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import {geoProjection as projection} from "d3-geo";
import {abs, pi, sqrt} from "./math.js";
export function eckert1Raw(lambda, phi) {
var alpha = sqrt(8 / (3 * pi));
return [
alpha * lambda * (1 - abs(phi) / pi),
alpha * phi
];
}
eckert1Raw.invert = function(x, y) {
var alpha = sqrt(8 / (3 * pi)),
phi = y / alpha;
return [
x / (alpha * (1 - abs(phi) / pi)),
phi
];
};
export default function() {
return projection(eckert1Raw)
.scale(165.664);
}