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Expert Data Visualization

You're reading from   Expert Data Visualization Advanced information visualization with D3.js 4.x

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781786463494
Length 394 pages
Edition 1st Edition
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Author (1):
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Jos Dirksen Jos Dirksen
Author Profile Icon Jos Dirksen
Jos Dirksen
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Table of Contents (10) Chapters Close

Preface 1. Getting Started with D3 2. Basic Charts and Shapes FREE CHAPTER 3. Working with Hierarchical Data 4. Visualizing Graphs 5. Working with Geo Data 6. Visualizing Streaming Data 7. Voronoi Diagrams and Heatmaps 8. Custom Shapes and Paths and Using a Brush Selection 9. ES6, TypeScript, and External D3.js Libraries

Creating the visualization

This visualization will have the following features:

  • We're going to draw a line showing the ECG and respiratory information
  • We load two external SVG images, a heart and a set of lungs, and animate those based on the data we receive

We once again start with setting up the data structures and the scales.

Scales, lines, and array initialization

The first thing we need to do is define some variables:

var ecgAvg =  16800; 
var respAvg = 16000;
var n = 800;

var data = d3.range(n).map(function(d) {return {
"ecg": ecgAvg,
"resp": respAvg
}});

We use the ecgAvg and respAvg to prefill an array with our initial data. This will allow us to start our visualization with an empty line, while new data comes in. The n...

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