# Tornado

Compare two groups on opposite sides of a center line.

Canonical: https://chart.syidax.com/docs/components/tornado/

<a id="overview"></a>

## sy-tornado-chart

Use for two groups with shared categories, such as age bands or products.

The two sides separate direction. Do not arbitrarily negate the input values.

Base chart tier: Community. Features such as additional renderers and custom branding have separate entitlement requirements.

| Input | Data description |
| --- | --- |
| `data` | An array of { category, values: [left, right] }. |
| `color` | Set group colors as [left, right]. |
| `groups` | Names for the two groups. |

- [Run in Components](https://chart.syidax.com/charts/tornado) — Change options and view framework-specific code
- [Shared installation and integration](https://chart.syidax.com/docs/getting-started.md)

<a id="example"></a>

## Complete implementation example

```html
<div id="chart-container" style="width: 100%; min-width: 0;"></div>

<script type="module">
  import { defineCustomElement as define0 } from '@syidax/advanced/components/sy-tornado-chart.js';
  define0();

  const specs = [
    {
      "id": "example-chart",
      "tag": "sy-tornado-chart",
      "props": {
        "engine": "standard",
        "data": [
          {
            "category": "20s",
            "values": [35, 42]
          },
          {
            "category": "30s",
            "values": [52, 48]
          },
          {
            "category": "40s",
            "values": [41, 36]
          },
          {
            "category": "50s",
            "values": [28, 32]
          }
        ],
        "width": 640,
        "height": 360,
        "brandPosition": "bottom-right",
        "brandLogo": ""
      }
    }
  ];
  const container = document.querySelector('#chart-container');
  const elements = specs.map(({ tag, id, props }) => {
    const element = document.createElement(tag);
    element.id = id;
    Object.assign(element, props);
    element.setAttribute('aria-label', 'tornado example chart');
    return element;
  });
  container.replaceChildren(...elements);
  const chart = elements.at(-1);
  const onEvent = event => {
    console.log('pointClick', event.detail);
  };
  chart.addEventListener('pointClick', onEvent);
  const observer = new ResizeObserver(([entry]) => {
    const width = Math.max(160, Math.floor(entry.contentRect.width));
    elements.forEach(element => { element.width = width; });
  });
  observer.observe(container);

  // In an SPA, call this function when the view is disposed.
  function disposeChart() {
    observer.disconnect();
    chart.removeEventListener('pointClick', onEvent);
    container.replaceChildren();
  }
</script>
```

<a id="props"></a>

## Properties

<a id="property-data"></a>

### data

An array of { category, values: [left, right] }.

| Item | Value |
| --- | --- |
| JavaScript property | `data` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `ReadonlyArray<TornadoDatum>` |
| Default | `[]` |

- [TornadoDatum](https://chart.syidax.com/docs/types/TornadoDatum.md) — Type definition

<a id="property-groups"></a>

### groups

Names for the two groups.

| Item | Value |
| --- | --- |
| JavaScript property | `groups` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `ReadonlyArray<string>` |
| Default | `[]` |

<a id="property-categories"></a>

### categories

Pass as a JavaScript property. type: ReadonlyArray<string>.

| Item | Value |
| --- | --- |
| JavaScript property | `categories` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `ReadonlyArray<string>` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-leftValues"></a>

### leftValues

Deprecated fallback: prefer `data` + `groups`, matching dot-plot.

| Item | Value |
| --- | --- |
| JavaScript property | `leftValues` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `TornadoChartValues` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [TornadoChartValues](https://chart.syidax.com/docs/types/TornadoChartValues.md) — Type definition

<a id="property-rightValues"></a>

### rightValues

Deprecated fallback: prefer `data` + `groups`, matching dot-plot.

| Item | Value |
| --- | --- |
| JavaScript property | `rightValues` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `TornadoChartValues` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [TornadoChartValues](https://chart.syidax.com/docs/types/TornadoChartValues.md) — Type definition

