position'],
                color           = prop['chart.colors'][0],
                title_color     = prop['chart.title.color'],
                label_color     = prop['chart.text.color'],
                width           = ca.width - this.gutterLeft - this.gutterRight,
                font            = prop['chart.text.font'],
                size            = prop['chart.text.size'],
                align           = prop['chart.align'],
                numlabels       = prop['chart.numlabels'],
                formatter       = prop['chart.scale.formatter'],
                decimals        = Number(prop['chart.scale.decimals']),
                invert          = prop['chart.scale.invert'],
                scale_visible   = prop['chart.scale.visible'],
                units_pre       = prop['chart.units.pre'],
                units_post      = prop['chart.units.post'],
                title           = prop['chart.title']
                numticks        = prop['chart.numticks'],
                hmargin         = prop['chart.hmargin'],
                linewidth       = prop['chart.linewidth'],
                noleftendtick   = prop['chart.noendtick.left'],
                norightendtick  = prop['chart.noendtick.right'],
                noxaxis         = prop['chart.noxaxis'],
                xaxispos        = prop['chart.xaxispos'],
                yaxispos        = prop['chart.yaxispos']
     
     
            if (RG.is_null(numticks)) {
                if (labels && labels.length) {
                    numticks = labels.length;
                } else if (!labels && max != 0) {
                    numticks = 10;
                } else {
                    numticks = numlabels;
                }
            }
     
             
     
            /**
            * Set the linewidth
            */
            co.lineWidth = linewidth + 0.001;
     
            /**
            * Set the color
            */
            co.strokeStyle = color;
     
            if (!noxaxis) {
                /**
                * Draw the main horizontal line
                */
                pa2(co, ['b','m',x, ma.round(y),'l',x + width, ma.round(y),'s',co.strokeStyle]);
     
                /**
                * Draw the axis tickmarks
                */
                co.beginPath();
                    for (var i=(noleftendtick ? 1 : 0); i<=(numticks - (norightendtick ? 1 : 0)); ++i) {
                        co.moveTo(ma.round(x + ((width / numticks) * i)), xaxispos == 'center' ? (align == 'bottom' ? y - 3 : y + 3) : y);
                        co.lineTo(ma.round(x + ((width / numticks) * i)), y + (align == 'bottom' ? 3 : -3));
                    }
                co.stroke();
            }
     
     
     
            /**
            * Draw the labels
            */
            co.fillStyle = label_color;
     
            if (labels) {
                /**
                * Draw the labels
                */
                numlabels = labels.length;
                var h = 0;
                var l = 0;
                var single_line = RG.MeasureText('Mg', false, font, size);
     
                // Measure the maximum height
                for (var i=0,len=labels.length; i<len; ++i) {
                    var dimensions = RG.MeasureText(labels[i], false, font, size);
                    var h = ma.max(h, dimensions[1]);
                    var l = ma.max(l, labels[i].split('\r\n').length);
                }
     
     
                for (var i=0,len=labels.length; i<len; ++i) {
                    RG.text2(this,{
                        'font': font,
                        'size': size,
                        'x': labels_position == 'edge' ? ((((width - hmargin - hmargin) / (labels.length - 1)) * i) + gutterLeft + hmargin) : ((((width - hmargin - hmargin) / labels.length) * i) + ((width / labels.length) / 2) + gutterLeft + hmargin),
                        'y':align == 'bottom' ? y + 3 : y - 3 - h + single_line[1],
                        'text':String(labels[i]),
                        'valign': align == 'bottom' ? 'top' : 'bottom',
                        'halign':'center',
                        'tag': 'labels'
                    });
                }
         
     
     
     
     
            /**
            * No specific labels - draw a scale
            */
            } else if (scale_visible){
     
                if (max === null) {
                    alert('[DRAWING.XAXIS] If not specifying axis.labels you must specify axis.max!');
                }
     
