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//Use the new value of _currentLevel to load the new level maps _currentPlatformMap = _platformMaps[_currentLevel]; _currentObjectMap = _gameObjectMaps[_currentLevel]; //Build the maps using the usual buildMap method buildMap(_currentPlatformMap); buildMap(_currentObjectMap); } This code also sets the value of _currentLevel back to 0 if the number of game maps is exceeded. This is what loops the levels infinitely. These few lines of code are all you need to extend a 1-level game to a 100-level or even 1000level game. Can you see now how much easier it is to create new levels in a tile-based game engine than it is in a game like Escape!, where most of the level specifics were hardwired into the game engine I ve kept this example simple so that you can clearly see the mechanics of switching and building new game levels. When you build your own game using this technique, you ll need to carefully consider the rules of the game, and make sure that they will apply no matter which level is loaded. Depending on your game, these rules could become quite complex. You may also find that it s useful to store specific level rules in an array of objects, and load those into the game when you load the new levels. In the race car examples later in this chapter, I ll show you one way you can store and load level rules in arrays along with your maps. In 10, you ll learn how to load levels and other game data from external XML files.

Scrolling a big environment is greatly simplified if you re using a blit display system in a tile-based game world. Because all the game objects are being projected onto single bitmaps, we can use the Bitmap class s ultra-fast scrollRect property. It s an optimized property designed exclusively for scrolling bitmaps, and it s perfect for scrolling game environments. You ll find an example of a big, scrolling tile-based game environment using scrollRect in the Scrolling folder. The cat now has a huge playground to jump around in, and the game world camera follows it all the way. Figure 8-31 shows this version. The tile-based game engine is essentially unchanged. We can drop the scrolling system directly onto the existing engine. The only small modifications we need to make are to account for the larger game world.

To use the ObjectBuilder class to create an object, you should create a builder factory class. This builder class will be responsible for creating the context, determining the strategies to use, and defining the policies. To handle the context of constructing objects, ObjectBuilder provides a simple implementation of IBuilderContext called BuilderContext. The BuilderContext class provides the context in which all of the operations for building up and tearing down objects operate. This class will contain all the meat and potatoes necessary to manage the policies and lifetime of the objects that are created. This also gives you the flexibility of creating your implementation for defining policies and managing objects through their life cycles. Listing 4-22 shows an implementation of the BuilderContext class called MyContext and a factory called MyFactory, which sets the strategies and policies to create objects like the one in Listing 4-21. Listing 4-22. MyContext and MyFactory Classes for Creating New Objects using using using using System; System.Collections.Generic; System.Text; Microsoft.Practices.ObjectBuilder;

E B V N In the early days of the Web, there were applications called price comparison services. Price

Figure 8-31. The scrolling game world The map arrays are twice the size: 20 columns by 16 rows. private var _platformMap:Array = [ [10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10], [10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10], [10,10,10,10,10,10,10,10,10,10,10,10,10,00,10,10,10,10,10,00], [10,10,10,10,10,01,01,10,00,00,10,00,00,00,10,10,10,10,00,00], [10,10,10,10,10,10,10,10,00,10,10,10,10,00,10,10,10,00,00,00], [10,10,10,10,10,01,01,10,00,00,00,10,10,00,10,10,10,10,10,10], [10,10,10,10,10,10,10,10,00,00,00,10,10,00,00,00,10,10,10,10], [10,00,10,10,00,00,00,10,00,00,00,10,10,00,10,10,10,00,00,10], [10,10,10,10,10,10,10,10,00,10,10,10,00,00,10,10,10,10,10,10], [10,10,10,00,00,10,10,00,00,10,10,00,00,00,00,00,00,10,10,10], [10,10,10,10,10,10,10,00,10,10,00,00,00,00,10,10,10,10,10,10], [10,10,10,10,10,00,00,00,10,10,00,00,00,00,10,10,10,00,00,10], [10,10,10,10,10,10,00,00,10,10,10,10,00,10,10,10,10,10,10,10], [10,10,10,10,00,00,00,10,10,10,10,10,00,10,10,00,00,00,10,10], [10,00,00,10,10,10,00,10,10,10,10,10,10,10,10,10,10,10,10,10], [00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00] ]; The _gameObjectMap is equally large. However, it doesn t matter how large these maps are; they can be any size. The BitmapData that contains them will automatically expand to fit the size of the array. This is because it finds the correct size by multiplying the number of rows and columns by the tile size.

namespace ObjectBuilderExample { public class MyFactory<T> where T : class {

private var _backgroundBitmapData:BitmapData = new BitmapData ( MAP_COLUMNS * MAX_TILE_SIZE, MAP_ROWS * MAX_TILE_SIZE, true, 0 ); private var _backgroundBitmap:Bitmap = new Bitmap(_backgroundBitmapData); private var _foregroundBitmapData:BitmapData = new BitmapData ( MAP_COLUMNS * MAX_TILE_SIZE, MAP_ROWS * MAX_TILE_SIZE, true, 0 ); private var _foregroundBitmap:Bitmap = new Bitmap(_foregroundBitmapData); You can design the game maps in the same ways as you design smaller maps. The same rules apply. However, if you use maps of different sizes, you ll need to make sure that the bitmaps are sized correctly. In 10, you ll learn how you can store this information in XML as metadata that you can load with the map.