feat(interaction): emit brush axis highlight

__tests__/integration/api-chart-emit-brush-highlight-axis-cross.spec.ts

@@ -0,0 +1,69 @@
+import { chartEmitBrushHighlightAxisCross as render } from '../plots/api/chart-emit-brush-highlight-axis-cross';
+import { dblclick, brush } from '../plots/interaction/penguins-point-brush';
+import { AXIS_HOT_AREA_CLASS_NAME } from '../../src/interaction/brushAxisHighlight';
+import { createNodeGCanvas } from './utils/createNodeGCanvas';
+import { createPromise, getElementByClassName } from './utils/event';
+import { sleep } from './utils/sleep';
+import { kebabCase } from './utils/kebabCase';
+import './utils/useCustomFetch';
+import './utils/useSnapshotMatchers';
+
+describe('chart.on', () => {
+  const dir = `${__dirname}/snapshots/api/${kebabCase(render.name)}`;
+  const canvas = createNodeGCanvas(640, 480);
+
+  it('chart.emit("brushAxis:highlight", callback) should emit events.', async () => {
+    const { chart, finished } = render({
+      canvas,
+      container: document.createElement('div'),
+    });
+    await finished;
+    await sleep(20);
+
+    // chart.emit('brushAxis:highlight', options) should trigger slider.
+    chart.emit('brushAxis:highlight', {
+      data: {
+        selection: [
+          [40, 50],
+          [14, 18],
+        ],
+      },
+    });
+    await sleep(20);
+    await expect(canvas).toMatchCanvasSnapshot(dir, 'step0');
+
+    // chart.emit('brushAxis:remove', options) should reset.
+    chart.emit('brushAxis:remove', {});
+    await sleep(20);
+    await expect(canvas).toMatchCanvasSnapshot(dir, 'step1');
+
+    chart.off();
+
+    const axis = getElementByClassName(canvas, AXIS_HOT_AREA_CLASS_NAME);
+
+    // chart.on("brushAxis:highlight") should receive expected data.
+    const [highlight, resolveHighlight] = createPromise();
+    chart.on('brushAxis:highlight', (event) => {
+      if (!event.nativeEvent) return;
+      expect(event.data.selection).toEqual([]);
+      resolveHighlight();
+    });
+    brush(axis, -Infinity, 50, Infinity, 400);
+    await sleep(20);
+    await highlight;
+
+    // chart.on("brushAxis:remove") should be called.
+    const [remove, resolveRemove] = createPromise();
+    chart.on('brushAxis:remove', (event) => {
+      if (!event.nativeEvent) return;
+      resolveRemove();
+    });
+    dblclick(axis);
+    await sleep(20);
+    await remove;
+  });
+
+  afterAll(() => {
+    canvas?.destroy();
+  });
+});

__tests__/integration/api-chart-emit-brush-highlight-axis-horizontal.spec.ts

@@ -0,0 +1,72 @@
+import { chartEmitBrushHighlightAxisHorizontal as render } from '../plots/api/chart-emit-brush-highlight-axis-horizontal';
+import { dblclick, brush } from '../plots/interaction/penguins-point-brush';
+import { AXIS_HOT_AREA_CLASS_NAME } from '../../src/interaction/brushAxisHighlight';
+import { createNodeGCanvas } from './utils/createNodeGCanvas';
+import { createPromise, getElementByClassName } from './utils/event';
+import { sleep } from './utils/sleep';
+import { kebabCase } from './utils/kebabCase';
+import './utils/useCustomFetch';
+import './utils/useSnapshotMatchers';
+
+describe('chart.on', () => {
+  const dir = `${__dirname}/snapshots/api/${kebabCase(render.name)}`;
+  const canvas = createNodeGCanvas(640, 800);
+
+  it('chart.emit("brushAxis:highlight", callback) should emit events.', async () => {
+    const { chart, finished } = render({
+      canvas,
+      container: document.createElement('div'),
+    });
+    await finished;
+    await sleep(20);
+
+    // chart.emit('brushAxis:highlight', options) should trigger slider.
+    chart.emit('brushAxis:highlight', {
+      data: { selection: [[20, 30], undefined, [100, 300]] },
+    });
+    await sleep(20);
+    await expect(canvas).toMatchCanvasSnapshot(dir, 'step0');
+
+    // chart.emit('brushAxis:remove', options) should reset.
+    chart.emit('brushAxis:remove', {});
+    await sleep(20);
+    await expect(canvas).toMatchCanvasSnapshot(dir, 'step1');
+
+    chart.off();
+
+    const axis = getElementByClassName(canvas, AXIS_HOT_AREA_CLASS_NAME);
+
+    // chart.on("brushAxis:highlight") should receive expected data.
+    const [highlight, resolveHighlight] = createPromise();
+    chart.on('brushAxis:highlight', (event) => {
+      if (!event.nativeEvent) return;
+      expect(event.data.selection).toEqual([
+        [11, 33],
+        [3, 8],
+        [68, 455],
+        [46, 230],
+        [1613, 5140],
+        [8, 24.8],
+        [70, 82],
+      ]);
+      resolveHighlight();
+    });
+    brush(axis, 50, -Infinity, 400, Infinity);
+    await sleep(20);
+    await highlight;
+
+    // chart.on("brushAxis:remove") should be called.
+    const [remove, resolveRemove] = createPromise();
+    chart.on('brushAxis:remove', (event) => {
+      if (!event.nativeEvent) return;
+      resolveRemove();
+    });
+    dblclick(axis);
+    await sleep(20);
+    await remove;
+  });
+
+  afterAll(() => {
+    canvas?.destroy();
+  });
+});

