105 lines
2.8 KiB
JavaScript
105 lines
2.8 KiB
JavaScript
import {interpolate, interpolateRound, piecewise} from "d3-interpolate";
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import {identity} from "./continuous.js";
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import {initInterpolator} from "./init.js";
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import {linearish} from "./linear.js";
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import {loggish} from "./log.js";
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import {copy} from "./sequential.js";
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import {symlogish} from "./symlog.js";
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import {powish} from "./pow.js";
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function transformer() {
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var x0 = 0,
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x1 = 0.5,
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x2 = 1,
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s = 1,
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t0,
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t1,
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t2,
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k10,
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k21,
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interpolator = identity,
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transform,
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clamp = false,
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unknown;
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function scale(x) {
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return isNaN(x = +x) ? unknown : (x = 0.5 + ((x = +transform(x)) - t1) * (s * x < s * t1 ? k10 : k21), interpolator(clamp ? Math.max(0, Math.min(1, x)) : x));
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}
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scale.domain = function(_) {
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return arguments.length ? ([x0, x1, x2] = _, t0 = transform(x0 = +x0), t1 = transform(x1 = +x1), t2 = transform(x2 = +x2), k10 = t0 === t1 ? 0 : 0.5 / (t1 - t0), k21 = t1 === t2 ? 0 : 0.5 / (t2 - t1), s = t1 < t0 ? -1 : 1, scale) : [x0, x1, x2];
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};
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scale.clamp = function(_) {
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return arguments.length ? (clamp = !!_, scale) : clamp;
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};
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scale.interpolator = function(_) {
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return arguments.length ? (interpolator = _, scale) : interpolator;
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};
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function range(interpolate) {
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return function(_) {
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var r0, r1, r2;
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return arguments.length ? ([r0, r1, r2] = _, interpolator = piecewise(interpolate, [r0, r1, r2]), scale) : [interpolator(0), interpolator(0.5), interpolator(1)];
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};
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}
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scale.range = range(interpolate);
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scale.rangeRound = range(interpolateRound);
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scale.unknown = function(_) {
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return arguments.length ? (unknown = _, scale) : unknown;
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};
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return function(t) {
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transform = t, t0 = t(x0), t1 = t(x1), t2 = t(x2), k10 = t0 === t1 ? 0 : 0.5 / (t1 - t0), k21 = t1 === t2 ? 0 : 0.5 / (t2 - t1), s = t1 < t0 ? -1 : 1;
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return scale;
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};
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}
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export default function diverging() {
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var scale = linearish(transformer()(identity));
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scale.copy = function() {
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return copy(scale, diverging());
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};
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return initInterpolator.apply(scale, arguments);
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}
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export function divergingLog() {
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var scale = loggish(transformer()).domain([0.1, 1, 10]);
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scale.copy = function() {
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return copy(scale, divergingLog()).base(scale.base());
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};
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return initInterpolator.apply(scale, arguments);
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}
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export function divergingSymlog() {
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var scale = symlogish(transformer());
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scale.copy = function() {
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return copy(scale, divergingSymlog()).constant(scale.constant());
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};
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return initInterpolator.apply(scale, arguments);
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}
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export function divergingPow() {
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var scale = powish(transformer());
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scale.copy = function() {
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return copy(scale, divergingPow()).exponent(scale.exponent());
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};
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return initInterpolator.apply(scale, arguments);
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}
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export function divergingSqrt() {
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return divergingPow.apply(null, arguments).exponent(0.5);
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}
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