diff --git a/src/scales.js b/src/scales.js
index ef76725ab7..2512b9b67c 100644
--- a/src/scales.js
+++ b/src/scales.js
@@ -2,6 +2,7 @@ import {registry, position, radius} from "./scales/index.js";
import {ScaleDiverging, ScaleLinear, ScalePow, ScaleLog, ScaleSymlog} from "./scales/quantitative.js";
import {ScaleTime, ScaleUtc} from "./scales/temporal.js";
import {ScaleOrdinal, ScalePoint, ScaleBand} from "./scales/ordinal.js";
+import {ScaleIdentity} from "./scales/identity.js";
export function Scales(channels, {inset, round, nice, align, padding, ...options} = {}) {
const scales = {};
@@ -43,6 +44,7 @@ function Scale(key, channels = [], options = {}) {
case "time": return ScaleTime(key, channels, options);
case "point": return ScalePoint(key, channels, options);
case "band": return ScaleBand(key, channels, options);
+ case "identity": return ScaleIdentity(key, channels, options);
case undefined: return;
default: throw new Error(`unknown scale type: ${options.type}`);
}
diff --git a/src/scales/identity.js b/src/scales/identity.js
new file mode 100644
index 0000000000..10a76f769e
--- /dev/null
+++ b/src/scales/identity.js
@@ -0,0 +1,21 @@
+import {scaleIdentity} from "d3-scale";
+import {ScaleO} from "./ordinal.js";
+import {ScaleQ} from "./quantitative.js";
+
+export function ScaleIdentity(key, channels, options) {
+ let type = "quantitative";
+ for (const c of channels) {
+ for (const v of c.value) {
+ if (typeof v === "string") {
+ type = "ordinal";
+ break;
+ }
+ }
+ }
+ switch (type) {
+ case "ordinal":
+ return ScaleO(Object.assign(x => x, { domain: () => {} }), channels, options);
+ case "quantitative":
+ return ScaleQ(key, scaleIdentity(), channels, options);
+ }
+}
diff --git a/test/identity-scale-test.html b/test/identity-scale-test.html
new file mode 100644
index 0000000000..7ae033ab76
--- /dev/null
+++ b/test/identity-scale-test.html
@@ -0,0 +1,28 @@
+
+
+
+
+
+