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815 lines
26 KiB
JavaScript
815 lines
26 KiB
JavaScript
// version: 2015-11-02
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/**
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* o--------------------------------------------------------------------------------o
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* | This file is part of the RGraph package - you can learn more at: |
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* | |
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* | http://www.rgraph.net |
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* | |
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* | RGraph is dual licensed under the Open Source GPL (General Public License) |
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* | v2.0 license and a commercial license which means that you're not bound by |
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* | the terms of the GPL. The commercial license is just £99 (GBP) and you can |
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* | read about it here: |
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* | http://www.rgraph.net/license |
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* o--------------------------------------------------------------------------------o
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*/
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/**
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* Having this here means that the RGraph libraries can be included in any order, instead of you having
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* to include the common core library first.
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*/
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// Define the RGraph global variable
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RGraph = window.RGraph || {isRGraph: true};
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RGraph.Drawing = RGraph.Drawing || {};
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/**
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* The constructor. This function sets up the object. It takes the ID (the HTML attribute) of the canvas as the
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* first argument and the Y coordinate of the axes as the second
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*
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* @param string id The canvas tag ID
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* @param number y The Y coordinate
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*/
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RGraph.Drawing.XAxis = function (conf)
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{
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/**
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* Allow for object config style
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*/
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if ( typeof conf === 'object'
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&& typeof conf.y === 'number'
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&& typeof conf.id === 'string') {
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var id = conf.id
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var y = conf.y;
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var parseConfObjectForOptions = true; // Set this so the config is parsed (at the end of the constructor)
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} else {
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var id = conf;
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var y = arguments[1];
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}
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this.id = id;
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this.canvas = document.getElementById(this.id);
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this.context = this.canvas.getContext('2d');
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this.canvas.__object__ = this;
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this.y = y;
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this.coords = [];
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this.coordsText = [];
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this.original_colors = [];
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this.firstDraw = true; // After the first draw this will be false
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/**
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* This defines the type of this shape
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*/
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this.type = 'drawing.xaxis';
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/**
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* This facilitates easy object identification, and should always be true
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*/
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this.isRGraph = true;
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/**
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* This adds a uid to the object that you can use for identification purposes
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*/
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this.uid = RGraph.CreateUID();
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/**
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* This adds a UID to the canvas for identification purposes
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*/
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this.canvas.uid = this.canvas.uid ? this.canvas.uid : RGraph.CreateUID();
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/**
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* Some example background properties
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*/
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this.properties =
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{
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'chart.gutter.left': 25,
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'chart.gutter.right': 25,
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'chart.labels': null,
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'chart.labels.position': 'section',
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'chart.colors': ['black'],
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'chart.title.color': null, // Defaults to same as chart.colors
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'chart.text.color': null, // Defaults to same as chart.colors
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'chart.text.font': 'Arial',
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'chart.text.size': 12,
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'chart.align': 'bottom',
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'chart.numlabels': 5,
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'chart.scale.visible': true,
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'chart.scale.formatter': null,
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'chart.scale.decimals': 0,
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'chart.scale.point': '.',
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'chart.scale.thousand': ',',
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'chart.scale.invert': false,
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'chart.scale.zerostart': true,
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'chart.units.pre': '',
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'chart.units.post': '',
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'chart.title': '',
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'chart.numticks': null,
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'chart.hmargin': 0,
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'chart.linewidth': 1,
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'chart.noendtick.left': false,
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'chart.noendtick.right': false,
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'chart.noxaxis': false,
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'chart.max': null,
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'chart.min': 0,
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'chart.tooltips': null,
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'chart.tooltips.effect': 'fade',
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'chart.tooltips.css.class':'RGraph_tooltip',
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'chart.tooltips.event': 'onclick',
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'chart.events.click': null,
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'chart.events.mousemove': null,
