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470 lines
19 KiB
470 lines
19 KiB
var moment = require('../module/moment');
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/**
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* @constructor TimeStep
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* The class TimeStep is an iterator for dates. You provide a start date and an
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* end date. The class itself determines the best scale (step size) based on the
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* provided start Date, end Date, and minimumStep.
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*
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* If minimumStep is provided, the step size is chosen as close as possible
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* to the minimumStep but larger than minimumStep. If minimumStep is not
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* provided, the scale is set to 1 DAY.
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* The minimumStep should correspond with the onscreen size of about 6 characters
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*
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* Alternatively, you can set a scale by hand.
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* After creation, you can initialize the class by executing first(). Then you
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* can iterate from the start date to the end date via next(). You can check if
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* the end date is reached with the function hasNext(). After each step, you can
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* retrieve the current date via getCurrent().
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* The TimeStep has scales ranging from milliseconds, seconds, minutes, hours,
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* days, to years.
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*
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* Version: 1.2
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*
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* @param {Date} [start] The start date, for example new Date(2010, 9, 21)
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* or new Date(2010, 9, 21, 23, 45, 00)
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* @param {Date} [end] The end date
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* @param {Number} [minimumStep] Optional. Minimum step size in milliseconds
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*/
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function TimeStep(start, end, minimumStep) {
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// variables
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this.current = new Date();
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this._start = new Date();
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this._end = new Date();
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this.autoScale = true;
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this.scale = TimeStep.SCALE.DAY;
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this.step = 1;
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// initialize the range
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this.setRange(start, end, minimumStep);
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}
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/// enum scale
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TimeStep.SCALE = {
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MILLISECOND: 1,
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SECOND: 2,
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MINUTE: 3,
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HOUR: 4,
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DAY: 5,
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WEEKDAY: 6,
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MONTH: 7,
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YEAR: 8
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};
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/**
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* Set a new range
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* If minimumStep is provided, the step size is chosen as close as possible
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* to the minimumStep but larger than minimumStep. If minimumStep is not
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* provided, the scale is set to 1 DAY.
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* The minimumStep should correspond with the onscreen size of about 6 characters
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* @param {Date} [start] The start date and time.
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* @param {Date} [end] The end date and time.
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* @param {int} [minimumStep] Optional. Minimum step size in milliseconds
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*/
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TimeStep.prototype.setRange = function(start, end, minimumStep) {
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if (!(start instanceof Date) || !(end instanceof Date)) {
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throw "No legal start or end date in method setRange";
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}
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this._start = (start != undefined) ? new Date(start.valueOf()) : new Date();
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this._end = (end != undefined) ? new Date(end.valueOf()) : new Date();
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if (this.autoScale) {
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this.setMinimumStep(minimumStep);
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}
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};
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/**
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* Set the range iterator to the start date.
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*/
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TimeStep.prototype.first = function() {
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this.current = new Date(this._start.valueOf());
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this.roundToMinor();
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};
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/**
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* Round the current date to the first minor date value
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* This must be executed once when the current date is set to start Date
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*/
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TimeStep.prototype.roundToMinor = function() {
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// round to floor
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// IMPORTANT: we have no breaks in this switch! (this is no bug)
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//noinspection FallthroughInSwitchStatementJS
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switch (this.scale) {
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case TimeStep.SCALE.YEAR:
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this.current.setFullYear(this.step * Math.floor(this.current.getFullYear() / this.step));
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this.current.setMonth(0);
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case TimeStep.SCALE.MONTH: this.current.setDate(1);
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case TimeStep.SCALE.DAY: // intentional fall through
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case TimeStep.SCALE.WEEKDAY: this.current.setHours(0);
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case TimeStep.SCALE.HOUR: this.current.setMinutes(0);
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case TimeStep.SCALE.MINUTE: this.current.setSeconds(0);
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case TimeStep.SCALE.SECOND: this.current.setMilliseconds(0);
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//case TimeStep.SCALE.MILLISECOND: // nothing to do for milliseconds
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}
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if (this.step != 1) {
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// round down to the first minor value that is a multiple of the current step size
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switch (this.scale) {
