@bokeh/bokehjs/build/js/lib/models/formatters/mercator_tick_formatter.js

Interactive, novel data visualization

import { BasicTickFormatter } from "./basic_tick_formatter";
import { LatLon } from "../../core/enums";
import { wgs84_mercator } from "../../core/util/projections";
export class MercatorTickFormatter extends BasicTickFormatter {
    static __name__ = "MercatorTickFormatter";
    constructor(attrs) {
        super(attrs);
    }
    static {
        this.define(({ Nullable }) => ({
            dimension: [Nullable(LatLon), null],
        }));
    }
    doFormat(ticks, opts) {
        if (this.dimension == null) {
            throw new Error("MercatorTickFormatter.dimension not configured");
        }
        if (ticks.length == 0) {
            return [];
        }
        const n = ticks.length;
        const proj_ticks = new Array(n);
        if (this.dimension == "lon") {
            for (let i = 0; i < n; i++) {
                const [lon] = wgs84_mercator.invert(ticks[i], opts.loc);
                proj_ticks[i] = lon;
            }
        }
        else {
            for (let i = 0; i < n; i++) {
                const [, lat] = wgs84_mercator.invert(opts.loc, ticks[i]);
                proj_ticks[i] = lat;
            }
        }
        return super.doFormat(proj_ticks, opts);
    }
}
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