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'chart.xaxispos': 'bottom',
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'chart.yaxispos': 'left'
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}
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/**
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* A simple check that the browser has canvas support
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*/
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if (!this.canvas) {
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alert('[DRAWING.XAXIS] No canvas support');
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return;
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}
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/**
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* Create the dollar object so that functions can be added to them
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*/
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this.$0 = {};
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/**
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* Translate half a pixel for antialiasing purposes - but only if it hasn't beeen
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* done already
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*/
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if (!this.canvas.__rgraph_aa_translated__) {
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this.context.translate(0.5,0.5);
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this.canvas.__rgraph_aa_translated__ = true;
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}
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// Short variable names
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var RG = RGraph,
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ca = this.canvas,
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co = ca.getContext('2d'),
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prop = this.properties,
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pa = RG.Path,
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pa2 = RG.path2,
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win = window,
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doc = document,
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ma = Math
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/**
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* "Decorate" the object with the generic effects if the effects library has been included
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*/
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if (RG.Effects && typeof RG.Effects.decorate === 'function') {
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RG.Effects.decorate(this);
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}
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/**
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* A setter method for setting graph properties. It can be used like this: obj.Set('chart.strokestyle', '#666');
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*
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* @param name string The name of the property to set
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* @param value mixed The value of the property
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*/
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this.set =
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this.Set = function (name)
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{
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var value = typeof arguments[1] === 'undefined' ? null : arguments[1];
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/**
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* the number of arguments is only one and it's an
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* object - parse it for configuration data and return.
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*/
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if (arguments.length === 1 && typeof name === 'object') {
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RG.parseObjectStyleConfig(this, name);
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return this;
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}
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/**
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* This should be done first - prepend the property name with "chart." if necessary
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*/
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if (name.substr(0,6) != 'chart.') {
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name = 'chart.' + name;
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}
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// Convert uppercase letters to dot+lower case letter
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name = name.replace(/([A-Z])/g, function (str)
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{
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return '.' + String(RegExp.$1).toLowerCase();
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});
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/**
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* Make the tickmarks align if labels are specified
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*/
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if (name == 'chart.labels' && !prop['chart.numxticks']) {
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prop['chart.numxticks'] = value.length;
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}
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prop[name] = value;
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return this;
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};
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/**
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* A getter method for retrieving graph properties. It can be used like this: obj.Get('chart.strokestyle');
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*
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* @param name string The name of the property to get
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*/
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this.get =
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this.Get = function (name)
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{
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/**
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* This should be done first - prepend the property name with "chart." if necessary
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*/
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if (name.substr(0,6) != 'chart.') {
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name = 'chart.' + name;
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}
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// Convert uppercase letters to dot+lower case letter
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name = name.replace(/([A-Z])/g, function (str)
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{
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return '.' + String(RegExp.$1).toLowerCase()
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});
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return prop[name.toLowerCase()];
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};
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/**
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* Draws the rectangle
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*/
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this.draw =
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this.Draw = function ()
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{
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/**
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* Fire the onbeforedraw event
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*/
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RG.FireCustomEvent(this, 'onbeforedraw');
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/**
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* Stop this growing uncntrollably
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*/
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this.coordsText = [];
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/**
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* Some defaults
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*/
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this.gutterLeft = prop['chart.gutter.left'];
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this.gutterRight = prop['chart.gutter.right'];
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if (!prop['chart.text.color']) prop['chart.text.color'] = prop['chart.colors'][0];
