Charts

Line Chart

Multi-series line. Default and Motion variants.

Examples

Default

Cronus ready-made LineChart — same series API as AreaChart, without the fill.

tsx

<LineChart data={TIMESERIES} series={[{ key: "revenue", label: "Revenue" }, { key: "costs", label: "Costs" }]} />

Motion

Hover cursor, crosshair, animated tooltip. Import from @cronus-ui/ui/charts.

tsx

import { LineChart, Line, Grid, XAxis, ChartTooltip } from "@cronus-ui/ui/charts";

<LineChart data={data}>
  <Grid horizontal />
  <Line dataKey="users" stroke="var(--chart-line-primary)" />
  <Line dataKey="pageviews" stroke="var(--chart-line-secondary)" />
  <XAxis />
  <ChartTooltip />
</LineChart>

Installation

Default is a ready-made wrapper from the registry. Motion is the composable engine at @cronus-ui/ui/charts (peer visx + motion).

bash

npx cronus-ui add line-chart

tsx

import { LineChart } from "@cronus-ui/ui";

Usage

Same composable shell as AreaChart. Add YAxis with matching yAxisId for biaxial charts, ProjectionLine for a forecast, or ProfitLossLine for a sign-split series.

tsx

import { LineChart, Line, Grid, XAxis, ChartTooltip } from "@cronus-ui/ui/charts";

<LineChart data={data}>
  <Grid horizontal />
  <Line dataKey="users" stroke="var(--chart-line-primary)" />
  <Line dataKey="pageviews" stroke="var(--chart-line-secondary)" />
  <XAxis />
  <ChartTooltip />
</LineChart>

Components

Motion API — compose these under the chart root. Default wrapper props are in Default API below.

LineChart

Root that sizes the SVG, provides scales, and hosts series children.

Prop	Type	Default	Description
`data`*	`Record<string, unknown>[]`	—	Rows with a date (or x) field and numeric series.
`xDataKey`	`string`	`"date"`	Key for the x-axis.
`margin`	`Partial<{ top, right, bottom, left }>`	`{ top: 40, right: 40, bottom: 40, left: 40 }`	Plot margins.
`animationDuration`	`number`	`1100`	Clip-reveal duration in ms.
`aspectRatio`	`string`	`"2 / 1"`	CSS aspect ratio.
`status`	`"loading" \| "ready"`	`"ready"`	Loading ↔ ready choreography.
`xDomain`	`[Date, Date]`	—	Visible x-range for brush zoom.
`className`	`string`	—	Container class.

Line

Stroked series with optional edge fade, markers, loading pulse, and a dashed tail.

Prop	Type	Default	Description
`dataKey`*	`string`	—	Y-value key.
`yAxisId`	`string \| number`	`"left"`	Scale group for dual axes.
`stroke`	`string`	`var(--chart-line-primary)`	Line color.
`strokeWidth`	`number`	`2.5`	Line width.
`curve`	`CurveFactory`	`curveNatural`	d3 curve.
`fadeEdges`	`boolean \| "left" \| "right"`	`false`	Fade the stroke at chart edges.
`dashFromIndex`	`number`	—	Index from which the stroke becomes dashed.
`showMarkers`	`boolean`	`false`	Point markers.

Grid

Plot-area grid lines. Horizontal by default; optional shimmer while loading.

Prop	Type	Default	Description
`horizontal`	`boolean`	`true`	Show horizontal lines.
`vertical`	`boolean`	`false`	Show vertical lines.
`numTicksRows`	`number`	`5`	Horizontal line count.
`numTicksColumns`	`number`	`10`	Vertical line count.
`stroke`	`string`	`var(--chart-grid)`	Line color while ready.
`strokeDasharray`	`string`	`"4,4"`	Dash pattern.
`shimmer`	`boolean`	`false`	Animate a band across horizontal lines.
`highlightRowValues`	`number[]`	—	Rows drawn with alternate styling (e.g. zero).

Background

Pattern fill for the plot area when you omit Grid, or as a texture behind series.

Prop	Type	Default	Description
`pattern`	`PatternPresetId \| "none"`	—	Pattern preset. `none` renders nothing.
`color`	`string`	`var(--chart-grid)`	Pattern stroke color.
`opacity`	`number`	`1`	Pattern fill opacity.
`fadeHorizontal`	`boolean`	`true`	Fade at left/right edges.

YAxis

Value labels on the left or right. Pair `yAxisId` with series for dual axes.

