vis.js is a dynamic, browser-based visualization library
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var moment = require('../module/moment');
var DateUtil = require('./DateUtil');
var util = require('../util');
/**
* @constructor TimeStep
* The class TimeStep is an iterator for dates. You provide a start date and an
* end date. The class itself determines the best scale (step size) based on the
* provided start Date, end Date, and minimumStep.
*
* If minimumStep is provided, the step size is chosen as close as possible
* to the minimumStep but larger than minimumStep. If minimumStep is not
* provided, the scale is set to 1 DAY.
* The minimumStep should correspond with the onscreen size of about 6 characters
*
* Alternatively, you can set a scale by hand.
* After creation, you can initialize the class by executing first(). Then you
* can iterate from the start date to the end date via next(). You can check if
* the end date is reached with the function hasNext(). After each step, you can
* retrieve the current date via getCurrent().
* The TimeStep has scales ranging from milliseconds, seconds, minutes, hours,
* days, to years.
*
* Version: 1.2
*
* @param {Date} [start] The start date, for example new Date(2010, 9, 21)
* or new Date(2010, 9, 21, 23, 45, 00)
* @param {Date} [end] The end date
* @param {Number} [minimumStep] Optional. Minimum step size in milliseconds
*/
function TimeStep(start, end, minimumStep, hiddenDates) {
// variables
this.current = new Date();
this._start = new Date();
this._end = new Date();
this.autoScale = true;
this.scale = 'day';
this.step = 1;
// initialize the range
this.setRange(start, end, minimumStep);
// hidden Dates options
this.switchedDay = false;
this.switchedMonth = false;
this.switchedYear = false;
this.hiddenDates = hiddenDates;
if (hiddenDates === undefined) {
this.hiddenDates = [];
}
this.format = TimeStep.FORMAT; // default formatting
}
// Time formatting
TimeStep.FORMAT = {
minorLabels: {
millisecond:'SSS',
second: 's',
minute: 'HH:mm',
hour: 'HH:mm',
weekday: 'ddd D',
day: 'D',
month: 'MMM',
year: 'YYYY'
},
majorLabels: {
millisecond:'HH:mm:ss',
second: 'D MMMM HH:mm',
minute: 'ddd D MMMM',
hour: 'ddd D MMMM',
weekday: 'MMMM YYYY',
day: 'MMMM YYYY',
month: 'YYYY',
year: ''
}
};
/**
* Set custom formatting for the minor an major labels of the TimeStep.
* Both `minorLabels` and `majorLabels` are an Object with properties:
* 'millisecond, 'second, 'minute', 'hour', 'weekday, 'day, 'month, 'year'.
* @param {{minorLabels: Object, majorLabels: Object}} format
*/
TimeStep.prototype.setFormat = function (format) {
var defaultFormat = util.deepExtend({}, TimeStep.FORMAT);
this.format = util.deepExtend(defaultFormat, format);
};
/**
* Set a new range
* If minimumStep is provided, the step size is chosen as close as possible
* to the minimumStep but larger than minimumStep. If minimumStep is not
* provided, the scale is set to 1 DAY.
* The minimumStep should correspond with the onscreen size of about 6 characters
* @param {Date} [start] The start date and time.
* @param {Date} [end] The end date and time.
* @param {int} [minimumStep] Optional. Minimum step size in milliseconds
*/
TimeStep.prototype.setRange = function(start, end, minimumStep) {
if (!(start instanceof Date) || !(end instanceof Date)) {
throw "No legal start or end date in method setRange";
}
this._start = (start != undefined) ? new Date(start.valueOf()) : new Date();
this._end = (end != undefined) ? new Date(end.valueOf()) : new Date();
if (this.autoScale) {
this.setMinimumStep(minimumStep);
}
};
/**
* Set the range iterator to the start date.