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case TimeStep.SCALE.MILLISECOND: this.current.setMilliseconds(this.current.getMilliseconds() - this.current.getMilliseconds() % this.step); break;
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case TimeStep.SCALE.SECOND: this.current.setSeconds(this.current.getSeconds() - this.current.getSeconds() % this.step); break;
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case TimeStep.SCALE.MINUTE: this.current.setMinutes(this.current.getMinutes() - this.current.getMinutes() % this.step); break;
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case TimeStep.SCALE.HOUR: this.current.setHours(this.current.getHours() - this.current.getHours() % this.step); break;
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case TimeStep.SCALE.WEEKDAY: // intentional fall through
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case TimeStep.SCALE.DAY: this.current.setDate((this.current.getDate()-1) - (this.current.getDate()-1) % this.step + 1); break;
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case TimeStep.SCALE.MONTH: this.current.setMonth(this.current.getMonth() - this.current.getMonth() % this.step); break;
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case TimeStep.SCALE.YEAR: this.current.setFullYear(this.current.getFullYear() - this.current.getFullYear() % this.step); break;
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default: break;
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}
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}
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};
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/**
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* Check if the there is a next step
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* @return {boolean} true if the current date has not passed the end date
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*/
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TimeStep.prototype.hasNext = function () {
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return (this.current.valueOf() <= this._end.valueOf());
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};
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/**
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* Do the next step
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*/
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TimeStep.prototype.next = function() {
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var prev = this.current.valueOf();
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// Two cases, needed to prevent issues with switching daylight savings
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// (end of March and end of October)
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if (this.current.getMonth() < 6) {
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switch (this.scale) {
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case TimeStep.SCALE.MILLISECOND:
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this.current = new Date(this.current.valueOf() + this.step); break;
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case TimeStep.SCALE.SECOND: this.current = new Date(this.current.valueOf() + this.step * 1000); break;
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case TimeStep.SCALE.MINUTE: this.current = new Date(this.current.valueOf() + this.step * 1000 * 60); break;
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case TimeStep.SCALE.HOUR:
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this.current = new Date(this.current.valueOf() + this.step * 1000 * 60 * 60);
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// in case of skipping an hour for daylight savings, adjust the hour again (else you get: 0h 5h 9h ... instead of 0h 4h 8h ...)
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var h = this.current.getHours();
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this.current.setHours(h - (h % this.step));
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break;
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case TimeStep.SCALE.WEEKDAY: // intentional fall through
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case TimeStep.SCALE.DAY: this.current.setDate(this.current.getDate() + this.step); break;
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case TimeStep.SCALE.MONTH: this.current.setMonth(this.current.getMonth() + this.step); break;
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case TimeStep.SCALE.YEAR: this.current.setFullYear(this.current.getFullYear() + this.step); break;
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default: break;
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}
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}
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else {
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switch (this.scale) {
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case TimeStep.SCALE.MILLISECOND: this.current = new Date(this.current.valueOf() + this.step); break;
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case TimeStep.SCALE.SECOND: this.current.setSeconds(this.current.getSeconds() + this.step); break;
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case TimeStep.SCALE.MINUTE: this.current.setMinutes(this.current.getMinutes() + this.step); break;
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case TimeStep.SCALE.HOUR: this.current.setHours(this.current.getHours() + this.step); break;
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case TimeStep.SCALE.WEEKDAY: // intentional fall through
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case TimeStep.SCALE.DAY: this.current.setDate(this.current.getDate() + this.step); break;
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case TimeStep.SCALE.MONTH: this.current.setMonth(this.current.getMonth() + this.step); break;
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case TimeStep.SCALE.YEAR: this.current.setFullYear(this.current.getFullYear() + this.step); break;
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default: break;
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}
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}
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if (this.step != 1) {
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// round down to the correct major value
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switch (this.scale) {
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case TimeStep.SCALE.MILLISECOND: if(this.current.getMilliseconds() < this.step) this.current.setMilliseconds(0); break;
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case TimeStep.SCALE.SECOND: if(this.current.getSeconds() < this.step) this.current.setSeconds(0); break;
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case TimeStep.SCALE.MINUTE: if(this.current.getMinutes() < this.step) this.current.setMinutes(0); break;
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case TimeStep.SCALE.HOUR: if(this.current.getHours() < this.step) this.current.setHours(0); break;
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case TimeStep.SCALE.WEEKDAY: // intentional fall through
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case TimeStep.SCALE.DAY: if(this.current.getDate() < this.step+1) this.current.setDate(1); break;
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case TimeStep.SCALE.MONTH: if(this.current.getMonth() < this.step) this.current.setMonth(0); break;
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case TimeStep.SCALE.YEAR: break; // nothing to do for year
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default: break;
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}
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}
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// safety mechanism: if current time is still unchanged, move to the end
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if (this.current.valueOf() == prev) {
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this.current = new Date(this._end.valueOf());
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}
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};
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/**
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* Get the current datetime
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* @return {Date} current The current date
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*/
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TimeStep.prototype.getCurrent = function() {
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return this.current;
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};
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/**
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* Set a custom scale. Autoscaling will be disabled.
