JavaScript D3.js

D3.js

D3.js is a JavaScript library for manipulating HTML data and is easy to use.

How to Use D3.js

To use D3.js in your web page, add a link to the library:

<script src="https://d3js.org/d3.v3.min.js"></script>

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This script selects the body element and appends a paragraph with the text "Hello World!":

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

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Scatter Plot Example

Visualization:

Source Code:

// 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")
  .attr("width", xSize)
  .attr("height", ySize)
  .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("circle")
  .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");