Function compose

external/.d3.js:10340–10351

(a, b)

}

function compose(a, b) {

  function compose(x, y) {
    return x = a(x, y), b(x[0], x[1]);
  }

  if (a.invert && b.invert) compose.invert = function(x, y) {
    return x = b.invert(x, y), x && a.invert(x[0], x[1]);
  };

  return compose;
}

function rotationIdentity(lambda, phi) {
  if (abs$1(lambda) > pi$1) lambda -= Math.round(lambda / tau$1) * tau$1;