<a id="property-width"></a>

### width

Chart width in pixels. If the container width changes, update width from a ResizeObserver.

| Item | Value |
| --- | --- |
| JavaScript property | `width` |
| HTML attribute | `width` |
| Type | `number` |
| Default | `680` |

<a id="property-height"></a>

### height

Chart height in pixels. Allow space for axes, titles, and the legend.

| Item | Value |
| --- | --- |
| JavaScript property | `height` |
| HTML attribute | `height` |
| Type | `number` |
| Default | `380` |

<a id="property-brandLogo"></a>

### brandLogo

The default is the Syidax symbol and wordmark. With the Pro chart.branding entitlement, set none to remove it or provide a PNG, JPEG, or WebP data URL to replace it.

| Item | Value |
| --- | --- |
| JavaScript property | `brandLogo` |
| HTML attribute | `brand-logo` |
| Type | `string` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-brandPosition"></a>

### brandPosition

The corner where the logo is anchored. Community and Pro both support all four corners, using the same position on screen and in image exports.

| Item | Value |
| --- | --- |
| JavaScript property | `brandPosition` |
| HTML attribute | `brand-position` |
| Type | `'top-left' \| 'top-right' \| 'bottom-left' \| 'bottom-right'` |
| Default | `'bottom-right'` |
| Allowed values | `top-left`, `top-right`, `bottom-left`, `bottom-right` |

<a id="property-color"></a>

### color

Set group colors as [left, right].

| Item | Value |
| --- | --- |
| JavaScript property | `color` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `string \| ReadonlyArray<string>` |
| Default | `''` |

<a id="property-leftLabel"></a>

### leftLabel

Deprecated fallback: prefer `groups[0]`.

| Item | Value |
| --- | --- |
| JavaScript property | `leftLabel` |
| HTML attribute | `left-label` |
| Type | `string` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-rightLabel"></a>

### rightLabel

Deprecated fallback: prefer `groups[1]`.

| Item | Value |
| --- | --- |
| JavaScript property | `rightLabel` |
| HTML attribute | `right-label` |
| Type | `string` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-barPadding"></a>

### barPadding

Vertical gap between bars as a fraction of each band (0..0.6).

| Item | Value |
| --- | --- |
| JavaScript property | `barPadding` |
| HTML attribute | `bar-padding` |
| Type | `number` |
| Default | `0.3` |

<a id="property-xLabelMode"></a>

### xLabelMode

How crowded category-axis labels are decluttered. Default 'auto' thins labels horizontally.

| Item | Value |
| --- | --- |
| JavaScript property | `xLabelMode` |
| HTML attribute | `x-label-mode` |
| Type | `'auto' \| 'all' \| 'thin' \| 'rotate' \| 'none'` |
| Default | `undefined` |
| Allowed values | `none`, `auto`, `all`, `thin`, `rotate` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-xLabelRotation"></a>

### xLabelRotation

Explicit category-label rotation in degrees (respected as a floor).

| Item | Value |
| --- | --- |
| JavaScript property | `xLabelRotation` |
| HTML attribute | `x-label-rotation` |
| Type | `number` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-xLabelMaxCount"></a>

### xLabelMaxCount

Hard cap on the number of category labels shown.

| Item | Value |
| --- | --- |
| JavaScript property | `xLabelMaxCount` |
| HTML attribute | `x-label-max` |
| Type | `number` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-valueAxisLabel"></a>

### valueAxisLabel

Set as an HTML attribute or JavaScript property. type: string.

| Item | Value |
| --- | --- |
| JavaScript property | `valueAxisLabel` |
| HTML attribute | `value-axis-label` |
| Type | `string` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-gridLines"></a>

### gridLines

Allowed values: auto, off. Default: undefined.

| Item | Value |
| --- | --- |
| JavaScript property | `gridLines` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `CartesianGridLinesInput` |
| Default | `undefined` |
| Literals in the type | `auto`, `off` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [CartesianGridLinesInput](https://chart.syidax.com/docs/types/CartesianGridLinesInput.md) — Type definition