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* For example setScale(SCALE.MINUTES, 5) will result
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* in minor steps of 5 minutes, and major steps of an hour.
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*
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* @param {TimeStep.SCALE} newScale
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* A scale. Choose from SCALE.MILLISECOND,
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* SCALE.SECOND, SCALE.MINUTE, SCALE.HOUR,
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* SCALE.WEEKDAY, SCALE.DAY, SCALE.MONTH,
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* SCALE.YEAR.
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* @param {Number} newStep A step size, by default 1. Choose for
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* example 1, 2, 5, or 10.
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*/
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TimeStep.prototype.setScale = function(newScale, newStep) {
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this.scale = newScale;
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if (newStep > 0) {
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this.step = newStep;
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}
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this.autoScale = false;
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};
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/**
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* Enable or disable autoscaling
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* @param {boolean} enable If true, autoascaling is set true
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*/
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TimeStep.prototype.setAutoScale = function (enable) {
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this.autoScale = enable;
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};
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/**
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* Automatically determine the scale that bests fits the provided minimum step
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* @param {Number} [minimumStep] The minimum step size in milliseconds
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*/
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TimeStep.prototype.setMinimumStep = function(minimumStep) {
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if (minimumStep == undefined) {
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return;
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}
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var stepYear = (1000 * 60 * 60 * 24 * 30 * 12);
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var stepMonth = (1000 * 60 * 60 * 24 * 30);
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var stepDay = (1000 * 60 * 60 * 24);
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var stepHour = (1000 * 60 * 60);
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var stepMinute = (1000 * 60);
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var stepSecond = (1000);
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var stepMillisecond= (1);
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// find the smallest step that is larger than the provided minimumStep
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if (stepYear*1000 > minimumStep) {this.scale = TimeStep.SCALE.YEAR; this.step = 1000;}
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if (stepYear*500 > minimumStep) {this.scale = TimeStep.SCALE.YEAR; this.step = 500;}
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if (stepYear*100 > minimumStep) {this.scale = TimeStep.SCALE.YEAR; this.step = 100;}
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if (stepYear*50 > minimumStep) {this.scale = TimeStep.SCALE.YEAR; this.step = 50;}
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if (stepYear*10 > minimumStep) {this.scale = TimeStep.SCALE.YEAR; this.step = 10;}
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if (stepYear*5 > minimumStep) {this.scale = TimeStep.SCALE.YEAR; this.step = 5;}
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if (stepYear > minimumStep) {this.scale = TimeStep.SCALE.YEAR; this.step = 1;}
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if (stepMonth*3 > minimumStep) {this.scale = TimeStep.SCALE.MONTH; this.step = 3;}
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if (stepMonth > minimumStep) {this.scale = TimeStep.SCALE.MONTH; this.step = 1;}
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if (stepDay*5 > minimumStep) {this.scale = TimeStep.SCALE.DAY; this.step = 5;}
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if (stepDay*2 > minimumStep) {this.scale = TimeStep.SCALE.DAY; this.step = 2;}
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if (stepDay > minimumStep) {this.scale = TimeStep.SCALE.DAY; this.step = 1;}
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if (stepDay/2 > minimumStep) {this.scale = TimeStep.SCALE.WEEKDAY; this.step = 1;}
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if (stepHour*4 > minimumStep) {this.scale = TimeStep.SCALE.HOUR; this.step = 4;}
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if (stepHour > minimumStep) {this.scale = TimeStep.SCALE.HOUR; this.step = 1;}
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if (stepMinute*15 > minimumStep) {this.scale = TimeStep.SCALE.MINUTE; this.step = 15;}
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if (stepMinute*10 > minimumStep) {this.scale = TimeStep.SCALE.MINUTE; this.step = 10;}
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if (stepMinute*5 > minimumStep) {this.scale = TimeStep.SCALE.MINUTE; this.step = 5;}
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if (stepMinute > minimumStep) {this.scale = TimeStep.SCALE.MINUTE; this.step = 1;}
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if (stepSecond*15 > minimumStep) {this.scale = TimeStep.SCALE.SECOND; this.step = 15;}
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if (stepSecond*10 > minimumStep) {this.scale = TimeStep.SCALE.SECOND; this.step = 10;}
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if (stepSecond*5 > minimumStep) {this.scale = TimeStep.SCALE.SECOND; this.step = 5;}
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if (stepSecond > minimumStep) {this.scale = TimeStep.SCALE.SECOND; this.step = 1;}
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if (stepMillisecond*200 > minimumStep) {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 200;}
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if (stepMillisecond*100 > minimumStep) {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 100;}
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if (stepMillisecond*50 > minimumStep) {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 50;}
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if (stepMillisecond*10 > minimumStep) {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 10;}
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if (stepMillisecond*5 > minimumStep) {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 5;}
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if (stepMillisecond > minimumStep) {this.scale = TimeStep.SCALE.MILLISECOND; this.step = 1;}
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};
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/**
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* Snap a date to a rounded value.
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* The snap intervals are dependent on the current scale and step.
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* @param {Date} date the date to be snapped.
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* @return {Date} snappedDate
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*/
