Sha256: 954dadbb6fa39bf72e49cafaa54b311c2b761e0f6aef357be537cb8333b9e90b
Contents?: true
Size: 678 Bytes
Versions: 4
Compression:
Stored size: 678 Bytes
Contents
import "projection";
import "parallel1";
function craig(φ0) {
var tanφ0 = Math.tan(φ0);
function forward(λ, φ) {
return [
λ,
(λ ? λ / Math.sin(λ) : 1) * (Math.sin(φ) * Math.cos(λ) - tanφ0 * Math.cos(φ))
];
}
forward.invert = tanφ0 ? function(x, y) {
if (x) y *= Math.sin(x) / x;
var cosλ = Math.cos(x);
return [
x,
2 * Math.atan2(Math.sqrt(cosλ * cosλ + tanφ0 * tanφ0 - y * y) - cosλ, tanφ0 - y)
];
} : function(x, y) {
return [
x,
asin(x ? y * Math.tan(x) / x : y)
];
};
return forward;
}
(d3.geo.craig = function() { return parallel1Projection(craig); }).raw = craig;
Version data entries
4 entries across 4 versions & 1 rubygems