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Choropleth map

Values by country, or by any GeoJSON region, shaded in steps you choose. Add zoom, markers and a graticule, or draw the land as dots under a tilting camera.

TanStack Charts

PreviewCode

Installation

The command adds the example above to components/charts/ and, the first time, the chart kit to components/ui/charts/. Both are source files in your project from then on: read them, change them, delete what you don't use.

Free with an account. It carries your token, so the CLI installs everything in one go.

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Usage

data is a GeoJSON FeatureCollection. TopoJSON needs converting first. The world map the examples use, worldCountries, installs beside them in components/charts/data/.

import {
  ChoroplethChart,
  type ChoroplethFeature,
  ChoroplethFeatureComponent,
  ChoroplethTooltip,
} from "@/components/ui/charts";
import { worldCountries } from "@/components/charts/data/world-countries";

const signups: Record<string, number> = {
  Brazil: 1840,
  Canada: 2310,
  France: 2760,
  Germany: 3920,
  India: 4480,
  Japan: 1960,
  "United Kingdom": 3150,
  "United States of America": 9870,
};

const steps = [
  { color: "var(--chart-scale-05)", min: 4000 },
  { color: "var(--chart-scale-04)", min: 2000 },
  { color: "var(--chart-scale-03)", min: 1 },
];

const signupsOf = (feature: ChoroplethFeature) =>
  signups[feature.properties?.name ?? ""];

const colorOf = (feature: ChoroplethFeature) =>
  steps.find((step) => (signupsOf(feature) ?? 0) >= step.min)?.color ??
  "var(--muted)";

export const SignupsMap = () => (
  <ChoroplethChart ariaLabel="Sign-ups by country" data={worldCountries}>
    <ChoroplethFeatureComponent getFeatureColor={colorOf} />
    <ChoroplethTooltip getFeatureValue={signupsOf} valueLabel="Sign-ups" />
  </ChoroplethChart>
);

Anatomy

Draw the land with ChoroplethFeatureComponent for filled shapes or ChoroplethDotGrid for dots, then add the rest as you need it.

<ChoroplethChart clickToZoom data={worldCountries}>
  <ChoroplethGraticule />
  <ChoroplethFeatureComponent getFeatureColor={colorOf} />
  <ChoroplethMarker coordinates={[-0.13, 51.51]} label="London" />
  <ChoroplethTooltip getFeatureValue={valueOf} />
</ChoroplethChart>

ChoroplethChart: Projects the GeoJSON and owns the zoom, the pan and the camera.
ChoroplethFeatureComponent: Fills each country from fill, getFeatureColor or a pattern.
ChoroplethDotGrid: Draws the land, and the sea if you like, as a lattice of dots.
ChoroplethGraticule: Lines of latitude and longitude, 10 degrees apart by default.
ChoroplethMarker: A pin, dot or shape at a [longitude, latitude].
ChoroplethBackground: A pattern behind the map that stays put while it pans and zooms.
ChoroplethTooltip: The hovered country's name and, if you give one, its value.

Shading by value

getFeatureColor gets each feature and returns its color. Bucket the values into a few steps of --chart-scale-01 to --chart-scale-05 and give countries without data a muted fill, so they still read as land.

On the tooltip, getFeatureValue adds a value row and formatValue formats it. Return undefined and the row is hidden.

PreviewCode

Zoom and pan

zoomEnabled adds wheel and pinch zoom and drag to pan, between zoomMin (0.5) and zoomMax (4). With clickToZoom, a click flies the camera to the country or marker under it, and a second click, a click on the sea or Escape flies back.

While zoomed in, only the focused country reacts to hover, and the others stay clickable. To move the camera from your own buttons, call useChoroplethCamera() in a component inside the chart.

PreviewCode

A tilted camera

perspective tilts the map in 3D, with one view for the overview and one for a focused country. tilt leans it back and yaw turns it. view: "pointer" swings the overview as the pointer crosses the map, and view: "auto" looks at a focused country from its own side.

PreviewCode

Markers

ChoroplethMarker places a circle, square, diamond, triangle or pin at a [longitude, latitude], and keeps its pixel size while the map zooms. pulse plays a ripple on hover or all the time, glow adds a soft halo, and showLabel writes the label beside it.

PreviewCode

Dot grid

Swap ChoroplethFeatureComponent for ChoroplethDotGrid to draw the land as dots, colored per country with getFeatureColor. lattice picks hex or square spacing, and the sea gets fainter, smaller dots unless you set showOcean={false}.

