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360 lines
12 KiB
JavaScript
360 lines
12 KiB
JavaScript
1 year ago
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/**!
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* easyPieChart
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* Lightweight plugin to render simple, animated and retina optimized pie charts
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*
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* @license
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* @author Robert Fleischmann <rendro87@gmail.com> (http://robert-fleischmann.de)
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* @version 2.1.5
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**/
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(function(root, factory) {
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if(typeof exports === 'object') {
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module.exports = factory(require('jquery'));
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}
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else if(typeof define === 'function' && define.amd) {
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define(['jquery'], factory);
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}
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else {
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factory(root.jQuery);
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}
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}(this, function($) {
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/**
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* Renderer to render the chart on a canvas object
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* @param {DOMElement} el DOM element to host the canvas (root of the plugin)
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* @param {object} options options object of the plugin
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*/
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var CanvasRenderer = function(el, options) {
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var cachedBackground;
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var canvas = document.createElement('canvas');
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el.appendChild(canvas);
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if (typeof(G_vmlCanvasManager) !== 'undefined') {
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G_vmlCanvasManager.initElement(canvas);
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}
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var ctx = canvas.getContext('2d');
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canvas.width = canvas.height = options.size;
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// canvas on retina devices
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var scaleBy = 1;
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if (window.devicePixelRatio > 1) {
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scaleBy = window.devicePixelRatio;
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canvas.style.width = canvas.style.height = [options.size, 'px'].join('');
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canvas.width = canvas.height = options.size * scaleBy;
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ctx.scale(scaleBy, scaleBy);
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}
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// move 0,0 coordinates to the center
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ctx.translate(options.size / 2, options.size / 2);
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// rotate canvas -90deg
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ctx.rotate((-1 / 2 + options.rotate / 180) * Math.PI);
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var radius = (options.size - options.lineWidth) / 2;
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if (options.scaleColor && options.scaleLength) {
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radius -= options.scaleLength + 2; // 2 is the distance between scale and bar
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}
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// IE polyfill for Date
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Date.now = Date.now || function() {
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return +(new Date());
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};
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/**
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* Draw a circle around the center of the canvas
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* @param {strong} color Valid CSS color string
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* @param {number} lineWidth Width of the line in px
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* @param {number} percent Percentage to draw (float between -1 and 1)
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*/
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var drawCircle = function(color, lineWidth, percent) {
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percent = Math.min(Math.max(-1, percent || 0), 1);
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var isNegative = percent <= 0 ? true : false;
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ctx.beginPath();
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ctx.arc(0, 0, radius, 0, Math.PI * 2 * percent, isNegative);
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ctx.strokeStyle = color;
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ctx.lineWidth = lineWidth;
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ctx.stroke();
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};
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/**
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* Draw the scale of the chart
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*/
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var drawScale = function() {
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var offset;
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var length;
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ctx.lineWidth = 1;
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ctx.fillStyle = options.scaleColor;
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ctx.save();
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for (var i = 24; i > 0; --i) {
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if (i % 6 === 0) {
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length = options.scaleLength;
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offset = 0;
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} else {
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length = options.scaleLength * 0.6;
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offset = options.scaleLength - length;
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}
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ctx.fillRect(-options.size/2 + offset, 0, length, 1);
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ctx.rotate(Math.PI / 12);
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}
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ctx.restore();
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};
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/**
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* Request animation frame wrapper with polyfill
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* @return {function} Request animation frame method or timeout fallback
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*/
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var reqAnimationFrame = (function() {
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return window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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function(callback) {
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window.setTimeout(callback, 1000 / 60);
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};
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}());
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/**
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* Draw the background of the plugin including the scale and the track
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*/
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var drawBackground = function() {
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if(options.scaleColor) drawScale();
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if(options.trackColor) drawCircle(options.trackColor, options.lineWidth, 1);
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};
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/**
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* Canvas accessor
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*/
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this.getCanvas = function() {
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return canvas;
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};
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/**
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* Canvas 2D context 'ctx' accessor
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*/
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this.getCtx = function() {
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return ctx;
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};
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/**
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* Clear the complete canvas
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*/
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this.clear = function() {
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ctx.clearRect(options.size / -2, options.size / -2, options.size, options.size);
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};
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/**
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* Draw the complete chart
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* @param {number} percent Percent shown by the chart between -100 and 100
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*/
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this.draw = function(percent) {
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// do we need to render a background
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if (!!options.scaleColor || !!options.trackColor) {
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// getImageData and putImageData are supported
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if (ctx.getImageData && ctx.putImageData) {
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if (!cachedBackground) {
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drawBackground();
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cachedBackground = ctx.getImageData(0, 0, options.size * scaleBy, options.size * scaleBy);
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} else {
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ctx.putImageData(cachedBackground, 0, 0);
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}
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} else {
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this.clear();
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drawBackground();
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}
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} else {
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this.clear();
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}
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ctx.lineCap = options.lineCap;
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// if barcolor is a function execute it and pass the percent as a value
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var color;
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if (typeof(options.barColor) === 'function') {
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color = options.barColor(percent);
