RadialChart

Radial bars and gauges, with tracks, labels along the arc and a center value.

Example
import { RadialChart } from "@elements/ui/chart-radial";
import type { ChartConfig } from "@elements/ui/chart";

<RadialChart data={rows} {config} value="visitors" name="browser" innerRadius={30} background />

<!-- a gauge -->
<RadialChart data={[{ task: "done", done: 64 }]} {config} value="done" name="task"
             max={100} startAngle={90} endAngle={-270} innerRadius="70%" background
             cornerRadius={12} centerValue="64%" centerLabel="complete" />

Parts

Part	What it is
RadialChart	The template. One ring of arcs per row.
.chart-radial-bar	One arc (an SVG path) and its own hit target.
.chart-radial-track	The background arc behind a bar, with background.
.chart-radial-ring	A grid circle; .is-filled rings draw a track.
.chart-center	Center text: .chart-center-value and .chart-center-label.
.chart	The figure. Declares --color-<key> for each config entry; keeps a 16:9 box unless sized by class.
.chart-plot	The focusable plot area holding the SVG; one tab stop.
.chart-tooltip	The tooltip: heading, one row per item with swatch, name and value, optional footer.
.chart-legend	The legend row; .chart-legend-item per series, a button with legend toggle.
.chart-table	The data as a table, visually hidden unless showTable.

Attributes

Attribute	Type	Default	Description
data	Row[]	(required)	One ring per row, the first innermost. A row's fill field colors its arc.
config	ChartConfig	(required)	The chart config: per data key a label, a color (any CSS color, usually var(--chart-N)) or a theme { light, dark }, and an optional icon; legendType and tooltipType; strokeDasharray and strokeOpacity dash and fade a line or an area's edge. Each key becomes --color-<key> on the chart.
value	string | string[]	(required)	The value field. Several sit side by side in each ring, or stack along it.
name	string	""	The name field: tooltip and legend names and colors through the config.
stack	boolean	false	Stack the value keys end to end along the arc.
stackOffset	"none" | "expand"	"none"	expand stacks every row to the end angle, so the arc reads shares.
reverseStackOrder	boolean	false	Stack the last value key first, so the first ends the arc; the legend and tooltip keep value order.
innerRadius	number | string	0	px, or a percent of the largest radius that fits.
outerRadius	number | string	"80%"	px, or a percent.
startAngle	number	0	Degrees, counter-clockwise from three o'clock.
endAngle	number	360	Where the largest value (or max) ends. 90 to -270 runs clockwise from twelve.
max	number	0	The value that fills the sweep; 0 uses the largest value or stack.
angleAxis	{ series?: string[]; max?: number }[]	[]	Several value scales, each for the keys it names; the first scales the rest.
radiusAxis	{ series?: string[]; reversed?: boolean }[]	[]	Ring orders, each for the keys it names; reversed puts the first row outermost.
hide	boolean | string[]	false	Value keys not drawn and left out of the tooltip; true for all.
layout	"radial" | "centric"	"radial"	centric makes each row a wedge of the turn whose value reaches out from innerRadius.
maxBarSize	number	0	The most a computed ring may be thick, px.
activeShape	boolean	false	Outline the active ring.
minPointSize	number	0	The least angle, in degrees, of any bar whose value is present, zero included.
forceCornerRadius	boolean	false	A bar too short for its corners draws as a round dot.
cornerIsExternal	boolean	false	Round the ends outside the bar, past its start and end angles.
margin	{ top?, right?, bottom?, left? }	{}	Space around the plot in px.
cx, cy	number | string, number | string	"50%", "50%"	The center of the chart: px from the left and top edges, or a percentage of the plot.
barSize	number	0	Fixed ring thickness, px; 0 computes it.
barGap	number	4	px between side-by-side arcs in a ring.
barCategoryGap	number | string	"10%"	Space on each side of a ring's arcs.
cornerRadius	number	0	Rounded arc ends, px.
minAngle	number	0	The least angle of a bar with a value, degrees.
separator	boolean	false	A gap between stacked arcs in the surface color.
background	boolean	false	A track behind each arc over the whole sweep.
grid	boolean | { radii?: number[]; radialLines?: boolean; filled?: boolean }	false	Circles through the rings or at radii; filled draws the first in the muted surface and the rest in the background, so two radii make a track.
labels	boolean | { position?: "insideStart" | "insideEnd" | "end"; key?: string; formatter?: (value, row) => string }	false	Text along each arc.
centerValue	string	""	Large text in the center.
centerLabel	string	""	Small text under it.
tooltip	boolean | { indicator?: "dot" | "line" | "dashed"; hideLabel?: boolean; hideIndicator?: boolean; color?: string; labelKey?: string; nameKey?: string; labelFormatter?: (label, row) => string; formatter?: (value, key, row) => string; footer?: (row) => string; footerLabel?: string; unit?: string; defaultIndex?: number; cursor?: boolean; filterNull?: boolean; trigger?: "hover" | "click"; active?: boolean; position?: { x?, y? }; reverseDirection?: { x?, y? }; itemSorter?: "name" | "value" | "key" | (item) => number | string; includeHidden?: boolean; animationDuration?: number; animationEasing?: string | (t) => number; isAnimationActive?: boolean }	true	The tooltip: false turns it off; an object sets the indicator, hides the heading or swatches, takes names and headings from other keys, formats them, adds a footer line, or turns off the hover cursor. More options: trigger click (a click shows it and it stays), active (always or never shown), position (a fixed spot), reverseDirection, itemSorter and includeHidden.
legend	boolean | { position?: "top" | "bottom" | "left" | "right" | "center" | "insideTop" | "insideBottom" | "insideLeft" | "insideRight" | "insideTopLeft" | "insideTopRight" | "insideBottomLeft" | "insideBottomRight" | { x, y }; offset?: number; iconSize?: number; verticalAlign?: "top" | "middle" | "bottom"; align?: "left" | "center" | "right"; layout?: "horizontal" | "vertical"; iconType?: "square" | "rect" | "circle" | "line" | "plainline" | "diamond" | "triangle" | "cross" | "star" | "wye" | "none"; formatter?: (name, key) => string; itemSorter?: "name" | "key" | (item) => number | string; hideIcon?: boolean; nameKey?: string; toggle?: boolean }	false	The legend: above or below the plot, or beside it with verticalAlign middle; position puts it beside the plot, over it at an inside spot or the center, or at a point, offset moves it, iconSize sizes the swatch; align, a vertical layout, the swatch shape (iconType), a name formatter and an itemSorter; names from another key; toggle makes each item a button that hides its series.
active	number (two-way)	-1	The active item index. Hover and the arrow keys move it; when the pointer leaves it returns to the value it had.
hidden	string[] (two-way)	[]	Series keys not drawn. They stay in the legend, where a toggle legend shows them again.
label	string	"Radial chart"	The chart's accessible name and its table's caption.
animate	boolean	true	Marks enter with motion and move to new values. Off under prefers-reduced-motion.
animation	{ begin?: number; duration?: number; easing?: string | (t) => number; matchBy?: "index" | "append" | (item, index) => key; interpolate?: (items, t) => items; newValues?: boolean }	{}	Times the entry and the move to new data. matchBy pairs old and new items by position or by a key, matchByDataKey(field) from the chart package; interpolate draws every frame of a change from the paired items and the eased time; newValues false shows an unpaired new point at once.
showTable	boolean	false	Show the chart's data table under the plot. The table is always in the accessibility tree.
class	string	""	Classes on the figure. Size the chart here: it keeps a 16:9 box unless given a height or aspect-ratio.
attrs	Record<string, string | number | boolean | undefined>	{}	Any other attributes for the figure: id, data-testid, aria-*.
syncId	string	""	Charts with the same syncId share the active item and its tooltip.
syncMethod	"index" | "value"	"index"	Match the shared item by position, or by its category or name.
onActiveChange	(index: number) => void	() => {}	The user moved the active item (hover, leave or keys).
onItemClick	(index: number) => void	() => {}	A click or tap on an item, with its index.
onHiddenChange	(hidden: string[]) => void	() => {}	A legend toggle changed hidden.