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if (!prop['chart.title.color']) prop['chart.title.color'] = prop['chart.colors'][0];
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/**
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* Parse the colors. This allows for simple gradient syntax
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*/
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if (!this.colorsParsed) {
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this.parseColors();
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// Don't want to do this again
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this.colorsParsed = true;
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}
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// DRAW X AXIS HERE
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this.DrawXAxis();
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/**
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* This installs the event listeners
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*/
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RG.InstallEventListeners(this);
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/**
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* Fire the onfirstdraw event
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*/
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if (this.firstDraw) {
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RG.fireCustomEvent(this, 'onfirstdraw');
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this.firstDraw = false;
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this.firstDrawFunc();
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}
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/**
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* Fire the ondraw event
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*/
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RG.FireCustomEvent(this, 'ondraw');
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return this;
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};
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/**
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* Used in chaining. Runs a function there and then - not waiting for
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* the events to fire (eg the onbeforedraw event)
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*
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* @param function func The function to execute
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*/
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this.exec = function (func)
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{
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func(this);
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return this;
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};
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/**
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* The getObjectByXY() worker method
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*/
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this.getObjectByXY = function (e)
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{
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if (this.getShape(e)) {
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return this;
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}
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};
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/**
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* Not used by the class during creating the graph, but is used by event handlers
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* to get the coordinates (if any) of the selected shape
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*
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* @param object e The event object
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*/
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this.getShape = function (e)
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{
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var mouseXY = RG.getMouseXY(e);
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var mouseX = mouseXY[0];
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var mouseY = mouseXY[1];
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if ( mouseX >= this.gutterLeft
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&& mouseX <= (ca.width - this.gutterRight)
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&& mouseY >= this.y - (prop['chart.align'] == 'top' ? (prop['chart.text.size'] * 1.5) + 5 : 0)
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&& mouseY <= (this.y + (prop['chart.align'] == 'top' ? 0 : (prop['chart.text.size'] * 1.5) + 5))
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) {
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var x = this.gutterLeft;
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var y = this.y;
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var w = ca.width - this.gutterLeft - this.gutterRight;
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var h = 15;
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return {
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0: this, 1: x, 2: y, 3: w, 4: h, 5: 0,
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'object': this, 'x': x, 'y': y, 'width': w, 'height': h, 'index': 0, 'tooltip': prop['chart.tooltips'] ? prop['chart.tooltips'][0] : null
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};
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}
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return null;
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};
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/**
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* This function positions a tooltip when it is displayed
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*
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* @param obj object The chart object
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* @param int x The X coordinate specified for the tooltip
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* @param int y The Y coordinate specified for the tooltip
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* @param objec tooltip The tooltips DIV element
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*/
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this.positionTooltip = function (obj, x, y, tooltip, idx)
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{
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var coordX = obj.gutterLeft;
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var coordY = obj.y;
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var coordW = ca.width - obj.gutterLeft - obj.gutterRight;
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var coordH = prop['chart.text.size'] * 1.5;
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var canvasXY = RG.getCanvasXY(ca);
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var width = tooltip.offsetWidth;
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var height = tooltip.offsetHeight;
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// Set the top position
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tooltip.style.left = 0;
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tooltip.style.top = canvasXY[1] + this.y - height - 5 + (prop['chart.align'] == 'top' ? ((prop['chart.text.size'] * 1.5) / 2) * -1 : ((prop['chart.text.size'] * 1.5) / 2)) + 'px';
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// By default any overflow is hidden
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tooltip.style.overflow = '';
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// The arrow
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var img = new Image();
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img.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABEAAAAFCAYAAACjKgd3AAAARUlEQVQYV2NkQAN79+797+RkhC4M5+/bd47B2dmZEVkBCgcmgcsgbAaA9GA1BCSBbhAuA/AagmwQPgMIGgIzCD0M0AMMAEFVIAa6UQgcAAAAAElFTkSuQmCC';
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img.style.position = 'absolute';
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img.id = '__rgraph_tooltip_pointer__';
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img.style.top = (tooltip.offsetHeight - 2) + 'px';
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tooltip.appendChild(img);
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// Reposition the tooltip if at the edges:
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// LEFT edge
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if ((canvasXY[0] + coordX + (coordW / 2) - (width / 2)) < 10) {
