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/**
* jquery-circle-progress - jQuery Plugin to draw animated circular progress bars:
* {@link http://kottenator.github.io/jquery-circle-progress/}
*
* @author Rostyslav Bryzgunov <kottenator@gmail.com>
* @version 1.2.2
* @licence MIT
* @preserve
*/
// UMD factory - https://github.com/umdjs/umd/blob/d31bb6ee7098715e019f52bdfe27b3e4bfd2b97e/templates/jqueryPlugin.js
// Uses AMD, CommonJS or browser globals to create a jQuery plugin.
(function(factory) {
if (typeof define === 'function' && define.amd) {
// AMD - register as an anonymous module
define(['jquery'], factory);
} else if (typeof module === 'object' && module.exports) {
// Node/CommonJS
var $ = require('jquery');
factory($);
module.exports = $;
} else {
// Browser globals
factory(jQuery);
}
})(function($) {
/**
* Inner implementation of the circle progress bar.
* The class is not exposed _yet_ but you can create an instance through jQuery method call.
*
* @param {object} config - You can customize any class member (property or method).
* @class
* @alias CircleProgress
*/
function CircleProgress(config) {
this.init(config);
}
CircleProgress.prototype = {
//--------------------------------------- public options ---------------------------------------
/**
* This is the only required option. It should be from `0.0` to `1.0`.
* @type {number}
* @default 0.0
*/
value: 0.0,
/**
* Size of the canvas in pixels.
* It's a square so we need only one dimension.
* @type {number}
* @default 100.0
*/
size: 100.0,
/**
* Initial angle for `0.0` value in radians.
* @type {number}
* @default -Math.PI
*/
startAngle: -Math.PI,
/**
* Width of the arc in pixels.
* If it's `'auto'` - the value is calculated as `[this.size]{@link CircleProgress#size} / 14`.
* @type {number|string}
* @default 'auto'
*/
thickness: 'auto',
/**
* Fill of the arc. You may set it to:
*
* - solid color:
* - `'#3aeabb'`
* - `{ color: '#3aeabb' }`
* - `{ color: 'rgba(255, 255, 255, .3)' }`
* - linear gradient _(left to right)_:
* - `{ gradient: ['#3aeabb', '#fdd250'], gradientAngle: Math.PI / 4 }`
* - `{ gradient: ['red', 'green', 'blue'], gradientDirection: [x0, y0, x1, y1] }`
* - `{ gradient: [["red", .2], ["green", .3], ["blue", .8]] }`
* - image:
* - `{ image: 'http://i.imgur.com/pT0i89v.png' }`
* - `{ image: imageObject }`
* - `{ color: 'lime', image: 'http://i.imgur.com/pT0i89v.png' }` -
* color displayed until the image is loaded
*
* @default {gradient: ['#3aeabb', '#fdd250']}
*/
fill: {
gradient: ['#59acff', '#b6cf01']
},
/**
* Color of the "empty" arc. Only a color fill supported by now.
* @type {string}
* @default 'rgba(0, 0, 0, .1)'
*/
emptyFill: 'rgba(0, 0, 0, .1)',
/**
* jQuery Animation config.
* You can pass `false` to disable the animation.
* @see http://api.jquery.com/animate/
* @type {object|boolean}
* @default {duration: 1200, easing: 'circleProgressEasing'}
*/
animation: {
duration: 1200,
easing: 'circleProgressEasing'
},
/**
* Default animation starts at `0.0` and ends at specified `value`. Let's call this _direct animation_.
* If you want to make _reversed animation_ - set `animationStartValue: 1.0`.
* Also you may specify any other value from `0.0` to `1.0`.
* @type {number}
* @default 0.0
*/
animationStartValue: 0.0,
/**
* Reverse animation and arc draw.
* By default, the arc is filled from `0.0` to `value`, _clockwise_.
* With `reverse: true` the arc is filled from `1.0` to `value`, _counter-clockwise_.
* @type {boolean}
* @default false
*/
reverse: false,
/**
* Arc line cap: `'butt'`, `'round'` or `'square'` -
* [read more]{@link https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D.lineCap}.
* @type {string}
* @default 'butt'
*/
lineCap: 'butt',
/**
* Canvas insertion mode: append or prepend it into the parent element?
* @type {string}
* @default 'prepend'
*/
insertMode: 'prepend',
//------------------------------ protected properties and methods ------------------------------
/**
* Link to {@link CircleProgress} constructor.
* @protected
*/
constructor: CircleProgress,
/**
* Container element. Should be passed into constructor config.
* @protected
* @type {jQuery}
*/
el: null,
/**
* Canvas element. Automatically generated and prepended to [this.el]{@link CircleProgress#el}.
* @protected
* @type {HTMLCanvasElement}
*/
canvas: null,
/**
* 2D-context of [this.canvas]{@link CircleProgress#canvas}.
