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Figure 8-24. The hedgehog changes direction if it detects that the tile below it is sky. You can find the cell in the row below the hedgehog like this: _platformMap[_hedgehogModel.centerY + 1][_hedgehogModel.centerX] This will tell you what kind of tile is in the cell directly below the center of the hedgehog. The + 1 means one greater than the current row. So, if the hedgehog is currently on row 6, adding +1 will refer to row 7. The preceding line of code uses the hedgehog s center point to find the cell below it. If we used this line of code in the game, it would work, but the hedgehog would move halfway over the edge of the platform before it noticed that the bottom tile had changed to SKY. In this example, we want the hedgehog to change direction as soon as its extreme left and right edges sense that the lower tile has changed. To do this, we can use the TileModel s left and right properties. Here s how to find the tile at the bottom left: _platformMap[_hedgehogModel.centerY + 1][_hedgehogModel.left] And here s how to find the tile at the bottom right: _platformMap[_hedgehogModel.centerY + 1][_hedgehogModel.right] All you need to do is use these in an if statement and check whether they equal the value of SKY. If they do, reverse the hedgehog s vx. if (

Note that the classes have not been fully implemented from a persistence point of view because doing so would detract from the discussion of the pattern implementations: public class LibrarianSaveToFile implements Librarian { private static String _rootPath; private Librarian _next; public LibrarianSaveToFile(Librarian next) throws InstantiationException { if( _next == null) { throw new InstantiationException("Next element cannot be null"); } _next = next; } public static void setRootPath(String path) { _rootPath = path; }.

interface within a class. When the InstrumentationStrategy sees the IInstrumentationEventProvider interface, it will call the GetInstrumentationEventProvider method to return the object responsible for being the InstrumentationProvider. Listing 4-15. Use of the IInstrumentationEventProvider Interface using using using using System; System.Collections.Generic; System.Text; Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation;

_platformMap [_hedgehogModel.centerY + 1] [_hedgehogModel.left] == SKY || _platformMap [_hedgehogModel.centerY + 1] [_hedgehogModel.right] == SKY ) { _hedgehogModel.vx = -_hedgehogModel.vx; } The hedgehog s entire AI is this one simple if statement. And because it s based on a very general rule, it will work no matter how long the platform is or where on the map the hedgehog is placed. This means you can make maps with platforms and hedgehogs, place them anywhere, and they will work as expected, without changing a single line of code. It s a feature of the game engine. The elevator follows the same logic, but needs to check for more conditions, as shown in Figure 8-25.

If you can conceptualize this problem logically, it s a small step to turn it into working code. Here s the code from the Enemies application class that does this: //If the elevator is going down... if(_elevatorModel.vy > 0) { if ( _platformMap [_elevatorModel.bottom] [_elevatorModel.centerX - 1] == SKY && _platformMap [_elevatorModel.top] [_elevatorModel.centerX - 1] == PLATFORM ) { _elevatorModel.vy = -_elevatorModel.vy; } } //If the elevator is going up... else { if ( _platformMap [_elevatorModel.top] [_elevatorModel.centerX - 1] == SKY && _platformMap [_elevatorModel.bottom] [_elevatorModel.centerX - 1] == SOFT_PLATFORM ) { _elevatorModel.vy = -_elevatorModel.vy; } } Complex conditional checks like this are possible because we can check the object s top and bottom corners simultaneously. This is a simple example, but using the same technique could result in sophisticated AI if you program your objects to react to changing game and environmental conditions.

public Book checkOutBook(String isbn) throws Exception { // Ignore nothing to do and continue to next element return _nextcheckOutBook( isbn); } public void checkInBook(Book book) throws Exception{ String path = _rootPath + "/books/" + bookgetISBN() + "xml"; // Save the data to a file .. _nextcheckInBook(book); } } public class LibrarianSaveToStorage implements Librarian { public LibrarianSaveToStorage() { } public Book checkOutBook(String isbn) throws Exception { // Retrieve from the storage mechanism return null; } public void checkInBook(Book book) throws Exception { // Save to the storage mechanism } } The class LibrarianSaveToFile implements the Librarian interface and is responsible for saving changed content to the file retrieved by using the URL /ajax/books/[ISBN]xml The class LibrarianSaveToStorage also implements the Librarian interface and is responsible for retrieving and saving the Book data to a relational database.

namespace Sample.SimpleInstrumentationSample { public class MyComponent : IInstrumentationEventProvider { private SomeProvider myProvider = new SomeProvider(); public object GetInstrumentationEventProvider() { return myProvider; } } }

In this next example, I ll show you how to vanquish an enemy in the time-honored tradition of jumping on its head. Run the SquashEnemy SWF, and you ll see that you can now make the hedgehog disappear by jumping on it. The collision will also cause the cat to bounce. Figure 8-26 shows the action.