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TimeStep.prototype.snap = function(date) {
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var clone = new Date(date.valueOf());
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if (this.scale == TimeStep.SCALE.YEAR) {
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var year = clone.getFullYear() + Math.round(clone.getMonth() / 12);
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clone.setFullYear(Math.round(year / this.step) * this.step);
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clone.setMonth(0);
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clone.setDate(0);
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clone.setHours(0);
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clone.setMinutes(0);
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clone.setSeconds(0);
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clone.setMilliseconds(0);
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}
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else if (this.scale == TimeStep.SCALE.MONTH) {
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if (clone.getDate() > 15) {
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clone.setDate(1);
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clone.setMonth(clone.getMonth() + 1);
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// important: first set Date to 1, after that change the month.
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}
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else {
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clone.setDate(1);
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}
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clone.setHours(0);
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clone.setMinutes(0);
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clone.setSeconds(0);
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clone.setMilliseconds(0);
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}
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else if (this.scale == TimeStep.SCALE.DAY) {
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//noinspection FallthroughInSwitchStatementJS
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switch (this.step) {
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case 5:
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case 2:
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clone.setHours(Math.round(clone.getHours() / 24) * 24); break;
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default:
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clone.setHours(Math.round(clone.getHours() / 12) * 12); break;
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}
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clone.setMinutes(0);
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clone.setSeconds(0);
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clone.setMilliseconds(0);
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}
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else if (this.scale == TimeStep.SCALE.WEEKDAY) {
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//noinspection FallthroughInSwitchStatementJS
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switch (this.step) {
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case 5:
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case 2:
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clone.setHours(Math.round(clone.getHours() / 12) * 12); break;
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default:
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clone.setHours(Math.round(clone.getHours() / 6) * 6); break;
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}
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clone.setMinutes(0);
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clone.setSeconds(0);
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clone.setMilliseconds(0);
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}
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else if (this.scale == TimeStep.SCALE.HOUR) {
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switch (this.step) {
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case 4:
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clone.setMinutes(Math.round(clone.getMinutes() / 60) * 60); break;
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default:
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clone.setMinutes(Math.round(clone.getMinutes() / 30) * 30); break;
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}
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clone.setSeconds(0);
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clone.setMilliseconds(0);
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} else if (this.scale == TimeStep.SCALE.MINUTE) {
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//noinspection FallthroughInSwitchStatementJS
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switch (this.step) {
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case 15:
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case 10:
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clone.setMinutes(Math.round(clone.getMinutes() / 5) * 5);
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clone.setSeconds(0);
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break;
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case 5:
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clone.setSeconds(Math.round(clone.getSeconds() / 60) * 60); break;
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default:
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clone.setSeconds(Math.round(clone.getSeconds() / 30) * 30); break;
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}
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clone.setMilliseconds(0);
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}
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else if (this.scale == TimeStep.SCALE.SECOND) {
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//noinspection FallthroughInSwitchStatementJS
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switch (this.step) {
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case 15:
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case 10:
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clone.setSeconds(Math.round(clone.getSeconds() / 5) * 5);
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clone.setMilliseconds(0);
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break;
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case 5:
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clone.setMilliseconds(Math.round(clone.getMilliseconds() / 1000) * 1000); break;
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default:
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clone.setMilliseconds(Math.round(clone.getMilliseconds() / 500) * 500); break;
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}
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}
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else if (this.scale == TimeStep.SCALE.MILLISECOND) {
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var step = this.step > 5 ? this.step / 2 : 1;
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clone.setMilliseconds(Math.round(clone.getMilliseconds() / step) * step);
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}
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return clone;
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};
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/**
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* Check if the current value is a major value (for example when the step
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* is DAY, a major value is each first day of the MONTH)
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* @return {boolean} true if current date is major, else false.
