Section 1.1: Installing Necessary Packages

To begin, we need to install several essential modules. Execute the following command in your terminal to set everything up:

npm install @visx/clip-path @visx/event @visx/mock-data @visx/responsive @visx/scale @visx/zoom d3-scale-chromatic

Section 1.2: Creating the Graphics

We can start crafting our chart by leveraging the components provided by these modules. For our example, we will utilize data from the @visx/mock-data module. Below is the code snippet to create a chord diagram:

import React, { useState } from "react";

import { interpolateRainbow } from "d3-scale-chromatic";

import { Zoom } from "@visx/zoom";

import { localPoint } from "@visx/event";

import { RectClipPath } from "@visx/clip-path";

import genPhyllotaxis from "@visx/mock-data/lib/generators/genPhyllotaxis";

import { scaleLinear } from "@visx/scale";

const bg = "#0a0a0a";

const points = [...new Array(1000)];

const colorScale = scaleLinear({ range: [0, 1], domain: [0, 1000] });

const sizeScale = scaleLinear({ domain: [0, 600], range: [0.5, 8] });

const initialTransform = {

scaleX: 1.27,

scaleY: 1.27,

translateX: -211.62,

translateY: 162.59,

skewX: 0,

skewY: 0

};

function Example({ width, height }) {

const [showMiniMap, setShowMiniMap] = useState(true);

const generator = genPhyllotaxis({

radius: 5,

width,

height

});

const phyllotaxis = points.map((d, i) => generator(i));

return (

<>

{(zoom) => (

<>

<Zoom

{...{

initialTransform,

onZoom: (event) => {

const point = localPoint(event) || { x: 0, y: 0 };

zoom.scale({ scaleX: 1.1, scaleY: 1.1, point });

},

onDoubleClick: (event) => {

const point = localPoint(event) || { x: 0, y: 0 };

zoom.scale({ scaleX: 1.2, scaleY: 1.2 });

},

}}

>

{phyllotaxis.map(({ x, y }, i) => (

<circle key={i} cx={x} cy={y} r={sizeScale(i)} fill={interpolateRainbow(colorScale(i) ?? 0)} />

))}

{showMiniMap && (

<g>

{phyllotaxis.map(({ x, y }, i) => (

<circle key={i} cx={x} cy={y} r={sizeScale(i)} fill={interpolateRainbow(colorScale(i) ?? 0)} />

))}

<rect x={0} y={0} width={width} height={height} fill="transparent" />

</g>

)}

</Zoom>

<button onClick={() => zoom.scale({ scaleX: 0.8, scaleY: 0.8 })}>-</button>

<button onClick={() => zoom.scale({ scaleX: 1.2, scaleY: 1.2 })}>+</button>

<button onClick={() => setShowMiniMap(!showMiniMap)}>

{showMiniMap ? "Hide" : "Show"} Mini Map

</button>

</>

)}

</>

);

}

export default function App() {

return <Example width={800} height={500} />;

}

In this code snippet, we set the background color using the bg variable. The points array will be populated with values for the phyllotaxis spiral graphic that allows zooming and panning. The initialTransform object specifies the starting zoom and pan parameters.