The dots grow as the camera zooms in, up to zoomDotSize, and edgeFade softens the grid into the frame.

PreviewCode

Patterns

Put SVG patterns in patterns on ChoroplethFeatureComponent and return a pattern's id from getFeaturePattern. Countries that get null keep their color.

PreviewCode

Customization

The kit is in your project, in components/ui/charts/: your framework's components over a shared core/. Change a default there and every chart picks it up.

class goes on the chart's container, so size and spacing are utility classes.

The tooltip shows the feature's properties.name. getFeatureName renames it, and content replaces what the panel says: it gets the feature and its index.

The projection is Mercator, centered on [0, 20]. Move it with center, scale and translate, for example to frame one continent.

<ChoroplethTooltip
  content={({ feature }) => (
    <div class="grid gap-1">
      <span class="font-medium">{feature.properties?.name}</span>
      <span class="text-muted-foreground">
        {(signupsOf(feature) ?? 0).toLocaleString("en-US")} sign-ups
      </span>
    </div>
  )}
/>

Where a part renders content of its own, you pass it in. In Solid:

ChoroplethTooltip: content={({ feature, index }) => …}

Loading state

The map has no loading state. The shapes ship with your code, so what you usually wait for is the values: render the map with one neutral fill until they arrive, then switch to getFeatureColor.

Animation

The countries fade in over animationDuration, 800 ms by default, and enterTransition swaps the curve. Camera flights take zoomTransition: 700 ms on an ease-in-out unless you set a duration and an ease.

With reduced motion the camera jumps instead of flying, the pointer camera holds still and markers stop pulsing.

Theming

Every color in the kit is one of your theme's tokens or a mix of them, except --chart-positive, a fixed green. A preset or the .dark class restyles the chart, and overriding a token in your CSS changes it everywhere.

Without fill or getFeatureColor, countries cycle through --chart-scale-01 to --chart-scale-05. Borders take your --background, and the graticule and background pattern take --chart-grid.

Token	Default	Paints
`--chart-scale-01`	`--chart-1` at 10% over `--muted`	the low end of a color scale
`--chart-scale-05`	`--chart-1`	the high end of a color scale
`--chart-1`	your theme's	the first series
`--chart-grid`	`--border`	grid lines
`--chart-tooltip-background`	`--popover`	the tooltip panel
`--chart-tooltip-foreground`	`--popover-foreground`	the tooltip's values

globals.css

:root {
  --chart-grid: var(--muted);
  --chart-tooltip-background: var(--card);
}

Accessibility

The map is an image named by ariaLabel ("Choropleth chart" by default). A reader can't scan a map for the answer, so put it in ariaDescription: the top countries and their values.

The arrow keys step through the countries from west to east, skipping any too small to see at the current zoom. With clickToZoom, each marker is also a button ("Zoom to London") that Tab reaches and Enter flies to. Zooming into a country takes a pointer.

Tab: Moves focus to the map, then to each marker when clickToZoom is on.
Arrow Right: Moves to the next country east. ArrowDown does the same.
Arrow Left: Moves to the next country west. ArrowUp does the same.
Home: Jumps to the westernmost country.
End: Jumps to the easternmost country.
Enter: On a marker, flies the camera to it. Space does the same.
EscEscape: Flies the camera back out after a zoom.

API reference

Solid takes the same props as React, with class for className. A render prop is a function, called again when its arguments change, so destructured parameters stay current.

ChoroplethChart

PropType

dataFeatureCollection<Geometry, ChoroplethFeatureProperties>

GeoJSON FeatureCollection to draw, with one feature per region. Pass GeoJSON objects: TopoJSON is not read, so convert it first (for example with topojson-client's feature()).

Type: FeatureCollection<Geometry, ChoroplethFeatureProperties>

margin?Partial<Margin>

Chart margins in pixels. Any side you omit keeps its default.

Type: Partial<Margin>
Default: { top: 0, right: 0, bottom: 0, left: 0 }

animationDuration?number

Duration of the enter animation in milliseconds.

Default: 800

enterTransition?EnterTransition

Enter transition (a spring or a cubic-bezier tween), in seconds.

Default: a tween of `animationDuration` on the reveal curve

revealSignature?string

Changing this value replays the enter animation.

