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no ramp legend for continuous scales with a degenerate domain #2211

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no ramp legend for continuous scales with a degenerate domain #2211

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1 change: 1 addition & 0 deletions src/legends.js
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,7 @@ function legendColor(color, {legend = true, ...options}) {
case "swatches":
return legendSwatches(color, options);
case "ramp":
if (color.domain.length < 2) return;
return legendRamp(color, options);
default:
throw new Error(`unknown legend type: ${legend}`);
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5 changes: 5 additions & 0 deletions test/legend-test.js
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Expand Up @@ -6,6 +6,11 @@ it(`Plot.legend({color: {type: "identity"}}) returns undefined`, () => {
assert.strictEqual(Plot.legend({color: {type: "identity"}}), undefined);
});

it(`Plot.legend({color: {domain: [x?]}}) returns undefined`, () => {
assert.strictEqual(Plot.legend({color: {domain: []}}), undefined);
assert.strictEqual(Plot.legend({color: {domain: [1]}}), undefined);
});

it(`Plot.legend({legend: "swatches", color: {type: "<not-ordinal>"}}) throws an error`, () => {
assert.throws(() => Plot.legend({legend: "swatches", color: {type: "linear"}}), /swatches legend requires ordinal/);
assert.throws(() => Plot.legend({legend: "swatches", color: {type: "linear"}}), /\(not linear\)/);
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