<a id="property-crosshair"></a>

### crosshair

Crosshair that follows the cursor across the plot. `true`/`'auto'` enables a snapping line; pass an object to set mode/snap/color/dash.

| Item | Value |
| --- | --- |
| JavaScript property | `crosshair` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `CartesianCrosshairInput` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [CartesianCrosshairInput](https://chart.syidax.com/docs/types/CartesianCrosshairInput.md) — Type definition

<a id="property-chartTitle"></a>

### chartTitle

The title inside the chart. Explain the data's unit and meaning alongside it.

| Item | Value |
| --- | --- |
| JavaScript property | `chartTitle` |
| HTML attribute | `chart-title` |
| Type | `string` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-chartSubtitle"></a>

### chartSubtitle

The subtitle inside the chart.

| Item | Value |
| --- | --- |
| JavaScript property | `chartSubtitle` |
| HTML attribute | `chart-subtitle` |
| Type | `string` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-tooltipEnabled"></a>

### tooltipEnabled

Set as an HTML attribute or JavaScript property. type: boolean.

| Item | Value |
| --- | --- |
| JavaScript property | `tooltipEnabled` |
| HTML attribute | `tooltip-show` |
| Type | `boolean` |
| Default | `true` |

<a id="property-tooltipFormat"></a>

### tooltipFormat

Pass as a JavaScript property. type: (detail: TornadoChartPointerEventDetail) => string.

| Item | Value |
| --- | --- |
| JavaScript property | `tooltipFormat` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `(detail: TornadoChartPointerEventDetail) => string` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [TornadoChartPointerEventDetail](https://chart.syidax.com/docs/types/TornadoChartPointerEventDetail.md) — Type definition

<a id="property-tooltip"></a>

### tooltip

Rich tooltip configuration (matches the line/area/column/lollipop family). Pass an object to set `show`/`mode`/`side`/`format`/`html`/`style`/`connector`/`draggable`/`interactive`/`trigger`/`openMode`. The legacy `tooltipEnabled`/`tooltipFormat` props remain the fallback when `tooltip` is omitted.

| Item | Value |
| --- | --- |
| JavaScript property | `tooltip` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `CartesianTooltipInput` |
| Default | `undefined` |
| Literals in the type | `auto`, `off` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [CartesianTooltipInput](https://chart.syidax.com/docs/types/CartesianTooltipInput.md) — Type definition

<a id="property-enableMouseTracking"></a>

### enableMouseTracking

Set as an HTML attribute or JavaScript property. type: boolean.

| Item | Value |
| --- | --- |
| JavaScript property | `enableMouseTracking` |
| HTML attribute | `enable-mouse-tracking` |
| Type | `boolean` |
| Default | `true` |

<a id="property-animated"></a>

### animated

Whether to animate initial display and data changes.

| Item | Value |
| --- | --- |
| JavaScript property | `animated` |
| HTML attribute | `animate` |
| Type | `boolean` |
| Default | `false` |

<a id="property-animationDuration"></a>

### animationDuration

Animation duration in milliseconds.

| Item | Value |
| --- | --- |
| JavaScript property | `animationDuration` |
| HTML attribute | `animation-duration` |
| Type | `number` |
| Default | `600` |

<a id="property-animationEasing"></a>

### animationEasing

Allowed values: linear, ease-out, ease-in, ease-in-out. Default: 'ease-out'.

| Item | Value |
| --- | --- |
| JavaScript property | `animationEasing` |
| HTML attribute | `animation-easing` |
| Type | `TornadoChartEasing` |
| Default | `'ease-out'` |
| Allowed values | `linear`, `ease-out`, `ease-in`, `ease-in-out` |

- [TornadoChartEasing](https://chart.syidax.com/docs/types/TornadoChartEasing.md) — Type definition

<a id="property-animationType"></a>

### animationType

Allowed values: initial, update. Default: undefined.

