@bokeh/bokehjs
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Interactive, novel data visualization
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JavaScript
import { BasicTicker } from "./basic_ticker";
import { LatLon } from "../../core/enums";
import { wgs84_mercator, clip_mercator, in_bounds } from "../../core/util/projections";
export class MercatorTicker extends BasicTicker {
static __name__ = "MercatorTicker";
constructor(attrs) {
super(attrs);
}
static {
this.define(({ Nullable }) => ({
dimension: [Nullable(LatLon), null],
}));
}
get_ticks_no_defaults(data_low, data_high, cross_loc, desired_n_ticks) {
if (this.dimension == null) {
throw new Error(`${this}.dimension wasn't configured`);
}
[data_low, data_high] = clip_mercator(data_low, data_high, this.dimension);
if (this.dimension == "lon") {
return this._get_ticks_lon(data_low, data_high, cross_loc, desired_n_ticks);
}
else {
return this._get_ticks_lat(data_low, data_high, cross_loc, desired_n_ticks);
}
}
_get_ticks_lon(data_low, data_high, cross_loc, desired_n_ticks) {
const [proj_low] = wgs84_mercator.invert(data_low, cross_loc);
const [proj_high, proj_cross_loc] = wgs84_mercator.invert(data_high, cross_loc);
const proj_ticks = super.get_ticks_no_defaults(proj_low, proj_high, cross_loc, desired_n_ticks);
const major = [];
for (const tick of proj_ticks.major) {
if (in_bounds(tick, "lon")) {
const [lon] = wgs84_mercator.compute(tick, proj_cross_loc);
major.push(lon);
}
}
const minor = [];
for (const tick of proj_ticks.minor) {
if (in_bounds(tick, "lon")) {
const [lon] = wgs84_mercator.compute(tick, proj_cross_loc);
minor.push(lon);
}
}
return { major, minor };
}
_get_ticks_lat(data_low, data_high, cross_loc, desired_n_ticks) {
const [, proj_low] = wgs84_mercator.invert(cross_loc, data_low);
const [proj_cross_loc, proj_high] = wgs84_mercator.invert(cross_loc, data_high);
const proj_ticks = super.get_ticks_no_defaults(proj_low, proj_high, cross_loc, desired_n_ticks);
const major = [];
for (const tick of proj_ticks.major) {
if (in_bounds(tick, "lat")) {
const [, lat] = wgs84_mercator.compute(proj_cross_loc, tick);
major.push(lat);
}
}
const minor = [];
for (const tick of proj_ticks.minor) {
if (in_bounds(tick, "lat")) {
const [, lat] = wgs84_mercator.compute(proj_cross_loc, tick);
minor.push(lat);
}
}
return { major, minor };
}
}
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