Table of Contents for
OpenLayers 3.x Cookbook - Second Edition

Version ebook / Retour

Cover image for bash Cookbook, 2nd Edition OpenLayers 3.x Cookbook - Second Edition by Antonio Santiago Perez Published by Packt Publishing, 2016
  1. Cover
  2. Table of Contents
  3. OpenLayers 3.x Cookbook Second Edition
  4. OpenLayers 3.x Cookbook Second Edition
  5. Credits
  6. About the Authors
  7. About the Reviewer
  8. www.PacktPub.com
  9. Preface
  10. What you need for this book
  11. Who this book is for
  12. Sections
  13. Conventions
  14. Reader feedback
  15. Customer support
  16. 1. Web Mapping Basics
  17. Creating a simple fullscreen map
  18. Playing with the map's options
  19. Managing the map's stack layers
  20. Managing the map's controls
  21. Moving around the map view
  22. Restricting the map's extent
  23. 2. Adding Raster Layers
  24. Using Bing imagery
  25. Using OpenStreetMap imagery
  26. Adding WMS layers
  27. Changing the zoom effect
  28. Changing layer opacity
  29. Buffering the layer data to improve map navigation
  30. Creating an image layer
  31. Setting the tile size in WMS layers
  32. 3. Working with Vector Layers
  33. Adding a GML layer
  34. Adding a KML layer
  35. Creating features programmatically
  36. Exporting features as GeoJSON
  37. Reading and creating features from a WKT
  38. Using point features as markers
  39. Removing or cloning features using overlays
  40. Zooming to the extent of a layer
  41. Adding text labels to geometry points
  42. Adding features from a WFS server
  43. Using the cluster strategy
  44. Reading features directly using AJAX
  45. Creating a heat map
  46. 4. Working with Events
  47. Creating a side-by-side map comparator
  48. Implementing a work-in-progress indicator for map layers
  49. Listening for the vector layer features' events
  50. Listening for mouse or touch events
  51. Using the keyboard to pan or zoom
  52. 5. Adding Controls
  53. Adding and removing controls
  54. Working with geolocation
  55. Placing controls outside the map
  56. Drawing features across multiple vector layers
  57. Modifying features
  58. Measuring distances and areas
  59. Getting feature information from a data source
  60. Getting information from a WMS server
  61. 6. Styling Features
  62. Styling layers
  63. Styling features based on geometry type
  64. Styling based on feature attributes
  65. Styling interaction render intents
  66. Styling clustered features
  67. 7. Beyond the Basics
  68. Working with projections
  69. Creating a custom control
  70. Selecting features by dragging out a selection area
  71. Transitioning between weather forecast imagery
  72. Using the custom OpenLayers library build
  73. Drawing in freehand mode
  74. Modifying layer appearance
  75. Adding features to the vector layer by dragging and dropping them
  76. Making use of map permalinks
  77. Index

Chapter 6. Styling Features

In this chapter we will cover the following topics:

  • Styling layers
  • Styling features based on geometry type
  • Styling based on feature attributes
  • Styling interaction render intents
  • Styling clustered features

Introduction

Once we know how to work with vector layers, such as adding new features or modifying existing ones, the question that we may have in mind is: how do we style them? We have seen examples of feature styling in previous recipes in this book, but this chapter will take a deeper look into what we can do with styles and how styling operates in OpenLayers.

The visual representation of features is one of the most important concepts in GIS applications. It is not only important from the user's experience or the designer's perspective, but it is also important as an information requirement, for example, to identify features that match certain conditions.

The way that we visualize features is not only important to make our application much more attractive, but it is also important to improve the way that we bring information to the user. For example, assuming that a set of points represent some temperatures, if we are interested in the hottest zones, we could represent them with different radius and color values. This way, a lesser radius and a color near to blue would mean that the zone is a cold zone, while a greater radius and a color near to red would mean a hot zone.

OpenLayers offers us a great degree of flexibility when styling features. We can use static styles or dynamic styles that are influenced by feature attributes. Styles can be created through various methods, such as from style functions (ol.style.StyleFunction), or by applying new style instances (ol.style.Style) directly to a feature or layer.

Let's take a look at all of this in the following recipes.