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860 lines
30 KiB
JavaScript
860 lines
30 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 X coordinate of the axis as the second
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*
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* @param string id The canvas tag ID
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* @param number x The X coordinate of the Y axis
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*/
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RGraph.Drawing.YAxis = 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.x === 'number'
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&& typeof conf.id === 'string') {
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var id = conf.id
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var x = conf.x;
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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 x = 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.x = x;
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this.coords = [];
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this.coordsText = [];
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this.original_colors = [];
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this.maxLabelLength = 0;
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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.yaxis';
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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.top': 25,
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'chart.gutter.bottom': 30,
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'chart.min': 0,
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'chart.max': null,
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'chart.colors': ['black'],
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'chart.title': '',
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'chart.title.color': null,
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'chart.text.color': null,
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'chart.numticks': 5,
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'chart.numlabels': 5,
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'chart.labels.specific': null,
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'chart.text.font': 'Arial',
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'chart.text.size': 12,
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'chart.align': 'left',
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'hart.scale.formatter': null,
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'chart.scale.point': '.',
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'chart.scale.decimals': 0,
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'chart.scale.decimals': 0,
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'chart.scale.point': '.',
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'chart.scale.invert': false,
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'chart.scale.zerostart': true,
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'chart.scale.visible': true,
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'chart.units.pre': '',
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'chart.units.post': '',
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'chart.linewidth': 1,
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'chart.noendtick.top': false,
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'chart.noendtick.bottom': false,
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'chart.noyaxis': false,
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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.xaxispos': 'bottom',
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'chart.events.click': null,
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'chart.events.mousemove': null
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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.YAXIS] 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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* ** Could use setTransform() here instead ?
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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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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 axes
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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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* Some defaults
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*/
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this.gutterTop = prop['chart.gutter.top'];
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this.gutterBottom = prop['chart.gutter.bottom'];
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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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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 Y AXIS HERE
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this.drawYAxis();
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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 axis, 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.x - (prop['chart.align'] == 'right' ? 0 : this.getWidth())
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&& mouseX <= this.x + (prop['chart.align'] == 'right' ? this.getWidth() : 0)
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&& mouseY >= this.gutterTop
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&& mouseY <= (ca.height - this.gutterBottom)
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) {
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var x = this.x;
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var y = this.gutterTop;
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var w = 15;;
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var h = ca.height - this.gutterTop - this.gutterBottom;
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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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// If there's multiple charts on the canvas they leave unknown font settings
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co.font = prop['chart.text.size'] + ' ' + prop['chart.text.font'];
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var coordW = co.measureText(prop['chart.max'].toFixed(prop['chart.scale.decimals'])).width;
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var coordX = obj.x - coordW;
