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OpenLayers 2.10 Beginner's Guide

OpenLayers 2.10 Beginner's Guide

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OpenLayers 2.10 Beginner's Guide

OpenLayers 2.10 Beginner's Guide

4.2 (9)
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Overview of this book

Table of Contents (18 chapters)
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OpenLayers 2.10
OpenLayers 2.10
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Getting Started with OpenLayers
Getting Started with OpenLayers
What is OpenLayers?
What, technically, is OpenLayers?
Anatomy of a web-mapping application
Relation to Google / Yahoo! / and other mapping APIs
The OpenLayers website
Time for action – downloading OpenLayers
Time for action – creating your first map
How the code works
Behind the scenes—Object Oriented Programming (OOP)
Time for Action – play MadLibs
Now what?
Where to go for help
OpenLayers source code repository
Summary
2
Squashing Bugs With Firebug
Squashing Bugs With Firebug
What is Firebug?
Setting up Firebug
Time for Action – downloading Firebug
Firebug controls
Panel conclusion
Using the Console panel
Time for Action – executing code in the Console
Time for Action – creating object literals
Time for Action – interacting with a map
Summary
3
The 'Layers' in OpenLayers
The 'Layers' in OpenLayers
What's a layer?
Layers in OpenLayers
Time for Action – creating a map with multiple layers
Creating layer objects
Time for Action – configuring the options parameter
Configuring layer options
Map tiles
Available layer properties
The OpenLayers.Layer class
Other layer types
Time for Action – creating a Google Maps layer
Time for Action – using the image layer
Accessing layer objects
Time for Action – accessing map.layers
Time for Action – accessing layer objects in Firebug
Layer class methods
Time for Action – defining a global layer object variable
Summary
4
Wrapping Our Heads Around Projections
Wrapping Our Heads Around Projections
Map projections
Time for Action – using different projection codes
Time for Action – determining LonLat coordinates
OpenLayers projection class
Transforming projections
Time for Action – coordinate transforms
Time for Action – setting up Proj4js.org
Summary
5
Interacting with Third Party APIs
Interacting with Third Party APIs
Third party mapping APIs
Google Maps
Time for Action – using Goole Maps V3 (standard way)
Time for Action – creating a Google Map layer with V2 (Deprecated)
Yahoo! Maps API
Time for Action – using the Yahoo! Maps Layer
Microsoft's mapping API
Time for Action – creating a Bing/Virtual Earth Layer
OpenStreetMap
Time for Action – creating an OpenStreetMap Layer
Spherical Mercator
Time for Action – using Spherical Mercator
Using Google Maps and other layers
Time For Action – creating your first mashup
Summary
6
Taking Control of Controls
Taking Control of Controls
What are controls?
Adding controls to your map
Time for Action – creating a map with no controls
Time for Action – adding controls to a map
OpenLayers.Control class
OpenLayers.Control subclasses
Time for Action – using attributions
Time for Action – using the NavigationHistory control
Panels
Time for Action – using Panels
Creating our own controls
Creating a custom button
Time for Action – creating a simple button
Events
Time for Action – creating a custom TYPE_TOGGLE control
Summary
7
Styling Controls
Styling Controls
What is CSS?
Time for Action – using external CSS files
OpenLayers and CSS
Time for Action – styling controls
Time for Action – styling the LayerSwitcher control
Other resources
Summary
8
Charting the Map Class
Charting the Map Class
The Map class
Map class properties
Time for Action – using the allOverlays Map property
Time for Action – setting zoom levels and maxExtent
Time for Action – using resolutions array
Time for Action – using Min and Max resolution
Time for Action – Using scales
Time for Action – working with Pan animations
Map functions
Time for Action – using control methods
Time for Action – using coordinate related functions
Doing stuff with events
Time for Action – using eventListeners
Time for Action – working with Map events
Multiple maps
Time for Action – using multiple map objects
Time for Action – creating a multiple map and custom event application
Summary
9
Using Vector Layers
chevron up
Using Vector Layers
What is the Vector Layer?
Time for Action – creating a Vector Layer
How the Vector Layer works
Time for Action – changing the Renderers array
Vector Layer class
Time for Action – adding features
Time for Action – destroying features
Time For Action – working with feature events
Vector Layer class events
Time For Action – using Vector Layer events
Time For Actions – working with more events
Geometry and Feature classes
Time for Action – using Geometry class methods
Time For Action – using the SelectFeature control
The Vector class, part two
Time for Action – creating a Vector Layer
Using the Vector Layer without a Protocol class
Time for Action – using the Format and Strategy classes alone
Format class
Strategy class
Summary
10
Vector Layer Style Guide
Vector Layer Style Guide
Styling the Vector Layer
Time For Action – applying some basic Styling
The StyleMap class
The Style class
Time for Action – common style examples
Attribute replacement
Time For Action – working with attribute replacement
Rules and filters
Time For Action – using addUniqueValueRules
Rules and filters
Time for Action – using rules and filters
OpenLayers.Rule class
OpenLayers.Filter class
Time For Action – figuring out logical filters
Summary
11
Making Web Map Apps
Making Web Map Apps
Development strategies
Creating a web map application using Flickr
Time For Action – getting Flickr data
Time for Action – adding data to your map
Time for Action – extract style
Turning our example into an application
Time for Action – adding some interactivity
Using real time data with a ProxyHost
Time for Action – getting dynamic data
Wrapping up the application
Time For Action – adding dynamic tags to your map
Deploying an application
Building the OpenLayers Library file
Time for Action – building a Config file
Time for Action – running the Build script
Summary
Index
Index

Format class

The Format class is used to serialize and deserialize feature data. There are just two properties, a few methods, and a list of valid subclasses we should quickly cover.

Format class properties

You'll often run into a situation where you have a data file that is in a different projection than your map. For instance, if you are using a spherical Mercator projection for your map and the data is in EPSG:4326, you'll need to set the following two properties so that OpenLayers can transform the projection.

  • externalProjection: {OpenLayers.Projection} This specifies the projection that the data is in.

  • internalProject: {OpenLayers.Projection} This specifies the projection that the map (or the geometries that will be returned) is in.

    Note

    By default, you can only use the spherical Mercator and EPSG:4326 projections. If you wish to use a different projection, you will need to include the Proj4js library, which was covered in more detail in Chapter 4.

Format class methods

There are two primary...

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