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810 lines
25 KiB
JavaScript
810 lines
25 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.
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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 label
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* @param number y The Y position of the label
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* @param number text The text used
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*/
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RGraph.Drawing.Image = 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.src === 'string'
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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 x = conf.x;
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var y = conf.y;
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var src = conf.src;
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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 src = arguments[3];
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}
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// id, x, y
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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.alignmentProcessed = false;
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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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* Store the properties
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*/
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this.x = x;
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this.y = y;
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this.src = src;
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this.img = new Image();
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this.img.src = this.src;
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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.image';
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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.src': null,
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'chart.width': null,
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'chart.height': null,
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'chart.halign': 'left',
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'chart.valign': 'top',
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'chart.events.mousemove': null,
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'chart.events.click': null,
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'chart.shadow': false,
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'chart.shadow.color': 'gray',
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'chart.shadow.offsetx': 3,
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'chart.shadow.offsety': 3,
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'chart.shadow.blur': 5,
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'chart.tooltips': null,
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'chart.tooltips.highlight': true,
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'chart.tooltips.css.class': 'RGraph_tooltip',
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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.alpha': 1,
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'chart.border': false,
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'chart.border.color': 'black',
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'chart.border.linewidth': 1,
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'chart.border.radius': 0,
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'chart.background.color': 'rgba(0,0,0,0)'
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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.IMAGE] No canvas support');
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return;
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}
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/**
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* This can be used to store the coordinates of shapes on the graph
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*/
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this.coords = [];
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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 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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var obj = this;
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this.img.onload = function ()
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{
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if (!obj.colorsParsed) {
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obj.parseColors();
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// Don't want to do this again
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obj.colorsParsed = true;
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}
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obj.width = this.width;
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obj.height = this.height;
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if (!this.alignmentProcessed) {
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var customWidthHeight = (typeof obj.properties['chart.width'] == 'number' && typeof obj.properties['chart.width'] == 'number');
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// Horizontal alignment
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if (obj.properties['chart.halign'] == 'center') {
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obj.x -= customWidthHeight ? (obj.properties['chart.width'] / 2) : (this.width / 2);
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} else if (obj.properties['chart.halign'] == 'right') {
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obj.x -= customWidthHeight ? obj.properties['chart.width'] : this.width;
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}
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// Vertical alignment
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if (obj.properties['chart.valign'] == 'center') {
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obj.y -= customWidthHeight ? (obj.properties['chart.height'] / 2) : (this.height / 2);
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} else if (obj.properties['chart.valign'] == 'bottom') {
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obj.y -= customWidthHeight ? obj.properties['chart.height'] : this.height;
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}
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// Don't do this again
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this.alignmentProcessed = true;
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}
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}
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// The onload event doesn't always fire - so call it manually as well
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if (this.img.complete || this.img.readyState === 4) {
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this.img.onload();
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}
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/**
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* Draw the image here
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*/
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if (prop['chart.shadow']) {
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RG.setShadow(this, prop['chart.shadow.color'], prop['chart.shadow.offsetx'], prop['chart.shadow.offsety'], prop['chart.shadow.blur']);
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}
