circle.js
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// var $ = require('jquery');
// require(['jquery'], function($){
var Circle = {
initialize: function() {
this.render();
},
render: function() {
var _this = this;
$('span[data-circle]').each(function() {
var c = new _circle($(this));
c.initialize();
});
}
};
function _circle(selector) {
// var opt = {
// countdown: $.trim(selector.attr('data-circle')) == 'countdown',
// min: +$.trim(selector.attr('data-min')),
// max: +$.trim(selector.attr('data-max')),
// init: +$.trim(selector.attr('data-init')),
// r: +$.trim(selector.attr('data-r')),
// lineWidth: +$.trim(selector.attr('data-lineWidth')),
// hColor: $.trim(selector.attr('data-hColor')),
// percent: $.trim(selector.attr('data-percent')),
// };
var opt = selector.data();
console.log(opt);
var defaults = {
countdown: false,
min: 0,
r: 45, //半径
linewidth: 6,
color: '#e2e2e2',
fontsize: 26,
hcolor: '#69b8dc',
max: 100,
init: 0,
current: 0,
percent: 0
};
this.selector = selector;
this.settings = $.extend(true, defaults, opt);
this.settings.current = this.settings.init;
this.settings.countdown = this.settings.circle > 0 ? true: false;
}
_circle.prototype = {
initialize: function() {
var canvas = document.createElement('canvas');
canvas.setAttribute('width', this.settings.r * 2);
canvas.setAttribute('height', this.settings.r * 2);
var ctx = canvas.getContext('2d');
this.canvas = canvas;
this.show();
this.ctx = ctx;
var _this = this;
if (this.settings.countdown) {
this.timer = setInterval(function() {
_this.countdown();
}, 1000);
}
this.bindEvents();
this.render();
},
bindEvents: function(){
var _this = this;
if(this.settings.input){
$(_this.settings.input).on('input', function(e){
var number = $.trim($(this).val());
number = number.replace(/^\.*$/, '');
number = number.replace(/[^0-9\.]/g, '');
number = number.replace(/(([1-9]\d*(\.\d{0,2})?)|0(\.\d{0,2})?).*/, "$1");
if(+number > _this.settings.max){
number = _this.settings.max;
}
$(this).val(number);
_this.settings.current = +number;
_this.render();
});
}
},
show: function() {
this.selector.append(this.canvas);
},
render: function() {
this.update();
},
countdown: function() {
if (this.settings.current <= 0) {
clearInterval(this.timer);
this.selector.trigger('circleFinish');
return;
}
this.settings.current -= 1;
this.render();
},
update: function() {
var ctx = this.ctx;
ctx.clearRect(0, 0, this.settings.r * 2, this.settings.r * 2);
ctx.beginPath();
ctx.strokeStyle = this.settings.color;
ctx.lineWidth = this.settings.linewidth;
ctx.arc(this.settings.r, this.settings.r, this.settings.r - this.settings.linewidth, 0, Math.PI * 2, true);
ctx.stroke();
// 设置字体
ctx.font = "normal "+ this.settings.fontsize+"px Arial";
// 设置对齐方式
ctx.textAlign = "center";
// 设置填充颜色
ctx.fillStyle = this.settings.hcolor;
var text = Math.floor(this.settings.current * 100 / this.settings.max);
var y = this.settings.r + 11;
if(this.settings.percent > 0){
text += '%';
y = this.settings.r + 7;
}
// 设置字体内容，以及在画布上的位置
ctx.fillText(text, this.settings.r, y);
// 绘制空心字
// ctx.strokeText(this.settings.init, this.settings.r, this.settings.r + 8);
var ctx = this.ctx;
ctx.beginPath();
ctx.strokeStyle = this.settings.hcolor;
var end = -this.settings.current / this.settings.max * Math.PI * 2 - Math.PI / 180 * 90;
ctx.arc(this.settings.r, this.settings.r, this.settings.r - this.settings.linewidth, -Math.PI / 180 * 90, end, true);
ctx.stroke();
}
};
// component
if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
// AMD. Register as an anonymous module.
define(function() {
return Circle;
});
} else if (typeof module !== 'undefined' && module.exports) {
module.exports = Circle;
} else {
window.Circle = Circle;
}