Function d3_sgn

explainshell/web/static/js/d3.v3.js:1284–1286

(x)

  }
  var π = Math.PI, ε = 1e-6, d3_radians = π / 180, d3_degrees = 180 / π;
  function d3_sgn(x) {
    return x > 0 ? 1 : x < 0 ? -1 : 0;
  }
  function d3_acos(x) {
    return Math.acos(Math.max(-1, Math.min(1, x)));
  }