JAVASCRIPT log.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = log;
exports.loggish = loggish;
var _index = require("../../../lib-vendor/d3-array/src/index.js");
var _index2 = require("../../../lib-vendor/d3-format/src/index.js");
var _nice = _interopRequireDefault(require("./nice.js"));
var _continuous = require("./continuous.js");
var _init = require("./init.js");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function transformLog(x) {
  return Math.log(x);
}
function transformExp(x) {
  return Math.exp(x);
}
function transformLogn(x) {
  return -Math.log(-x);
}
function transformExpn(x) {
  return -Math.exp(-x);
}
function pow10(x) {
  return isFinite(x) ? +("1e" + x) : x < 0 ? 0 : x;
}
function powp(base) {
  return base === 10 ? pow10 : base === Math.E ? Math.exp : x => Math.pow(base, x);
}
function logp(base) {
  return base === Math.E ? Math.log : base === 10 && Math.log10 || base === 2 && Math.log2 || (base = Math.log(base), x => Math.log(x) / base);
}
function reflect(f) {
  return (x, k) => -f(-x, k);
}
function loggish(transform) {
  const scale = transform(transformLog, transformExp);
  const domain = scale.domain;
  let base = 10;
  let logs;
  let pows;
  function rescale() {
    logs = logp(base), pows = powp(base);
    if (domain()[0] < 0) {
      logs = reflect(logs), pows = reflect(pows);
      transform(transformLogn, transformExpn);
    } else {
      transform(transformLog, transformExp);
    }
    return scale;
  }
  scale.base = function (_) {
    return arguments.length ? (base = +_, rescale()) : base;
  };
  scale.domain = function (_) {
    return arguments.length ? (domain(_), rescale()) : domain();
  };
  scale.ticks = count => {
    const d = domain();
    let u = d[0];
    let v = d[d.length - 1];
    const r = v < u;
    if (r) [u, v] = [v, u];
    let i = logs(u);
    let j = logs(v);
    let k;
    let t;
    const n = count == null ? 10 : +count;
    let z = [];
    if (!(base % 1) && j - i < n) {
      i = Math.floor(i), j = Math.ceil(j);
      if (u > 0) for (; i <= j; ++i) {
        for (k = 1; k < base; ++k) {
          t = i < 0 ? k / pows(-i) : k * pows(i);
          if (t < u) continue;
          if (t > v) break;
          z.push(t);
        }
      } else for (; i <= j; ++i) {
        for (k = base - 1; k >= 1; --k) {
          t = i > 0 ? k / pows(-i) : k * pows(i);
          if (t < u) continue;
          if (t > v) break;
          z.push(t);
        }
      }
      if (z.length * 2 < n) z = (0, _index.ticks)(u, v, n);
    } else {
      z = (0, _index.ticks)(i, j, Math.min(j - i, n)).map(pows);
    }
    return r ? z.reverse() : z;
  };
  scale.tickFormat = (count, specifier) => {
    if (count == null) count = 10;
    if (specifier == null) specifier = base === 10 ? "s" : ",";
    if (typeof specifier !== "function") {
      if (!(base % 1) && (specifier = (0, _index2.formatSpecifier)(specifier)).precision == null) specifier.trim = true;
      specifier = (0, _index2.format)(specifier);
    }
    if (count === Infinity) return specifier;
    const k = Math.max(1, base * count / scale.ticks().length); // TODO fast estimate?
    return d => {
      let i = d / pows(Math.round(logs(d)));
      if (i * base < base - 0.5) i *= base;
      return i <= k ? specifier(d) : "";
    };
  };
  scale.nice = () => {
    return domain((0, _nice.default)(domain(), {
      floor: x => pows(Math.floor(logs(x))),
      ceil: x => pows(Math.ceil(logs(x)))
    }));
  };
  return scale;
}
function log() {
  const scale = loggish((0, _continuous.transformer)()).domain([1, 10]);
  scale.copy = () => (0, _continuous.copy)(scale, log()).base(scale.base());
  _init.initRange.apply(scale, arguments);
  return scale;
}