Sha256: da7b2ad4b9b989e58bdf4a4cf2bb07ad3a3c57a20cac8df77a4ffdc235c0bcb1
Contents?: true
Size: 653 Bytes
Versions: 4
Compression:
Stored size: 653 Bytes
Contents
import "projection";
function mtFlatPolarParabolic(λ, φ) {
var sqrt6 = Math.sqrt(6),
sqrt7 = Math.sqrt(7),
θ = Math.asin(7 * Math.sin(φ) / (3 * sqrt6));
return [
sqrt6 * λ * (2 * Math.cos(2 * θ / 3) - 1) / sqrt7,
9 * Math.sin(θ / 3) / sqrt7
];
}
mtFlatPolarParabolic.invert = function(x, y) {
var sqrt6 = Math.sqrt(6),
sqrt7 = Math.sqrt(7),
θ = 3 * asin(y * sqrt7 / 9);
return [
x * sqrt7 / (sqrt6 * (2 * Math.cos(2 * θ / 3) - 1)),
asin(Math.sin(θ) * 3 * sqrt6 / 7)
];
};
(d3.geo.mtFlatPolarParabolic = function() { return projection(mtFlatPolarParabolic); }).raw = mtFlatPolarParabolic;
Version data entries
4 entries across 4 versions & 1 rubygems