@bokeh/bokehjs
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Interactive, novel data visualization
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JavaScript
import { BaseSingleIntervalTicker } from "./single_interval_ticker";
import { copy_date, last_month_no_later_than, ONE_DAY } from "./util";
import { concat } from "../../core/util/array";
// Given a start and end time in millis, returns the shortest array of
// consecutive months (as Dates) that surrounds both times.
function date_range_by_month(start_time, end_time) {
const start_date = last_month_no_later_than(new Date(start_time));
const end_date = last_month_no_later_than(new Date(end_time));
// XXX This is not a reliable technique in general, but it should be
// safe when the day of the month is 1. (The problem case is this:
// Mar 31 -> Apr 31, which becomes May 1.)
end_date.setUTCMonth(end_date.getUTCMonth() + 1);
const dates = [];
const date = start_date;
while (true) {
dates.push(copy_date(date));
date.setUTCMonth(date.getUTCMonth() + 1);
if (date > end_date) {
break;
}
}
return dates;
}
export class DaysTicker extends BaseSingleIntervalTicker {
static __name__ = "DaysTicker";
constructor(attrs) {
super(attrs);
}
static {
this.define(({ Int, List }) => ({
days: [List(Int), []],
}));
this.override({
num_minor_ticks: 0,
});
}
interval;
initialize() {
super.initialize();
const days = this.days;
if (days.length > 1) {
this.interval = (days[1] - days[0]) * ONE_DAY;
}
else {
this.interval = 31 * ONE_DAY;
}
}
get_ticks_no_defaults(data_low, data_high, _cross_loc, _desired_n_ticks) {
const month_dates = date_range_by_month(data_low, data_high);
const days = this.days;
const days_of_month = (month_date, interval) => {
const current_month = month_date.getUTCMonth();
const dates = [];
for (const day of days) {
const day_date = copy_date(month_date);
day_date.setUTCDate(day);
// We can't use all of the values in this.days, because they may not
// fall within the current month. In fact, if, e.g., our month is 28 days
// and we're marking every third day, we don't want day 28 to show up
// because it'll be right next to the 1st of the next month. So we
// make sure we have a bit of room before we include a day.
// TODO (bev) The above description does not exactly work because JS Date
// is broken and will happily consider "Feb 28 + 3*ONE_DAY" to have month "2"
const future_date = new Date(day_date.getTime() + (interval / 2));
if (future_date.getUTCMonth() == current_month) {
dates.push(day_date);
}
}
return dates;
};
const day_dates = concat(month_dates.map((date) => days_of_month(date, this.interval)));
const all_ticks = day_dates.map((day_date) => day_date.getTime());
const ticks_in_range = all_ticks.filter((tick) => data_low <= tick && tick <= data_high);
return {
major: ticks_in_range,
minor: [],
};
}
}
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