361 lines
8.9 KiB
JavaScript
361 lines
8.9 KiB
JavaScript
|
/**!
|
||
|
|
* easyPieChart
|
||
|
|
* Lightweight plugin to render simple, animated and retina optimized pie charts
|
||
|
|
*
|
||
|
|
* @license
|
||
|
|
* @author Robert Fleischmann <rendro87@gmail.com> (http://robert-fleischmann.de)
|
||
|
|
* @version 2.1.6
|
||
|
|
**/
|
||
|
|
|
||
|
|
(function(root, factory) {
|
||
|
|
if(typeof exports === 'object') {
|
||
|
|
module.exports = factory(require('jquery'));
|
||
|
|
}
|
||
|
|
else if(typeof define === 'function' && define.amd) {
|
||
|
|
define(['jquery'], factory);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
factory(root.jQuery);
|
||
|
|
}
|
||
|
|
}(this, function($) {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Renderer to render the chart on a canvas object
|
||
|
|
* @param {DOMElement} el DOM element to host the canvas (root of the plugin)
|
||
|
|
* @param {object} options options object of the plugin
|
||
|
|
*/
|
||
|
|
var CanvasRenderer = function(el, options) {
|
||
|
|
var cachedBackground;
|
||
|
|
var canvas = document.createElement('canvas');
|
||
|
|
|
||
|
|
el.appendChild(canvas);
|
||
|
|
|
||
|
|
if (typeof(G_vmlCanvasManager) !== 'undefined') {
|
||
|
|
G_vmlCanvasManager.initElement(canvas);
|
||
|
|
}
|
||
|
|
|
||
|
|
var ctx = canvas.getContext('2d');
|
||
|
|
|
||
|
|
canvas.width = canvas.height = options.size;
|
||
|
|
|
||
|
|
// canvas on retina devices
|
||
|
|
var scaleBy = 1;
|
||
|
|
if (window.devicePixelRatio > 1) {
|
||
|
|
scaleBy = window.devicePixelRatio;
|
||
|
|
canvas.style.width = canvas.style.height = [options.size, 'px'].join('');
|
||
|
|
canvas.width = canvas.height = options.size * scaleBy;
|
||
|
|
ctx.scale(scaleBy, scaleBy);
|
||
|
|
}
|
||
|
|
|
||
|
|
// move 0,0 coordinates to the center
|
||
|
|
ctx.translate(options.size / 2, options.size / 2);
|
||
|
|
|
||
|
|
// rotate canvas -90deg
|
||
|
|
ctx.rotate((-1 / 2 + options.rotate / 180) * Math.PI);
|
||
|
|
|
||
|
|
var radius = (options.size - options.lineWidth) / 2;
|
||
|
|
if (options.scaleColor && options.scaleLength) {
|
||
|
|
radius -= options.scaleLength + 2; // 2 is the distance between scale and bar
|
||
|
|
}
|
||
|
|
|
||
|
|
// IE polyfill for Date
|
||
|
|
Date.now = Date.now || function() {
|
||
|
|
return +(new Date());
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Draw a circle around the center of the canvas
|
||
|
|
* @param {strong} color Valid CSS color string
|
||
|
|
* @param {number} lineWidth Width of the line in px
|
||
|
|
* @param {number} percent Percentage to draw (float between -1 and 1)
|
||
|
|
*/
|
||
|
|
var drawCircle = function(color, lineWidth, percent) {
|
||
|
|
percent = Math.min(Math.max(-1, percent || 0), 1);
|
||
|
|
var isNegative = percent <= 0 ? true : false;
|
||
|
|
|
||
|
|
ctx.beginPath();
|
||
|
|
ctx.arc(0, 0, radius, 0, Math.PI * 2 * percent, isNegative);
|
||
|
|
|
||
|
|
ctx.strokeStyle = color;
|
||
|
|
ctx.lineWidth = lineWidth;
|
||
|
|
|
||
|
|
ctx.stroke();
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Draw the scale of the chart
|
||
|
|
*/
|
||
|
|
var drawScale = function() {
|
||
|
|
var offset;
|
||
|
|
var length;
|
||
|
|
|
||
|
|
ctx.lineWidth = 1;
|
||
|
|
ctx.fillStyle = options.scaleColor;
|
||
|
|
|
||
|
|
ctx.save();
|
||
|
|
for (var i = 24; i > 0; --i) {
|
||
|
|
if (i % 6 === 0) {
|
||
|
|
length = options.scaleLength;
|
||
|
|
offset = 0;
|
||
|
|
} else {
|
||
|
|
length = options.scaleLength * 0.6;
|
||
|
|
offset = options.scaleLength - length;
|
||
|
|
}
|
||
|
|
ctx.fillRect(-options.size/2 + offset, 0, length, 1);
|
||
|
|
ctx.rotate(Math.PI / 12);
|
||
|
|
}
|
||
|
|
ctx.restore();
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Request animation frame wrapper with polyfill
|
||
|
|
* @return {function} Request animation frame method or timeout fallback
|
||
|
|
*/
|
||
|
|
var reqAnimationFrame = (function() {
|
||
|
|
return window.requestAnimationFrame ||
