> ## Documentation Index
> Fetch the complete documentation index at: https://anvil.servicetitan.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Donut

> Donut chart implementation for @servicetitan/anvil2-charts-kit.

export const LiveCode = ({children, customHeight, clickToLoad, example, fullWidth, fullHeight, hideCodeInLiveCode, screenshot, screenshotOnly, showCode: showCodeProp}) => {
  const SCREENSHOTS_BASE = "https://servicetitan.github.io/anvil2-docs-live-code/screenshots";
  const STACKBLITZ_BASE = "https://stackblitz.com/github/servicetitan/anvil2-docs-live-code/tree/main/examples";
  const [showCodeBlock, setShowCodeBlock] = useState(showCodeProp ?? false);
  const [isLocalOverride, setIsLocalOverride] = useState(false);
  useEffect(() => {
    const examplePath = `/images/live-code-screenshots-tmp/${example}.png`;
    fetch(examplePath, {
      method: "HEAD"
    }).then(r => {
      if (r.ok) setIsLocalOverride(true);
    }).catch(() => {});
  }, [example]);
  const screenshotBase = isLocalOverride ? "/images/live-code-screenshots-tmp" : SCREENSHOTS_BASE;
  if (screenshotOnly) {
    return <Frame className="flex flex-col">
        <div className="flex dark:hidden" style={{
      justifyContent: "center",
      alignItems: "center",
      width: fullWidth ? "100%" : "50%",
      minHeight: fullHeight ? "284px" : undefined,
      background: "#FFFFFF"
    }}>
          <img srcset={`${screenshotBase}/${example}.png, ${screenshotBase}/${example}-2x.png 2x`} src={`${screenshotBase}/${example}.png`} alt={example} noZoom />
        </div>
        <div className="hidden dark:flex" style={{
      justifyContent: "center",
      alignItems: "center",
      width: fullWidth ? "100%" : "50%",
      minHeight: fullHeight ? "284px" : undefined,
      background: "#141414"
    }}>
          <img srcset={`${screenshotBase}/${example}-dark.png, ${screenshotBase}/${example}-dark-2x.png 2x`} src={`${screenshotBase}/${example}-dark.png`} alt={example} noZoom />
        </div>
      </Frame>;
  }
  if (screenshot) {
    return <Frame className="flex flex-col -mb-2">
        <div className="flex dark:hidden bg-white dark:bg-codeblock border border-gray-950/10 dark:border-white/10 dark:twoslash-dark rounded-2xl overflow-hidden" style={{
      justifyContent: "center",
      alignItems: "center",
      width: fullWidth ? "100%" : "50%",
      minHeight: fullHeight ? "284px" : undefined
    }}>
          <img srcset={`${screenshotBase}/${example}.png, ${screenshotBase}/${example}-2x.png 2x`} src={`${screenshotBase}/${example}.png`} alt={example} noZoom />
        </div>

        <div className="hidden dark:flex bg-white dark:bg-codeblock border border-gray-950/10 dark:border-white/10 dark:twoslash-dark rounded-2xl overflow-hidden" style={{
      background: "#141414",
      justifyContent: "center",
      alignItems: "center",
      width: fullWidth ? "100%" : "50%",
      minHeight: fullHeight ? "284px" : undefined
    }}>
          <img srcset={`${screenshotBase}/${example}-dark.png, ${screenshotBase}/${example}-dark-2x.png 2x`} src={`${screenshotBase}/${example}-dark.png`} alt={example} noZoom />
        </div>

        <div className="flex justify-end items-center text-xs py-2 px-1 gap-4">
          {!showCodeProp ? <button className="inline-flex justify-end items-center text-gray-700 dark:text-gray-50 hover:text-blue-500 dark:hover:text-blue-300 transition-colors group self-end gap-1 cursor-pointer" onClick={() => setShowCodeBlock(!showCodeBlock)} style={{
      appearance: "none"
    }}>
              <Icon icon="code" size="12px" className="group-hover:bg-blue-500 dark:group-hover:bg-blue-300" />
              <span>{showCodeBlock ? "Hide code" : "Show code"}</span>
            </button> : null}

          <a className="inline-flex justify-end items-center hover:text-blue-500 dark:hover:text-blue-300 transition-colors group self-end gap-1" href={`${STACKBLITZ_BASE}/${example}?file=src/App.tsx`} target="_blank" rel="noreferrer">
            <Icon icon="bolt" size="12px" className="group-hover:bg-blue-500 dark:group-hover:bg-blue-300" />
            <span>StackBlitz demo</span>
          </a>
        </div>

