91 lines
2.3 KiB
JavaScript
91 lines
2.3 KiB
JavaScript
/**
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* echarts数字运算相关
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*
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* @desc echarts基于Canvas，纯Javascript图表库，提供直观，生动，可交互，可个性化定制的数据统计图表。
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* @author Kener (@Kener-林峰, kener.linfeng@gmail.com)
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*
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*/
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define(function() {
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function _trim(str) {
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return str.replace(/^\s+/, '').replace(/\s+$/, '');
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}
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/**
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* 百分比计算
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*/
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function parsePercent(value, maxValue) {
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if (typeof value === 'string') {
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if (_trim(value).match(/%$/)) {
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return parseFloat(value) / 100 * maxValue;
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}
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return parseFloat(value);
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}
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return value;
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}
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/**
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* 获取中心坐标
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*/
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function parseCenter(zr, center) {
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return [
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parsePercent(center[0], zr.getWidth()),
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parsePercent(center[1], zr.getHeight())
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];
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}
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/**
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* 获取自适应半径
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*/
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function parseRadius(zr, radius) {
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// 传数组实现环形图，[内半径，外半径]，传单个则默认为外半径为
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if (!(radius instanceof Array)) {
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radius = [0, radius];
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}
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var zrSize = Math.min(zr.getWidth(), zr.getHeight()) / 2;
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return [
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parsePercent(radius[0], zrSize),
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parsePercent(radius[1], zrSize)
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];
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}
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/**
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* 每三位默认加,格式化
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*/
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function addCommas(x) {
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if (isNaN(x)) {
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return '-';
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}
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x = (x + '').split('.');
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return x[0].replace(/(\d{1,3})(?=(?:\d{3})+(?!\d))/g,'$1,')
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+ (x.length > 1 ? ('.' + x[1]) : '');
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}
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/**
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* 获取数字的小数位数
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* @param {number} val
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*/
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// It is much faster than methods converting number to string as follows
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// var tmp = val.toString();
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// return tmp.length - 1 - tmp.indexOf('.');
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// especially when precision is low
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function getPrecision(val) {
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var e = 1;
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var count = 0;
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while (Math.round(val * e) / e !== val) {
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e *= 10;
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count++;
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}
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return count;
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}
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return {
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parsePercent: parsePercent,
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parseCenter: parseCenter,
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parseRadius: parseRadius,
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addCommas: addCommas,
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getPrecision: getPrecision
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};
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}); |