| Item | Value |
| --- | --- |
| JavaScript property | `animationType` |
| HTML attribute | `animation-type` |
| Type | `TornadoChartAnimationType` |
| Default | `undefined` |
| Allowed values | `initial`, `update` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [TornadoChartAnimationType](https://chart.syidax.com/docs/types/TornadoChartAnimationType.md) — Type definition

<a id="property-streamSource"></a>

### streamSource

A stream source for live data. Check the contract for the specific type.

| Item | Value |
| --- | --- |
| JavaScript property | `streamSource` |
| HTML attribute | Pass objects, arrays, and callbacks as JavaScript properties |
| Type | `TornadoChartStreamSource` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [TornadoChartStreamSource](https://chart.syidax.com/docs/types/TornadoChartStreamSource.md) — Type definition

<a id="property-streamWindow"></a>

### streamWindow

The streaming data range to keep visible.

| Item | Value |
| --- | --- |
| JavaScript property | `streamWindow` |
| HTML attribute | `stream-window` |
| Type | `number` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-streamMax"></a>

### streamMax

The maximum number of streaming data points to retain.

| Item | Value |
| --- | --- |
| JavaScript property | `streamMax` |
| HTML attribute | `stream-max` |
| Type | `number` |
| Default | `undefined` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

<a id="property-engine"></a>

### engine

Renderer selection: auto, standard, or pro. Engine selection is separate from permission to use a Pro chart type.

| Item | Value |
| --- | --- |
| JavaScript property | `engine` |
| HTML attribute | `engine` |
| Type | `TornadoChartEngineMode` |
| Default | `'auto'` |
| Allowed values | `auto`, `standard`, `pro` |

- [TornadoChartEngineMode](https://chart.syidax.com/docs/types/TornadoChartEngineMode.md) — Type definition

<a id="property-proThreshold"></a>

### proThreshold

Set as an HTML attribute or JavaScript property. type: number.

| Item | Value |
| --- | --- |
| JavaScript property | `proThreshold` |
| HTML attribute | `pro-threshold` |
| Type | `number` |
| Default | `50_000` |

<a id="property-unavailable"></a>

### unavailable

Allowed values: fallback, error, throw. Default: 'fallback'.

| Item | Value |
| --- | --- |
| JavaScript property | `unavailable` |
| HTML attribute | `unavailable` |
| Type | `TornadoChartUnavailableBehaviour` |
| Default | `'fallback'` |
| Allowed values | `fallback`, `error`, `throw` |

- [TornadoChartUnavailableBehaviour](https://chart.syidax.com/docs/types/TornadoChartUnavailableBehaviour.md) — Type definition

<a id="events"></a>

## Events

<a id="event-rendered"></a>

### rendered

Emits rendering results in detail when chart drawing completes.

Event name: `rendered`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<TornadoChartRenderResult & { tier: TornadoChartEngineTier }>`.

```javascript
chart.addEventListener('rendered', event => {
  console.log(event.detail); // TornadoChartRenderResult & { tier: TornadoChartEngineTier }
});
```

- [TornadoChartRenderResult](https://chart.syidax.com/docs/types/TornadoChartRenderResult.md) — Type definition
- [TornadoChartEngineTier](https://chart.syidax.com/docs/types/TornadoChartEngineTier.md) — Type definition

<a id="event-pointClick"></a>

### pointClick

A point selection event. Read the selected data and index from CustomEvent.detail.

Event name: `pointClick`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<TornadoChartPointerEventDetail>`.

```javascript
chart.addEventListener('pointClick', event => {
  console.log(event.detail); // TornadoChartPointerEventDetail
});
```

- [TornadoChartPointerEventDetail](https://chart.syidax.com/docs/types/TornadoChartPointerEventDetail.md) — Type definition

<a id="event-pointHover"></a>

### pointHover

CustomEvent.detail type: TornadoChartPointerEventDetail | null. Event names are case-sensitive.

