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Size: 567 Bytes
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Stored size: 567 Bytes
Contents
import "projection";
function eckert6(λ, φ) {
var k = (1 + π / 2) * Math.sin(φ);
for (var i = 0, δ = Infinity; i < 10 && Math.abs(δ) > ε; i++) {
φ -= δ = (φ + Math.sin(φ) - k) / (1 + Math.cos(φ));
}
k = Math.sqrt(2 + π);
return [
λ * (1 + Math.cos(φ)) / k,
2 * φ / k
];
}
eckert6.invert = function(x, y) {
var j = 1 + π / 2,
k = Math.sqrt(j / 2);
return [
x * 2 * k / (1 + Math.cos(y *= k)),
asin((y + Math.sin(y)) / j)
];
};
(d3.geo.eckert6 = function() { return projection(eckert6); }).raw = eckert6;
Version data entries
4 entries across 4 versions & 1 rubygems