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var coordY = obj.gutterTop;
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var coordH = ca.height - obj.gutterTop - obj.gutterBottom;
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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] + ((ca.height - this.gutterTop - this.gutterBottom) / 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 = prop['chart.align'] == 'right' ? canvasXY[0] + obj.x - (width * 0.1) + (coordW / 2) + 'px'
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: (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 + (width / 2)) > document.body.offsetWidth) {
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tooltip.style.left = prop['chart.align'] == 'right' ? canvasXY[0] + obj.x - (width * 0.9) + (coordW / 2) + 'px'
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: 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 = prop['chart.align'] == 'right' ? canvasXY[0] + obj.x - (width / 2) + (coordW / 2) + 'px'
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: canvasXY[0] + obj.x - (width / 2) - (coordW / 2) + '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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//prop['chart.title.color'] = this.parseSingleColorForGradient(prop['chart.title.color']);
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//prop['chart.text.color'] = this.parseSingleColorForGradient(prop['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(0,prop['chart.gutter.top'],0,ca.height - this.gutterBottom);
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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; j<parts.length; ++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 Y axis
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*/
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this.drawYAxis =
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this.DrawYAxis = function ()
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{
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// Allow both axis.xxx and chart.xxx to prevent any confusion that may arise
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for (i in prop) {
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if (typeof(i) == 'string') {
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var key = i.replace(/^chart\./, 'axis.');
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prop[key] = prop[i];
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}
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}
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var x = this.x,
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y = this.gutterTop,
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height = ca.height - this.gutterBottom - this.gutterTop,
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min = +prop['chart.min'] ? +prop['chart.min'] : 0,
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max = +prop['chart.max'],
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title = prop['chart.title'] ? prop['chart.title'] : '',
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color = prop['chart.colors'] ? prop['chart.colors'][0] : 'black',
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title_color = prop['chart.title.color'] ? prop['chart.title.color'] : color,
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label_color = prop['chart.text.color'] ? prop['chart.text.color'] : color,
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numticks = typeof(prop['chart.numticks']) == 'number' ? prop['chart.numticks'] : 10,
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labels_specific = prop['chart.labels.specific'],
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numlabels = prop['chart.numlabels'] ? prop['chart.numlabels'] : 5,
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font = prop['chart.text.font'] ? prop['chart.text.font'] : 'Arial',
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size = prop['chart.text.size'] ? prop['chart.text.size'] : 10
|
|
align = typeof(prop['chart.align']) == 'string'? prop['chart.align'] : 'left',
|
|
formatter = prop['chart.scale.formatter'],
|
|
decimals = 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'],
|
|
linewidth = prop['chart.linewidth'] ? prop['chart.linewidth'] : 1,
|
|
notopendtick = prop['chart.noendtick.top'],
|
|
nobottomendtick = prop['chart.noendtick.bottom'],
|
|
noyaxis = prop['chart.noyaxis'],
|
|
xaxispos = prop['chart.xaxispos']
|
|
|
|
|
|
// This fixes missing corner pixels in Chrome
|
|
co.lineWidth = linewidth + 0.001;
|
|
|
|
|
|
/**
|
|
* Set the color
|
|
*/
|
|
co.strokeStyle = color;
|
|
|
|
if (!noyaxis) {
|
|
/**
|
|
* Draw the main vertical line
|
|
*/
|
|
pa(co,['b','m',Math.round(x), y,'l',Math.round(x), y + height,'s',color]);
|
|
|
|
/**
|
|
* Draw the axes tickmarks
|
|
*/
|
|
if (numticks) {
|
|
|
|
var gap = (xaxispos == 'center' ? height / 2 : height) / numticks;
|
|
var halfheight = height / 2;
|
|
|
|
co.beginPath();
|
|
for (var i=(notopendtick ? 1 : 0); i<=(numticks - (nobottomendtick || xaxispos == 'center'? 1 : 0)); ++i) {
|
|
pa(co, ['m',align == 'right' ? x + 3 : x - 3, Math.round(y + (gap *i)),'l',x, Math.round(y + (gap *i))]);
|
|
}
|
|
|
|
// Draw the bottom halves ticks if the X axis is in the center
|
|
if (xaxispos == 'center') {
|
|
for (var i=1; i<=numticks; ++i) {
|
|
pa(co, ['m',align == 'right' ? x + 3 : x - 3, Math.round(y + halfheight + (gap *i)),'l',x, Math.round(y + halfheight + (gap *i))]);
|
|
}
|
|
}
|
|
co.stroke();
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Draw the scale for the axes
|
|
*/
|
|
co.fillStyle = label_color;
|
|
//co.beginPath();
|
|
var text_len = 0;
|
|
if (scale_visible) {
|
|
if (labels_specific && labels_specific.length) {
|
|
|
|
var text_len = 0;
|
|
|
|
// First - gp through the labels to find the longest
|
|
for (var i=0,len=labels_specific.length; i<len; i+=1) {
|
|
text_len = Math.max(text_len, co.measureText(labels_specific[i]).width);
|
|
}
|
|
|
|
for (var i=0,len=labels_specific.length; i<len; ++i) {
|
|
|
|
var gap = (len-1) > 0 ? (height / (len-1)) : 0;
|
|
|
|
if (xaxispos == 'center') {
|
|
gap /= 2;
|
|
}
|
|
|
|
RG.Text2(this, {'font':font,
|
|
'size':size,
|
|
'x':x - (align == 'right' ? -5 : 5),
|
|
'y':(i * gap) + this.gutterTop,
|
|
'text':labels_specific[i],
|
|
'valign':'center',
|
|
'halign':align == 'right' ? 'left' : 'right',
|
|
'tag': 'scale'
|
|
});
|
|
|
|
/**
|
|
* Store the max length so that it can be used if necessary to determine
|
|
* whether the mouse is over the axis.
