src/scale/Time.js

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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 公用？
    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;