{"ast":null,"code":"var epsilon2 = 1e-12;\nfunction cosh(x) {\n  return ((x = Math.exp(x)) + 1 / x) / 2;\n}\nfunction sinh(x) {\n  return ((x = Math.exp(x)) - 1 / x) / 2;\n}\nfunction tanh(x) {\n  return ((x = Math.exp(2 * x)) - 1) / (x + 1);\n}\nexport default (function zoomRho(rho, rho2, rho4) {\n  // p0 = [ux0, uy0, w0]\n  // p1 = [ux1, uy1, w1]\n  function zoom(p0, p1) {\n    var ux0 = p0[0],\n      uy0 = p0[1],\n      w0 = p0[2],\n      ux1 = p1[0],\n      uy1 = p1[1],\n      w1 = p1[2],\n      dx = ux1 - ux0,\n      dy = uy1 - uy0,\n      d2 = dx * dx + dy * dy,\n      i,\n      S;\n\n    // Special case for u0 ≅ u1.\n    if (d2 < epsilon2) {\n      S = Math.log(w1 / w0) / rho;\n      i = function (t) {\n        return [ux0 + t * dx, uy0 + t * dy, w0 * Math.exp(rho * t * S)];\n      };\n    }\n\n    // General case.\n    else {\n      var d1 = Math.sqrt(d2),\n        b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),\n        b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),\n        r0 = Math.log(Math.sqrt(b0 * b0 + 1) - 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