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} else {
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color = options.barColor;
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}
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// draw bar
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drawCircle(color, options.lineWidth, percent / 100);
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}.bind(this);
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/**
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* Animate from some percent to some other percentage
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* @param {number} from Starting percentage
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* @param {number} to Final percentage
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*/
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this.animate = function(from, to) {
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var startTime = Date.now();
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options.onStart(from, to);
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var animation = function() {
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var process = Math.min(Date.now() - startTime, options.animate.duration);
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var currentValue = options.easing(this, process, from, to - from, options.animate.duration);
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this.draw(currentValue);
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options.onStep(from, to, currentValue);
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if (process >= options.animate.duration) {
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options.onStop(from, to);
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} else {
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reqAnimationFrame(animation);
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}
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}.bind(this);
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reqAnimationFrame(animation);
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}.bind(this);
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};
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var EasyPieChart = function(el, opts) {
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var defaultOptions = {
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barColor: '#ef1e25',
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trackColor: '#f9f9f9',
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scaleColor: '#dfe0e0',
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scaleLength: 5,
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lineCap: 'round',
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lineWidth: 3,
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size: 110,
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rotate: 0,
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animate: {
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duration: 1000,
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enabled: true
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},
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easing: function (x, t, b, c, d) { // more can be found here: http://gsgd.co.uk/sandbox/jquery/easing/
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t = t / (d/2);
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if (t < 1) {
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return c / 2 * t * t + b;
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}
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return -c/2 * ((--t)*(t-2) - 1) + b;
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},
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onStart: function(from, to) {
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return;
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},
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onStep: function(from, to, currentValue) {
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return;
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},
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onStop: function(from, to) {
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return;
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}
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};
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// detect present renderer
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if (typeof(CanvasRenderer) !== 'undefined') {
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defaultOptions.renderer = CanvasRenderer;
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} else if (typeof(SVGRenderer) !== 'undefined') {
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defaultOptions.renderer = SVGRenderer;
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} else {
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throw new Error('Please load either the SVG- or the CanvasRenderer');
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}
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var options = {};
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var currentValue = 0;
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/**
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* Initialize the plugin by creating the options object and initialize rendering
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*/
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var init = function() {
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this.el = el;
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this.options = options;
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// merge user options into default options
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for (var i in defaultOptions) {
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if (defaultOptions.hasOwnProperty(i)) {
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options[i] = opts && typeof(opts[i]) !== 'undefined' ? opts[i] : defaultOptions[i];
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if (typeof(options[i]) === 'function') {
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options[i] = options[i].bind(this);
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}
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}
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}
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// check for jQuery easing
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if (typeof(options.easing) === 'string' && typeof(jQuery) !== 'undefined' && jQuery.isFunction(jQuery.easing[options.easing])) {
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options.easing = jQuery.easing[options.easing];
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} else {
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options.easing = defaultOptions.easing;
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}
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// process earlier animate option to avoid bc breaks
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if (typeof(options.animate) === 'number') {
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options.animate = {
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duration: options.animate,
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enabled: true
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};
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}
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if (typeof(options.animate) === 'boolean' && !options.animate) {
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options.animate = {
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duration: 1000,
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enabled: options.animate
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};
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}
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// create renderer
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this.renderer = new options.renderer(el, options);
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// initial draw
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this.renderer.draw(currentValue);
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// initial update
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if (el.dataset && el.dataset.percent) {
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this.update(parseFloat(el.dataset.percent));
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} else if (el.getAttribute && el.getAttribute('data-percent')) {
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this.update(parseFloat(el.getAttribute('data-percent')));
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}
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}.bind(this);
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/**
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* Update the value of the chart
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* @param {number} newValue Number between 0 and 100
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* @return {object} Instance of the plugin for method chaining
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*/
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this.update = function(newValue) {
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newValue = parseFloat(newValue);
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if (options.animate.enabled) {
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this.renderer.animate(currentValue, newValue);
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} else {
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this.renderer.draw(newValue);
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}
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currentValue = newValue;
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return this;
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}.bind(this);
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/**
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* Disable animation
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* @return {object} Instance of the plugin for method chaining
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*/
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this.disableAnimation = function() {
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options.animate.enabled = false;
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return this;
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};
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/**
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* Enable animation
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* @return {object} Instance of the plugin for method chaining
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*/
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this.enableAnimation = function() {
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options.animate.enabled = true;
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return this;
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};
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init();
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};
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$.fn.easyPieChart = function(options) {
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return this.each(function() {
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var instanceOptions;
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if (!$.data(this, 'easyPieChart')) {
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instanceOptions = $.extend({}, options, $(this).data());
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$.data(this, 'easyPieChart', new EasyPieChart(this, instanceOptions));
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}
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});
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};
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}));
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