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Charts

Free

Interactive Pie Chart

A donut where a select picks the month: its slice grows, an outer ring wraps it and the center shows its count. Interactive, for Svelte on TanStack Charts.

Framework
Charting library

Preview

Preview width

About

Use it when a card should answer one question at a time: what was May's share? The reader picks a month and the donut highlights that slice and prints its value. When all values matter at once, a labeled pie or a bar chart shows them without a control.

Five monthly slices sit on a ring. The selected month's slice extends past the others, a thin band of the same color wraps it, and the center shows its count above "Visitors".

Installation

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Usage

<script lang="ts">
import ChartPieInteractive from "@/components/charts/chart-pie-interactive.svelte";
</script>
<ChartPieInteractive />

Customize

  • The definition is derived from the active month, not static: chartDefinition(activeMonth) builds it, memoized on the month, so a new pick redraws the highlight and the center.
  • Three radialArc marks share one pie() output: every slice, the active slice with outerRadius 10px out, and an outer band from radius + 12 to radius + 25.
  • A radialText at the center prints the active row's desktop count; "Visitors" sits under it in var(--muted-foreground).
  • The select's swatches take each month's color straight from chartConfig: the select is outside ChartContainer, which sets the --color-<month> variables only inside itself.
  • ChartContainer is aspect-square w-full max-w-[300px], a little larger than the other donuts, to fit the outer band.

FAQ

How does the select drive the chart?

The active month lives in state (React useState, a Vue ref, Svelte $state or a Solid signal), the select writes it, and the definition is derived from it through chartDefinition(activeMonth): when the month changes, the chart redraws with the new slice highlighted and its count in the center.

How are the bigger slice and the outer ring drawn?

Three radialArc marks over the same slices: all five, then the active one with outerRadius 10px past the ring, then the same slice again as a thin band from 12px to 25px out, in the same color. The last two sit in a decorative layer, so the pointer reads the ring under them.

What sets the number in the middle?

A radialText at the center prints the active row's desktop value, with "Visitors" under it. It's built from the same state as the highlight, so the two always agree.

How do the select's swatches match the slices?

Each option's swatch is the month's color from chartConfig, the same var(--chart-N) its slice paints with through --color-<month>, so the list doubles as the chart's legend. The select sits outside ChartContainer, where those variables aren't set, so it reads the config.

Does it work without a mouse?

Yes. The select is our own component, labeled and keyboard-operable, and the chart takes focus too: Tab in and the arrow keys walk the slices while the select keeps the highlight.

Can I use buttons instead of a select?

Replace the select with buttons or tabs that write the same state. Anything that sets the active month works, including ChartContainer's onSelect, which fires when a slice is clicked or picked with Enter.

API Reference

ChartContainer

<div> data-slot="chart"

PropType
configChartConfig

Each series' label, icon and color, read by the tooltip and the legend.

definitionChartDefinition

The chart: defineChart(spec, chartTooltip()), its data, marks, scales and axes, and the tooltip's focus.

ariaLabelstring

The chart's accessible name: the card's title.

ariaDescription?string

The chart's accessible description.

class?string

The container's size: aspect-auto h-[250px] w-full, mx-auto aspect-square max-h-[250px]. It's aspect-video by default.

children?Snippet

What sits under the chart inside the container: a ChartLegend.

tooltip?(ChartTooltipContentOptions & { class?: string }) | false

ChartTooltipContent's options (indicator, hideLabel, labelFormatter…) for the default body, or false for TanStack's own tooltip body.

Type
(ChartTooltipContentOptions & { class?: string }) | false
renderTooltip?Snippet<[ChartTooltipBodySnippetContext]>

A whole tooltip body of your own, in place of ChartTooltipContent: it gets the focused points (each with its datum, group and color). A snippet.

Type
Snippet<[ChartTooltipBodySnippetContext]>
defaultIndex?number

The category whose tooltip shows before any pointer, as Recharts' defaultIndex.

height?number

A fixed height in pixels for the chart, in place of the container's.

aspectRatio?number

A width-to-height ratio for the chart, in place of the container's height.

initialWidth?number

The width the chart renders at before it's measured.

onFocusChange?(point: ChartPoint | null) => void

Called as the focused point changes: a pointer, a key or a tap.

