Sha256: 4bfc3c3882c92cf5665b3dae4b46ecf7fc3d65f59d08249c9898debcf6ed25b2
Contents?: true
Size: 830 Bytes
Versions: 4
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Stored size: 830 Bytes
Contents
function mollweideBromleyθ(Cp) {
return function(θ) {
var Cpsinθ = Cp * Math.sin(θ),
i = 30, δ;
do θ -= δ = (θ + Math.sin(θ) - Cpsinθ) / (1 + Math.cos(θ));
while (Math.abs(δ) > ε && --i > 0);
return θ / 2;
};
}
function mollweideBromley(Cx, Cy, Cp) {
var θ = mollweideBromleyθ(Cp);
function forward(λ, φ) {
return [
Cx * λ * Math.cos(φ = θ(φ)),
Cy * Math.sin(φ)
];
}
forward.invert = function(x, y) {
var θ = asin(y / Cy);
return [
x / (Cx * Math.cos(θ)),
asin((2 * θ + Math.sin(2 * θ)) / Cp)
];
};
return forward;
}
var mollweideθ = mollweideBromleyθ(π),
mollweide = mollweideBromley(2 * Math.SQRT2 / π, Math.SQRT2, π);
(d3.geo.mollweide = function() { return projection(mollweide); }).raw = mollweide;
Version data entries
4 entries across 4 versions & 1 rubygems