Table of Contents for
Mastering OpenLayers 3

Version ebook / Retour

Cover image for bash Cookbook, 2nd Edition Mastering OpenLayers 3 by Gábor Farkas Published by Packt Publishing, 2016
  1. Cover
  2. Table of Contents
  3. Mastering OpenLayers 3
  4. Mastering OpenLayers 3
  5. Credits
  6. About the Author
  7. About the Reviewer
  8. www.PacktPub.com
  9. Preface
  10. What you need for this book
  11. Who this book is for
  12. Conventions
  13. Reader feedback
  14. Customer support
  15. 1. Creating Simple Maps with OpenLayers 3
  16. Structure of OpenLayers 3
  17. Building the layout
  18. Using the API documentation
  19. Debugging the code
  20. Summary
  21. 2. Applying Custom Styles
  22. Customizing the default appearance
  23. Styling vector layers
  24. Customizing the appearance with JavaScript
  25. Creating a WebGIS client layout
  26. Summary
  27. 3. Working with Layers
  28. Building a layer tree
  29. Adding layers dynamically
  30. Adding vector layers with the File API
  31. Adding vector layers with a library
  32. Removing layers dynamically
  33. Changing layer attributes
  34. Changing the layer order with the Drag and Drop API
  35. Clearing the message bar
  36. Summary
  37. 4. Using Vector Data
  38. Accessing attributes
  39. Setting attributes
  40. Validating attributes
  41. Creating thematic layers
  42. Saving vector data
  43. Saving with WFS-T
  44. Modifying the geometry
  45. Summary
  46. 5. Creating Responsive Applications with Interactions and Controls
  47. Building the toolbar
  48. Mapping interactions to controls
  49. Building a set of feature selection controls
  50. Adding new vector layers
  51. Building a set of drawing tools
  52. Modifying and snapping to features
  53. Creating new interactions
  54. Building a measuring control
  55. Summary
  56. 6. Controlling the Map – View and Projection
  57. Customizing a view
  58. Constraining a view
  59. Creating a navigation history
  60. Working with extents
  61. Rotating a view
  62. Changing the map's projection
  63. Creating custom animations
  64. Summary
  65. 7. Mastering Renderers
  66. Using different renderers
  67. Creating a WebGL map
  68. Drawing lines and polygons with WebGL
  69. Blending layers
  70. Clipping layers
  71. Exporting a map
  72. Creating a raster calculator
  73. Creating a convolution matrix
  74. Clipping a layer with WebGL
  75. Summary
  76. 8. OpenLayers 3 for Mobile
  77. Responsive styling with CSS
  78. Generating geocaches
  79. Adding device-dependent controls
  80. Vectorizing the mobile version
  81. Making the mobile application interactive
  82. Summary
  83. 9. Tools of the Trade – Integrating Third-Party Applications
  84. Exporting a QGIS project
  85. Importing shapefiles
  86. Spatial analysis with Turf
  87. Spatial analysis with JSTS
  88. 3D rendering with Cesium
  89. Summary
  90. 10. Compiling Custom Builds with Closure
  91. Configuring Node JS
  92. Compiling OpenLayers 3
  93. Bundling an application with OpenLayers 3
  94. Extending OpenLayers 3
  95. Creating rich documentation with JSDoc
  96. Summary
  97. Index

Chapter 2. Applying Custom Styles

We covered the basics of the library in the previous chapter. Before moving on and learning how to code great applications with the library, we will cover the basics of applying custom styles with CSS and the methods offered by OpenLayers 3. The CSS part requires some basic knowledge in styling, but the more advanced techniques will be discussed in greater details.

In this chapter, we will cover the following topics:

  • Modifying the default appearance of the map with CSS
  • Applying custom styles to vector layers
  • Customizing controls
  • Creating a WebGIS application layout

Before getting started

Before moving on and customizing the default appearance, we should talk about its rendering process. OpenLayers 3 is a canvas-based web mapping library, which means that it draws everything it can on a single canvas element. This not only makes the rendering process faster, but also prevents direct styling with CSS. However, there are some parts rendered as pure DOM elements. These parts, specifically the controls, overlays, and drag boxes, can be styled directly. For the other parts, like vector data, the capabilities of the canvas element can be used for styling, mostly with inner methods. We will discuss rendering in a later chapter in more detail. For now, keeping this nature of the library in mind should be enough.

Tip

Using the DOM renderer opens up new possibilities in CSS styling. However, it cannot render vector data in SVG format; therefore, you can only style image layers directly. The library also loses performance; thus, using the DOM renderer should be considered as a generally bad practice. Renderers in OpenLayers 3 will be discussed in more detail in Chapter 7, Mastering the Renderers.

Basic considerations

From now on, step by step, we will make a simple WebGIS application with OpenLayers 3. In most of the chapters, we will extend the code created in the previous one. To make it clear, we will consider the current goal at the beginning of every chapter.

In this chapter, after a few warm-up examples, we will make the layout of our application. We will make a highly adaptable full-screen application; therefore, we will use relative units whenever it is possible. We will also make sure that our design does not prevent the usage of the default one. For now, the application will have three parts. The map canvas will display the map, the toolbar will contain the control buttons (the tools), and the notification bar will inform the user about the state of our application in various ways.