Event name: `pointHover`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<TornadoChartPointerEventDetail | null>`.

```javascript
chart.addEventListener('pointHover', event => {
  console.log(event.detail); // TornadoChartPointerEventDetail | null
});
```

- [TornadoChartPointerEventDetail](https://chart.syidax.com/docs/types/TornadoChartPointerEventDetail.md) — Type definition

<a id="event-crosshairMove"></a>

### crosshairMove

CustomEvent.detail type: CartesianCrosshairEventDetail | null. Event names are case-sensitive.

Event name: `crosshairMove`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<CartesianCrosshairEventDetail | null>`.

```javascript
chart.addEventListener('crosshairMove', event => {
  console.log(event.detail); // CartesianCrosshairEventDetail | null
});
```

- [CartesianCrosshairEventDetail](https://chart.syidax.com/docs/types/CartesianCrosshairEventDetail.md) — Type definition

<a id="event-pointContextMenu"></a>

### pointContextMenu

CustomEvent.detail type: ChartPointContextMenuEventDetail<TornadoChartPointerEventDetail>. Event names are case-sensitive.

Event name: `pointContextMenu`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<ChartPointContextMenuEventDetail<TornadoChartPointerEventDetail>>`.

```javascript
chart.addEventListener('pointContextMenu', event => {
  console.log(event.detail); // ChartPointContextMenuEventDetail<TornadoChartPointerEventDetail>
});
```

- [ChartPointContextMenuEventDetail](https://chart.syidax.com/docs/types/ChartPointContextMenuEventDetail.md) — Type definition
- [TornadoChartPointerEventDetail](https://chart.syidax.com/docs/types/TornadoChartPointerEventDetail.md) — Type definition

<a id="event-appended"></a>

### appended

CustomEvent.detail type: { count: number }. Event names are case-sensitive.

Event name: `appended`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<{ count: number }>`.

```javascript
chart.addEventListener('appended', event => {
  console.log(event.detail); // { count: number }
});
```

<a id="event-windowSlid"></a>

### windowSlid

CustomEvent.detail type: { dropped: number }. Event names are case-sensitive.

Event name: `windowSlid`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<{ dropped: number }>`.

```javascript
chart.addEventListener('windowSlid', event => {
  console.log(event.detail); // { dropped: number }
});
```

<a id="event-chartAnimationStart"></a>

### chartAnimationStart

CustomEvent.detail type: void. Event names are case-sensitive.

Event name: `chartAnimationStart`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<void>`.

```javascript
chart.addEventListener('chartAnimationStart', event => {
  console.log(event.detail); // void
});
```

<a id="event-chartAnimationEnd"></a>

### chartAnimationEnd

CustomEvent.detail type: void. Event names are case-sensitive.

Event name: `chartAnimationEnd`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<void>`.

```javascript
chart.addEventListener('chartAnimationEnd', event => {
  console.log(event.detail); // void
});
```

<a id="event-chartAnimationInterrupted"></a>

### chartAnimationInterrupted

CustomEvent.detail type: void. Event names are case-sensitive.

Event name: `chartAnimationInterrupted`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<void>`.

```javascript
chart.addEventListener('chartAnimationInterrupted', event => {
  console.log(event.detail); // void
});
```

<a id="event-tooltipShow"></a>

### tooltipShow

Whether to display the built-in tooltip.

Event name: `tooltipShow`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<CartesianTooltipEventDetail>`.

```javascript
chart.addEventListener('tooltipShow', event => {
  console.log(event.detail); // CartesianTooltipEventDetail
});
```

- [CartesianTooltipEventDetail](https://chart.syidax.com/docs/types/CartesianTooltipEventDetail.md) — Type definition

<a id="event-tooltipHide"></a>

### tooltipHide

CustomEvent.detail type: void. Event names are case-sensitive.

Event name: `tooltipHide`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<void>`.

```javascript
chart.addEventListener('tooltipHide', event => {
  console.log(event.detail); // void
});
```

<a id="event-tooltipAction"></a>

### tooltipAction

CustomEvent.detail type: CartesianTooltipActionEventDetail. Event names are case-sensitive.