* @protected
* @type {CanvasRenderingContext2D}
*/
ctx: null,
/**
* Radius of the outer circle. Automatically calculated as `[this.size]{@link CircleProgress#size} / 2`.
* @protected
* @type {number}
*/
radius: 0.0,
/**
* Fill of the main arc. Automatically calculated, depending on [this.fill]{@link CircleProgress#fill} option.
* @protected
* @type {string|CanvasGradient|CanvasPattern}
*/
arcFill: null,
/**
* Last rendered frame value.
* @protected
* @type {number}
*/
lastFrameValue: 0.0,
/**
* Init/re-init the widget.
*
* Throws a jQuery event:
*
* - `circle-inited(jqEvent)`
*
* @param {object} config - You can customize any class member (property or method).
*/
init: function(config) {
$.extend(this, config);
this.radius = this.size / 2;
this.initWidget();
this.initFill();
this.draw();
this.el.trigger('circle-inited');
},
/**
* Initialize `<canvas>`.
* @protected
*/
initWidget: function() {
if (!this.canvas)
this.canvas = $('<canvas>')[this.insertMode == 'prepend' ? 'prependTo' : 'appendTo'](this.el)[0];
var canvas = this.canvas;
canvas.width = this.size;
canvas.height = this.size;
this.ctx = canvas.getContext('2d');
if (window.devicePixelRatio > 1) {
var scaleBy = window.devicePixelRatio;
canvas.style.width = canvas.style.height = this.size + 'px';
canvas.width = canvas.height = this.size * scaleBy;
this.ctx.scale(scaleBy, scaleBy);
}
},
/**
* This method sets [this.arcFill]{@link CircleProgress#arcFill}.
* It could do this async (on image load).
* @protected
*/
initFill: function() {
var self = this,
fill = this.fill,
ctx = this.ctx,
size = this.size;
if (!fill)
throw Error("The fill is not specified!");
if (typeof fill == 'string')
fill = {color: fill};
if (fill.color)
this.arcFill = fill.color;
if (fill.gradient) {
var gr = fill.gradient;
if (gr.length == 1) {
this.arcFill = gr[0];
} else if (gr.length > 1) {
var ga = fill.gradientAngle || 0, // gradient direction angle; 0 by default
gd = fill.gradientDirection || [
size / 2 * (1 - Math.cos(ga)), // x0
size / 2 * (1 + Math.sin(ga)), // y0
size / 2 * (1 + Math.cos(ga)), // x1
size / 2 * (1 - Math.sin(ga)) // y1
];
var lg = ctx.createLinearGradient.apply(ctx, gd);
for (var i = 0; i < gr.length; i++) {
var color = gr[i],
pos = i / (gr.length - 1);
if ($.isArray(color)) {
pos = color[1];
color = color[0];
}
lg.addColorStop(pos, color);
}
this.arcFill = lg;
}
}
if (fill.image) {
var img;
if (fill.image instanceof Image) {
img = fill.image;
} else {
img = new Image();
img.src = fill.image;
}
if (img.complete)
setImageFill();
else
img.onload = setImageFill;
}
function setImageFill() {
var bg = $('<canvas>')[0];
bg.width = self.size;
bg.height = self.size;
bg.getContext('2d').drawImage(img, 0, 0, size, size);
self.arcFill = self.ctx.createPattern(bg, 'no-repeat');
self.drawFrame(self.lastFrameValue);
}
},
/**
* Draw the circle.
* @protected
*/
draw: function() {
if (this.animation)
this.drawAnimated(this.value);
else
this.drawFrame(this.value);
},
/**
* Draw a single animation frame.
* @protected
* @param {number} v - Frame value.
*/
drawFrame: function(v) {
this.lastFrameValue = v;
this.ctx.clearRect(0, 0, this.size, this.size);
this.drawEmptyArc(v);
this.drawArc(v);
},
/**
* Draw the arc (part of the circle).
* @protected
* @param {number} v - Frame value.
*/
drawArc: function(v) {
if (v === 0)
return;
var ctx = this.ctx,
r = this.radius,
t = this.getThickness(),
a = this.startAngle;
ctx.save();
ctx.beginPath();
if (!this.reverse) {
ctx.arc(r, r, r - t / 2, a, a + Math.PI * 2 * v);
} else {
ctx.arc(r, r, r - t / 2, a - Math.PI * 2 * v, a);
}
ctx.lineWidth = t;
ctx.lineCap = this.lineCap;
ctx.strokeStyle = this.arcFill;
ctx.stroke();
ctx.restore();
},
/**
* Draw the _empty (background)_ arc (part of the circle).
* @protected
* @param {number} v - Frame value.