__tests__/integration/api-chart-emit-brush-highlight-axis-vertical.spec.ts

@@ -0,0 +1,72 @@
+import { chartEmitBrushHighlightAxisVertical as render } from '../plots/api/chart-emit-brush-highlight-axis-vertical';
+import { dblclick, brush } from '../plots/interaction/penguins-point-brush';
+import { AXIS_HOT_AREA_CLASS_NAME } from '../../src/interaction/brushAxisHighlight';
+import { createNodeGCanvas } from './utils/createNodeGCanvas';
+import { createPromise, getElementByClassName } from './utils/event';
+import { sleep } from './utils/sleep';
+import { kebabCase } from './utils/kebabCase';
+import './utils/useCustomFetch';
+import './utils/useSnapshotMatchers';
+
+describe('chart.on', () => {
+  const dir = `${__dirname}/snapshots/api/${kebabCase(render.name)}`;
+  const canvas = createNodeGCanvas(640, 480);
+
+  it('chart.emit("brushAxis:highlight", callback) should emit events.', async () => {
+    const { chart, finished } = render({
+      canvas,
+      container: document.createElement('div'),
+    });
+    await finished;
+    await sleep(20);
+
+    // chart.emit('brushAxis:highlight', options) should trigger slider.
+    chart.emit('brushAxis:highlight', {
+      data: { selection: [[20, 30], undefined, [100, 300]] },
+    });
+    await sleep(20);
+    await expect(canvas).toMatchCanvasSnapshot(dir, 'step0');
+
+    // chart.emit('brushAxis:remove', options) should reset.
+    chart.emit('brushAxis:remove', {});
+    await sleep(20);
+    await expect(canvas).toMatchCanvasSnapshot(dir, 'step1');
+
+    chart.off();
+
+    const axis = getElementByClassName(canvas, AXIS_HOT_AREA_CLASS_NAME);
+
+    // chart.on("brushAxis:highlight") should receive expected data.
+    const [highlight, resolveHighlight] = createPromise();
+    chart.on('brushAxis:highlight', (event) => {
+      if (!event.nativeEvent) return;
+      expect(event.data.selection).toEqual([
+        [14, 44.6],
+        [3, 8],
+        [68, 455],
+        [46, 230],
+        [1613, 5140],
+        [8, 24.8],
+        [70, 82],
+      ]);
+      resolveHighlight();
+    });
+    brush(axis, -Infinity, 50, Infinity, 400);
+    await sleep(20);
+    await highlight;
+
+    // chart.on("brushAxis:remove") should be called.
+    const [remove, resolveRemove] = createPromise();
+    chart.on('brushAxis:remove', (event) => {
+      if (!event.nativeEvent) return;
+      resolveRemove();
+    });
+    dblclick(axis);
+    await sleep(20);
+    await remove;
+  });
+
+  afterAll(() => {
+    canvas?.destroy();
+  });
+});

__tests__/integration/utils/event.ts

@@ -44,3 +44,7 @@ export function dispatchFirstShapeEvent(canvas, className, event, params?) {
   const [shape] = canvas.document.getElementsByClassName(className);
   shape.dispatchEvent(new CustomEvent(event, params));
 }
+
+export function getElementByClassName(canvas, className) {
+  return canvas.document.getElementsByClassName(className)[0];
+}

__tests__/plots/api/chart-emit-brush-highlight-axis-cross.ts

@@ -0,0 +1,70 @@
+import { Chart } from '../../../src';
+
+export function chartEmitBrushHighlightAxisCross(context) {
+  const { container, canvas } = context;
+
+  // button
+  const button1 = document.createElement('button');
+  button1.innerText = 'Highlight';
+  container.appendChild(button1);
+
+  const button2 = document.createElement('button');
+  button2.innerText = 'Reset';
+  container.appendChild(button2);
+
+  // wrapperDiv
+  const wrapperDiv = document.createElement('div');
+  container.appendChild(wrapperDiv);
+
+  const chart = new Chart({
+    theme: 'classic',
+    container: wrapperDiv,
+    canvas,
+  });
+
+  chart.options({
+    type: 'point',
+    data: {
+      type: 'fetch',
+      value: 'data/penguins.csv',
+    },
+    encode: {
+      color: 'species',
+      x: 'culmen_length_mm',
+      y: 'culmen_depth_mm',
+    },
+    state: { inactive: { stroke: 'gray', opacity: 0.5 } },
+    interaction: {
+      brushAxisHighlight: true,
+    },
+  });
+
+  const finished = chart.render();
+
+  chart.on('brushAxis:highlight', (event) => {
+    const { data, nativeEvent } = event;
+    if (nativeEvent) console.log('brushAxis:highlight', data);
+  });
+
+  chart.on('brushAxis:remove', (event) => {
+    const { data, nativeEvent } = event;
+    if (nativeEvent) console.log('brushAxis:remove', data);
+  });
+
+  button1.onclick = () => {
+    chart.emit('brushAxis:highlight', {
+      data: {
+        selection: [
+          [40, 50],
+          [14, 18],
+        ],
+      },
+    });
+  };
+
+  button2.onclick = () => {
+    chart.emit('brushAxis:remove', {});
+  };
+
+  return { chart, finished };
+}