Sha256: c8077952ffdf7e3dce7f520c048ea634dd3164cbc60ed4f964d12152f3d9f1f6
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Size: 561 Bytes
Versions: 5
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Stored size: 561 Bytes
Contents
// Abstract azimuthal projection.
function d3_geo_azimuthal(scale, angle) {
function azimuthal(λ, φ) {
var cosλ = Math.cos(λ),
cosφ = Math.cos(φ),
k = scale(cosλ * cosφ);
return [
k * cosφ * Math.sin(λ),
k * Math.sin(φ)
];
}
azimuthal.invert = function(x, y) {
var ρ = Math.sqrt(x * x + y * y),
c = angle(ρ),
sinc = Math.sin(c),
cosc = Math.cos(c);
return [
Math.atan2(x * sinc, ρ * cosc),
Math.asin(ρ && y * sinc / ρ)
];
};
return azimuthal;
}
Version data entries
5 entries across 5 versions & 3 rubygems