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D3.js Quick Start Guide

You're reading from   D3.js Quick Start Guide Create amazing, interactive visualizations in the browser with JavaScript

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789342383
Length 180 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Matthew Huntington Matthew Huntington
Author Profile Icon Matthew Huntington
Matthew Huntington
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Table of Contents (10) Chapters Close

Preface 1. Getting Started with D3.js 2. Using SVG to Create Images Using Code FREE CHAPTER 3. Building an Interactive Scatter Plot 4. Making a Basic Scatter Plot Interactive 5. Creating a Bar Graph Using a Data File 6. Animating SVG Elements to Create an Interactive Pie Chart 7. Using Physics to Create a Force-Directed Graph 8. Mapping 9. Other Books You May Enjoy

Specifying how the simulation affects visual elements

At this point, our visualization still looks the same, as indicated by the following screenshot:

Let's make our simulation affect the circles/lines that we created, as follows:

  • The simulation runs ticks, which run very quickly. Think of this a series of steps that happen very quickly, like the ticking of a stopwatch, but faster.
  • Each time a new tick occurs, you can update the visual elements. This allows our simulation to animate.
  • D3 will calculate and tack positional data onto our regular data, so that we can make use of it.

Add the following to the bottom of app.js:

d3.forceSimulation()
    .nodes(nodesData)
    .on("tick", function(){
        nodes.attr("cx", function(datum) {return datum.x;})
            .attr("cy", function(datum) {return datum.y;});

        links.attr("x1...
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