Prop	Type	Default	Description
`yAxisId`	`string \| number`	`"left"`	Scale group id.
`orientation`	`"left" \| "right"`	`"left"`	Which side to render.
`numTicks`	`number`	`5`	Approximate tick count.
`formatLargeNumbers`	`boolean`	`true`	Format 1000 as "1k".
`formatValue`	`(value: number) => string`	—	Custom tick formatter. Overrides formatLargeNumbers.

XAxis

Time-axis labels that fade when the crosshair passes.

Prop	Type	Default	Description
`numTicks`	`number`	`5`	Tick labels to show, including first and last.
`tickerHalfWidth`	`number`	`50`	Fade radius around the date pill.
`tickMode`	`"data" \| "domain"`	`"data"`	`data` snaps labels to rows (crosshair-aligned). `domain` spaces ticks evenly.

ChartTooltip

Motion tooltip: crosshair, series dots, floating panel, optional date pill. This is not the recharts ChartTooltip from `@cronus-ui/ui`.

Prop	Type	Default	Description
`showDatePill`	`boolean`	`true`	Animated date ticker on the x-axis.
`showCrosshair`	`boolean`	`true`	Vertical crosshair.
`showDots`	`boolean`	`true`	Dots on series at the hovered x.
`dotVariant`	`"dot" \| "ring"`	`"dot"`	Filled circle or ring.
`indicatorColor`	`string \| (point) => string`	—	Crosshair and dot color.
`indicatorDasharray`	`string`	—	Dash pattern for the crosshair.
`indicatorFadeEdges`	`"both" \| "top" \| "bottom" \| "none"`	`"both"`	Vertical crosshair fade.
`matchCrosshair`	`boolean`	`false`	Panel uses the crosshair spring when true.
`damping`	`number`	`20`	Panel follow when matchCrosshair is false. 0 = instant.
`content`	`(props) => ReactNode`	—	Custom tooltip renderer.
`rows`	`(point) => TooltipRow[]`	—	Custom row generator.

Dual Y axes

Give each series a yAxisId and render two YAxis children with matching ids and opposite orientations.

tsx

<LineChart data={data}>
  <Line dataKey="users" yAxisId="left" stroke="var(--chart-1)" />
  <Line dataKey="revenue" yAxisId="right" stroke="var(--chart-2)" />
  <YAxis yAxisId="left" orientation="left" />
  <YAxis yAxisId="right" orientation="right" formatValue={(n) => MONEY.format(n)} />
  <XAxis />
  <ChartTooltip />
</LineChart>

Dashed tail

Use dashFromIndex to project incomplete periods — solid through yesterday, dashed through today.

tsx

<Line dataKey="users" dashFromIndex={data.length - 2} dashArray="6,4" />

Projection

ProjectionLine draws a forecast from the last real point. Pair with SeriesMarkers or a custom tooltip row for the projected value.

tsx

import { LineChart, Line, ProjectionLine, Grid, XAxis, ChartTooltip } from "@cronus-ui/ui/charts";

<LineChart data={data}>
  <Grid horizontal />
  <Line dataKey="users" />
  <ProjectionLine dataKey="forecast" />
  <XAxis />
  <ChartTooltip />
</LineChart>

Data format

type Point = {
  date: Date;
  users: number;
  pageviews: number;
};

const data: Point[] = [
  { date: new Date("2026-01-01"), revenue: 12000, costs: 8500 },
  { date: new Date("2026-01-02"), revenue: 13500, costs: 9200 },
];

Theming

Motion charts read `--chart-*` aliases that map onto Cronus semantic tokens (`--cronus-chart-1`…`--cronus-chart-5`, `--cronus-border`, `--cronus-fg`, surfaces). Override the aliases or the tokens — never palette scales (`bg-zinc-900`). Default wrappers use `ChartConfig` with `var(--cronus-chart-*)` / `var(--cronus-primary)`.

Full token reference: Theming.

Dependencies

Default needs the recharts peer. Motion needs visx (and sometimes d3) as optional peers — install only what this chart uses.

bash

bun add recharts

bash

bun add @visx/curve @visx/responsive @visx/scale @visx/shape motion react-use-measure @visx/gradient

Default API

Generated from the Default wrapper's exported types. Motion subcomponents are documented above.

LineChartProps

Extends HTMLAttributes<HTMLDivElement>

Prop	Type	Default	Description
`data`*	`Record<string, unknown>[]`	—	—
`xKey`	`string`	`"date"`	—
`series`*	`ChartSeries[]`	—	—
`formatValue`	`(value: number, name: string) => string`	—	—