*/
TimeStep.prototype.first = function() {
this.current = new Date(this._start.valueOf());
this.roundToMinor();
};
/**
* Round the current date to the first minor date value
* This must be executed once when the current date is set to start Date
*/
TimeStep.prototype.roundToMinor = function() {
// round to floor
// IMPORTANT: we have no breaks in this switch! (this is no bug)
// noinspection FallThroughInSwitchStatementJS
switch (this.scale) {
case 'year':
this.current.setFullYear(this.step * Math.floor(this.current.getFullYear() / this.step));
this.current.setMonth(0);
case 'month': this.current.setDate(1);
case 'day': // intentional fall through
case 'weekday': this.current.setHours(0);
case 'hour': this.current.setMinutes(0);
case 'minute': this.current.setSeconds(0);
case 'second': this.current.setMilliseconds(0);
//case 'millisecond': // nothing to do for milliseconds
}
if (this.step != 1) {
// round down to the first minor value that is a multiple of the current step size
switch (this.scale) {
case 'millisecond': this.current.setMilliseconds(this.current.getMilliseconds() - this.current.getMilliseconds() % this.step); break;
case 'second': this.current.setSeconds(this.current.getSeconds() - this.current.getSeconds() % this.step); break;
case 'minute': this.current.setMinutes(this.current.getMinutes() - this.current.getMinutes() % this.step); break;
case 'hour': this.current.setHours(this.current.getHours() - this.current.getHours() % this.step); break;
case 'weekday': // intentional fall through
case 'day': this.current.setDate((this.current.getDate()-1) - (this.current.getDate()-1) % this.step + 1); break;
case 'month': this.current.setMonth(this.current.getMonth() - this.current.getMonth() % this.step); break;
case 'year': this.current.setFullYear(this.current.getFullYear() - this.current.getFullYear() % this.step); break;
default: break;
}
}
};
/**
* Check if the there is a next step
* @return {boolean} true if the current date has not passed the end date
*/
TimeStep.prototype.hasNext = function () {
return (this.current.valueOf() <= this._end.valueOf());
};
/**
* Do the next step
*/
TimeStep.prototype.next = function() {
var prev = this.current.valueOf();
// Two cases, needed to prevent issues with switching daylight savings
// (end of March and end of October)
if (this.current.getMonth() < 6) {
switch (this.scale) {
case 'millisecond':
this.current = new Date(this.current.valueOf() + this.step); break;
case 'second': this.current = new Date(this.current.valueOf() + this.step * 1000); break;
case 'minute': this.current = new Date(this.current.valueOf() + this.step * 1000 * 60); break;
case 'hour':
this.current = new Date(this.current.valueOf() + this.step * 1000 * 60 * 60);
// in case of skipping an hour for daylight savings, adjust the hour again (else you get: 0h 5h 9h ... instead of 0h 4h 8h ...)
var h = this.current.getHours();
this.current.setHours(h - (h % this.step));
break;
case 'weekday': // intentional fall through
case 'day': this.current.setDate(this.current.getDate() + this.step); break;
case 'month': this.current.setMonth(this.current.getMonth() + this.step); break;
case 'year': this.current.setFullYear(this.current.getFullYear() + this.step); break;
default: break;
}
}
else {
switch (this.scale) {
case 'millisecond': this.current = new Date(this.current.valueOf() + this.step); break;
case 'second': this.current.setSeconds(this.current.getSeconds() + this.step); break;
case 'minute': this.current.setMinutes(this.current.getMinutes() + this.step); break;
case 'hour': this.current.setHours(this.current.getHours() + this.step); break;
case 'weekday': // intentional fall through
case 'day': this.current.setDate(this.current.getDate() + this.step); break;
case 'month': this.current.setMonth(this.current.getMonth() + this.step); break;
case 'year': this.current.setFullYear(this.current.getFullYear() + this.step); break;
default: break;
}
}
if (this.step != 1) {
// round down to the correct major value
switch (this.scale) {
case 'millisecond': if(this.current.getMilliseconds() < this.step) this.current.setMilliseconds(0); break;
case 'second': if(this.current.getSeconds() < this.step) this.current.setSeconds(0); break;
case 'minute': if(this.current.getMinutes() < this.step) this.current.setMinutes(0); break;
case 'hour': if(this.current.getHours() < this.step) this.current.setHours(0); break;
case 'weekday': // intentional fall through
case 'day': if(this.current.getDate() < this.step+1) this.current.setDate(1); break;
case 'month': if(this.current.getMonth() < this.step) this.current.setMonth(0); break;
case 'year': break; // nothing to do for year
default: break;
}
}
// safety mechanism: if current time is still unchanged, move to the end
if (this.current.valueOf() == prev) {
this.current = new Date(this._end.valueOf());
}
DateUtil.stepOverHiddenDates(this, prev);
};
/**
* Get the current datetime
* @return {Date} current The current date
*/
TimeStep.prototype.getCurrent = function() {
return this.current;
};
/**
* Set a custom scale. Autoscaling will be disabled.
