mirror of
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648 lines
20 KiB
JavaScript
648 lines
20 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 th X position, the Y position and then the text to show
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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 text
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* @param number y The Y position of the text
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* @param number text The text to show
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*/
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RGraph.Drawing.Text = 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.text === 'string'
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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 y = conf.y;
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var text = conf.text;
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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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var y = arguments[2];
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var text = arguments[3];
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}
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this.id = id;
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this.canvas = document.getElementById(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.x = x;
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this.y = y;
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this.text = String(text);
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this.coords = [];
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this.coordsText = [];
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this.original_colors = [];
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this.firstDraw = true; // After the first draw this will be false
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/**
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* This defines the type of this shape
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*/
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this.type = 'drawing.text';
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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.size': 10,
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'chart.font': 'Arial',
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'chart.bold': false,
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'chart.angle': 0,
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'chart.colors': ['black'],
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'chart.events.click': null,
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'chart.events.mousemove': null,
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'chart.highlight.stroke': '#ccc',
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'chart.highlight.fill': 'rgba(255,255,255,0.7)',
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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.tooltips.highlight': true,
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'chart.tooltips.coords.page': false,
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'chart.bounding': false,
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'chart.bounding.fill': 'rgba(255,255,255,0.7)',
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'chart.bounding.stroke': '#777',
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'chart.bounding.shadow': false,
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'chart.bounding.shadow.color': '#ccc',
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'chart.bounding.shadow.blur': 3,
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'chart.bounding.shadow.offsetx': 3,
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'chart.bounding.shadow.offsety': 3,
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'chart.marker': false,
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'chart.halign': 'left',
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'chart.valign': 'bottom',
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'chart.link': null,
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'chart.link.target': '_self',
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'chart.link.options': ''
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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.TEXT] 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 rectangle
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*/
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this.draw =
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this.Draw = function ()
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{
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/**
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* Fire the onbeforedraw event
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*/
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RG.FireCustomEvent(this, 'onbeforedraw');
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/**
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* 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 the coods array from growing
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*/
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this.coords = [];
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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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* The font, its size and whether its bold or not can be set by properties,
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* so now they have been (potentiall) set - measure the text
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*/
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/**
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* Measure the text and add the width/height
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*
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* text, bold, font, size
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*
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*/
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var dimensions = RG.MeasureText(this.text, prop['chart.text.bold'],prop['chart.text.font'], prop['chart.text.size']);
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// ------------- DRAW TEXT HERE -------------
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co.fillStyle = prop['chart.colors'][0];
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var ret = RG.Text2(this, {'font': prop['chart.font'],
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'size': prop['chart.size'],
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'x': this.x,
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'y': this.y,
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'text': this.text,
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'bold': prop['chart.bold'],
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'angle': prop['chart.angle'],
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'bounding': prop['chart.bounding'],
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'bounding.fill': prop['chart.bounding.fill'],
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'bounding.stroke': prop['chart.bounding.stroke'],
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'bounding.shadow': prop['chart.bounding.shadow'],
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'bounding.shadow.color': prop['chart.bounding.shadow.color'],
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'bounding.shadow.blur': prop['chart.bounding.shadow.blur'],
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'bounding.shadow.offsetx': prop['chart.bounding.shadow.offsetx'],
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'bounding.shadow.offsety': prop['chart.bounding.shadow.offsety'],
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'marker': prop['chart.marker'],
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'halign': prop['chart.halign'],
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'valign': prop['chart.valign']
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});
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// store the dimensions
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this.coords.push({
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0: ret.x, 'x': ret.x,
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1: ret.y, 'y': ret.y,
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2: ret.width, 'width': ret.width,
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3: ret.height, 'height': ret.height
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});
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/**
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* This installs the event listeners
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*/
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RG.InstallEventListeners(this);
