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623 lines
18 KiB
JavaScript
623 lines
18 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, then the coordinates of the coords of the shape
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*
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* @param string id The canvas tag ID
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* @param number coords The coordinates of the shape
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*/
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RGraph.Drawing.Poly = 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.coords === 'object'
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&& typeof conf.id === 'string') {
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var id = conf.id
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var coords = conf.coords;
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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 coords = 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.colorsParsed = false;
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this.canvas.__object__ = this;
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this.coords = 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.poly';
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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.linewidth': 1,
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'chart.strokestyle': 'black',
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'chart.fillstyle': 'red',
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'chart.events.click': null,
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'chart.events.mousemove': null,
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'chart.tooltips': null,
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'chart.tooltips.override': 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.tooltips.highlight': true,
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'chart.highlight.stroke': 'rgba(0,0,0,0)',
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'chart.highlight.fill': 'rgba(255,255,255,0.7)',
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'chart.shadow': false,
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'chart.shadow.color': 'rgba(0,0,0,0.2)',
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'chart.shadow.offsetx': 3,
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'chart.shadow.offsety': 3,
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'chart.shadow.blur': 5
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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.POLY] 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 properties.
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*
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* @param name string The name of the property to set OR it can be a map
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* of name/value settings like what you set in the constructor
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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 shape
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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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* 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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/**
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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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* DRAW THE SHAPE HERE
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*/
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var obj = this;
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pa(this, ['b','fu',function (obj){if (prop['chart.shadow'])
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{
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co.shadowColor = prop['chart.shadow.color'];
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co.shadowOffsetX = prop['chart.shadow.offsetx'];
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co.shadowOffsetY = prop['chart.shadow.offsety'];
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co.shadowBlur = prop['chart.shadow.blur'];
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}},'fu',function (obj)
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{
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co.strokeStyle=prop['chart.strokestyle'];
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co.fillStyle=prop['chart.fillstyle'];
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obj.DrawPoly();
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},'lw',prop['chart.linewidth'],'f',prop['chart.fillstyle'], 'fu', function ()
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{
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RG.NoShadow(obj);
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}, 's',prop['chart.strokestyle']]);
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/**
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* Turn off shadow again
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*/
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RG.NoShadow(this)
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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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* Draw the Poly but doesn't stroke or fill - that's left to other functions
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*/
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this.drawPoly =
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this.DrawPoly = function ()
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{
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var coords = this.coords;
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pa(this, ['b','m',coords[0][0], coords[0][1]]);
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// Draw lines to subsequent coords
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for (var i=1,len=coords.length; i<len; ++i) {
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co.lineTo(coords[i][0],coords[i][1]);
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}
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// Close the path and stroke/fill it with whatever the current fill/stroke styles are
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pa(this, ['lw', prop['chart.linewidth'], 'c','f',co.fillStyle, 's',co.strokeStyle]);
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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 bar
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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 coords = this.coords;
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var mouseXY = RGraph.getMouseXY(e);
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var mouseX = mouseXY[0];
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var mouseY = mouseXY[1];
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// Should redraw the poly but not stroke or fill it and then use isPointInPath() to test it
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// DON'T USE PATH OBJECT HERE
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co.beginPath();
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co.strokeStyle = 'rgba(0,0,0,0)';
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co.fillStyle = 'rgba(0,0,0,0)';
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this.DrawPoly();
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if (co.isPointInPath(mouseX, mouseY)) {
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return {
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0: this, 1: this.coords, 2: 0,
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'object': this, 'coords': this.coords, '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 canvasXY = RGraph.getCanvasXY(obj.canvas);
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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 = (y - height - 7) + '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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/**
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* Reposition the tooltip if at the edges:
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*/
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// LEFT edge
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if (x - (width / 2) < 10) {
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tooltip.style.left = (canvasXY[0] + x - (width * 0.1)) - 8.5+ '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 ((x + (width / 2)) > doc.body.offsetWidth) {
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tooltip.style.left = x - (width * 0.9) + '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 = x - (width / 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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// Evidentally this is necessary
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co.fillStyle = prop['chart.fillstyle'];
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// Add the new highlight
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if (prop['chart.tooltips.highlight']) {
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pa(this, ['b','fu', function (obj){obj.DrawPoly();},'f',prop['chart.highlight.fill'],'s',prop['chart.highlight.stroke']]);
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}
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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.fillstyle'] = RG.array_clone(prop['chart.fillstyle']);
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this.original_colors['chart.strokestyle'] = RG.array_clone(prop['chart.strokestyle']);
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this.original_colors['chart.highlight.stroke'] = RG.array_clone(prop['chart.highlight.stroke']);
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this.original_colors['chart.highlight.fill'] = RG.array_clone(prop['chart.highlight.fill']);
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}
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var func = this.parseSingleColorForGradient;
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/**
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* Parse various properties for colors
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*/
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prop['chart.fillstyle'] = func(prop['chart.fillstyle']);
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prop['chart.strokestyle'] = func(prop['chart.strokestyle']);
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prop['chart.highlight.stroke'] = func(prop['chart.highlight.stroke']);
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prop['chart.highlight.fill'] = func(prop['chart.highlight.fill']);
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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(0,0,ca.width,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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* Using a function to add events makes it easier to facilitate method chaining
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*
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* @param string type The type of even to add
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* @param function func
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*/
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this.on = function (type, func)
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{
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if (type.substr(0,2) !== 'on') {
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type = 'on' + type;
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}
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this[type] = func;
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return this;
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};
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/**
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* This function runs once only
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* (put at the end of the file (before any effects))
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*/
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this.firstDrawFunc = function ()
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{
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};
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RG.att(ca);
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/**
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* Objects are now always registered so that the chart is redrawn if need be.
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*/
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RG.Register(this);
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/**
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* This is the 'end' of the constructor so if the first argument
|
|
* contains configuration data - handle that.
|
|
*/
|
|
if (parseConfObjectForOptions) {
|
|
RG.parseObjectStyleConfig(this, conf.options);
|
|
}
|
|
}; |