Section 1.1: Setting Up Your Project

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

npm install @visx/clip-path @visx/event @visx/gradient @visx/group @visx/responsive @visx/voronoi

This command installs the necessary modules to work with Voronoi diagrams.

Section 1.2: Crafting the Diagram

Now, let's create the diagram using the components provided by the modules. We will utilize mock data from the @visx/mock-data library. Below is a sample code snippet to create a Voronoi diagram:

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

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

import { GradientOrangeRed, GradientPinkRed } from "@visx/gradient";

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

import { voronoi, VoronoiPolygon } from "@visx/voronoi";

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

const data = new Array(150).fill(null).map(() => ({

x: Math.random(),

y: Math.random(),

id: Math.random().toString(36).slice(2)

}));

const neighborRadius = 75;

const defaultMargin = {

top: 0,

left: 0,

right: 0,

bottom: 76

};

const Example = ({ width, height, margin = defaultMargin }) => {

const innerWidth = width - margin.left - margin.right;

const innerHeight = height - margin.top - margin.bottom;

const voronoiLayout = useMemo(

() =>

voronoi({

x: (d) => d.x * innerWidth,

y: (d) => d.y * innerHeight,

width: innerWidth,

height: innerHeight

})(data),

[innerWidth, innerHeight]

);

const polygons = voronoiLayout.polygons();

const svgRef = useRef(null);

const [hoveredId, setHoveredId] = useState(null);

const [neighborIds, setNeighborIds] = useState(new Set());

return width < 10 ? null : (

<svg ref={svgRef} width={width} height={height}>

<RectClipPath id="clip" />

{polygons.map((polygon) => (

<VoronoiPolygon key={polygon.id} polygon={polygon} />

))}

{data.map(({ x, y, id }) => (

<circle key={id} cx={x * innerWidth} cy={y * innerHeight} r={5} />

))}

</svg>

);

};

export default function App() {

return <Example width={800} height={600} />;

}

In this code snippet, we create an array of data points, each containing x and y coordinates along with a unique ID. The neighborRadius determines how far we should look for neighboring partitions when hovered over, while defaultMargin sets the margins for the diagram.

Section 2.1: Enhancing User Interaction

The Example component contains the Voronoi diagram, and we compute the inner width and height to define the display area. The voronoiLayout variable calculates the layout based on the diagram's dimensions.

We incorporate the GradientOrangeRed gradient to highlight the partition currently being hovered over, while GradientPinkRed serves as the default color gradient for other partitions. The onMouseMove event handler detects which partition is closest to the cursor and updates the state to highlight neighboring polygons.

In this second video, "Data Visualization with D3, React, visx and Typescript: 11 - Creating a Bar Chart with visx - 1," we explore additional visualization techniques using the D3 library alongside Visx and React, showcasing diverse data representation methods.