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/**
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* Fire the onfirstdraw event
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*/
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if (this.firstDraw) {
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RG.fireCustomEvent(this, 'onfirstdraw');
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this.firstDraw = false;
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this.firstDrawFunc();
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}
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/**
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* Fire the ondraw event
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*/
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RG.FireCustomEvent(this, 'ondraw');
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return this;
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};
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/**
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* Used in chaining. Runs a function there and then - not waiting for
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* the events to fire (eg the onbeforedraw event)
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*
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* @param function func The function to execute
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*/
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this.exec = function (func)
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{
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func(this);
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return this;
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};
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/**
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* The getObjectByXY() worker method
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*/
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this.getObjectByXY = function (e)
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{
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if (this.getShape(e)) {
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return this;
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}
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};
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/**
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* Not used by the class during creating the graph, but is used by event handlers
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* to get the coordinates (if any) of the selected 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 prop = this.properties;
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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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for (var i=0,len=this.coords.length; i<len; i++) {
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var left = coords[i].x;
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var top = coords[i].y;
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var width = coords[i].width;
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var height = coords[i].height;
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if (mouseX >= left && mouseX <= (left + width) && mouseY >= top && mouseY <= (top + height)) {
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return {
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0: this, 1: left, 2: top, 3: width, 4: height, 5: 0,
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'object': this, 'x': left, 'y': top, 'width': width, 'height': height, 'index': 0, 'tooltip': prop['chart.tooltips'] ? prop['chart.tooltips'][0] : null
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};
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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 coords = obj.coords[0];
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var coordX = coords.x;
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var coordY = coords.y;
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var coordW = coords.width;
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var coordH = coords.height;
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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 = canvasXY[1] + coordY + (coordH / 2) - height + 'px';
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// By default any overflow is hidden
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tooltip.style.overflow = '';
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// The arrow
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var img = new Image();
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img.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABEAAAAFCAYAAACjKgd3AAAARUlEQVQYV2NkQAN79+797+RkhC4M5+/bd47B2dmZEVkBCgcmgcsgbAaA9GA1BCSBbhAuA/AagmwQPgMIGgIzCD0M0AMMAEFVIAa6UQgcAAAAAElFTkSuQmCC';
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img.style.position = 'absolute';
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img.id = '__rgraph_tooltip_pointer__';
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img.style.top = (tooltip.offsetHeight - 2) + 'px';
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tooltip.appendChild(img);
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// Reposition the tooltip if at the edges:
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// LEFT edge
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if ((canvasXY[0] + coordX + (coordW / 2) - (width / 2)) < 10) {
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tooltip.style.left = (canvasXY[0] + coordX - (width * 0.1)) + (coordW / 2) + 'px';
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img.style.left = ((width * 0.1) - 8.5) + 'px';
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// RIGHT edge
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} else if ((canvasXY[0] + coordX + (coordW / 2) + (width / 2)) > (doc.body.offsetWidth - 10)) {
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tooltip.style.left = canvasXY[0] + coordX - (width * 0.9) + (coordW / 2) + 'px';
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img.style.left = ((width * 0.9) - 8.5) + 'px';
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// Default positioning - CENTERED
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} else {
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tooltip.style.left = (canvasXY[0] + coordX + (coordW / 2) - (width * 0.5)) + 'px';
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img.style.left = ((width * 0.5) - 8.5) + 'px';
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}
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};
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/**
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* Each object type has its own Highlight() function which highlights the appropriate shape
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*
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* @param object shape The shape to highlight
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*/
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this.highlight =
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this.Highlight = function (shape)
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{
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// Add the new highlight
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RG.Highlight.Rect(this, shape);
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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'])[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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/**
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* Parse various properties for colors
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*/
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prop['chart.colors'][0] = this.parseSingleColorForGradient(prop['chart.colors'][0]);
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prop['chart.fillstyle'] = this.parseSingleColorForGradient(prop['chart.fillstyle']);
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prop['chart.strokestyle'] = this.parseSingleColorForGradient(prop['chart.strokestyle']);
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prop['chart.highlight.stroke'] = this.parseSingleColorForGradient(prop['chart.highlight.stroke']);
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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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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, RGraph.trim(parts[0]));
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|
|
for (var j=1,len=parts.length; j<len; ++j) {
|
|
grad.addColorStop(j * diff, RG.trim(parts[j]));
|
|
}
|
|
}
|
|
|
|
return grad ? grad : color;
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}; |