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568 lines
17 KiB
JavaScript
568 lines
17 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 data as the second. If you need to change this, you can. Alternatively it can take
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* a single JSON-style configuration object
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*
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* @param string id The canvas tag ID
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* @param number x The X position of the marker
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* @param number y The Y position of the marker
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* @param number text The max radius of the pulsing circle
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*/
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RGraph.Drawing.Marker3 = 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.y === 'number'
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&& typeof conf.id === 'string'
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&& typeof conf.radius === 'number') {
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var id = conf.id
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var canvas = document.getElementById(id);
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var x = conf.x;
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var y = conf.y;
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var radius = conf.radius;
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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 canvas = document.getElementById(id);
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var x = arguments[1];
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var y = arguments[2];
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var radius = arguments[3];
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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.original_colors = [];
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this.firstDraw = true; // After the first draw this will be false
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// The actual radius is what is used to draw the marker - the other radius is the maximum target radius
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// that the marker grows to
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this.actualRadius = 0;
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// This is the alpha value that is used to fade out the pulsing marker
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this.alpha = 1;
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/**
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* Store the properties
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*/
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this.centerx = x;
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this.centery = y;
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this.radius = radius;
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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.marker3';
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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.fillstyle': 'rgba(255,255,255,1)',
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'chart.delay': 50,
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'chart.events.click': null,
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'chart.events.mousemove': null,
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'chart.highlight.fill': 'rgba(255,0,0,1.0)',
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'chart.tooltips': null,
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'chart.tooltips.highlight': true,
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'chart.tooltips.event': 'onclick'
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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.MARKER3] No canvas support');
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return;
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}
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/**
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* These are used to store coords
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*/
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this.coords = [];
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this.coordsText = [];
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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 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 propertyy 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 marker
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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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// Draw a circle to start with
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co.globalAlpha = this.alpha;
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pa(this, [
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'b',
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'a', this.centerx, this.centery, this.actualRadius, 0, 2 * Math.PI,false,
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'a', this.centerx, this.centery, ma.max(this.actualRadius - 8, 0), 2 * Math.PI,0, true,
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'f', prop['chart.fillstyle']]
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);
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this.alpha = this.actualRadius ? 1 - ( (this.actualRadius * 0.75) / this.radius) : 1;
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co.globalAlpha = 1;
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if (this.actualRadius < this.radius) {
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this.actualRadius += 2;
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} else if (this.actualRadius >= this.radius) {
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this.actualRadius = 0;
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this.alpha = 1;
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}
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var obj = this;
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setTimeout(function ()
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{
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RG.redrawCanvas(ca);
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}, prop['chart.delay']);
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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 shape, 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 mouseXY = RGraph.getMouseXY(e);
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var mouseX = mouseXY[0];
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var mouseY = mouseXY[1];
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if (RG.getHypLength(this.centerx, this.centery, mouseXY[0], mouseXY[1]) <= this.radius) {
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return {
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0: this, 1: this.centerx, 2: this.centery, 3: this.radius, 4: null, 5: 0,
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'object': this, 'x': this.centerx, 'y': this.centery, 'radius': this.radius, '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 object tooltip The tooltips DIV element
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* @param number idx The index of the tooltip
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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 = RG.getCanvasXY(obj.canvas);
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var width = tooltip.offsetWidth;
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var height = tooltip.offsetHeight;
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var radius = this.radius;
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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] + obj.centery - 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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// Reposition the tooltip if at the edges:
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// LEFT edge
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if ((canvasXY[0] + obj.centerx - (width / 2)) < 10) {
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tooltip.style.left = (canvasXY[0] + this.centerx - (width * 0.1)) + '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] + obj.centerx + (width / 2)) > doc.body.offsetWidth) {
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tooltip.style.left = canvasXY[0] + this.centerx - (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 = (canvasXY[0] + this.centerx - (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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if (prop['chart.tooltips.highlight']) {
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pa(this, ['b','r',this.coords[0][0],this.coords[0][1],this.coords[0][2],this.coords[0][3],'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.highlight.fill'] = RG.array_clone(prop['chart.highlight.fill']);
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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.fillstyle'] = this.parseSingleColorForGradient(prop['chart.fillstyle']);
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prop['chart.highlight.fill'] = this.parseSingleColorForGradient(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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var canvas = this.canvas;
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var context = this.context;
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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.createRadialGradient(this.centerx, this.centery, 0, this.centerx, this.centery, this.radius);
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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=0; j<parts.length; j+=1) {
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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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* 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 (parseConfObjectForOptions) {
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RG.parseObjectStyleConfig(this, conf.options);
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}
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}; |