Book Image

Google Maps JavaScript API Cookbook

Book Image

Google Maps JavaScript API Cookbook

Overview of this book

Day by day, the use of location data is becoming more and more popular, and Google is one of the main game changers in this area. The Google Maps JavaScript API is one of the most functional and robust mapping APIs used among Geo developers. With Google Maps, you can build location-based apps, maps for mobile apps, visualize geospatial data, and customize your own maps.Google Maps JavaScript API Cookbook is a practical, hands-on guide that provides you with a number of clear, step-by-step recipes that will help you to unleash the capabilities of the Google Maps JavaScript API in conjunction with open source or commercial GIS servers and services through a number of practical examples of real world scenarios. This book begins by covering the essentials of including simple maps for Web and mobile, adding vector and raster layers, styling your own base maps, creating your own controls and responding to events, and including your own events.You will learn how to integrate open source or commercial GIS servers and services including ArcGIS Server, GeoServer, CartoDB, Fusion Tables, and Google Maps Engine with the Google Maps JavaScript API. You will also extend the Google Maps JavaScript API to push its capabilities to the limit with additional libraries and services including geometry, AdSense, geocoding, directions, and StreetView.This book covers everything you need to know about creating a web map or GIS applications using the Google Maps JavaScript API on multiple platforms.
Table of Contents (15 chapters)
Google Maps JavaScript API Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Calculating the length/area of polylines and polygons


As described in the first recipe of this chapter—Drawing shapes on the map—you can draw your shapes as per your taste. But how about getting some information about these shapes, for instance, information about their length and area?

The Google Maps JavaScript API places the opportunity to gather this information in the geometry library. From this library, you can access the static utility functions that give information on the length/area calculations and so on.

This recipe will show us how to get the length and area information of the arbitrary shapes drawn.

Getting ready

Having a sneak preview at the Drawing shapes on the map recipe will ease your work, as much detail on drawing shapes and their background is needed.

How to do it...

You can view the area and length information of your shapes by carrying out the following steps:

  1. Add the drawing and geometry libraries to the bootstrap URL:

    <script type="text/javascript"
        src="https://maps...