@bokeh/bokehjs
Version:
Interactive, novel data visualization
86 lines • 2.66 kB
JavaScript
import proj4 from "proj4/lib/core";
import Projection from "proj4/lib/Proj";
import { infer_type } from "../types";
const mercator = new Projection("GOOGLE");
const wgs84 = new Projection("WGS84");
const _wgs84_mercator = proj4(wgs84, mercator);
export const wgs84_mercator = {
compute(x, y) {
if (isFinite(x) && isFinite(y)) {
return _wgs84_mercator.forward([x, y]);
}
else {
return [NaN, NaN];
}
},
invert(merc_x, merc_y) {
if (isFinite(merc_x) && isFinite(merc_y)) {
return _wgs84_mercator.inverse([merc_x, merc_y]);
}
else {
return [NaN, NaN];
}
},
};
const mercator_bounds = {
lon: [-20026376.39, 20026376.39],
lat: [-20048966.10, 20048966.10],
};
const latlon_bounds = {
lon: [-180, 180],
lat: [-85.06, 85.06],
};
const { min, max } = Math;
export function clip_mercator(low, high, dimension) {
const [vmin, vmax] = mercator_bounds[dimension];
return [max(low, vmin), min(high, vmax)];
}
export function in_bounds(value, dimension) {
const [min, max] = latlon_bounds[dimension];
return min < value && value < max;
}
export var inplace;
(function (inplace) {
function project_xy(x, y, merc_x, merc_y) {
const n = min(x.length, y.length);
merc_x = merc_x ?? x;
merc_y = merc_y ?? y;
for (let i = 0; i < n; i++) {
const xi = x[i];
const yi = y[i];
const [merc_xi, merc_yi] = wgs84_mercator.compute(xi, yi);
merc_x[i] = merc_xi;
merc_y[i] = merc_yi;
}
}
inplace.project_xy = project_xy;
function project_xsys(xs, ys, merc_xs, merc_ys) {
const n = min(xs.length, ys.length);
merc_xs = merc_xs ?? xs;
merc_ys = merc_ys ?? ys;
for (let i = 0; i < n; i++) {
project_xy(xs[i], ys[i], merc_xs[i], merc_ys[i]);
}
}
inplace.project_xsys = project_xsys;
})(inplace || (inplace = {}));
export function project_xy(x, y) {
const n = min(x.length, y.length);
const ArrayType = infer_type(x, y);
const merc_x = new ArrayType(n);
const merc_y = new ArrayType(n);
inplace.project_xy(x, y, merc_x, merc_y);
return [merc_x, merc_y];
}
export function project_xsys(xs, ys) {
const n = min(xs.length, ys.length);
const merc_xs = new Array(n);
const merc_ys = new Array(n);
for (let i = 0; i < n; i++) {
const [merc_x, merc_y] = project_xy(xs[i], ys[i]);
merc_xs[i] = merc_x;
merc_ys[i] = merc_y;
}
return [merc_xs, merc_ys];
}
//# sourceMappingURL=projections.js.map