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area-test.js
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import * as Plot from "@observablehq/plot";
import {curveLinear, curveStep} from "d3";
import assert from "assert";
it("area(data, options) has the expected defaults", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1"});
assert.strictEqual(area.data, undefined);
// assert.strictEqual(area.transform, undefined);
assert.deepStrictEqual(area.channels.map(c => c.name), ["x1", "y1"]);
assert.deepStrictEqual(area.channels.map(c => c.value), ["0", "1"]);
assert.deepStrictEqual(area.channels.map(c => c.scale), ["x", "y"]);
assert.strictEqual(area.curve, curveLinear);
assert.strictEqual(area.fill, undefined);
assert.strictEqual(area.fillOpacity, undefined);
assert.strictEqual(area.stroke, undefined);
assert.strictEqual(area.strokeWidth, undefined);
assert.strictEqual(area.strokeOpacity, undefined);
assert.strictEqual(area.strokeLinejoin, undefined);
assert.strictEqual(area.strokeLinecap, undefined);
assert.strictEqual(area.strokeMiterlimit, undefined);
assert.strictEqual(area.strokeDasharray, undefined);
assert.strictEqual(area.strokeDashoffset, undefined);
assert.strictEqual(area.mixBlendMode, undefined);
assert.strictEqual(area.shapeRendering, undefined);
});
it("area(data, {x1, y1, y2}) specifies an optional y2 channel", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", y2: "2"});
const y2 = area.channels.find(c => c.name === "y2");
assert.strictEqual(y2.value, "2");
assert.strictEqual(y2.scale, "y");
});
it("area(data, {x1, x2, y1}) specifies an optional x2 channel", () => {
const area = Plot.area(undefined, {x1: "0", x2: "1", y1: "2"});
const x2 = area.channels.find(c => c.name === "x2");
assert.strictEqual(x2.value, "1");
assert.strictEqual(x2.scale, "x");
});
it("area(data, {z}) specifies an optional z channel", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", z: "2"});
const z = area.channels.find(c => c.name === "z");
assert.strictEqual(z.value, "2");
assert.strictEqual(z.scale, undefined);
});
it("area(data, {title}) specifies an optional title channel", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", title: "2"});
const title = area.channels.find(c => c.name === "title");
assert.strictEqual(title.value, "2");
assert.strictEqual(title.scale, undefined);
});
it("area(data, {fill}) allows fill to be a constant color", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", fill: "red"});
assert.strictEqual(area.fill, "red");
});
it("area(data, {fill}) allows fill to be null", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", fill: null});
assert.strictEqual(area.fill, "none");
});
it("area(data, {fill}) allows fill to be a variable color", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", fill: "x"});
assert.strictEqual(area.fill, undefined);
const fill = area.channels.find(c => c.name === "fill");
assert.strictEqual(fill.value, "x");
assert.strictEqual(fill.scale, "color");
});
it("area(data, {fill}) implies a default z channel if fill is variable", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", fill: "2", stroke: "3"}); // fill takes priority
const z = area.channels.find(c => c.name === "z");
assert.strictEqual(z.value, "2");
assert.strictEqual(z.scale, undefined);
});
it("area(data, {stroke}) allows stroke to be a constant color", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", stroke: "red"});
assert.strictEqual(area.stroke, "red");
});
it("area(data, {stroke}) allows stroke to be null", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", stroke: null});
assert.strictEqual(area.stroke, undefined);
});
it("area(data, {stroke}) allows stroke to be a variable color", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", stroke: "x"});
assert.strictEqual(area.stroke, undefined);
const stroke = area.channels.find(c => c.name === "stroke");
assert.strictEqual(stroke.value, "x");
assert.strictEqual(stroke.scale, "color");
});
it("area(data, {stroke}) implies a default z channel if stroke is variable", () => {
const area = Plot.area(undefined, {x1: "0", y1: "1", stroke: "2"});
const z = area.channels.find(c => c.name === "z");
assert.strictEqual(z.value, "2");
assert.strictEqual(z.scale, undefined);
});
it("area(data, {curve}) specifies a named curve or function", () => {
assert.strictEqual(Plot.area(undefined, {x1: "0", y1: "1", curve: "step"}).curve, curveStep);
assert.strictEqual(Plot.area(undefined, {x1: "0", y1: "1", curve: curveStep}).curve, curveStep);
});
it("areaX(data, {x, y}) defaults x1 to zero, x2 to x, and y1 to y", () => {
const area = Plot.areaX(undefined, {x: "0", y: "1"});
const x1 = area.channels.find(c => c.name === "x1");
// assert.strictEqual(x1.value, 0);
assert.strictEqual(x1.scale, "x");
const x2 = area.channels.find(c => c.name === "x2");
assert.strictEqual(x2.value.label, "0");
assert.strictEqual(x2.scale, "x");
const y1 = area.channels.find(c => c.name === "y1");
assert.strictEqual(y1.value, "1");
assert.strictEqual(y1.scale, "y");
});
it("areaY(data, {x, y}) defaults x1 to x, y1 to zero, and y2 to y", () => {
const area = Plot.areaY(undefined, {x: "0", y: "1"});
const x1 = area.channels.find(c => c.name === "x1");
assert.strictEqual(x1.value, "0");
assert.strictEqual(x1.scale, "x");
const y1 = area.channels.find(c => c.name === "y1");
// assert.strictEqual(y1.value, 0);
assert.strictEqual(y1.scale, "y");
const y2 = area.channels.find(c => c.name === "y2");
assert.strictEqual(y2.value.label, "1");
assert.strictEqual(y2.scale, "y");
});