* For example setScale('minute', 5) will result
* in minor steps of 5 minutes, and major steps of an hour.
*
* @param {{scale: string, step: number}} params
* An object containing two properties:
* - A string 'scale'. Choose from 'millisecond', 'second',
* 'minute', 'hour', 'weekday, 'day, 'month, 'year'.
* - A number 'step'. A step size, by default 1.
* Choose for example 1, 2, 5, or 10.
*/
TimeStep.prototype.setScale = function(params) {
if (params && typeof params.scale == 'string') {
this.scale = params.scale;
this.step = params.step > 0 ? params.step : 1;
this.autoScale = false;
}
};
/**
* Enable or disable autoscaling
* @param {boolean} enable If true, autoascaling is set true
*/
TimeStep.prototype.setAutoScale = function (enable) {
this.autoScale = enable;
};
/**
* Automatically determine the scale that bests fits the provided minimum step
* @param {Number} [minimumStep] The minimum step size in milliseconds
*/
TimeStep.prototype.setMinimumStep = function(minimumStep) {
if (minimumStep == undefined) {
return;
}
//var b = asc + ds;
var stepYear = (1000 * 60 * 60 * 24 * 30 * 12);
var stepMonth = (1000 * 60 * 60 * 24 * 30);
var stepDay = (1000 * 60 * 60 * 24);
var stepHour = (1000 * 60 * 60);
var stepMinute = (1000 * 60);
var stepSecond = (1000);
var stepMillisecond= (1);
// find the smallest step that is larger than the provided minimumStep
if (stepYear*1000 > minimumStep) {this.scale = 'year'; this.step = 1000;}
if (stepYear*500 > minimumStep) {this.scale = 'year'; this.step = 500;}
if (stepYear*100 > minimumStep) {this.scale = 'year'; this.step = 100;}
if (stepYear*50 > minimumStep) {this.scale = 'year'; this.step = 50;}
if (stepYear*10 > minimumStep) {this.scale = 'year'; this.step = 10;}
if (stepYear*5 > minimumStep) {this.scale = 'year'; this.step = 5;}
if (stepYear > minimumStep) {this.scale = 'year'; this.step = 1;}
if (stepMonth*3 > minimumStep) {this.scale = 'month'; this.step = 3;}
if (stepMonth > minimumStep) {this.scale = 'month'; this.step = 1;}
if (stepDay*5 > minimumStep) {this.scale = 'day'; this.step = 5;}
if (stepDay*2 > minimumStep) {this.scale = 'day'; this.step = 2;}
if (stepDay > minimumStep) {this.scale = 'day'; this.step = 1;}
if (stepDay/2 > minimumStep) {this.scale = 'weekday'; this.step = 1;}
if (stepHour*4 > minimumStep) {this.scale = 'hour'; this.step = 4;}
if (stepHour > minimumStep) {this.scale = 'hour'; this.step = 1;}
if (stepMinute*15 > minimumStep) {this.scale = 'minute'; this.step = 15;}
if (stepMinute*10 > minimumStep) {this.scale = 'minute'; this.step = 10;}
if (stepMinute*5 > minimumStep) {this.scale = 'minute'; this.step = 5;}
if (stepMinute > minimumStep) {this.scale = 'minute'; this.step = 1;}
if (stepSecond*15 > minimumStep) {this.scale = 'second'; this.step = 15;}
if (stepSecond*10 > minimumStep) {this.scale = 'second'; this.step = 10;}
if (stepSecond*5 > minimumStep) {this.scale = 'second'; this.step = 5;}
if (stepSecond > minimumStep) {this.scale = 'second'; this.step = 1;}
if (stepMillisecond*200 > minimumStep) {this.scale = 'millisecond'; this.step = 200;}
if (stepMillisecond*100 > minimumStep) {this.scale = 'millisecond'; this.step = 100;}
if (stepMillisecond*50 > minimumStep) {this.scale = 'millisecond'; this.step = 50;}
if (stepMillisecond*10 > minimumStep) {this.scale = 'millisecond'; this.step = 10;}
if (stepMillisecond*5 > minimumStep) {this.scale = 'millisecond'; this.step = 5;}
if (stepMillisecond > minimumStep) {this.scale = 'millisecond'; this.step = 1;}
};
/**
* Snap a date to a rounded value.
