JS D3.js

D3.js is a JavaScript library for manipulating HTML data, and it is user-friendly.

How to Use D3.js?

To incorporate D3.js into your web page, include a link to the library.

This script targets the body element and adds a paragraph containing the text “Hello World!”.

d3.select(“body”).append(“p”).text(“Hello World!”);

Scatter Plot

Example

// Set Dimensions
const xSize = 500;
const ySize = 500;
const margin = 40;
const xMax = xSize – margin*2;
const yMax = ySize – margin*2;

// Create Random Points
const numPoints = 100;
const data = [];
for (let i = 0; i < numPoints; i++) {
  data.push([Math.random() * xMax, Math.random() * yMax]);
}

// Append SVG Object to the Page
const svg = d3.select(“#myPlot”)
  .append(“svg”)
  .append(“g”)
  .attr(“transform”,“translate(“ + margin + “,” + margin + “)”);

// X Axis
const x = d3.scaleLinear()
  .domain([0, 500])
  .range([0, xMax]);

svg.append(“g”)
  .attr(“transform”, “translate(0,” + yMax + “)”)
  .call(d3.axisBottom(x));

// Y Axis
const y = d3.scaleLinear()
  .domain([0, 500])
  .range([ yMax, 0]);

svg.append(“g”)
  .call(d3.axisLeft(y));

// Dots
svg.append(‘g’)
  .selectAll(“dot”)
  .data(data).enter()
  .append(“circle”)
  .attr(“cx”, function (d) { return d[0] } )
  .attr(“cy”, function (d) { return d[1] } )
  .attr(“r”, 3)
  .style(“fill”, “Red”);