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node_modules/d3-scale/src/radial.js

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+import continuous from "./continuous.js";
+import {initRange} from "./init.js";
+import {linearish} from "./linear.js";
+import number from "./number.js";
+
+function square(x) {
+  return Math.sign(x) * x * x;
+}
+
+function unsquare(x) {
+  return Math.sign(x) * Math.sqrt(Math.abs(x));
+}
+
+export default function radial() {
+  var squared = continuous(),
+      range = [0, 1],
+      round = false,
+      unknown;
+
+  function scale(x) {
+    var y = unsquare(squared(x));
+    return isNaN(y) ? unknown : round ? Math.round(y) : y;
+  }
+
+  scale.invert = function(y) {
+    return squared.invert(square(y));
+  };
+
+  scale.domain = function(_) {
+    return arguments.length ? (squared.domain(_), scale) : squared.domain();
+  };
+
+  scale.range = function(_) {
+    return arguments.length ? (squared.range((range = Array.from(_, number)).map(square)), scale) : range.slice();
+  };
+
+  scale.rangeRound = function(_) {
+    return scale.range(_).round(true);
+  };
+
+  scale.round = function(_) {
+    return arguments.length ? (round = !!_, scale) : round;
+  };
+
+  scale.clamp = function(_) {
+    return arguments.length ? (squared.clamp(_), scale) : squared.clamp();
+  };
+
+  scale.unknown = function(_) {
+    return arguments.length ? (unknown = _, scale) : unknown;
+  };
+
+  scale.copy = function() {
+    return radial(squared.domain(), range)
+        .round(round)
+        .clamp(squared.clamp())
+        .unknown(unknown);
+  };
+
+  initRange.apply(scale, arguments);
+
+  return linearish(scale);
+}