Sha256: b59f961eacb5eded1314af8144c0fb6c4890f43aca46a2440b12b491498081e8
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Size: 1.07 KB
Versions: 4
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Stored size: 1.07 KB
Contents
import "projection";
var hammerAzimuthalEqualArea = d3.geo.azimuthalEqualArea.raw;
function hammer(A, B) {
if (arguments.length < 2) B = A;
if (B === 1) return hammerAzimuthalEqualArea;
if (B === Infinity) return hammerQuarticAuthalic;
function forward(λ, φ) {
var coordinates = hammerAzimuthalEqualArea(λ / B, φ);
coordinates[0] *= A;
return coordinates;
}
forward.invert = function(x, y) {
var coordinates = hammerAzimuthalEqualArea.invert(x / A, y);
coordinates[0] *= B;
return coordinates;
};
return forward;
}
function hammerProjection() {
var B = 2,
m = projectionMutator(hammer),
p = m(B);
p.coefficient = function(_) {
if (!arguments.length) return B;
return m(B = +_);
};
return p;
}
function hammerQuarticAuthalic(λ, φ) {
return [
λ * Math.cos(φ) / Math.cos(φ /= 2),
2 * Math.sin(φ)
];
}
hammerQuarticAuthalic.invert = function(x, y) {
var φ = 2 * asin(y / 2);
return [
x * Math.cos(φ / 2) / Math.cos(φ),
φ
];
};
(d3.geo.hammer = hammerProjection).raw = hammer;
Version data entries
4 entries across 4 versions & 1 rubygems