|
|
*/
|
|
this.maxLabelLength = ma.max(this.maxLabelLength, co.measureText(labels_specific[i]).width);
|
|
}
|
|
|
|
if (xaxispos == 'center') {
|
|
|
|
// It's "-2" so that the center label isn't added twice
|
|
for (var i=(labels_specific.length-2); i>=0; --i) {
|
|
|
|
RG.Text2(this, {'font':font,
|
|
'size':size,
|
|
'x':x - (align == 'right' ? -5 : 5),
|
|
'y':ca.height - this.gutterBottom - (i * gap),
|
|
'text':labels_specific[i],
|
|
'valign':'center',
|
|
'halign':align == 'right' ? 'left' : 'right',
|
|
'tag': 'scale'
|
|
});
|
|
}
|
|
}
|
|
|
|
} else {
|
|
|
|
for (var i=0; i<=numlabels; ++i) {
|
|
|
|
var original = ((max - min) * ((numlabels-i) / numlabels)) + min;
|
|
|
|
if (original == 0 && prop['chart.scale.zerostart'] == false) {
|
|
continue;
|
|
}
|
|
|
|
var text = RG.number_format(this, original.toFixed(decimals), units_pre, units_post);
|
|
var text = String(typeof(formatter) == 'function' ? formatter(this, original) : text);
|
|
|
|
// text_len is used below for positioning the title
|
|
var text_len = Math.max(text_len, co.measureText(text).width);
|
|
this.maxLabelLength = text_len;
|
|
|
|
if (invert) {
|
|
var y = height - ((height / numlabels)*i);
|
|
} else {
|
|
var y = (height / numlabels)*i;
|
|
}
|
|
|
|
if (prop['chart.xaxispos'] == 'center') {
|
|
y = y / 2;
|
|
}
|
|
|
|
// This fixes a bug, Replace this: -,400 with this: -400
|
|
text = text.replace(/^-,([0-9])/, '-$1');
|
|
|
|
|
|
/**
|
|
* Now - draw the labels
|
|
*/
|
|
RG.Text2(this, {'font':font,
|
|
'size':size,
|
|
'x':x - (align == 'right' ? -5 : 5),
|
|
'y':y + this.gutterTop,
|
|
'text':text,
|
|
'valign':'center',
|
|
'halign':align == 'right' ? 'left' : 'right',
|
|
'tag': 'scale'
|
|
});
|
|
|
|
|
|
|
|
/**
|
|
* Draw the bottom half of the labels if the X axis is in the center
|
|
*/
|
|
if (prop['chart.xaxispos'] == 'center' && i < numlabels) {
|
|
RG.Text2(this, {'font':font,
|
|
'size':size,
|
|
'x':x - (align == 'right' ? -5 : 5),
|
|
'y':ca.height - this.gutterBottom - y,
|
|
'text':'-' + text,
|
|
'valign':'center',
|
|
'halign':align == 'right' ? 'left' : 'right',
|
|
'tag': 'scale'
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//co.stroke();
|
|
|
|
/**
|
|
* Draw the title for the axes
|
|
*/
|
|
if (title) {
|
|
co.beginPath();
|
|
|
|
co.fillStyle = title_color;
|
|
if (labels_specific) {
|
|
|
|
var width = 0;
|
|
for (var i=0,len=labels_specific.length; i<len; i+=1) {
|
|
width = Math.max(width, co.measureText(labels_specific[i]).width);
|
|
}
|
|
|
|
} else {
|
|
var width = co.measureText(prop['chart.units.pre'] + prop['chart.max'].toFixed(prop['chart.scale.decimals']) + prop['chart.units.post']).width;
|
|
}
|
|
|
|
|
|
RG.Text2(this, {'font':font,
|
|
'size':size + 2,
|
|
'x':align == 'right' ? x + width + 8 : x - width - 8,
|
|
'y':height / 2 + this.gutterTop,
|
|
'text':title,
|
|
'valign':'bottom',
|
|
'halign':'center',
|
|
'angle':align == 'right' ? 90 : -90});
|
|
co.stroke();
|
|
}
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
* This detemines the maximum text width of either the scale or text
|
|
* labels - whichever is given
|
|
*
|
|
* @return number The maximum text width
|
|
*/
|
|
this.getWidth = function ()
|
|
{
|
|
var width = this.maxLabelLength;
|
|
|
|
// Add the title width if it's specified
|
|
if (prop['chart.title'] && prop['chart.title'].length) {
|
|
width += (prop['chart.text.size'] * 1.5);
|
|
}
|
|
|
|
this.width = width;
|
|
|
|
return width;
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}; |