Sha256: 6567b710242456697ae4b7da296151808ccba4a1d5a7e8fd8ff7053e5ba53322
Contents?: true
Size: 499 Bytes
Versions: 4
Compression:
Stored size: 499 Bytes
Contents
function littrow(λ, φ) {
return [
Math.sin(λ) / Math.cos(φ),
Math.tan(φ) * Math.cos(λ)
];
}
littrow.invert = function(x, y) {
var x2 = x * x,
y2 = y * y,
y2_1 = y2 + 1,
cosφ = x
? Math.SQRT1_2 * Math.sqrt((y2_1 - Math.sqrt(x2 * x2 + 2 * x2 * (y2 - 1) + y2_1 * y2_1)) / x2 + 1)
: 1 / Math.sqrt(y2_1);
return [
asin(x * cosφ),
sgn(y) * acos(cosφ)
];
};
(d3.geo.littrow = function() { return projection(littrow); }).raw = littrow;
Version data entries
4 entries across 4 versions & 1 rubygems