*/
drawEmptyArc: function(v) {
var ctx = this.ctx,
r = this.radius,
t = this.getThickness(),
a = this.startAngle;
if (v < 1) {
ctx.save();
ctx.beginPath();
if (v <= 0) {
ctx.arc(r, r, r - t / 2, 0, Math.PI * 2);
} else {
if (!this.reverse) {
ctx.arc(r, r, r - t / 2, a + Math.PI * 2 * v, a);
} else {
ctx.arc(r, r, r - t / 2, a, a - Math.PI * 2 * v);
}
}
ctx.lineWidth = t;
ctx.strokeStyle = this.emptyFill;
ctx.stroke();
ctx.restore();
}
},
/**
* Animate the progress bar.
*
* Throws 3 jQuery events:
*
* - `circle-animation-start(jqEvent)`
* - `circle-animation-progress(jqEvent, animationProgress, stepValue)` - multiple event
* animationProgress: from `0.0` to `1.0`; stepValue: from `0.0` to `value`
* - `circle-animation-end(jqEvent)`
*
* @protected
* @param {number} v - Final value.
*/
drawAnimated: function(v) {
var self = this,
el = this.el,
canvas = $(this.canvas);
// stop previous animation before new "start" event is triggered
canvas.stop(true, false);
el.trigger('circle-animation-start');
canvas
.css({animationProgress: 0})
.animate({animationProgress: 1}, $.extend({}, this.animation, {
step: function(animationProgress) {
var stepValue = self.animationStartValue * (1 - animationProgress) + v * animationProgress;
self.drawFrame(stepValue);
el.trigger('circle-animation-progress', [animationProgress, stepValue]);
}
}))
.promise()
.always(function() {
// trigger on both successful & failure animation end
el.trigger('circle-animation-end');
});
},
/**
* Get the circle thickness.
* @see CircleProgress#thickness
* @protected
* @returns {number}
*/
getThickness: function() {
return $.isNumeric(this.thickness) ? this.thickness : this.size / 14;
},
/**
* Get current value.
* @protected
* @return {number}
*/
getValue: function() {
return this.value;
},
/**
* Set current value (with smooth animation transition).
* @protected
* @param {number} newValue
*/
setValue: function(newValue) {
if (this.animation)
this.animationStartValue = this.lastFrameValue;
this.value = newValue;
this.draw();
}
};
//----------------------------------- Initiating jQuery plugin -----------------------------------
$.circleProgress = {
// Default options (you may override them)
defaults: CircleProgress.prototype
};
// ease-in-out-cubic
$.easing.circleProgressEasing = function(x) {
if (x < 0.5) {
x = 2 * x;
return 0.5 * x * x * x;
} else {
x = 2 - 2 * x;
return 1 - 0.5 * x * x * x;
}
};
/**
* Creates an instance of {@link CircleProgress}.
* Produces [init event]{@link CircleProgress#init} and [animation events]{@link CircleProgress#drawAnimated}.
*
* @param {object} [configOrCommand] - Config object or command name.
*
* Config example (you can specify any {@link CircleProgress} property):
*
* ```js
* { value: 0.75, size: 50, animation: false }
* ```
*
* Commands:
*
* ```js
* el.circleProgress('widget'); // get the <canvas>
* el.circleProgress('value'); // get the value
* el.circleProgress('value', newValue); // update the value
* el.circleProgress('redraw'); // redraw the circle
* el.circleProgress(); // the same as 'redraw'
* ```
*
* @param {string} [commandArgument] - Some commands (like `'value'`) may require an argument.
* @see CircleProgress
* @alias "$(...).circleProgress"
*/
$.fn.circleProgress = function(configOrCommand, commandArgument) {
var dataName = 'circle-progress',
firstInstance = this.data(dataName);
if (configOrCommand == 'widget') {
if (!firstInstance)
throw Error('Calling "widget" method on not initialized instance is forbidden');
return firstInstance.canvas;
}
if (configOrCommand == 'value') {
if (!firstInstance)
throw Error('Calling "value" method on not initialized instance is forbidden');
if (typeof commandArgument == 'undefined') {
return firstInstance.getValue();
} else {
var newValue = arguments[1];
return this.each(function() {
$(this).data(dataName).setValue(newValue);
});
}
}
return this.each(function() {
var el = $(this),
instance = el.data(dataName),
config = $.isPlainObject(configOrCommand) ? configOrCommand : {};
if (instance) {
instance.init(config);
} else {
var initialConfig = $.extend({}, el.data());
if (typeof initialConfig.fill == 'string')
initialConfig.fill = JSON.parse(initialConfig.fill);
if (typeof initialConfig.animation == 'string')
initialConfig.animation = JSON.parse(initialConfig.animation);
config = $.extend(initialConfig, config);
config.el = el;
instance = new CircleProgress(config);
el.data(dataName, instance);
}
});
};
});