@bokeh/bokehjs
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Interactive, novel data visualization
61 lines • 2.18 kB
JavaScript
import { BaseSingleIntervalTicker } from "./single_interval_ticker";
import { copy_date, last_year_no_later_than, ONE_MONTH } from "./util";
import { concat } from "../../core/util/array";
// Given a start and end time in millis, returns the shortest array of
// consecutive years (as Dates) that surrounds both times.
function date_range_by_year(start_time, end_time) {
const start_date = last_year_no_later_than(new Date(start_time));
const end_date = last_year_no_later_than(new Date(end_time));
end_date.setUTCFullYear(end_date.getUTCFullYear() + 1);
const dates = [];
const date = start_date;
while (true) {
dates.push(copy_date(date));
date.setUTCFullYear(date.getUTCFullYear() + 1);
if (date > end_date) {
break;
}
}
return dates;
}
export class MonthsTicker extends BaseSingleIntervalTicker {
static __name__ = "MonthsTicker";
constructor(attrs) {
super(attrs);
}
static {
this.define(({ Int, List }) => ({
months: [List(Int), []],
}));
}
interval;
initialize() {
super.initialize();
const months = this.months;
if (months.length > 1) {
this.interval = (months[1] - months[0]) * ONE_MONTH;
}
else {
this.interval = 12 * ONE_MONTH;
}
}
get_ticks_no_defaults(data_low, data_high, _cross_loc, _desired_n_ticks) {
const year_dates = date_range_by_year(data_low, data_high);
const months = this.months;
const months_of_year = (year_date) => {
return months.map((month) => {
const month_date = copy_date(year_date);
month_date.setUTCMonth(month);
return month_date;
});
};
const month_dates = concat(year_dates.map(months_of_year));
const all_ticks = month_dates.map((month_date) => month_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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