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It s also possible to use tiles that are larger than the maximum tile size. You ll need to make a second tile sheet for big objects, and modify the tile game engine a bit to handle them. By the end of this chapter, you ll understand the concepts of tile-based games well enough that this shouldn t pose too big a challenge.

For those websites that read data as often as it is written, the static HTTP validation approach would be wrong because updating the file takes too many resources. In the case of dynamic HTTP validation, the server application framework has to manage everything, which includes the generation and verification of the entity tag. The major problem to solve is the generation of the entity tag (ETag) identifier. Traditionally, web developers do not write an ETag identifier. But what is an entity tag for dynamic content Calculating the entity tag for the generated content does not make sense because there could be small changes in the generated content that do not quantify as changed content. There is a solution, and one that functions like an entity tag but is not called that. The proposed solution uses a hash code that is assigned as an entity tag value. A hash code is a reasonably unique value for a given state of an object. In .NET and Java, each object has a hash code method that can be overridden. Imagine the following Book class that represents a book. Ignore the details of the book definition, but understand that the book represents some type. To calculate the hash code for the book, you could write the following source code:

The Character application class is identical to the first example except for these modifications. Our next step is to make the cat run and jump around the stage.

Caution The Microsoft Guidance Automation Extensions have a 260-character limitation on the total length of a file path. A workaround is to use a shorter folder structure such as C:\Guided Solutions\ as opposed to the default Visual Studio 2005\Projects directory.

Run the SWF in the MovingCharacter folder. You can use the mouse to make the cat run and jump, as shown in Figure 8-9. It can t jump on the platforms yet, but it does stop at the stage boundaries, like the bottom of the stage.

A series of projects will be created for you, as shown in Figure 3-4.

public class Book { private String _ISBN; private String _author; private String _title; private int _staticHashCode; private boolean _isHashCodeAssigned = false; public int hashCode() { if( _isHashCodeAssigned) { return _staticHashCode; } else { return new HashCodeBuilder() append( _ISBN) append( _author) append( _title) append( _comments)toHashCode(); } } public void assignHashCode(int hashcode) { _staticHashCode = hashCode(); _isHashCodeAssigned = true; } public void resetAssignedHashCode() { _isHashCodeAssigned = false; } } In the implementation of Book, there are several methods and data members The data member _staticHashCode represents an old hash code value The old hash code value is needed to verify whether content has changed Consider the following context The client makes a request for a resource The server instantiates the needed objects and from those objects generates a hash code that is stored in the object state itself (staticHashCode).

Figure 8-9. Use the mouse to make the cat jump. Because the TileModel class extends the AVerletModel class, we can use the same physics system we ve been using in all the other chapters in this book. And because our data is completely separate from the display, the physics code in a tile-based blit environment is identical to the physics code for sprites or movie clips. All we need to do is create a UIView and UIController to create the platform game control. UIPlatformView and UIPlatformController handle the cat s jump physics. You ll find these classes in the com.friendsofed.gameElements.primitives package. The UIPlatformView captures the mouse input and sends it to the UIPlatformController to process. Both of these classes are instantiated in the buildMap method at the same time as the cat s TileModel class.

Also added to the solution is a set of recipes and templates that can be used for creating the components of the ACME POS Service solution. You can find these recipes and templates in the Guidance Package Manager, available from the Tools menu, as shown in Figure 3-5.