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Learning D3.js Mapping

You're reading from   Learning D3.js Mapping Build stunning maps and visualizations using D3.js

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Product type Paperback
Published in Dec 2014
Publisher
ISBN-13 9781783985609
Length 126 pages
Edition 1st Edition
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Authors (2):
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Thomas Newton Thomas Newton
Author Profile Icon Thomas Newton
Thomas Newton
Oscar Villarreal Oscar Villarreal
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Oscar Villarreal
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Toc

Table of Contents (9) Chapters Close

Preface 1. Gather Your Cartographer's Toolbox FREE CHAPTER 2. Creating Images from Simple Text 3. Producing Graphics from Data – the Foundations of D3 4. Creating a Map 5. Click-click Boom! Applying Interactivity to Your Map 6. Finding and Working with Geographic Data 7. Testing Index

Line


The SVG line is one of the simplest in the library. It draws a straight line from one point to another. The syntax is very straightforward and can be experimented with at http://localhost:8080/chapter-2/line.html, assuming the http-server is running:

<line x1="10" y1="10" x2="100" y2="100" stroke-width="1" stroke="red"/>

This will give you the following output:

A description of the element's attributes is as follows:

  • x1 and y1: The starting x and y coordinates

  • x2 and y2: The ending x and y coordinates

  • stroke: This gives the line a red color

  • stroke-width: This denotes in pixels the width of the line to be drawn

The line tag also has the ability to change the style of the end of the line. For example, adding the following would change the image so it has round endings:

stroke-linecap: round;

As stated earlier, all SVG tags can also be styled with CSS elements. An alternative way of producing the same graphic would be to first create a CSS style, as shown in the following code:

      line ...
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