        <div className="grid transition-[grid-template-rows] duration-300 ease-in-out overflow-auto overflow-y-hidden overflow-x-auto" style={showCodeBlock ? {
      gridTemplateRows: "1fr"
    } : {
      gridTemplateRows: "0fr"
    }}>
          <div style={{
      minHeight: 0,
      overflowX: "auto",
      overflowY: "hidden",
      marginBlockStart: "-1.25rem",
      marginBlockEnd: "-1.5rem"
    }}>
            {children}
          </div>
        </div>
      </Frame>;
  } else {
    return <div style={{
      display: "flex",
      width: fullWidth ? "100%" : "50%",
      minHeight: customHeight ? customHeight : "316px",
      resize: "vertical",
      overflow: "auto"
    }}>
        <iframe title={example} style={{
      flex: 1,
      width: fullWidth ? "100%" : "50%",
      minHeight: customHeight ? customHeight : "316px"
    }} src={`${STACKBLITZ_BASE}/${example}?embed=1&hideNavigation=1&hideExplorer=1&terminalHeight=0&file=src/App.tsx${clickToLoad ? "&ctl=1" : ""}${hideCodeInLiveCode ? "&view=preview" : ""}`} allow="accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking" sandbox="allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts" />
      </div>;
  }
};

A donut chart shows part-to-whole relationships. Each slice is a variable, so `variant` assigns color per datum. Use `monochrome` for four or fewer slices, and `categorical` for five or more, grouping the remainder into an "Other" slice. Donut charts do not use the semantic palette.

* Design rules: [Donut charts](/docs/web/data-visualization/donut-charts)
* Shared API / tooltips / palettes: [Chart component](/docs/kits/charts-react/chart)

***

## Minimal option

A donut is a pie series with an inner radius. The `padAngle` and slice corner radius come from `variant`.

<LiveCode showCode example="charts-react-donut" fullWidth screenshot>
  ```tsx lines expandable theme={null}
  import { Chart, type EChartsOption } from "@servicetitan/anvil2-charts-kit";
  import "@servicetitan/anvil2-charts-kit/styles.css";

  function App() {
    const option: EChartsOption = {
      legend: { orient: "vertical", right: 8, top: "middle" },
      series: [
        {
          type: "pie",
          radius: ["40%", "70%"],
          data: [
            { name: "Organic", value: 48 },
            { name: "Paid", value: 32 },
            { name: "Referral", value: 14 },
            { name: "Other", value: 6 },
          ],
        },
      ],
    };

    return (
      <Chart option={option} variant="monochrome" width={480} height={300} />
    );
  }

  export default App;
  ```
</LiveCode>

***

## Variant styling

`variant` applies the following treatment:

| Concern       | Behavior                                            |
| ------------- | --------------------------------------------------- |
| Color         | Monochrome steps or categorical hues by slice index |
| Gaps          | `padAngle` of roughly 4px between slices            |
| Slice corners | `borderRadius` on slices                            |
| Hover         | Series focus and blur                               |

Avoid hand-authoring slice gaps or palette hex values to reproduce this treatment.

***

## Labels inside slices

Direct labels follow the same pattern as bar end labels. The chart theme styles `pie.label` with a font, a translucent background, and padding, and leaves it at `show: false`. Enable it with `position: "inside"`.

Use percent of total for part-to-whole, which ECharts writes as `{d}%`. Raw values through `{c}` also work. Categorical donut charts require direct labels, because the slice colors do not all reach a 3:1 contrast ratio against each other. Leave `renderTooltip` unset when the in-slice labels carry enough information. Small slices clip their labels, so group them into an "Other" slice.

<LiveCode showCode example="charts-react-donut-direct-labels" fullWidth screenshot>
  ```tsx lines expandable theme={null}
  import { Chart, type EChartsOption } from "@servicetitan/anvil2-charts-kit";
  import "@servicetitan/anvil2-charts-kit/styles.css";

  function App() {
    const option: EChartsOption = {
      legend: { orient: "vertical", right: 8, top: "middle" },
      series: [
        {
          type: "pie",
          radius: ["40%", "70%"],
          data: [
            { name: "Organic", value: 48 },
            { name: "Paid", value: 32 },
            { name: "Referral", value: 14 },
            { name: "Other", value: 6 },
          ],
          label: {
            show: true,
            position: "inside",
            formatter: "{d}%",
          },
        },
      ],
    };

    return (
      <Chart option={option} variant="monochrome" width={480} height={300} />
    );
  }

  export default App;
  ```
</LiveCode>

***

## Labels outside with a leader line

Outside labels suit charts where in-slice text would clutter or clip. Set `position: "outside"` and `labelLine: { show: true }`. Add the category to the formatter through `{b}` when the chart has no legend, and leave room in the plot by reducing `radius` or dropping the side legend so the labels do not collide.