Default: ""

aspectRatio?string

Aspect ratio of the chart as "width / height".

Default: "16 / 9"

scale?number

Projection scale of the Mercator projection. When omitted it follows the chart width.

center?[number, number]

Geographic center of the map as [longitude, latitude].

Default: [0, 20]

translate?[number, number]

Pixel offset of the projection center as [x, y]. When omitted the map is centered in the chart.

zoomEnabled?boolean

Enable zoom and pan with the mouse wheel, pinch, and drag.

Default: false

zoomMin?number

Minimum zoom scale.

Default: 0.5

zoomMax?number

Maximum zoom scale.

Default: 4

initialZoom?TransformMatrix

Initial zoom transform.

Default: the identity transform (no zoom, no pan)

class?string

Additional class name for the chart container.

Default: ""

clickToZoom?boolean

Click a region or a marker to fly the camera to it; click it again, the empty map, or press Escape to fly back.

Default: false

focusMaxZoom?number

Largest camera scale when it frames a region.

Default: 6

zoomTransition?ChoroplethZoomTransition

Duration and easing of the click-to-zoom flight and of the camera's angle changes.

Default: { duration: 700, ease: [0.83, 0, 0.17, 1] }

perspective?ChoroplethPerspective

A 3D camera: one view for the zoomed-out map and one for a focused region (for example flat, swinging to look from the east once you zoom in).

childrenReactNode

ChoroplethFeatureComponent or ChoroplethDotGrid, ChoroplethGraticule, ChoroplethMarker, ChoroplethBackground and ChoroplethTooltip to configure the map, plus any elements that call useChoropleth(), useChoroplethZoom() or useChoroplethCamera().

ariaLabel?string

Accessible label of the chart.

Default: "Choropleth chart"

ariaDescription?string

Longer accessible description of the chart.

ChoroplethFeatureComponent

PropType

fill?string

Solid fill color for every feature. Takes precedence over getFeatureColor.

Default: a cycle of the `--chart-scale-01` to `--chart-scale-05` variables, by feature index

stroke?string

Border color of the features.

Default: "var(--bkm-background)"

strokeWidth?number

Border width of the features in pixels.

Default: 0.5

fadedOpacity?number

Opacity of the other features while one is hovered or focused.

Default: 0.4

getFeatureColor?(feature: ChoroplethFeature, index: number) => string

Returns a fill color per feature. Used when fill is not set.

Type: (feature: ChoroplethFeature, index: number) => string

patterns?ReactNode

Pattern definitions (SVG <pattern> elements) that features can reference by id through getFeaturePattern.

getFeaturePattern?(feature: ChoroplethFeature, index: number) => string | null | undefined

Returns the id of a pattern to fill a feature with, or null/undefined to use the color. A pattern wins over fill and getFeatureColor.

Type: (feature: ChoroplethFeature, index: number) => string | null | undefined

ChoroplethDotGrid

PropType

gap?number

Distance between dot centres in pixels.

Default: 7

dotSize?number

Dot diameter as a fraction of gap (0 to 1).

Default: 0.7

zoomDotSize?number

Dot diameter (a fraction of gap) at the camera's largest zoom: the dots grow toward it as the camera zooms in.

Default: 0.9

hideOceanOnFocus?boolean

Fade the ocean dots out while the camera is focused on a region.

Default: true

lattice?ChoroplethDotLattice

The lattice: "hex" offsets every other row, "square" is a plain grid.

Default: "hex"

showOcean?boolean

Draw the grid over the oceans too, so the whole map is one dot field.

Default: true

oceanColor?string

Color of the ocean dots.

Default: "var(--chart-scale-01)"

oceanOpacity?number

Opacity of the ocean dots.

Default: 0.55

oceanDotScale?number

Size of the ocean dots relative to the land dots.

Default: 0.55

edgeFade?number

Fade the grid out toward the map's edges, as a percent of its width and height per side; 0 keeps hard edges.

Default: 12

fill?string

One color for every region's dots. Takes precedence over getFeatureColor.

getFeatureColor?(feature: ChoroplethFeature, index: number) => string

Returns the dot color of a region.

Type: (feature: ChoroplethFeature, index: number) => string

fadedOpacity?number

Opacity of the other regions while one is hovered.

Default: 0.4

ChoroplethGraticule

PropType

stroke?string

Color of the graticule lines.

Default: "var(--chart-graticule)", the theme's `--border`

strokeWidth?number

Width of the graticule lines in pixels.