* The snap intervals are dependent on the current scale and step.
* @param {Date} date the date to be snapped.
* @return {Date} snappedDate
*/
TimeStep.prototype.snap = function(date) {
var clone = new Date(date.valueOf());
if (this.scale == 'year') {
var year = clone.getFullYear() + Math.round(clone.getMonth() / 12);
clone.setFullYear(Math.round(year / this.step) * this.step);
clone.setMonth(0);
clone.setDate(0);
clone.setHours(0);
clone.setMinutes(0);
clone.setSeconds(0);
clone.setMilliseconds(0);
}
else if (this.scale == 'month') {
if (clone.getDate() > 15) {
clone.setDate(1);
clone.setMonth(clone.getMonth() + 1);
// important: first set Date to 1, after that change the month.
}
else {
clone.setDate(1);
}
clone.setHours(0);
clone.setMinutes(0);
clone.setSeconds(0);
clone.setMilliseconds(0);
}
else if (this.scale == 'day') {
//noinspection FallthroughInSwitchStatementJS
switch (this.step) {
case 5:
case 2:
clone.setHours(Math.round(clone.getHours() / 24) * 24); break;
default:
clone.setHours(Math.round(clone.getHours() / 12) * 12); break;
}
clone.setMinutes(0);
clone.setSeconds(0);
clone.setMilliseconds(0);
}
else if (this.scale == 'weekday') {
//noinspection FallthroughInSwitchStatementJS
switch (this.step) {
case 5:
case 2:
clone.setHours(Math.round(clone.getHours() / 12) * 12); break;
default:
clone.setHours(Math.round(clone.getHours() / 6) * 6); break;
}
clone.setMinutes(0);
clone.setSeconds(0);
clone.setMilliseconds(0);
}
else if (this.scale == 'hour') {
switch (this.step) {
case 4:
clone.setMinutes(Math.round(clone.getMinutes() / 60) * 60); break;
default:
clone.setMinutes(Math.round(clone.getMinutes() / 30) * 30); break;
}
clone.setSeconds(0);
clone.setMilliseconds(0);
} else if (this.scale == 'minute') {
//noinspection FallthroughInSwitchStatementJS
switch (this.step) {
case 15:
case 10:
clone.setMinutes(Math.round(clone.getMinutes() / 5) * 5);
clone.setSeconds(0);
break;
case 5:
clone.setSeconds(Math.round(clone.getSeconds() / 60) * 60); break;
default:
clone.setSeconds(Math.round(clone.getSeconds() / 30) * 30); break;
}
clone.setMilliseconds(0);
}
else if (this.scale == 'second') {
//noinspection FallthroughInSwitchStatementJS
switch (this.step) {
case 15:
case 10:
clone.setSeconds(Math.round(clone.getSeconds() / 5) * 5);
clone.setMilliseconds(0);
break;
case 5:
clone.setMilliseconds(Math.round(clone.getMilliseconds() / 1000) * 1000); break;
default:
clone.setMilliseconds(Math.round(clone.getMilliseconds() / 500) * 500); break;
}
}
else if (this.scale == 'millisecond') {
var step = this.step > 5 ? this.step / 2 : 1;
clone.setMilliseconds(Math.round(clone.getMilliseconds() / step) * step);
}
return clone;
};
/**
* Check if the current value is a major value (for example when the step
* is DAY, a major value is each first day of the MONTH)
* @return {boolean} true if current date is major, else false.