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var oldAlpha = co.globalAlpha;
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co.globalAlpha = prop['chart.alpha'];
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/**
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* Draw a border around the image
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*/
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if (prop['chart.border']) {
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co.strokeStyle = prop['chart.border.color'];
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co.lineWidth = prop['chart.border.linewidth'];
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var borderRadius = 0;
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// Work out the borderRadius only if the image has been loaded
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if (this.width || this.height) {
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borderRadius = ma.min(this.width / 2, this.height / 2)
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}
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if ((prop['chart.width'] / 2) > borderRadius && (prop['chart.height'] / 2) > borderRadius) {
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borderRadius = ma.min((prop['chart.width'] / 2), (prop['chart.height'] / 2))
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}
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if (prop['chart.border.radius'] < borderRadius) {
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borderRadius = prop['chart.border.radius'];
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}
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co.beginPath();
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this.roundedRect(
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ma.round(this.x) - ma.round(co.lineWidth / 2),
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ma.round(this.y) - ma.round(co.lineWidth / 2),
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(prop['chart.width'] || this.img.width) + co.lineWidth,
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(prop['chart.height'] || this.img.height) + co.lineWidth,
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borderRadius
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);
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}
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if (borderRadius) {
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co.save();
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// Draw the rect that casts the shadow
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// Draw the background color
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this.drawBackgroundColor(borderRadius);
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// Clip the canvas
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co.beginPath();
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this.roundedRect(
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ma.round(this.x) - ma.round(co.lineWidth / 2),
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ma.round(this.y) - ma.round(co.lineWidth / 2),
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(prop['chart.width'] || this.img.width) + co.lineWidth,
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(prop['chart.height'] || this.img.height) + co.lineWidth,
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borderRadius
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);
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co.clip();
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} else {
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// Draw the background color
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this.drawBackgroundColor(0);
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}
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RG.noShadow(this);
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if (typeof prop['chart.height'] === 'number' || typeof prop['chart.width'] === 'number') {
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co.drawImage(
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this.img,
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ma.round(this.x),
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ma.round(this.y),
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prop['chart.width'] || this.width,
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prop['chart.height'] || this.height
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);
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} else {
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co.drawImage(
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this.img,
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ma.round(this.x),
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ma.round(this.y)
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);
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}
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// If borderRadius is enabled restore the canvas to it's pre-clipped state
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if (borderRadius) {
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co.restore();
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}
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// If the border is enabled need a stroke so that the border is drawn
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if (prop['chart.border']) {
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RG.noShadow(this);
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co.stroke();
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}
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co.globalAlpha = oldAlpha;
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//var obj = this;
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this.img.onload = function ()
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{
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RG.redrawCanvas(ca);
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obj.coords[0] = [Math.round(obj.x), Math.round(obj.y), typeof(prop['chart.width']) == 'number' ? prop['chart.width'] : this.width, typeof prop['chart.height'] == 'number' ? prop['chart.height'] : this.height];
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}
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RG.NoShadow(this);
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/**
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* This installs the event listeners
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*/
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RG.InstallEventListeners(this);
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/**
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* Fire the onfirstdraw event
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*/
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if (this.firstDraw) {
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RG.fireCustomEvent(this, 'onfirstdraw');
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this.firstDraw = false;
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this.firstDrawFunc();
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}
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/**
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* Fire the ondraw event
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*/
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RG.FireCustomEvent(this, 'ondraw');
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return this;
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};
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/**