<LiveCode showCode example="charts-react-donut-outside-labels" fullWidth screenshot>
  ```tsx lines expandable theme={null}
  import { Chart, type EChartsOption } from "@servicetitan/anvil2-charts-kit";
  import "@servicetitan/anvil2-charts-kit/styles.css";

  function App() {
    const option: EChartsOption = {
      series: [
        {
          type: "pie",
          radius: ["35%", "55%"],
          data: [
            { name: "Organic", value: 48 },
            { name: "Paid", value: 32 },
            { name: "Referral", value: 14 },
            { name: "Other", value: 6 },
          ],
          label: {
            show: true,
            position: "outside",
            formatter: "{b}\n{d}%",
          },
          labelLine: { show: true },
        },
      ],
    };

    return (
      <Chart option={option} variant="monochrome" width={480} height={300} />
    );
  }

  export default App;
  ```
</LiveCode>

***

## Mixed labels by slice size

The series defaults to inside labels, and slices below a percentage threshold override to outside labels with a `labelLine`. ECharts merges per-slice `label` and `labelLine` values onto the series defaults. The threshold is a product decision: the 20% cutoff in this example is not a design system constant.

<LiveCode showCode example="charts-react-donut-mixed-labels" fullWidth screenshot>
  ```tsx lines expandable theme={null}
  import { Chart, type EChartsOption } from "@servicetitan/anvil2-charts-kit";
  import "@servicetitan/anvil2-charts-kit/styles.css";

  function App() {
    const data = [
      { name: "Organic", value: 48 },
      { name: "Paid", value: 32 },
      { name: "Referral", value: 14 },
      { name: "Other", value: 6 },
    ];
    const MIN_PERCENT = 20;
    const total = data.reduce((sum, d) => sum + d.value, 0);
    const slices = data.map((d) => {
      const pct = (d.value / total) * 100;
      if (pct >= MIN_PERCENT) return d;
      return {
        ...d,
        label: { position: "outside" as const, formatter: "{b}\n{d}%" },
        labelLine: { show: true },
      };
    });

    const option: EChartsOption = {
      series: [
        {
          type: "pie",
          radius: ["35%", "55%"],
          data: slices,
          label: { show: true, position: "inside", formatter: "{d}%" },
          labelLine: { show: false },
        },
      ],
    };

    return (
      <Chart option={option} variant="monochrome" width={480} height={300} />
    );
  }

  export default App;
  ```
</LiveCode>

***

## Tooltips

Pass `renderTooltip` for richer hover content. See [Chart component](/docs/kits/charts-react/chart#tooltips).

<LiveCode showCode example="charts-react-donut-tooltip" fullWidth screenshot>
  ```tsx lines expandable theme={null}
  import {
    Chart,
    type ChartTooltipInfo,
    type EChartsOption,
  } from "@servicetitan/anvil2-charts-kit";
  import "@servicetitan/anvil2-charts-kit/styles.css";
  import { CartoTheme, Text, TooltipSurface } from "@servicetitan/anvil2-ai-kit";
  // This file is most likely already in your workspace
  import "@servicetitan/anvil2-ai-kit/styles.css";

  function renderTooltip({ name, points }: ChartTooltipInfo) {
    return (
      <TooltipSurface
        content={
          <>
            <Text text={name} />
            {points.map((point) => (
              <Text
                key={point.seriesIndex}
                text={`${point.seriesName ? `${point.seriesName}: ` : ""}${String(point.value)}`}
              />
            ))}
          </>
        }
      />
    );
  }

  function App() {
    const option: EChartsOption = {
      legend: { orient: "vertical", right: 8, top: "middle" },
      series: [
        {
          type: "pie",
          radius: ["40%", "70%"],
          data: [
            { name: "Organic", value: 48 },
            { name: "Paid", value: 32 },
            { name: "Referral", value: 14 },
            { name: "Other", value: 6 },
          ],
        },
      ],
    };

    return (
      <CartoTheme>
        <Chart
          option={option}
          variant="monochrome"
          renderTooltip={renderTooltip}
          width={480}
          height={300}
        />
      </CartoTheme>
    );
  }

  export default App;
  ```
</LiveCode>