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636 lines
20 KiB
JavaScript
636 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 only takes the ID (the HTML attribute) of the canvas as the
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* first argument - the gutters are set as properties.
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*
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* @param string id The canvas tag ID
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*/
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RGraph.Drawing.Background = 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.id === 'string') {
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var id = conf.id
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var canvas = document.getElementById(id);
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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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}
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this.id = id;
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this.canvas = document.getElementById(this.id);
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this.context = this.canvas.getContext('2d');
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this.canvas.__object__ = this;
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this.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.background';
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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.background.barcolor1': 'rgba(0,0,0,0)',
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'chart.background.barcolor2': 'rgba(0,0,0,0)',
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'chart.background.grid': true,
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'chart.background.grid.color': '#ddd',
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'chart.background.grid.width': 1,
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'chart.background.grid.vlines': true,
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'chart.background.grid.hlines': true,
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'chart.background.grid.border': true,
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'chart.background.grid.autofit':true,
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'chart.background.grid.autofit.numhlines': 5,
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'chart.background.grid.autofit.numvlines': 20,
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'chart.background.grid.dashed': false,
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'chart.background.grid.dotted': false,
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'chart.background.image': null,
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'chart.background.image.stretch': true,
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'chart.background.image.x': null,
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'chart.background.image.y': null,
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'chart.background.image.w': null,
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'chart.background.image.h': null,
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'chart.background.image.align': null,
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'chart.background.color': null,
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'chart.gutter.left': 25,
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'chart.gutter.right': 25,
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'chart.gutter.top': 25,
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'chart.gutter.bottom': 25,
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'chart.text.color': 'black', // Gradients aren't supported for this color
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'chart.text.size': 12,
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'chart.text.font': 'Arial',
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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.highlight': true,
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'chart.tooltips.event': 'onclick',
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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.linewidth': 1,
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'chart.title': '',
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'chart.title.size': null,
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'chart.title.font': null,
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'chart.title.background': null, // Gradients aren't supported for this color
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'chart.title.hpos': null,
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'chart.title.vpos': null,
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'chart.title.bold': true,
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'chart.title.color': 'black',
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'chart.title.x': null,
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'chart.title.y': null,
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'chart.title.halign': null,
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'chart.title.valign': null,
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'chart.title.xaxis': '',
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'chart.title.xaxis.bold': true,
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'chart.title.xaxis.size': null,
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'chart.title.xaxis.font': null,
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'chart.title.xaxis.x': null,
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'chart.title.xaxis.y': null,
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'chart.title.xaxis.pos': null,
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'chart.title.yaxis': '',
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'chart.title.yaxis.bold': true,
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'chart.title.yaxis.size': null,
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'chart.title.yaxis.font': null,
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'chart.title.yaxis.color': 'black', // Gradients aren't supported for this color
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'chart.title.yaxis.x': null,
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'chart.title.yaxis.y': null,
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'chart.title.yaxis.pos': null,
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}
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/**
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* A simple check that the browser has canvas support
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*/
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if (!this.canvas) {
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alert('[DRAWING.BACKGROUND] No canvas support');
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return;
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}
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/**
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* Create the dollar object so that functions can be added to them
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*/
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this.$0 = {};
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/**
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* Translate half a pixel for antialiasing purposes - but only if it hasn't beeen
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* done already
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*/
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if (!this.canvas.__rgraph_aa_translated__) {
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this.context.translate(0.5,0.5);
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this.canvas.__rgraph_aa_translated__ = true;
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}
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// Short variable names
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var RG = RGraph,
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ca = this.canvas,
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co = ca.getContext('2d'),
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prop = this.properties,
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pa = RG.Path,
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pa2 = RG.path2,
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win = window,
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doc = document,
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ma = Math
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/**
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* "Decorate" the object with the generic effects if the effects library has been included
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*/
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if (RG.Effects && typeof RG.Effects.decorate === 'function') {
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RG.Effects.decorate(this);
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}
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/**
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* A setter method for setting graph properties. It can be used like this: obj.Set('chart.strokestyle', '#666');
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*
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* @param name string The name of the property to set 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 circle
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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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* DRAW BACKGROUND HERE *
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***********************/
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this.gutterLeft = prop['chart.gutter.left'];
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this.gutterRight = prop['chart.gutter.right'];
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this.gutterTop = prop['chart.gutter.top'];
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this.gutterBottom = prop['chart.gutter.bottom'];
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/**
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* Set the shadow
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*/
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RG.drawBackgroundImage(this);
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RG.Background.draw(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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* 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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* @param object OPTIONAL You can pass in the bar object instead of the
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* function using "this"
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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 (
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mouseX >= this.gutterLeft
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&& mouseX <= (ca.width - this.gutterRight)
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&& mouseY >= this.gutterTop
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&& mouseY <= (ca.height - this.gutterBottom)
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) {
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var tooltip = prop['chart.tooltips'] ? prop['chart.tooltips'][0] : null
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return {
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0: this, 1: 0 /* the index */, 2: tooltip,
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'object': this,'index': 0, 'tooltip': tooltip
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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 = 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 tooltipX = RG.getCanvasXY(obj.canvas)[0] + ((obj.canvas.width - this.gutterLeft - this.gutterRight) / 2) + this.gutterLeft;
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var tooltipY = RG.getCanvasXY(obj.canvas)[1] + ((obj.canvas.height - this.gutterTop - this.gutterBottom) / 2) + this.gutterTop;
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// Set the top position
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tooltip.style.left = 0;
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tooltip.style.top = tooltipY - 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 ( (tooltipX - (width / 2)) < 10) {
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tooltip.style.left = (tooltipX - (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 ( (tooltipX + (width / 2)) > doc.body.offsetWidth) {
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tooltip.style.left = (tooltipX - (width * 0.9)) + 'px';
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img.style.left = ((width * 0.9) - 8.5) + 'px';
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// CENTERED
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} else {
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tooltip.style.left = (tooltipX - (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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//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.canvas.width + (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] + obj.gutterLeft ((obj.canvas.width - obj.gutterLeft - obj.gutterRight) / 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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* 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(co, ['b',
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'r', prop['chart.gutter.left'],
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prop['chart.gutter.top'],
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ca.width - prop['chart.gutter.left'] - prop['chart.gutter.right'],
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ca.height - prop['chart.gutter.top'] - prop['chart.gutter.bottom'],
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'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.strokestyle'] = RG.arrayClone(prop['chart.strokestyle']);
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this.original_colors['chart.highlight.stroke'] = RG.arrayClone(prop['chart.highlight.stroke']);
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this.original_colors['chart.highlight.fill'] = RG.arrayClone(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.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(this.gutterLeft, this.gutterTop, ca.width - this.gutterRight, ca.height - this.gutterRight);
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var diff = 1 / (parts.length - 1);
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//grad.addColorStop(0, RG.trim(parts[0]));
|
|
|
|
for (var j=0; j<parts.length; j+=1) {
|
|
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);
|
|
}
|
|
}; |