Event name: `tooltipAction`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<CartesianTooltipActionEventDetail>`.

```javascript
chart.addEventListener('tooltipAction', event => {
  console.log(event.detail); // CartesianTooltipActionEventDetail
});
```

- [CartesianTooltipActionEventDetail](https://chart.syidax.com/docs/types/CartesianTooltipActionEventDetail.md) — Type definition

<a id="event-seriesOutsideClick"></a>

### seriesOutsideClick

CustomEvent.detail type: CartesianSeriesOutsideClickEventDetail. Event names are case-sensitive.

Event name: `seriesOutsideClick`. Names are case-sensitive. Read the payload from `detail` on `CustomEvent<CartesianSeriesOutsideClickEventDetail>`.

```javascript
chart.addEventListener('seriesOutsideClick', event => {
  console.log(event.detail); // CartesianSeriesOutsideClickEventDetail
});
```

- [CartesianSeriesOutsideClickEventDetail](https://chart.syidax.com/docs/types/CartesianSeriesOutsideClickEventDetail.md) — Type definition

<a id="methods"></a>

## Methods

<a id="method-redraw"></a>

### redraw

Redraw the chart using its current data and options. Inspect the rendered result after the returned Promise resolves.

```typescript
redraw(): Promise<TornadoChartRenderResult>
```

Return type: `Promise<TornadoChartRenderResult>`. Call the method after element registration and await its Promise result.

- [TornadoChartRenderResult](https://chart.syidax.com/docs/types/TornadoChartRenderResult.md) — Type definition

<a id="method-getActiveTier"></a>

### getActiveTier

An asynchronous method. Check the argument and return types below.

```typescript
getActiveTier(): Promise<TornadoChartEngineTier>
```

Return type: `Promise<TornadoChartEngineTier>`. Call the method after element registration and await its Promise result.

- [TornadoChartEngineTier](https://chart.syidax.com/docs/types/TornadoChartEngineTier.md) — Type definition

<a id="method-setData"></a>

### setData

Replace the bar set.

```typescript
setData(data: ReadonlyArray<TornadoDatum> | TornadoChartValues, rightValues?: TornadoChartValues): Promise<void>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `data` | `ReadonlyArray<TornadoDatum> \| TornadoChartValues` | Required |
| `rightValues` | `TornadoChartValues` | Optional |

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

- [TornadoDatum](https://chart.syidax.com/docs/types/TornadoDatum.md) — Type definition
- [TornadoChartValues](https://chart.syidax.com/docs/types/TornadoChartValues.md) — Type definition

<a id="method-appendPoint"></a>

### appendPoint

Append one value to the stream. Check the argument type and the licensing requirements for streaming.

```typescript
appendPoint(datum: TornadoRowDatum): Promise<void>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `datum` | `TornadoRowDatum` | Required |

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

- [TornadoRowDatum](https://chart.syidax.com/docs/types/TornadoRowDatum.md) — Type definition

<a id="method-appendBatch"></a>

### appendBatch

Append multiple values to the stream. Check the argument type and the licensing requirements for streaming.

```typescript
appendBatch(data: ReadonlyArray<TornadoRowDatum>): Promise<void>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `data` | `ReadonlyArray<TornadoRowDatum>` | Required |

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

- [TornadoRowDatum](https://chart.syidax.com/docs/types/TornadoRowDatum.md) — Type definition

<a id="method-shift"></a>

### shift

Drop the oldest streamed categories (the `data` boxes are not the stream).

```typescript
shift(count: number): Promise<void>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `count` | `number` | Required |

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

<a id="method-replace"></a>

### replace

Swap the streamed set (`replace([])` clears it); the base `values` never leave. Without `chart.streaming` the dies upsert into the base like a batch (quietly: no `appended`, no `binChanged`, as a ring replace).

```typescript
replace(data: ReadonlyArray<TornadoRowDatum>): Promise<void>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `data` | `ReadonlyArray<TornadoRowDatum>` | Required |

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

- [TornadoRowDatum](https://chart.syidax.com/docs/types/TornadoRowDatum.md) — Type definition

<a id="method-getStreamSource"></a>

### getStreamSource

The stream session's source (Chart Pro): like the stream methods it waits for a license still being confirmed.

