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Contents
// @import parallel1
function loximuthal(φ0) {
var cosφ0 = Math.cos(φ0),
tanφ0 = Math.tan(π / 4 + φ0 / 2);
function forward(λ, φ) {
var y = φ - φ0,
x = Math.abs(y) < ε ? λ * cosφ0
: Math.abs(x = π / 4 + φ / 2) < ε || Math.abs(Math.abs(x) - π / 2) < ε
? 0 : λ * y / Math.log(Math.tan(x) / tanφ0);
return [x, y];
}
forward.invert = function(x, y) {
var λ,
φ = y + φ0;
return [
Math.abs(y) < ε ? x / cosφ0
: (Math.abs(λ = π / 4 + φ / 2) < ε || Math.abs(Math.abs(λ) - π / 2) < ε) ? 0
: x * Math.log(Math.tan(λ) / tanφ0) / y,
φ
];
};
return forward;
}
(d3.geo.loximuthal = function() { return parallel1Projection(loximuthal).parallel(40); }).raw = loximuthal;
Version data entries
4 entries across 4 versions & 1 rubygems