Book Image

D3.js By Example

By : Michael Heydt
Book Image

D3.js By Example

By: Michael Heydt

Overview of this book

<p>This book will take you through all the concepts of D3.js starting with the most basic ones and progressively building on them in each chapter to expand your knowledge of D3.js.</p> <p>Starting with obtaining D3.js and creating simple data bindings to non-graphical HTML elements, you will then master the creation of graphical elements from data. You’ll discover how to combine those elements into simple visualizations such as bar, line, and scatter charts, as well as more elaborate visualizations such as network diagrams, Sankey diagrams, maps, and choreopleths.</p> <p>Using practical examples provided, you will quickly get to grips with the features of D3.js and use this learning to create your own spectacular data visualizations with D3.js.</p>
Table of Contents (20 chapters)
D3.js By Example
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
5
Using Data and Scales
Index

Applying SVG transforms


The S in SVG stands for Scalable, while V stands for Vector. These are the two important parts of the name. This allows us to be able to apply a variety of transforms prior to the rendering of SVG shapes.

Each SVG shape is represented by one or more vectors, where a vector in SVG is a tuple (x, y) distance from an origin in the coordinate system. As an example, a rectangle will be represented by four 2D vectors, one for each corner of the rectangle.

When creating graphical visualizations, this modeling of data with vectors has several benefits. One of those is that we can define a shape around a coordinate system for just that shape. Modeling this way allows us to make copies of the shape, but position them in different places in a larger image, rotate them, scale them, and perform many other operations beyond the scope of this text.

Secondly, these transformations are applied on the model before being rendered into pixels on the screen. Because of this, SVG can ensure...