Section 1.1: Installing Necessary Packages

To begin, we need to install a few essential modules. Execute the following command in your terminal:

npm install @visx/curve @visx/gradient @visx/group @visx/mock-data @visx/responsive @visx/scale @visx/shape

Section 1.2: Constructing the Radial Line

With the required packages installed, we can proceed to create our radial line chart. We will utilize data from the @visx/mock-data module.

Here’s how to create the radial line chart:

import React, { useRef, useState, useEffect } from "react";

import { Group } from "@visx/group";

import { LineRadial } from "@visx/shape";

import { scaleTime, scaleLog } from "@visx/scale";

import { curveBasisOpen } from "@visx/curve";

import appleStock from "@visx/mock-data/lib/mocks/appleStock";

import { LinearGradient } from "@visx/gradient";

import { animated, useSpring } from "react-spring";

const green = "#e5fd3d";

export const blue = "#aeeef8";

const darkgreen = "#dff84d";

export const background = "#744cca";

const darkbackground = "#603FA8";

const springConfig = { tension: 20 };

// Utility function to determine the extent of data

function extent(data, value) {

const values = data.map(value);

return [Math.min(...values), Math.max(...values)];

}

// Accessor functions for data

const date = (d) => new Date(d.date).valueOf();

const close = (d) => d.close;

// Scale definitions

const xScale = scaleTime({

range: [0, Math.PI * 2],

domain: extent(appleStock, date)

});

const yScale = scaleLog({

domain: extent(appleStock, close)

});

const angle = (d) => xScale(date(d)) ?? 0;

const radius = (d) => yScale(close(d)) ?? 0;

const firstPoint = appleStock[0];

const lastPoint = appleStock[appleStock.length - 1];

const Example = ({ width, height, animate = true }) => {

const lineRef = useRef(null);

const [lineLength, setLineLength] = useState(0);

const [shouldAnimate, setShouldAnimate] = useState(false);

const spring = useSpring({

frame: shouldAnimate ? 0 : 1,

config: springConfig,

onRest: () => setShouldAnimate(false)

});

useEffect(() => {

if (lineRef.current) {

setLineLength(lineRef.current.getTotalLength());

}

}, [lineRef.current]);

if (width < 10) return null;

yScale.range([0, height / 2 - 20]);

const yScaleTicks = yScale.ticks();

const handlePress = () => setShouldAnimate(true);

return (

<>

{animate && (

<button onClick={handlePress}>Animate</button>

)}

<Group>

{yScaleTicks.map((tick, i) => (

<text key={i} x={0} y={yScale(tick)}>{tick}</text>

))}

{yScaleTicks.map((tick, i) => (

<circle key={i} cx={0} cy={yScale(tick)} r={1} />

))}

<LineRadial

data={appleStock}

angle={angle}

radius={radius}

ref={lineRef}

strokeDasharray={lineLength}

stroke={green}

/>

{[firstPoint, lastPoint].map((d, i) => {

const cx = ((xScale(date(d)) ?? 0) * Math.PI) / 180;

const cy = -(yScale(close(d)) ?? 0);

return (

<circle key={i} cx={cx} cy={cy} r={5} fill={blue} />

);

})}

</Group>

</>

);

};

export default function App() {

return <Example width={500} height={500} />;

}

In this code, we set colors for the lines and the background using the defined variables. The extent function generates an array of numbers representing the minimum and maximum values from the data. The date and close functions serve as accessors to retrieve time and value data, respectively. Scales for both the x and y axes are created to facilitate the radial line's construction.

For the animation, the shouldAnimate state controls when the line filling occurs. The Group component includes circles to represent concentric rings, while text elements display the values for each ring. The LineRadial component draws the line based on the values provided by the angle and radius functions.