# Surface Wind Directional Polar Scatter

> 2D polar coordinate distribution plotting wind speed and angle heading.

A shadcn/ui block from the [@pacekit](https://ui.pacekit.dev/?utm_source=shadcn.exchange) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/pacekit/tanstack-charts-polar-scatter).

- Page, with a live preview: https://shadcn.exchange/r/pacekit/tanstack-charts-polar-scatter
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/pacekit/tanstack-charts-polar-scatter-light-8e100113afbbd70c.png
- Registry item: https://ui.pacekit.dev/r/tanstack-charts-polar-scatter.json
- Listed: 2026-10-21, source last changed 2026-10-21

## Install

```bash
npx shadcn@latest add https://shadcn.exchange/r/pacekit/tanstack-charts-polar-scatter.json
```

Run it in a project that has shadcn/ui set up. It adds the files below and installs what they depend on.

## Dependencies

- npm packages: `@tanstack/charts`, `@tanstack/react-charts`, `d3-scale`
- Registry items: `card`

## Files

### `components/tanstack-charts/line/polar-scatter.tsx`

```tsx
import { type ChartPoint, defineChart } from "@tanstack/charts";
import { motion } from "@tanstack/charts/motion";
import { angleGrid, polar, radialDot, radialGrid } from "@tanstack/charts/polar";
import { tooltip } from "@tanstack/charts/tooltip";
import { Chart } from "@tanstack/react-charts/core";
import { useMemo } from "react";

import { scaleLinear } from "d3-scale";
import { CircleDot } from "lucide-react";

import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from "@/components/ui/card";

interface PolarWindDatum {
    id: number;
    direction: number;
    speed: number;
    station: string;
}

const motionRenderer = motion({
    initial: "always",
    transition: { type: "spring", stiffness: 170, damping: 18, mass: 1 },
});

const angleDomain = [0, 360];
const radiusDomain = [0, 20];
const angleGridValues = [0, 45, 90, 135, 180, 225, 270, 315];
const radiusGridValues = [5, 10, 15, 20];

function generateDemoData(): PolarWindDatum[] {
    const results: PolarWindDatum[] = [];
    for (let i = 0; i < 40; i++) {
        const direction = Math.round(Math.random() * 360);
        const speed = Number((3 + Math.random() * 15).toFixed(1));
        results.push({
            id: i,
            direction,
            speed,
            station: `Station-${Math.floor(i / 10) + 1}`,
        });
    }
    return results;
}

function shadcnTooltipContent<TDatum>(points: readonly ChartPoint<TDatum>[]) {
    if (points.length === 0) return { title: "", rows: [] };
    const d = points[0].datum as PolarWindDatum;
    if (!d) return { title: "", rows: [] };
    return {
        title: `${d.station} (Bearing: ${d.direction}°)`,
        rows: [{ label: "Wind Velocity", value: `${d.speed} m/s`, color: "var(--chart-1)" }],
    };
}

export function PolarScatterChart() {
    const data = useMemo(() => generateDemoData(), []);

    const definition = useMemo(
        () =>
            defineChart(
                {
                    renderer: motionRenderer,
                    scales: {
                        x: null,
                        y: null,
                    },
                    marks: [
                        polar({
                            radiusRatio: 0.76,
                            scales: {
                                angle: { scale: scaleLinear().domain(angleDomain) },
                                radius: { scale: scaleLinear().domain(radiusDomain) },
                            },
                            guides: [
                                radialGrid({
                                    values: radiusGridValues,
                                    labels: false,
                                    stroke: "var(--border)",
                                    strokeOpacity: 0.5,
                                }),
                                angleGrid({
                                    values: angleGridValues,
                                    labels: false,
                                    stroke: "var(--border)",
                                    strokeOpacity: 0.5,
                                }),
                            ],
                            marks: [
                                radialDot(data, {
                                    id: "polar-scatter-dots",
                                    angle: "direction",
                                    radius: "speed",
                                    r: 4.5,
                                    fill: "var(--chart-1)",
                                    stroke: "var(--background)",
                                    strokeWidth: 1.5,
                                }),
                            ],
                        }),
                    ],
                    margin: { top: 20, right: 20, bottom: 20, left: 20 },
                    theme: {
                        foreground: "var(--muted-foreground)",
                        grid: "var(--border)",
                        background: "transparent",
                    },
                },
                {
                    keyboard: true,
                    tooltip: {
                        use: tooltip,
                        className:
                            "font-sans shadow-none rounded-md bg-popover text-popover-foreground border p-2 text-xs",
                        anchor: "pointer",
                        placement: "auto",
                        content: (points) => shadcnTooltipContent(points),
                    },
                },
            ),
        [data],
    );

    return (
        <Card className="w-full max-w-xl">
            <CardHeader>
                <CardTitle>Surface Wind Directional Polar Scatter</CardTitle>
                <CardDescription>
                    2D polar coordinate distribution plotting wind bearings and speed observations
                </CardDescription>
            </CardHeader>
            <CardContent>
                <div className="h-[270px] w-full">
                    <Chart
                        definition={definition}
                        renderer={motionRenderer}
                        height={270}
                        ariaLabel="Surface Wind Directional Polar Scatter Chart"
                    />
                </div>
            </CardContent>
            <CardFooter className="flex-col items-start gap-2 text-sm">
                <div className="flex items-center gap-2 leading-none font-medium">
                    Multi-station wind velocity readings plotted by bearing{" "}
                    <CircleDot className="h-4 w-4 text-emerald-500" />
                </div>
                <div className="text-muted-foreground leading-none">
                    `radialDot` projects discrete observation points onto polar coordinate space
                </div>
            </CardFooter>
        </Card>
    );
}

export default PolarScatterChart;
```