                // yaxispos
                if (yaxispos == 'center') {
                    width /= 2;
                    var additionalX = width;            
                } else {
                    var additionalX = 0;
                }
     
                for (var i=0; i<=numlabels; ++i) {
     
                    // Don't show zero if the chart.scale.zerostart option is false
                    if (i == 0 && !prop['chart.scale.zerostart']) {
                        continue;
                    }
     
                    var original = (((max - min) / numlabels) * i) + min;
                    var hmargin  = prop['chart.hmargin'];
     
                    var text = String(typeof(formatter) == 'function' ? formatter(this, original) : RG.numberFormat(this, original.toFixed(original === 0 ? 0 : decimals), units_pre, units_post));
     
                    if (invert) {
                        var x = ((width - hmargin - ((width - hmargin - hmargin) / numlabels) * i)) + gutterLeft + additionalX;
                    } else {
                        var x = (((width - hmargin - hmargin) / numlabels) * i) + gutterLeft + hmargin + additionalX;
                    }
     
                    RG.Text2(this,{
                        'font': font,
                        'size': size,
                        'x': x,
                        'y': align == 'bottom' ? y + 3 : y - 3,
                        'text':text,
                        'valign':align == 'bottom' ? 'top' : 'bottom',
                        'halign':'center',
                        'tag': 'scale'
                    });
                }
     
                /**
                * If the Y axis is in the center - this draws the left half of the labels
                */
                if (yaxispos == 'center') {
                  for (var i=0; i<numlabels; ++i) {
         
                        var original = (((max - min) / numlabels) * (numlabels - i)) + min;
                        var hmargin  = prop['chart.hmargin'];
         
                        var text = String(typeof(formatter) == 'function' ? formatter(this, original) : RG.number_format(this, original.toFixed(decimals), units_pre, units_post));
         
                        if (invert) {
                            var x = ((width - hmargin - ((width - hmargin - hmargin) / numlabels) * i)) + gutterLeft;
                        } else {
                            var x = (((width - hmargin - hmargin) / numlabels) * i) + gutterLeft + hmargin;
                        }
         
                        RG.text2(this, {
                            'font':font,
                            'size':size,
                            'x':x,
                            'y':align == 'bottom' ? y + size + 2 : y - size - 2,'text':'-' + text,
                            'valign':'center',
                            'halign':'center',
                            'tag': 'scale'
                        });
                    }
                }
            }
     
     
     
            /**
            * Draw the title for the axes
            */
            if (title) {
     
                var dimensions = RG.MeasureText(title, false, font, size + 2);
     
                co.fillStyle = title_color
                    RG.Text2(this,{'font': font,
                                       'size': size + 2,
                                       'x': (ca.width - this.gutterLeft - this.gutterRight) / 2 + this.gutterLeft,
                                       'y': align == 'bottom' ? y + dimensions[1] + 10 : y - dimensions[1] - 10,
                                       'text': title,
                                       'valign': 'center',
                                       'halign':'center',
                                       'tag': 'title'
                                       });
            }
        };
        /**
        * Using a function to add events makes it easier to facilitate method chaining
        * 
        * @param string   type The type of even to add
        * @param function func 
        */
        this.on = function (type, func)
        {
            if (type.substr(0,2) !== 'on') {
                type = 'on' + type;
            }
             
            if (typeof this[type] !== 'function') {
                this[type] = func;
            } else {
                RG.addCustomEventListener(this, type, func);
            }
     
            return this;
        };
        /**
        * This function runs once only
        * (put at the end of the file (before any effects))
        */
        this.firstDrawFunc = function ()
        {
        };
        RG.att(ca);
        /**
        * Objects are now always registered so that the chart is redrawn if need be.
        */
        RG.Register(this);
        /**
        * This is the 'end' of the constructor so if the first argument
        * contains configuration data - handle that.
        */
        if (parseConfObjectForOptions) {
            RG.parseObjectStyleConfig(this, conf.options);
        }
    };