| 1 | "use strict";
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| 2 |
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| 3 | Object.defineProperty(exports, "__esModule", {
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| 4 | value: true
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| 5 | });
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| 6 | exports.default = pow;
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| 7 | exports.powish = powish;
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| 8 | exports.sqrt = sqrt;
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| 9 | var _linear = require("./linear.js");
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| 10 | var _continuous = require("./continuous.js");
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| 11 | var _init = require("./init.js");
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| 12 | function transformPow(exponent) {
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| 13 | return function (x) {
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| 14 | return x < 0 ? -Math.pow(-x, exponent) : Math.pow(x, exponent);
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| 15 | };
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| 16 | }
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| 17 | function transformSqrt(x) {
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| 18 | return x < 0 ? -Math.sqrt(-x) : Math.sqrt(x);
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| 19 | }
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| 20 | function transformSquare(x) {
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| 21 | return x < 0 ? -x * x : x * x;
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| 22 | }
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| 23 | function powish(transform) {
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| 24 | var scale = transform(_continuous.identity, _continuous.identity),
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| 25 | exponent = 1;
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| 26 | function rescale() {
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| 27 | return exponent === 1 ? transform(_continuous.identity, _continuous.identity) : exponent === 0.5 ? transform(transformSqrt, transformSquare) : transform(transformPow(exponent), transformPow(1 / exponent));
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| 28 | }
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| 29 | scale.exponent = function (_) {
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| 30 | return arguments.length ? (exponent = +_, rescale()) : exponent;
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| 31 | };
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| 32 | return (0, _linear.linearish)(scale);
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| 33 | }
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| 34 | function pow() {
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| 35 | var scale = powish((0, _continuous.transformer)());
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| 36 | scale.copy = function () {
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| 37 | return (0, _continuous.copy)(scale, pow()).exponent(scale.exponent());
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| 38 | };
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| 39 | _init.initRange.apply(scale, arguments);
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| 40 | return scale;
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| 41 | }
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| 42 | function sqrt() {
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| 43 | return pow.apply(null, arguments).exponent(0.5);
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| 44 | } |
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