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

Time for Action – using rules and filters

Let's use rules and filters to assign different styles to feature objects based on their attributes.

  1. Let's jump in to using rules and filters. Add a WMS layer to the map. We'll also need a vector layer, so add in a vector layer:

            vector_layer = new OpenLayers.Layer.Vector('Basic Vector Layer'); 
        map.addLayer(vector_layer);

  2. Next, we'll need some features. We'll generate some random feature points again, and we'll create a property for each object called population which contains a random number between 0 and 2000:

    for(var i=0; i<20; i++){
  vector_layer.addFeatures([new OpenLayers.Feature.Vector(
    new OpenLayers.Geometry.Point(
     (Math.floor(Math.random() * 360) - 180),
      (Math.floor(Math.random() * 180) - 90)
    ),
    {
      'population': Math.floor(Math.random() * 2000)
    }
  )]);
}

  3. Now we need to create a style object—rules are applied directly to style objects, and filters are applied directly to rules. So, let's create...

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