```typescript
getStreamSource(): Promise<TornadoChartStreamSource | undefined>
```

Return type: `Promise<TornadoChartStreamSource | undefined>`. Call the method after element registration and await its Promise result.

- [TornadoChartStreamSource](https://chart.syidax.com/docs/types/TornadoChartStreamSource.md) — Type definition

<a id="method-setAnimation"></a>

### setAnimation

An asynchronous method. Check the argument and return types below.

```typescript
setAnimation(options: { duration?: number; easing?: TornadoChartEasing; enabled?: boolean; type?: TornadoChartAnimationType }): Promise<void>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `options` | `{ duration?: number; easing?: TornadoChartEasing; enabled?: boolean; type?: TornadoChartAnimationType }` | Required |

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

- [TornadoChartEasing](https://chart.syidax.com/docs/types/TornadoChartEasing.md) — Type definition
- [TornadoChartAnimationType](https://chart.syidax.com/docs/types/TornadoChartAnimationType.md) — Type definition

<a id="method-pauseAnimation"></a>

### pauseAnimation

Pause the current animation.

```typescript
pauseAnimation(): Promise<void>
```

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

<a id="method-resumeAnimation"></a>

### resumeAnimation

Resume a paused animation.

```typescript
resumeAnimation(): Promise<void>
```

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

<a id="method-replayAnimation"></a>

### replayAnimation

Replay the initial sweep from min → value(s). No-op when animation is off / reduced.

```typescript
replayAnimation(): Promise<void>
```

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

<a id="method-hitTest"></a>

### hitTest

The box under a host-local CSS point (the nearest slot, within half a pitch), or null.

```typescript
hitTest(cssX: number, cssY: number): Promise<TornadoChartPointerEventDetail | null>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `cssX` | `number` | Required |
| `cssY` | `number` | Required |

Return type: `Promise<TornadoChartPointerEventDetail | null>`. Call the method after element registration and await its Promise result.

- [TornadoChartPointerEventDetail](https://chart.syidax.com/docs/types/TornadoChartPointerEventDetail.md) — Type definition

<a id="method-showTooltipAtPoint"></a>

### showTooltipAtPoint

Open the tooltip for a dot programmatically. `pointIndex` is the category (row) index; the optional `seriesIndex` selects a group within that row (defaults to the first visible group's dot in the row). Returns the emitted tooltip detail, or null when no dot resolves / the tooltip is disabled.

```typescript
showTooltipAtPoint(index: number, seriesIndex?: number | TornadoChartSide): Promise<CartesianTooltipEventDetail | null>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `index` | `number` | Required |
| `seriesIndex` | `number \| TornadoChartSide` | Optional |

Return type: `Promise<CartesianTooltipEventDetail | null>`. Call the method after element registration and await its Promise result.

- [CartesianTooltipEventDetail](https://chart.syidax.com/docs/types/CartesianTooltipEventDetail.md) — Type definition
- [TornadoChartSide](https://chart.syidax.com/docs/types/TornadoChartSide.md) — Type definition

<a id="method-hideTooltip"></a>

### hideTooltip

Close the currently visible tooltip.

```typescript
hideTooltip(): Promise<void>
```

Return type: `Promise<void>`. Call the method after element registration and await its Promise result.

<a id="method-getEngineStatus"></a>

### getEngineStatus

Requested engine vs what runs, and why (CHART-ADD-08): always Standard (this type has no WebGPU renderer); read without side effects, never consults the license.

```typescript
getEngineStatus(): Promise<ChartEngineStatus>
```

Return type: `Promise<ChartEngineStatus>`. Call the method after element registration and await its Promise result.

- [ChartEngineStatus](https://chart.syidax.com/docs/types/ChartEngineStatus.md) — Type definition