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To completely understand how Enterprise Library uses these new .NET Framework configuration features, it is important to understand the features themselves. Listings 4-1 through 4-4 demonstrate how to define a custom configuration section within an XML file (whether it is the application configuration or a stand-alone file), how to implement the code to serialize and deserialize XML data into inherited instances of the ConfigurationSection class, and how to utilize that custom configuration data within a simple console application. Listing 4-1 shows what a custom configuration section might look like within a configuration file. Listing 4-1. Sample Configuration File: myCustom.config < xml version="1.0" encoding="utf-8" > <configuration> <configSections> <section name="myCustomSection" type="Samples.MyCustomSection, Samples, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" allowDefinition="Everywhere" allowExeDefinition="MachineToApplication" restartOnExternalChanges="true" /> </configSections> <myCustomSection myFirstSetting="1" mySecondSetting="A" /> </configuration> With the configuration file created, the next step is to be able to deserialize this information into something useful within an application. Listing 4-2 demonstrates how to inherit from the ConfigurationSection class to utilize the custom configuration section in Listing 4-1 using the programmatic model. Listing 4-2. Inherited ConfigurationSection Class Using the Programmatic Model using System.Configuration; public sealed class MyCustomSection : ConfigurationSection { // The collection (property bag) that contains the section properties. private static ConfigurationPropertyCollection m_Properties; // The myFirstSetting property. private static readonly ConfigurationProperty m_MyFirstSetting = new ConfigurationProperty("myFirstSetting", typeof(long), (long) 1, ConfigurationPropertyOptions.IsRequired); // The mySecondSetting property. private static readonly ConfigurationProperty m_MySecondSetting = new ConfigurationProperty("mySecondSetting", typeof(string), "A", ConfigurationPropertyOptions.IsRequired); // CustomSection constructor.

Efficient collision detection is one of the big strengths of a tile-based game engine. An inefficiency with all the collision-detection strategies in the book so far is that they check for collisions with objects that have no chance of ever colliding. For example, a ball at the top-left corner of the stage has no hope of ever colliding with a ball in the bottom-right corner of the stage in the current frame, or even in the next frame. This may not have any noticeable performance impact

public MyCustomSection() { // Property initialization m_Properties = new ConfigurationPropertyCollection(); m_Properties.Add(m_MyFirstSetting); m_Properties.Add(m_MySecondSetting); }

<%@ Page Language="C#" %> <script runat="server"> class DynamicURL { public static string GetAsync() { return "/url"; } } </script> <html> <head> <title>Hard Code Reference</title> <script language="JavaScript" src="../lib/factory.js"></script> <script language="JavaScript" src="../lib/asynchronous.js"></script> <script language="JavaScript" type="text/javascript"> var asynchronous = new Asynchronous(); </script> </head> <body> <button onclick="asynchronous.call('<%=DynamicURL.GetAsync() %>')"> Get Image EBVN </button> <table> <tr><td id="counter"></td></tr> </table> </body> </html> In this modified example of the HTML code, there is code that is executed on the server side, and code that is executed on the client side. For those who code in PHP, JSP, or other similar technologies, you will know that what is executed on the server side is surrounded by escape tags. For ASP.NET, the escape tags usually are the <% and %> characters. Another way to run server-side code using ASP.NET is to use the script tag, where the runat attribute has a value of server. What is of interest is the text DynamicURL.GetAsync, which is a method call issued on the server to generate a URL. In the implementation of the GetAsync method, a hard-coded /url is returned, but the implementation really represents a piece of dynamically generated code. Generating the URL dynamically is not a real advantage because that is the purpose of the Permutations pattern. Where generating the URL does make sense is if the Content Chunking and Decoupled Navigation patterns are used. In those cases, there are scenarios where functionality is referenced that is orthogonal to the functionality of the HTML page contained in the URL. The orthogonal URL might be a dependency of some web application plug-in, and hence generating the URL gives some extra flexibility. In the case of the server push, the dynamically generated URL can be used to identify the specific URL.

on a small game, but it s nonetheless an irksome and wasteful inefficiency. For a complex game with hundreds of moving objects, it could be a deal-breaker. In 4, I explained the difference between broad-phase and narrow-phase collision detection. Here s a quick refresher. Broad-phase: Checking for objects that are in the immediate vicinity of one another. It tells you which objects are most likely to collide. Narrow-phase: Checking for actual collisions between those objects. This is most commonly a distance-based check. All the collision detection that we ve done in the book so far has been narrow-phase. With a tilebased game engine, we have a fantastically efficient system for implementing broad-phase collision detection. Specifically, it s a type of broad-phase collision detection called a spatial grid (also referred to as a uniform grid). You ll find an example of spatial-grid broad-phase collision detection in the PlatformCollision folder. Now the cat can jump from platform to platform, as shown in Figure 8-11.

Figure 8-11. Accurate tile-based platform collision detection The collision detection is clean and accurate, but the cat is only checking for collisions with platforms within its immediate vicinity. Let s take a close look at how this works