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* Used in chaining. Runs a function there and then - not waiting for
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* the events to fire (eg the onbeforedraw event)
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*
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* @param function func The function to execute
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*/
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this.exec = function (func)
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{
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func(this);
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return this;
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};
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/**
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* The getObjectByXY() worker method
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*/
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this.getObjectByXY = function (e)
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{
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var mouseXY = RG.getMouseXY(e);
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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 = RG.getMouseXY(e);
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var mouseX = mouseXY[0];
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var mouseY = mouseXY[1];
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if ( this.coords
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&& this.coords[0]
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&& mouseXY[0] >= this.coords[0][0]
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&& mouseXY[0] <= (this.coords[0][0] + this.coords[0][2])
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&& mouseXY[1] >= this.coords[0][1]
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&& mouseXY[1] <= (this.coords[0][1] + this.coords[0][3])) {
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return {
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0: this, 1: this.coords[0][0], 2: this.coords[0][1], 3: this.coords[0][2], 4: this.coords[0][3], 5: 0,
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'object': this, 'x': this.coords[0][0], 'y': this.coords[0][1], 'width': this.coords[0][2], 'height': this.coords[0][3], '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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// Set the top position
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tooltip.style.left = 0;
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tooltip.style.top = canvasXY[1] - height - 7 + this.coords[0][1] + (obj.coords[0][3] / 2) + 'px';
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// By default any overflow is hidden
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tooltip.style.overflow = '';
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// The arrow
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var img = new Image();
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img.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABEAAAAFCAYAAACjKgd3AAAARUlEQVQYV2NkQAN79+797+RkhC4M5+/bd47B2dmZEVkBCgcmgcsgbAaA9GA1BCSBbhAuA/AagmwQPgMIGgIzCD0M0AMMAEFVIAa6UQgcAAAAAElFTkSuQmCC';
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img.style.position = 'absolute';
|
|
img.id = '__rgraph_tooltip_pointer__';
|
|
img.style.top = (tooltip.offsetHeight - 2) + 'px';
|
|
tooltip.appendChild(img);
|
|
|
|
// Reposition the tooltip if at the edges:
|
|
|
|
// LEFT edge
|
|
if ((canvasXY[0] + obj.coords[0][0] + (obj.coords[0][2] / 2) - (width / 2)) < 10) {
|
|
tooltip.style.left = (canvasXY[0] + this.coords[0][0] + (this.coords[0][2] / 2) - (width * 0.1)) + 'px';
|
|
img.style.left = ((width * 0.1) - 8.5) + 'px';
|
|
|
|
// RIGHT edge
|
|
} else if ((canvasXY[0] + this.coords[0][0] + (this.coords[0][2] / 2) + (width / 2)) > doc.body.offsetWidth) {
|
|
tooltip.style.left = (canvasXY[0] + this.coords[0][0] + (this.coords[0][2] / 2) - (width * 0.9)) + 'px';
|
|
img.style.left = ((width * 0.9) - 8.5) + 'px';
|
|
|
|
// Default positioning - CENTERED
|
|
} else {
|
|
tooltip.style.left = (canvasXY[0] + this.coords[0][0] + (this.coords[0][2] / 2) - (width * 0.5)) + 'px';
|
|
img.style.left = ((width * 0.5) - 8.5) + 'px';
|
|
}
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
* Each object type has its own Highlight() function which highlights the appropriate shape
|
|
*
|
|
* @param object shape The shape to highlight
|
|
*/
|
|
this.highlight =
|
|
this.Highlight = function (shape)
|
|
{
|
|
if (prop['chart.tooltips.highlight']) {
|
|
pa(co, ['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']]);
|
|
}
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
* This allows for easy specification of gradients
|
|
*/
|
|
this.parseColors = function ()
|
|
{
|
|
|
|
// Save the original colors so that they can be restored when the canvas is reset
|
|
if (this.original_colors.length === 0) {
|
|
this.original_colors['chart.highlight.stroke'] = RG.array_clone(prop['chart.highlight.stroke']);
|
|
this.original_colors['chart.highlight.fill'] = RG.array_clone(prop['chart.highlight.fill']);
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
* Parse various properties for colors
|
|
*/
|
|
prop['chart.highlight.stroke'] = this.parseSingleColorForGradient(prop['chart.highlight.stroke']);
|
|
prop['chart.highlight.fill'] = this.parseSingleColorForGradient(prop['chart.highlight.fill']);
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
* Use this function to reset the object to the post-constructor state. Eg reset colors if
|
|
* need be etc
|
|
*/
|
|
this.reset = function ()
|
|
{
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
* This parses a single color value
|
|
*/
|
|
this.parseSingleColorForGradient = function (color)
|
|
{
|
|
if (!color) {
|
|
return color;
|
|
}
|
|
|
|
|
|
if (typeof color === 'string' && color.match(/^gradient\((.*)\)$/i)) {
|
|
|
|
var parts = RegExp.$1.split(':');
|
|
|
|
// Create the gradient
|
|
var grad = co.createLinearGradient(this.x, this.y, this.x + this.img.width, this.y);
|
|
|
|
var diff = 1 / (parts.length - 1);
|
|
|
|
grad.addColorStop(0, RG.trim(parts[0]));
|
|
|
|
for (var j=1; j<parts.length; ++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 ()
|
|
{
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
* This draws a rectangle for the border of the image with optional rounded corners
|
|
*/
|
|
this.roundedRect = function (x, y, width, height, radius)
|
|
{
|
|
// Save the existing state of the canvas so that it can be restored later
|
|
co.save();
|
|
|
|
// Translate to the given X/Y coordinates
|
|
co.translate(x, y);
|
|
|
|
// Move to the center of the top horizontal line
|
|
co.moveTo(width / 2,0);
|
|
|
|
// Draw the rounded corners. The connecting lines in between them are drawn automatically
|
|
co.arcTo(width,0,width,height, ma.min(height / 2, radius));
|
|
co.arcTo(width, height, 0, height, ma.min(width / 2, radius));
|
|
co.arcTo(0, height, 0, 0, ma.min(height / 2, radius));
|
|
co.arcTo(0, 0, radius, 0, ma.min(width / 2, radius));
|
|
|
|
// Draw a line back to the start coordinates
|
|
co.lineTo(width / 2,0);
|
|
|
|
// Restore the state of the canvas to as it was before the save()
|
|
co.restore();
|
|
};
|
|
|
|
|
|
|
|
|
|
/**
|
|
*
|
|
*/
|
|
this.drawBackgroundColor = function (borderRadius)
|
|
{
|
|
co.beginPath();
|
|
co.fillStyle = prop['chart.background.color'];
|
|
this.roundedRect(
|
|
ma.round(this.x) - ma.round(co.lineWidth / 2),
|
|
ma.round(this.y) - ma.round(co.lineWidth / 2),
|
|
(prop['chart.width'] || this.img.width) + co.lineWidth,
|
|
(prop['chart.height'] || this.img.height) + co.lineWidth,
|
|
borderRadius
|
|
);
|
|
co.fill();
|
|
};
|
|
|
|
|
|
|
|
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);
|
|
}
|
|
}; |