# Composed chart

A React component in [Beamline](https://beamline.io/)'s [Charts & data-vis](https://beamline.io/components/charts) category. Live demo: https://beamline.io/components/composed-chart

Different measures on one time axis: bars, lines and areas per series, a left and a right value axis with their own formats, and reference lines.

## Use it for

- Two measures with different units over the same periods (orders and conversion rate).
- A volume with its trend line.

## Not for

- One measure ([line-chart](https://beamline.io/components/line-chart), [area-chart](https://beamline.io/components/area-chart) or [bar-chart](https://beamline.io/components/bar-chart)).
- Unrelated measures that need separate scales to be read honestly (two charts side by side).

## Anatomy

- title and description (figcaption; can be visually hidden)
- actions slot (range, type)
- legend (toggle buttons)
- table button
- plot (kept left to right in RTL: time runs one way, O1 D2)
- tooltip
- bars, lines and areas
- left axis
- right axis
- reference lines
- axis captions: with two value axes, each names the series it carries above its ticks

## Variants

- **0**: per series type: bar · line · area
- **1**: per series axis: left · right
- **2**: curve
- **3**: references

## States

- loading (skeleton bars)
- empty (no data for the range)
- missing values (gap, hatched or stub; tooltip and table say Not measured)
- series hidden from the legend
- table view

## Keyboard

- Tab focuses the plot; ←/→ (or ↑/↓) move the tooltip point by point, including onto unmeasured points; the first press starts at an end; Home/End jump; Escape hides the tooltip
- Legend buttons toggle series (aria-pressed)
- The table button switches to a table of every value and back

## Motion

Bars grow out of the baseline and lines and areas are revealed left to right once (500 ms); afterwards a hidden series or new data carries the marks to their new heights. Nothing moves under reduced motion.

## Props

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `data / x` | `T[] / keyof T` | — | Rows and the column on the category axis. |
| `series` | `ChartSeries[]` | — | { key, label, color?, format?, dashed? } per plotted column; colours follow the series palette. |
| `title / hideTitle / description` | `string / boolean / ReactNode` | — | The figure's name is always its accessible name. |
| `xFormat / yFormat` | `(v) => string` | — | Tick, tooltip and table formats. |
| `height` | `number` | — |  |
| `grid / legend / table` | `boolean` | — | Default on. |
| `loading` | `boolean` | — |  |
| `actions` | `ReactNode` | — | Controls beside the legend. |
| `className` | `string` | — |  |
| `series[].type / series[].axis` | `"bar" \| "line" \| "area" / "left" \| "right"` | — |  |
| `y2Format` | `(v) => string` | — | Format of the right axis and its series. |
| `curve` | `ChartCurve` | — |  |
| `references` | `ChartReference[]` | — |  |
| `classNames` | `ChartClassNames` | — | Frame, tooltip and slice-list parts as applicable to this chart. |
| `style / ref` | `CSSProperties / Ref<HTMLElement>` | — | The native chart figure; layout measurement refs stay internal. |

## Dependencies

`d3-shape`, `motion`

## Import

```tsx
import { ComposedChart } from "@/components/composed-chart/composed-chart";
```

## Get it

Composed chart is part of Beamline: 190 React components and screens your coding agent (Claude Code, Codex, Cursor or any MCP client) installs into your app through Beamline's MCP server, as a ready-built package or as plain React source you can change. $49 one payment (regular $200), no subscription, a year of updates, one licence for your whole team. [Get Beamline](https://beamline.io/checkout?pack=complete) · [Connect your agent](https://beamline.io/connect)

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