Keyboard

Keys	Action
Tab	Focuses the chart (one tab stop) and shows the tooltip for the item the keys last reached, else the active item, else the first.
ArrowRight / ArrowDown	Next item. The same under dir=rtl: the plot is not mirrored, so keys follow the screen.
ArrowLeft / ArrowUp	Previous item.
Home / End	First and last item.
Escape	Hides the tooltip. In a dialog, the dialog stays open until the next Escape.

Data attributes

Attribute	Values	On
data-chart	"bar" | "line" | "area" | "pie" | "radar" | "radial"	figure
data-state	"open" | "closed"	.chart-tooltip
data-index	the item index	.chart-hit and pie, radial marks
data-series	the series key	marks
data-resizing	present while the chart redraws for a new size	figure
data-entered	present once the entry motion is over	figure
aria-pressed	true | false	.chart-legend-item (toggle)

Accessibility

• The plot is one tab stop: role=group, aria-roledescription=chart, named by label, described by the data table.
• The SVG is aria-hidden; a screen reader gets the data from the table, which every chart renders.
• Arrow keys move through the items and each move is announced in a polite live region, for example "February: Desktop 305, Mobile 200".
• Identity is never color alone: a legend for two or more series and labels on the tooltip rows.
• Legend toggles are buttons with aria-pressed.

See also

• Chart (opens in a new tab): What every chart shares: the config and its colors, the tooltip, the legend, the palette and the data table.
• BarChart (opens in a new tab): Vertical, horizontal, stacked and grouped bars with tooltip, legend and labels.
• LineChart (opens in a new tab): Lines over categories with dots, curves, labels and a crosshair tooltip.
• AreaChart (opens in a new tab): Filled areas, stacked or expanded, solid or gradient, with a crosshair tooltip.
• PieChart (opens in a new tab): Pie and donut charts with labels, a center value, an active slice and stacked rings.
• RadarChart (opens in a new tab): Values on radial axes, one polygon per series, over a polygon or circle grid.