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OpenLayers 2.10 Beginner's Guide

You're reading from   OpenLayers 2.10 Beginner's Guide Create, optimize, and deploy stunning cross-browser web maps with the OpenLayers JavaScript web mapping library

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Product type Paperback
Published in Mar 2011
Publisher
ISBN-13 9781849514125
Length 372 pages
Edition Edition
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Toc

Table of Contents (18) Chapters Close

OpenLayers 2.10
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started with OpenLayers FREE CHAPTER 2. Squashing Bugs With Firebug 3. The 'Layers' in OpenLayers 4. Wrapping Our Heads Around Projections 5. Interacting with Third Party APIs 6. Taking Control of Controls 7. Styling Controls 8. Charting the Map Class 9. Using Vector Layers 10. Vector Layer Style Guide 11. Making Web Map Apps Index

Geometry and Feature classes


We've been using feature objects throughout the chapter so far without really talking about the Feature class itself. We also have hinted at the Geometry class, but we haven't gone into any detail so far. This section will cover both classes in a bit more detail so that you can gain a bit more confidence working with them. Don't worry—it's easy, you've already been exposed to both classes.

Before we get into the Feature class though, we should go over the Geometry class, as it's used to create the actual geometry objects that make up a feature object.

Geometry class

The Geometry class is, more or less, the foundation of the feature objects we've seen so far. Specifically, up to this point, we have been using the Feature.Vector class as the base class for our feature objects. We'll talk more about that shortly, but for now it is just important to know that the Feature.Vector class uses the Geometry class to store geometry information about a feature.

But what exactly...

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