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*/
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TimeStep.prototype.isMajor = function() {
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switch (this.scale) {
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case TimeStep.SCALE.MILLISECOND:
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return (this.current.getMilliseconds() == 0);
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case TimeStep.SCALE.SECOND:
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return (this.current.getSeconds() == 0);
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case TimeStep.SCALE.MINUTE:
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return (this.current.getHours() == 0) && (this.current.getMinutes() == 0);
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// Note: this is no bug. Major label is equal for both minute and hour scale
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case TimeStep.SCALE.HOUR:
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return (this.current.getHours() == 0);
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case TimeStep.SCALE.WEEKDAY: // intentional fall through
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case TimeStep.SCALE.DAY:
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return (this.current.getDate() == 1);
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case TimeStep.SCALE.MONTH:
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return (this.current.getMonth() == 0);
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case TimeStep.SCALE.YEAR:
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return false;
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default:
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return false;
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}
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};
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/**
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* Returns formatted text for the minor axislabel, depending on the current
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* date and the scale. For example when scale is MINUTE, the current time is
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* formatted as "hh:mm".
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* @param {Date} [date] custom date. if not provided, current date is taken
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*/
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TimeStep.prototype.getLabelMinor = function(date) {
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if (date == undefined) {
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date = this.current;
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}
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switch (this.scale) {
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case TimeStep.SCALE.MILLISECOND: return moment(date).format('SSS');
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case TimeStep.SCALE.SECOND: return moment(date).format('s');
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case TimeStep.SCALE.MINUTE: return moment(date).format('HH:mm');
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case TimeStep.SCALE.HOUR: return moment(date).format('HH:mm');
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case TimeStep.SCALE.WEEKDAY: return moment(date).format('ddd D');
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case TimeStep.SCALE.DAY: return moment(date).format('D');
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case TimeStep.SCALE.MONTH: return moment(date).format('MMM');
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case TimeStep.SCALE.YEAR: return moment(date).format('YYYY');
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default: return '';
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}
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};
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/**
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* Returns formatted text for the major axis label, depending on the current
|
|
* date and the scale. For example when scale is MINUTE, the major scale is
|
|
* hours, and the hour will be formatted as "hh".
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* @param {Date} [date] custom date. if not provided, current date is taken
|
|
*/
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TimeStep.prototype.getLabelMajor = function(date) {
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if (date == undefined) {
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date = this.current;
|
|
}
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//noinspection FallthroughInSwitchStatementJS
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switch (this.scale) {
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case TimeStep.SCALE.MILLISECOND:return moment(date).format('HH:mm:ss');
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case TimeStep.SCALE.SECOND: return moment(date).format('D MMMM HH:mm');
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case TimeStep.SCALE.MINUTE:
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case TimeStep.SCALE.HOUR: return moment(date).format('ddd D MMMM');
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|
case TimeStep.SCALE.WEEKDAY:
|
|
case TimeStep.SCALE.DAY: return moment(date).format('MMMM YYYY');
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|
case TimeStep.SCALE.MONTH: return moment(date).format('YYYY');
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|
case TimeStep.SCALE.YEAR: return '';
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|
default: return '';
|
|
}
|
|
};
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|
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module.exports = TimeStep;
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