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File: vendors/echarts/src/scale/Time.js

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File: vendors/echarts/src/scale/Time.js
Role: Auxiliary data
Content type: text/plain
Description: Auxiliary data
Class: Gentelella BladeOne
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Date: 3 years ago
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/** * Interval scale * @module echarts/coord/scale/Time */ define(function (require) { var zrUtil = require('zrender/core/util'); var numberUtil = require('../util/number'); var formatUtil = require('../util/format'); var IntervalScale = require('./Interval'); var intervalScaleProto = IntervalScale.prototype; var mathCeil = Math.ceil; var mathFloor = Math.floor; var ONE_SECOND = 1000; var ONE_MINUTE = ONE_SECOND * 60; var ONE_HOUR = ONE_MINUTE * 60; var ONE_DAY = ONE_HOUR * 24; // FIXME ??? var bisect = function (a, x, lo, hi) { while (lo < hi) { var mid = lo + hi >>> 1; if (a[mid][2] < x) { lo = mid + 1; } else { hi = mid; } } return lo; }; /** * @alias module:echarts/coord/scale/Time * @constructor */ var TimeScale = IntervalScale.extend({ type: 'time', // Overwrite getLabel: function (val) { var stepLvl = this._stepLvl; var date = new Date(val); return formatUtil.formatTime(stepLvl[0], date); }, // Overwrite niceExtent: function (approxTickNum, fixMin, fixMax) { var extent = this._extent; // If extent start and end are same, expand them if (extent[0] === extent[1]) { // Expand extent extent[0] -= ONE_DAY; extent[1] += ONE_DAY; } // If there are no data and extent are [Infinity, -Infinity] if (extent[1] === -Infinity && extent[0] === Infinity) { var d = new Date(); extent[1] = new Date(d.getFullYear(), d.getMonth(), d.getDate()); extent[0] = extent[1] - ONE_DAY; } this.niceTicks(approxTickNum); // var extent = this._extent; var interval = this._interval; if (!fixMin) { extent[0] = numberUtil.round(mathFloor(extent[0] / interval) * interval); } if (!fixMax) { extent[1] = numberUtil.round(mathCeil(extent[1] / interval) * interval); } }, // Overwrite niceTicks: function (approxTickNum) { approxTickNum = approxTickNum || 10; var extent = this._extent; var span = extent[1] - extent[0]; var approxInterval = span / approxTickNum; var scaleLevelsLen = scaleLevels.length; var idx = bisect(scaleLevels, approxInterval, 0, scaleLevelsLen); var level = scaleLevels[Math.min(idx, scaleLevelsLen - 1)]; var interval = level[2]; // Same with interval scale if span is much larger than 1 year if (level[0] === 'year') { var yearSpan = span / interval; // From "Nice Numbers for Graph Labels" of Graphic Gems // var niceYearSpan = numberUtil.nice(yearSpan, false); var yearStep = numberUtil.nice(yearSpan / approxTickNum, true); interval *= yearStep; } var niceExtent = [ mathCeil(extent[0] / interval) * interval, mathFloor(extent[1] / interval) * interval ]; this._stepLvl = level; // Interval will be used in getTicks this._interval = interval; this._niceExtent = niceExtent; }, parse: function (val) { // val might be float. return +numberUtil.parseDate(val); } }); zrUtil.each(['contain', 'normalize'], function (methodName) { TimeScale.prototype[methodName] = function (val) { return intervalScaleProto[methodName].call(this, this.parse(val)); }; }); // Steps from d3 var scaleLevels = [ // Format step interval ['hh:mm:ss', 1, ONE_SECOND], // 1s ['hh:mm:ss', 5, ONE_SECOND * 5], // 5s ['hh:mm:ss', 10, ONE_SECOND * 10], // 10s ['hh:mm:ss', 15, ONE_SECOND * 15], // 15s ['hh:mm:ss', 30, ONE_SECOND * 30], // 30s ['hh:mm\nMM-dd',1, ONE_MINUTE], // 1m ['hh:mm\nMM-dd',5, ONE_MINUTE * 5], // 5m ['hh:mm\nMM-dd',10, ONE_MINUTE * 10], // 10m ['hh:mm\nMM-dd',15, ONE_MINUTE * 15], // 15m ['hh:mm\nMM-dd',30, ONE_MINUTE * 30], // 30m ['hh:mm\nMM-dd',1, ONE_HOUR], // 1h ['hh:mm\nMM-dd',2, ONE_HOUR * 2], // 2h ['hh:mm\nMM-dd',6, ONE_HOUR * 6], // 6h ['hh:mm\nMM-dd',12, ONE_HOUR * 12], // 12h ['MM-dd\nyyyy', 1, ONE_DAY], // 1d ['week', 7, ONE_DAY * 7], // 7d ['month', 1, ONE_DAY * 31], // 1M ['quarter', 3, ONE_DAY * 380 / 4], // 3M ['half-year', 6, ONE_DAY * 380 / 2], // 6M ['year', 1, ONE_DAY * 380] // 1Y ]; /** * @return {module:echarts/scale/Time} */ TimeScale.create = function () { return new TimeScale(); }; return TimeScale; });