|
||
|
|
window.webkitRequestAnimationFrame ||
|
||
|
|
window.mozRequestAnimationFrame ||
|
||
|
|
function(callback) {
|
||
|
|
window.setTimeout(callback, 1000 / 60);
|
||
|
|
};
|
||
|
|
}());
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Draw the background of the plugin including the scale and the track
|
||
|
|
*/
|
||
|
|
var drawBackground = function() {
|
||
|
|
if(options.scaleColor) drawScale();
|
||
|
|
if(options.trackColor) drawCircle(options.trackColor, options.trackWidth || options.lineWidth, 1);
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Canvas accessor
|
||
|
|
*/
|
||
|
|
this.getCanvas = function() {
|
||
|
|
return canvas;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Canvas 2D context 'ctx' accessor
|
||
|
|
*/
|
||
|
|
this.getCtx = function() {
|
||
|
|
return ctx;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Clear the complete canvas
|
||
|
|
*/
|
||
|
|
this.clear = function() {
|
||
|
|
ctx.clearRect(options.size / -2, options.size / -2, options.size, options.size);
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Draw the complete chart
|
||
|
|
* @param {number} percent Percent shown by the chart between -100 and 100
|
||
|
|
*/
|
||
|
|
this.draw = function(percent) {
|
||
|
|
// do we need to render a background
|
||
|
|
if (!!options.scaleColor || !!options.trackColor) {
|
||
|
|
// getImageData and putImageData are supported
|
||
|
|
if (ctx.getImageData && ctx.putImageData) {
|
||
|
|
if (!cachedBackground) {
|
||
|
|
drawBackground();
|
||
|
|
cachedBackground = ctx.getImageData(0, 0, options.size * scaleBy, options.size * scaleBy);
|
||
|
|
} else {
|
||
|
|
ctx.putImageData(cachedBackground, 0, 0);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
this.clear();
|
||
|
|
drawBackground();
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
this.clear();
|
||
|
|
}
|
||
|
|
|
||
|
|
ctx.lineCap = options.lineCap;
|
||
|
|
|
||
|
|
// if barcolor is a function execute it and pass the percent as a value
|
||
|
|
var color;
|
||
|
|
if (typeof(options.barColor) === 'function') {
|
||
|
|
color = options.barColor(percent);
|
||
|
|
} else {
|
||
|
|
color = options.barColor;
|
||
|
|
}
|
||
|
|
|
||
|
|
// draw bar
|
||
|
|
drawCircle(color, options.lineWidth, percent / 100);
|
||
|
|
}.bind(this);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Animate from some percent to some other percentage
|
||
|
|
* @param {number} from Starting percentage
|
||
|
|
* @param {number} to Final percentage
|
||
|
|
*/
|
||
|
|
this.animate = function(from, to) {
|
||
|
|
var startTime = Date.now();
|
||
|
|
options.onStart(from, to);
|
||
|
|
var animation = function() {
|
||
|
|
var process = Math.min(Date.now() - startTime, options.animate.duration);
|
||
|
|
var currentValue = options.easing(this, process, from, to - from, options.animate.duration);
|
||
|
|
this.draw(currentValue);
|
||
|
|
options.onStep(from, to, currentValue);
|
||
|
|
if (process >= options.animate.duration) {
|
||
|
|
options.onStop(from, to);
|
||
|
|
} else {
|
||
|
|
reqAnimationFrame(animation);
|
||
|
|
}
|
||
|
|
}.bind(this);
|
||
|
|
|
||
|
|
reqAnimationFrame(animation);
|
||
|
|
}.bind(this);
|
||
|
|
};
|
||
|
|
|
||
|
|
var EasyPieChart = function(el, opts) {
|
||
|
|
var defaultOptions = {
|
||
|
|
barColor: '#ef1e25',
|
||
|
|
trackColor: '#f9f9f9',
|
||
|
|
scaleColor: '#dfe0e0',
|
||
|
|
scaleLength: 5,
|
||
|
|
lineCap: 'round',
|
||
|
|
lineWidth: 3,
|
||
|
|
trackWidth: undefined,
|
||
|
|
size: 110,
|
||
|
|
rotate: 0,
|
||
|
|
animate: {
|
||
|
|
duration: 1000,
|
||
|
|
enabled: true
|
||
|
|
},
|
||
|
|
easing: function (x, t, b, c, d) { // more can be found here: http://gsgd.co.uk/sandbox/jquery/easing/
|
||
|
|
t = t / (d/2);
|
||
|
|
if (t < 1) {
|
||
|
|
return c / 2 * t * t + b;
|
||
|
|
}
|
||
|
|
return -c/2 * ((--t)*(t-2) - 1) + b;
|
||
|
|
},
|
||
|
|
onStart: function(from, to) {
|
||
|
|
return;
|
||
|
|
},
