easyPieChart

Lightweight plugin to render simple, animated and retina optimized pie charts

Features

• 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

framework support

• Vanilla JS (no dependencies) (~872 bytes)
• jQuery plugin (~921 bytes)
• Angular Module (~983 bytes)

Get started

Installation

You can also use bower 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.

<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.

<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

<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.

Property (Type)	Default	Description
barColor	#ef1e25	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.
trackColor	#f2f2f2	The color of the track, or false to disable rendering.
trackWidth	undefined	Falls back to lineWidth if not provided.
scaleColor	#dfe0e0	The color of the scale lines, false to disable rendering.
scaleLength	5	Length of the scale lines (reduces the radius of the chart).
lineCap	round	Defines how the ending of the bar line looks like. Possible values are: butt, round and square.
lineWidth	3	Width of the chart line in px.
size	110	Size of the pie chart in px. It will always be a square.
rotate	0	Rotation of the complete chart in degrees.
animate	object	Object with time in milliseconds and boolean for an animation of the bar growing ({ duration: 1000, enabled: true }), or false to deactivate animations.
easing	defaultEasing	Easing function or string with the name of a jQuery easing function

Callbacks

All callbacks will only be called if animate is not false.

Callback(params, ...)	Description
onStart(from, to)	Is called at the start of any animation.
onStep(from, to, currentValue)	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 this.el).
onStop(from, to)	Is called at the end of any animation.

Plugin api

jQuery

$(function() {
    // instantiate the plugin
    ...
    // update
    $('.chart').data('easyPieChart').update(40);
    ...
    // disable animation
    $('.chart').data('easyPieChart').disableAnimation();
    ...
    // enable animation
    $('.chart').data('easyPieChart').enableAnimation();
});

Vanilla JS

// instantiate the plugin
var chart = new EasyPieChart(element, options);
// update
chart.update(40);
// disable animation
chart.disableAnimation();
// enable animation
chart.enableAnimation();

Using a gradient

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 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 polyfill.

Test

To run the test just use the karma adapter of grunt: grunt test

Credits

Thanks to Rafal Bromirski for designing this dribble shot which inspired me building this plugin.

Copyright

Copyright (c) 2014 Robert Fleischmann, contributors. Released under the MIT, GPL licenses