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tooltip.style.left = (canvasXY[0] + coordX - (width * 0.1)) + (coordW / 2) + 'px';
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img.style.left = ((width * 0.1) - 8.5) + 'px';
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// RIGHT edge
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} else if ((canvasXY[0] + coordX + (coordW / 2) + (width / 2)) > (doc.body.offsetWidth - 10) ) {
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tooltip.style.left = canvasXY[0] + coordX - (width * 0.9) + (coordW / 2) + 'px';
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img.style.left = ((width * 0.9) - 8.5) + 'px';
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// Default positioning - CENTERED
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} else {
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tooltip.style.left = (canvasXY[0] + coordX + (coordW / 2) - (width * 0.5)) + 'px';
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img.style.left = ((width * 0.5) - 8.5) + 'px';
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}
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};
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/**
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* Each object type has its own Highlight() function which highlights the appropriate shape
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*
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* @param object shape The shape to highlight
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*/
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this.highlight =
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this.Highlight = function (shape)
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{
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// When showing tooltips, this method can be used to highlight the X axis
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};
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/**
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* This allows for easy specification of gradients
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*/
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this.parseColors = function ()
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{
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// Save the original colors so that they can be restored when the canvas is reset
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if (this.original_colors.length === 0) {
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this.original_colors['chart.colors'] = RG.array_clone(prop['chart.colors']);
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}
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/**
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* Parse various properties for colors
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*/
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//this.properties['chart.title.color'] = this.parseSingleColorForGradient(this.properties['chart.title.color']);
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//this.properties['chart.text.color'] = this.parseSingleColorForGradient(this.properties['chart.text.color']);
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prop['chart.colors'][0] = this.parseSingleColorForGradient(prop['chart.colors'][0]);
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};
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/**
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* Use this function to reset the object to the post-constructor state. Eg reset colors if
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* need be etc
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*/
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this.reset = function ()
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{
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};
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/**
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* This parses a single color value
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*/
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this.parseSingleColorForGradient = function (color)
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{
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if (!color) {
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return color;
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}
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if (typeof color === 'string' && color.match(/^gradient\((.*)\)$/i)) {
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var parts = RegExp.$1.split(':');
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// Create the gradient
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var grad = co.createLinearGradient(prop['chart.gutter.left'],0,ca.width - prop['chart.gutter.right'],0);
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var diff = 1 / (parts.length - 1);
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grad.addColorStop(0, RG.trim(parts[0]));
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for (var j=1,len=parts.length; j<len; ++j) {
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grad.addColorStop(j * diff, RG.trim(parts[j]));
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}
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}
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return grad ? grad : color;
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};
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/**
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* The function that draws the X axis
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*/
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this.drawXAxis =
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this.DrawXAxis = function ()
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{
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var gutterLeft = prop['chart.gutter.left'],
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gutterRight = prop['chart.gutter.right'],
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x = this.gutterLeft,
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y = this.y,
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min = +prop['chart.min'],
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max = +prop['chart.max'],
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labels = prop['chart.labels'],
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labels_position = prop['chart.labels.position'],
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color = prop['chart.colors'][0],
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title_color = prop['chart.title.color'],
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label_color = prop['chart.text.color'],
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width = ca.width - this.gutterLeft - this.gutterRight,
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font = prop['chart.text.font'],
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size = prop['chart.text.size'],
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align = prop['chart.align'],
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numlabels = prop['chart.numlabels'],
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formatter = prop['chart.scale.formatter'],
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decimals = Number(prop['chart.scale.decimals']),
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invert = prop['chart.scale.invert'],
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scale_visible = prop['chart.scale.visible'],
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units_pre = prop['chart.units.pre'],
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units_post = prop['chart.units.post'],
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title = prop['chart.title']
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numticks = prop['chart.numticks'],
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hmargin = prop['chart.hmargin'],
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linewidth = prop['chart.linewidth'],
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noleftendtick = prop['chart.noendtick.left'],
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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
|
|
*/
|
|
pa(co, ['b','m',x, Math.round(y),'l',x + width, Math.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(Math.round(x + ((width / numticks) * i)), xaxispos == 'center' ? (align == 'bottom' ? y - 3 : y + 3) : y);
|
|
co.lineTo(Math.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 = Math.max(h, dimensions[1]);
|
|
var l = Math.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.number_format(this, original.toFixed(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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}; |