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Stored size: 464 Bytes
Contents
import "projection";
function eckert2(λ, φ) {
var α = Math.sqrt(4 - 3 * Math.sin(Math.abs(φ)));
return [
2 / Math.sqrt(6 * π) * λ * α,
sgn(φ) * Math.sqrt(2 * π / 3) * (2 - α)
];
}
eckert2.invert = function(x, y) {
var α = 2 - Math.abs(y) / Math.sqrt(2 * π / 3);
return [
x * Math.sqrt(6 * π) / (2 * α),
sgn(y) * asin((4 - α * α) / 3)
];
};
(d3.geo.eckert2 = function() { return projection(eckert2); }).raw = eckert2;
Version data entries
4 entries across 4 versions & 1 rubygems