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# easyPieChart
> Lightweight plugin to render simple, animated and retina optimized pie charts
[](https://travis-ci.org/rendro/easy-pie-chart)
[](https://david-dm.org/rendro/easy-pie-chart)
[](https://github.com/igrigorik/ga-beacon)
## Features
[](http://drbl.in/ezuc)
* highly customizable
* very easy to implement
* resolution independent (retina optimized)
* uses `requestAnimationFrame` for smooth animations on modern devices and
* works in all modern browsers, even in IE7+ with [excanvas](https://code.google.com/p/explorercanvas/wiki/Instructions)
#### framework support
* Vanilla JS *(no dependencies)* (~872 bytes)
* jQuery plugin (~921 bytes)
* Angular Module (~983 bytes)
## Get started
#### Installation
You can also use [bower](http://bower.io) to install the component:
```
$ bower install jquery.easy-pie-chart
```
#### jQuery
To use the easy pie chart plugin you need to load the current version of jQuery (> 1.6.4) and the source of the plugin.
```html
<div class="chart" data-percent="73" data-scale-color="#ffb400">73%</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script src="/path/to/jquery.easy-pie-chart.js"></script>
<script>
$(function() {
$('.chart').easyPieChart({
//your options goes here
});
});
</script>
```
#### Vanilla JS
If you don't want to use jQuery, implement the Vanilla JS version without any dependencies.
```html
<div class="chart" data-percent="73">73%</div>
<script src="/path/to/easy-pie-chart.js"></script>
<script>
var element = document.querySelector('.chart');
new EasyPieChart(element, {
// your options goes here
});
</script>
```
#### AngularJS
```html
<div ng-controller="chartCtrl">
<div easypiechart options="options" percent="percent"></div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.9/angular.min.js"></script>
<script src="../dist/angular.easypiechart.min.js"></script>
<script>
var app = angular.module('app', ['easypiechart']);
app.controller('chartCtrl', ['$scope', function ($scope) {
$scope.percent = 65;
$scope.options = {
animate:{
duration:0,
enabled:false
},
barColor:'#2C3E50',
scaleColor:false,
lineWidth:20,
lineCap:'circle'
};
}]);
</script>
```
## Options
You can pass these options to the initialize function to set a custom look and feel for the plugin.
<table>
<tr>
<th>Property (Type)</th>
<th>Default</th>
<th>Description</th>
</tr>
<tr>
<td><strong>barColor</strong></td>
<td>#ef1e25</td>
<td>The color of the curcular bar. You can either pass a valid css color string, or a function that takes the current percentage as a value and returns a valid css color string.</td>
</tr>
<tr>
<td><strong>trackColor</strong></td>
<td>#f2f2f2</td>
<td>The color of the track, or false to disable rendering.</td>
</tr>
<tr>
<td><strong>scaleColor</strong></td>
<td>#dfe0e0</td>
<td>The color of the scale lines, false to disable rendering.</td>
</tr>
<tr>
<td><strong>scaleLength</strong></td>
<td>5</td>
<td>Length of the scale lines (reduces the radius of the chart).</td>
</tr>
<tr>
<td><strong>lineCap</strong></td>
<td>round</td>
<td>Defines how the ending of the bar line looks like. Possible values are: <code>butt</code>, <code>round</code> and <code>square</code>.</td>
</tr>
<tr>
<td><strong>lineWidth</strong></td>
<td>3</td>
<td>Width of the chart line in px.</td>
</tr>
<tr>
<td><strong>size</strong></td>
<td>110</td>
<td>Size of the pie chart in px. It will always be a square.</td>
</tr>
<tr>
<td><strong>rotate</strong></td>
<td>0</td>
<td>Rotation of the complete chart in degrees.</td>
</tr>
<tr>
<td><strong>animate</strong></td>
<td>object</td>
<td>Object with time in milliseconds and boolean for an animation of the bar growing (<code>{ duration: 1000, enabled: true }</code>), or false to deactivate animations.</td>
</tr>
<tr>
<td><strong>easing</strong></td>
<td>defaultEasing</td>
<td>Easing function or string with the name of a <a href="http://gsgd.co.uk/sandbox/jquery/easing/" target="_blank">jQuery easing function</a></td>
</tr>
</table>
## Callbacks
All callbacks will only be called if `animate` is not `false`.
<table>
<tr>
<th>Callback(params, ...)</th>
<th>Description</th>
</tr>
<tr>
<td><strong>onStart(from, to)</strong></td>
<td>Is called at the start of any animation.</td>
</tr>
<tr>
<td><strong>onStep(from, to, currentValue)</strong></td>
<td>Is called during animations providing the current value (the method is scoped to the context of th eplugin, so you can access the DOM element via <code>this.el</code>).</td>
</tr>
<tr>
<td><strong>onStop(from, to)</strong></td>
<td>Is called at the end of any animation.</td>
</tr>
</table>
## Plugin api
#### jQuery
```javascript
$(function() {
// instantiate the plugin
...
// update
$('.chart').data('easyPieChart').update(40);
...
// disable animation
$('.chart').data('easyPieChart').disableAnimation();
...
// enable animation
$('.chart').data('easyPieChart').enableAnimation();
});
```
#### Vanilla JS
```javascript
// instantiate the plugin
var chart = new EasyPieChart(element, options);
// update
chart.update(40);
// disable animation
chart.disableAnimation();
// enable animation
chart.enableAnimation();
```
###### Using a gradient
```javascript
new EasyPieChart(element, {
barColor: function(percent) {
var ctx = this.renderer.ctx();
var canvas = this.renderer.canvas();
var gradient = ctx.createLinearGradient(0,0,canvas.width,0);
gradient.addColorStop(0, "#ffe57e");
gradient.addColorStop(1, "#de5900");
return gradient;
}
});
```
#### AngularJS
For a value binding you need to add the `percent` attribute and bind it to your controller.
#### RequireJS
When using [RequireJS](http://requirejs.org) you can define your own name. Examples can be found in the `demo/requirejs.html`.
## Browser Support
Native support
* Chrome
* Safari
* FireFox
* Opera
* Internet Explorer 9+
Support for Internet Explorer 7 and 8 with [excanvas](https://code.google.com/p/explorercanvas/wiki/Instructions) polyfill.
## Test
To run the test just use the karma adapter of grunt: `grunt test`
## Credits
Thanks to [Rafal Bromirski](http://www.paranoida.com/) for designing [this dribble shot](http://drbl.in/ezuc) which inspired me building this plugin.
## Copyright
Copyright (c) 2014 Robert Fleischmann, contributors. Released under the MIT, GPL licenses