Default: 0.5

step?[number, number]

Spacing of the lines as [longitude, latitude] in degrees.

Default: [10, 10]

hideOnFocus?boolean

Fade the lines out while the camera is focused on a region or a marker.

Default: true

ChoroplethMarker

PropType

coordinates[number, number]

Where the marker sits, as [longitude, latitude].

labelstring

Name shown in the tooltip (and beside the marker with showLabel).

shape?ChoroplethMarkerShape

The marker's shape.

Default: "circle"

size?number

Size in pixels; it stays this size while the map zooms.

Default: 9

color?string

Fill color.

Default: "var(--foreground)"

stroke?string

Outline color; without it the marker has no outline.

strokeWidth?number

Outline width in pixels (with stroke).

Default: 1.5

pulse?ChoroplethMarkerPulse

The ripple ring: off, while hovered or focused, or always. Reduced motion turns it off.

Default: "hover"

glow?number

Blur of a soft outer glow, in pixels; 0 turns it off.

Default: 0

showLabel?boolean

Always draw the label beside the marker.

Default: false

class?string

Additional class name for the marker's group.

ChoroplethBackground

PropType

pattern?PatternPresetId

Pattern preset. "none" draws nothing.

Default: "diagonal"

color?string

Color of the pattern strokes.

Default: "var(--chart-grid)"

showFill?boolean

Draw the pattern.

Default: true

opacity?number

Opacity of the pattern.

Default: 1

fadeHorizontal?boolean

Fade the pattern out at the left and right edges.

Default: true

fadeVertical?boolean

Fade the pattern out at the top and bottom edges.

Default: true

fadeHorizontalLength?number

Width of the horizontal fade zone, as a percent of the chart's width per edge (0 to 45).

Default: 10

fadeVerticalLength?number

Height of the vertical fade zone, as a percent of the chart's height per edge (0 to 45).

Default: 10

hideOnFocus?boolean

Fade the pattern out while the camera is focused.

Default: false

scale?number

Multiplies the tile size; the line width scales with it. 2 doubles it.

Default: 1

strokeWidth?number

Line width of the line presets, in tile units (multiplied by scale).

Default: 1

tileBackground?string

Solid colour painted under the pattern in each tile.

radius?number

Deprecated: No effect: only the earlier circle presets read it..

complement?boolean

Deprecated: No effect: only the earlier circle presets read it..

fill?string

Deprecated: No effect: only the earlier circle presets read it..

dotFill?boolean

Deprecated: No effect: only the earlier dot preset read it..

ChoroplethTooltip

PropType

content?(props: { feature: ChoroplethFeature; index: number }) => ReactNode

Custom tooltip content for a feature. Replaces the default name and value.

Type: (props: { feature: ChoroplethFeature; index: number }) => ReactNode

formatValue?(value: number) => string

Formats the value in the default tooltip.

Type: (value: number) => string
Default: integer formatting

getFeatureName?(feature: ChoroplethFeature, index: number) => string

Returns the tooltip title of a feature.

Type: (feature: ChoroplethFeature, index: number) => string
Default: the feature's `properties.name`, or "Feature <index>"

getFeatureValue?(feature: ChoroplethFeature, index: number) => number | undefined

Returns the value shown for a feature. When it returns undefined the value row is hidden.

Type: (feature: ChoroplethFeature, index: number) => number | undefined

valueLabel?string

Label of the value row.

Default: "Value"

class?string

Additional class name for the tooltip panel.

panelStyle?CSSProperties

Inline styles for the tooltip panel, for example a blur or border.

backgroundColor?string

Background color of the tooltip panel (a CSS variable or a color).

hideDelay?number

Grace period in milliseconds before the tooltip hides when the pointer leaves a feature for the sea or a border gap: a move onto the next feature within it carries the panel over instead of fading it out and back in.

Default: 120

Examples

9 examples on Solid, each live with its code and its own install command.

All 9 choropleth map examples

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Preview

Installation

Usage

Anatomy

Shading by value

Zoom and pan

A tilted camera

Markers

Dot grid

Patterns

Customization

Loading state

Animation

Theming

Accessibility

API reference

ChoroplethChart

ChoroplethFeatureComponent

ChoroplethDotGrid

ChoroplethGraticule

ChoroplethMarker

ChoroplethBackground

ChoroplethTooltip

Examples