|
||
|
|
onStep: function(from, to, currentValue) {
|
||
|
|
return;
|
||
|
|
},
|
||
|
|
onStop: function(from, to) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
// detect present renderer
|
||
|
|
if (typeof(CanvasRenderer) !== 'undefined') {
|
||
|
|
defaultOptions.renderer = CanvasRenderer;
|
||
|
|
} else if (typeof(SVGRenderer) !== 'undefined') {
|
||
|
|
defaultOptions.renderer = SVGRenderer;
|
||
|
|
} else {
|
||
|
|
throw new Error('Please load either the SVG- or the CanvasRenderer');
|
||
|
|
}
|
||
|
|
|
||
|
|
var options = {};
|
||
|
|
var currentValue = 0;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Initialize the plugin by creating the options object and initialize rendering
|
||
|
|
*/
|
||
|
|
var init = function() {
|
||
|
|
this.el = el;
|
||
|
|
this.options = options;
|
||
|
|
|
||
|
|
// merge user options into default options
|
||
|
|
for (var i in defaultOptions) {
|
||
|
|
if (defaultOptions.hasOwnProperty(i)) {
|
||
|
|
options[i] = opts && typeof(opts[i]) !== 'undefined' ? opts[i] : defaultOptions[i];
|
||
|
|
if (typeof(options[i]) === 'function') {
|
||
|
|
options[i] = options[i].bind(this);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// check for jQuery easing
|
||
|
|
if (typeof(options.easing) === 'string' && typeof(jQuery) !== 'undefined' && jQuery.isFunction(jQuery.easing[options.easing])) {
|
||
|
|
options.easing = jQuery.easing[options.easing];
|
||
|
|
} else {
|
||
|
|
options.easing = defaultOptions.easing;
|
||
|
|
}
|
||
|
|
|
||
|
|
// process earlier animate option to avoid bc breaks
|
||
|
|
if (typeof(options.animate) === 'number') {
|
||
|
|
options.animate = {
|
||
|
|
duration: options.animate,
|
||
|
|
enabled: true
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
if (typeof(options.animate) === 'boolean' && !options.animate) {
|
||
|
|
options.animate = {
|
||
|
|
duration: 1000,
|
||
|
|
enabled: options.animate
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// create renderer
|
||
|
|
this.renderer = new options.renderer(el, options);
|
||
|
|
|
||
|
|
// initial draw
|
||
|
|
this.renderer.draw(currentValue);
|
||
|
|
|
||
|
|
// initial update
|
||
|
|
if (el.dataset && el.dataset.percent) {
|
||
|
|
this.update(parseFloat(el.dataset.percent));
|
||
|
|
} else if (el.getAttribute && el.getAttribute('data-percent')) {
|
||
|
|
this.update(parseFloat(el.getAttribute('data-percent')));
|
||
|
|
}
|
||
|
|
}.bind(this);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Update the value of the chart
|
||
|
|
* @param {number} newValue Number between 0 and 100
|
||
|
|
* @return {object} Instance of the plugin for method chaining
|
||
|
|
*/
|
||
|
|
this.update = function(newValue) {
|
||
|
|
newValue = parseFloat(newValue);
|
||
|
|
if (options.animate.enabled) {
|
||
|
|
this.renderer.animate(currentValue, newValue);
|
||
|
|
} else {
|
||
|
|
this.renderer.draw(newValue);
|
||
|
|
}
|
||
|
|
currentValue = newValue;
|
||
|
|
return this;
|
||
|
|
}.bind(this);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Disable animation
|
||
|
|
* @return {object} Instance of the plugin for method chaining
|
||
|
|
*/
|
||
|
|
this.disableAnimation = function() {
|
||
|
|
options.animate.enabled = false;
|
||
|
|
return this;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Enable animation
|
||
|
|
* @return {object} Instance of the plugin for method chaining
|
||
|
|
*/
|
||
|
|
this.enableAnimation = function() {
|
||
|
|
options.animate.enabled = true;
|
||
|
|
return this;
|
||
|
|
};
|
||
|
|
|
||
|
|
init();
|
||
|
|
};
|
||
|
|
|
||
|
|
$.fn.easyPieChart = function(options) {
|
||
|
|
return this.each(function() {
|
||
|
|
var instanceOptions;
|
||
|
|
|
||
|
|
if (!$.data(this, 'easyPieChart')) {
|
||
|
|
instanceOptions = $.extend({}, options, $(this).data());
|
||
|
|
$.data(this, 'easyPieChart', new EasyPieChart(this, instanceOptions));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
}));
|