Type
(point: ChartPoint | null) => void
onFocusGroupChange?(points: readonly ChartPoint[]) => void

Called with every point at the focused category (a stacked or grouped chart's).

Type
(points: readonly ChartPoint[]) => void
onSelect?(point: ChartPoint | null) => void

Called when a point is clicked or picked with Enter.

Type
(point: ChartPoint | null) => void
CSS variableType
--color-<key>?color

Each config key's color (its theme color in light and dark), set on the container: the marks paint with var(--color-<key>).

ChartTooltipContent

<div>

PropType
pointsreadonly ChartPoint[]

The focused points, from the tooltip's context. ChartContainer passes them to its default body; a body of your own passes its context's.

indicator?"dot" | "line" | "dashed"

The indicator's shape beside each row.

Type
"dot" | "line" | "dashed"
Default
"dot"
hideLabel?boolean

Hides the label above the rows (the focused category).

Default
false
hideIndicator?boolean

Hides each row's color indicator.

Default
false
label?string

The label's text in place of the focused category, looked up in config.

labelKey?string

The datum field (or config key) the label is read from, looked up in config.

nameKey?string

The datum field (or config key) each row's series is read from: a pie's browser.

valueKey?string

The datum field each row's value is read from, for points that carry geometry rather than values (a pie's, from pie()).

color?string

One indicator color for every row, in place of each series' own.

labelFormatter?(label: string, points: readonly ChartPoint[]) => string

Formats the label (the config's label or the category), with the rows' points: a date written out, a unit.

Type
(label: string, points: readonly ChartPoint[]) => string
formatter?Snippet<[{ index, item, name, value }]>

A row's content in place of its indicator, name and value, as shadcn's formatter: a unit, a currency, a total row. A snippet.

Type
Snippet<[{ index, item, name, value }]>
class?string

Classes for the tooltip's card.

ChartLegend

<div>

PropType
config?ChartConfig

The series to list: the container's config by default.

keys?readonly string[]

The series keys to list, in order: every key with a color by default.

hideIcon?boolean

Hides each series' icon (from config), leaving its color swatch.

Default
false
verticalAlign?"top" | "bottom"

Above the chart or under it.

Type
"top" | "bottom"
Default
"bottom"
class?string

Classes for the legend's row.

ChartConfig

KeyType
label?string

The series' name in the tooltip and the legend.

icon?Component

An icon beside its name in the legend and the tooltip (a lucide-svelte icon).

color?string

Its color in both themes: a token (var(--chart-1)) or any CSS color.

theme?{ light: string; dark: string }

A color for each theme, in place of color.

Helpers

ExportType
chartTooltip?(settings?: ChartTooltipSettings) => ChartDefinitionOptions

defineChart's second argument for a chart with a tooltip: what a pointer or a key focuses (group-x, each category's series, by default), the focus ring, and the host ChartContainer draws its body in.

Type
(settings?: ChartTooltipSettings) => ChartDefinitionOptions
chartTheme?ChartTheme

defineChart's theme in the site's tokens: the text, the grid and the palette (--chart-1 to --chart-5).

chartColors?(config: ChartConfig, keys?: readonly string[]) => { domain: string[]; range: string[] }

defineChart's color: each series key (in config order, or keys') painted var(--color-<key>), for marks with a color channel.

Type
(config: ChartConfig, keys?: readonly string[]) => { domain: string[]; range: string[] }
chartLinearScale?() => LinearScale

A value axis drawn as Recharts draws its default one: zero in the domain, five nice ticks. Pass it as a factory: y: { scale: chartLinearScale }.

Type
() => LinearScale
curveNatural?CurveFactory

D3's natural curve, for a smooth line or area: curve: d3Curve(curveNatural).

curveStep?CurveFactory

D3's step curve, for a line or area that holds each value: curve: d3Curve(curveStep).

curveMonotoneX?CurveFactory

D3's monotone curve, smooth without overshooting a point: curve: d3Curve(curveMonotoneX).

curveLinearClosed?CurveFactory

D3's closed linear curve: a radar's polygon (curve: curveLinearClosed on radialLine and radialArea).

useChart?() => { config: ChartConfig }

The config of the ChartContainer around a component of your own (a custom tooltip body or legend).

Type
() => { config: ChartConfig }
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