OpenLayers 3.x Cookbook - Second Edition

OpenLayers 3.x Cookbook - Second Edition

By : Peter J. Langley, Antonio Santiago Perez

Buy this Book

OpenLayers 3.x Cookbook - Second Edition

By: Peter J. Langley, Antonio Santiago Perez

Buy this Book

Overview of this book

OpenLayers 3 is one of the most important and complete open source JavaScript mapping libraries today. Throughout this book, you will go through recipes that expose various features of OpenLayers 3, allowing you to gain an insight into building complex GIS web applications. You will get to grips with the basics of creating a map with common functionality and quickly advance to more complicated solutions that address modern challenges. You will explore into maps, raster and vector layers, and styling in depth. This book also includes problem solving and how-to recipes for the most common and important tasks.

OpenLayers 3.x Cookbook Second Edition

Credits

About the Authors

About the Reviewer

www.PacktPub.com

Preface

Free Chapter

Web Mapping Basics

Introduction

Creating a simple fullscreen map

Playing with the map's options

Managing the map's stack layers

Managing the map's controls

Moving around the map view

Restricting the map's extent

Adding Raster Layers

Introduction

Using Bing imagery

Using OpenStreetMap imagery

Adding WMS layers

Changing the zoom effect

Changing layer opacity

Buffering the layer data to improve map navigation

Creating an image layer

Setting the tile size in WMS layers

Working with Vector Layers

Introduction

Adding a GML layer

Adding a KML layer

Creating features programmatically

Exporting features as GeoJSON

Reading and creating features from a WKT

Using point features as markers

Removing or cloning features using overlays

Zooming to the extent of a layer

Adding text labels to geometry points

Adding features from a WFS server

Using the cluster strategy

Reading features directly using AJAX

Creating a heat map

Working with Events

Introduction

Creating a side-by-side map comparator

Implementing a work-in-progress indicator for map layers

Listening for the vector layer features' events

Listening for mouse or touch events

Using the keyboard to pan or zoom

Adding Controls

Introduction

Adding and removing controls

Working with geolocation

Placing controls outside the map

Drawing features across multiple vector layers

Modifying features

Measuring distances and areas

Getting feature information from a data source

Getting information from a WMS server

Styling Features

Introduction

Styling layers

Styling features based on geometry type

Styling based on feature attributes

Styling interaction render intents

Styling clustered features

Beyond the Basics

Introduction

Working with projections

Creating a custom control

Selecting features by dragging out a selection area

Transitioning between weather forecast imagery

Using the custom OpenLayers library build

Drawing in freehand mode

Modifying layer appearance

Adding features to the vector layer by dragging and dropping them

Making use of map permalinks

Index

Customer Reviews

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Listening for mouse or touch events

So far, in this chapter, we've looked at how to respond to events that OpenLayers itself publishes, such as tile load events and vector feature events, such as feature added. However, what about user-driven gestures and interactions with the map? This recipe takes a look at some of these types of events.

We'll demonstrate the click or tap and map panning events. When the user clicks on or touches the map, the geometry and pixel coordinates will be displayed in the sidebar. When the map is panned, the new visible extent of the map will be displayed in the sidebar as well.

The source code can be found in ch04/ch04-mouse-touch-events, and here's a screenshot of what this will look like:

How to do it…

To set up and subscribe to some user-driven events, follow these steps:

Create an HTML file and include the OpenLayers dependencies. In particular, include the div element for the map and the markup for the side panel and content:
```
<div id="js-map" class="map"&gt...
```

OpenLayers 3.x Cookbook - Second Edition

By : Peter J. Langley, Antonio Santiago Perez

OpenLayers 3.x Cookbook - Second Edition

By: Peter J. Langley, Antonio Santiago Perez

Overview of this book

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Listening for mouse or touch events

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