*/
TimeStep.prototype.isMajor = function() {
if (this.switchedYear == true) {
this.switchedYear = false;
switch (this.scale) {
case 'year':
case 'month':
case 'weekday':
case 'day':
case 'hour':
case 'minute':
case 'second':
case 'millisecond':
return true;
default:
return false;
}
}
else if (this.switchedMonth == true) {
this.switchedMonth = false;
switch (this.scale) {
case 'weekday':
case 'day':
case 'hour':
case 'minute':
case 'second':
case 'millisecond':
return true;
default:
return false;
}
}
else if (this.switchedDay == true) {
this.switchedDay = false;
switch (this.scale) {
case 'millisecond':
case 'second':
case 'minute':
case 'hour':
return true;
default:
return false;
}
}
switch (this.scale) {
case 'millisecond':
return (this.current.getMilliseconds() == 0);
case 'second':
return (this.current.getSeconds() == 0);
case 'minute':
return (this.current.getHours() == 0) && (this.current.getMinutes() == 0);
case 'hour':
return (this.current.getHours() == 0);
case 'weekday': // intentional fall through
case 'day':
return (this.current.getDate() == 1);
case 'month':
return (this.current.getMonth() == 0);
case 'year':
return false;
default:
return false;
}
};
/**
* Returns formatted text for the minor axislabel, depending on the current
* date and the scale. For example when scale is MINUTE, the current time is
* formatted as "hh:mm".
* @param {Date} [date] custom date. if not provided, current date is taken
*/
TimeStep.prototype.getLabelMinor = function(date) {
if (date == undefined) {
date = this.current;
}
var format = this.format.minorLabels[this.scale];
return (format && format.length > 0) ? moment(date).format(format) : '';
};
/**
* 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".
* @param {Date} [date] custom date. if not provided, current date is taken
*/
TimeStep.prototype.getLabelMajor = function(date) {
if (date == undefined) {
date = this.current;
}
var format = this.format.majorLabels[this.scale];
return (format && format.length > 0) ? moment(date).format(format) : '';
};
TimeStep.prototype.getClassName = function() {
var m = moment(this.current);
var date = m.locale ? m.locale('en') : m.lang('en'); // old versions of moment have .lang() function
var step = this.step;
function even(value) {
return (value / step % 2 == 0) ? ' even' : ' odd';
}
function today(date) {
if (date.isSame(new Date(), 'day')) {
return ' today';
}
if (date.isSame(moment().add(1, 'day'), 'day')) {
return ' tomorrow';
}
if (date.isSame(moment().add(-1, 'day'), 'day')) {
return ' yesterday';
}
return '';
}
function currentWeek(date) {
return date.isSame(new Date(), 'week') ? ' current-week' : '';
}
function currentMonth(date) {
return date.isSame(new Date(), 'month') ? ' current-month' : '';
}
function currentYear(date) {
return date.isSame(new Date(), 'year') ? ' current-year' : '';
}
switch (this.scale) {
case 'millisecond':
return even(date.milliseconds()).trim();
case 'second':
return even(date.seconds()).trim();
case 'minute':
return even(date.minutes()).trim();
case 'hour':
var hours = date.hours();
if (this.step == 4) {
hours = hours + '-' + (hours + 4);
}
return hours + 'h' + today(date) + even(date.hours());
case 'weekday':
return date.format('dddd').toLowerCase() +
today(date) + currentWeek(date) + even(date.date());
case 'day':
var day = date.date();
var month = date.format('MMMM').toLowerCase();
return 'day' + day + ' ' + month + currentMonth(date) + even(day - 1);
case 'month':
return date.format('MMMM').toLowerCase() +
currentMonth(date) + even(date.month());
case 'year':
var year = date.year();
return 'year' + year + currentYear(date)+ even(year);
default:
return '';
}
};
module.exports = TimeStep;