ActionScript 3.0 Design Patterns.pdf - VideoTutorials-bg.com

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• Indicate that a remote player has made a move (onProxyMove). Records the move of the remote player, and prevents a further move by the remote player until the next turn. • Send the local player move to the remote player (doMove). The move will be picked up by the opponent’s onProxyMove method. • Conclude the turn after both players have moved (takeTurn). Once both players have moved, the moves are turned over to the Referee to determine who’s won and reset the values for the next turn. • Prevents play until both players are connected (numConnect). This method has the dual function of letting players know of each other’s presence, and prevents a move if only one player’s present. By first working out the basics of a move and a turn, we’ve laid the basis for turnbased games. The next step is putting the moves into a game context. The Referee In order to keep everything fair and fun, we need a referee. The class diagram for the referee in relationship to the player can be seen in Figure 13-1: Referee Figure 13-1. Referee and Player class diagram Player Interface Player Essentially, the referee will be a class containing the rules of the game encased in a template method. As a design pattern, the methods need to be fairly general, in case we want to reuse the same Referee class for another game. Using a template method, we can order the operations in the methods to launch in sequence, but we want flexibility for other games. So, we begin with a list of operations for the referee that applies to all games: • Evaluate the moves and determine who won. All games need a set of winning conditions and the ability to determine which player won, which lost or whether they tied. • Display the results of the game. Once the results have been calculated, they must be communicated to all players. Simultaneous Game Moves and Outcomes | 471
• Reset the game variables to the beginning conditions. Because the players have been keeping track of who has moved, which moves were selected, and which player was declared the winner, all the variables keeping track of these different states have to be cleared. Each operation will be cast as a method and then arranged into an order that constitutes the template method. Following the Hollywood Principle (see Chapter 9), the Referee instance will make calls on the Player objects. Now that we have a referee, we need to look at the relationship between the players and the referee. Figure 13-2 is an object diagram for a two-player game with a referee: Figure 13-2. Referee and players Just like a non-virtual game, the single referee makes decisions about the game outcome for two or more players. At this point, the game is immaterial—it could be any game. Looking at the object diagram, it’s not difficult to imagine two or more players interacting on a single host (computer). In fact, if the goal were to create a game where one of the players is the computer and the other’s a user interacting through a UI, our job would be done. In a game of Rock, Paper, Scissors, a random move generator could easily be one of the two players. However, because we want to play the game over the Internet, we have a few more steps. The Internet, Proxies, and Players As soon as we introduce remote players over the Internet, everything changes. Each player makes a move, that move is sent over the Internet, and the referee decides the outcome, displays it, and then cleans everything up. With serial turn taking, the problem may not be as daunting because after each move, both players can see the other’s move. The referee can wait until the first win condition is met and then send messages to all players. However, this can get messy because you have to decide where the referee’s going to reside. The referee could be placed on the host with the first player to start. The second player would be referenced through a proxy. Another solution would be to place the referee on its own server, and, while workable, this requires that the moves travel over the Internet twice. Also, depending on the server, the basic game design may have to be changed to accommodate what the referee looks like. 472 | Chapter 13: Symmetric Proxy Pattern Referee Player 1 Player 2
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ActionScript 3.0 Design Patterns
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ActionScript 3.0 Design Patterns Wi
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Bill would like to dedicate this to
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Example: Sprite Factory 84 Example:
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Video Player Concrete State Applica
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Who This Book Is For We wanted to d
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What You Need to Use This Book You
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and OOP. (Working out how to conver
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Safari® Enabled When you see a Saf
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Editors Our development editor, Rob
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Design patterns provide object-orie
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that program. Like pulling a string
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Built-in State Machines: while most
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Figure 1-2. Rocket drawing Center p
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Example 1-1. TestRocket.as package
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skills that would provide the concr
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Example 1-3. PlayVideoAbstract.as (
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Hiding Your Data from Bad Consequen
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Example 1-7. Encap.as (continued) }
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Wait! There’s more! Later in this
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As you can see in Example 1-9, the
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Using Encapsulation and Design Patt
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Example 1-13. QuadPets.as (continue
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Using Interfaces and Abstract Class
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interface. You’ll need an MP3 fil
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Example 1-22. Subclass.as package {
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Example 1-25. ImplementSubChange.as
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Example 1-29. Country.as (continued
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Example 1-32. IBiz.as package { pub
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Example 1-35 has further difference
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In addition to messages in the Outp
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state here is a bit more contextual
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your client dependency leads to une
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Example 1-40. VidPlayer.as (continu
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Doing Composition To understand com
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The clearest way we’ve seen compo
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Example 1-47. Mp3.as (continued) }
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Example 1-54. TestMedia.as (continu
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and ActionScript 3.0. However, the
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Figure 1-10 shows some possible fut
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introduction to OOP, you will find
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Creational Patterns Conceal creatio
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or dependency between the Client an
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The primary responsibility of the f
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The example package contains the Pr
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Example 2-5. CreatorA.as (continued
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instantiate concrete products var p
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Example 2-8. IPrintjob.as package p
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Clients Note that the client doesn
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Extended Example: Color Printing Th
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Example 2-19. NewLowVolPrintCenter.
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Key OOP Concepts Used in the Factor
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to implement default behavior commo
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Example 2-26. ShapeCreator.as packa
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draw filled shapes filledShapeCreat
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checking if the projectile has gone
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Example 2-32. AlienMine.as (continu
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Example 2-34. AlienShip.as } } } }
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Example 2-36. Weapon.as (continued)
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Concrete Creator Classes Until we e
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in teamwork, the Singleton can be u
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To create a class, we need a public
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Example 3-4. Singleton.as package {
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Figure 3-3. Compiler not finding cl
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However, does that mean that only a
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Figure 3-5. Two instance labels and
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Example 3-10. Alert.as } } { Alert.
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However, had we done that, we would
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for playing the selected tune. If i
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MP3 file in the same folder, and re
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shipping costs. It constitutes a go
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open the Convert to Symbol dialog b
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PART III III.Structural Patterns Tr
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Chapter 4 CHAPTER 4 Decorator Patte
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like abstract classes, simply by no
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simple inheritance. Depending on ho
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Minimalist Abstract Decorator To ge
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eral months. Using a Decorator desi
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Example 4-5. DecConB.as package { /
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Applying a Simple Decorator Pattern
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If you want to create more concrete
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Example 4-15. Muff.as package { pub
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Figure 4-6. Paper doll with two dif
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Adding Properties and Methods Up to
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Decorating with Multiple Properties
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} override public function evil( ):
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Example 4-25. Compassion.as package
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Deadly sins Example 4-29. Rage.as p
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Example 4-33. Dogmatisms.as package
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class window in the Dual.fla Proper
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Example 4-37. Soul.as (continued) }
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Imagine that you are responsible fo
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Example 4-41. Accord.as (continued)
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Example 4-45. GPS.as package { publ
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Example 4-48. Deal.as 16 internal v
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Example 4-48. Deal.as 120 { 121 tra
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Figure 4-8. Decorator user interfac
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Chapter 5 CHAPTER 5 Adapter Pattern
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and their functionality to figure o
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Example 5-4. Main.as (continued) }
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Example 5-5. Adaptee.as package { p
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methods and properties to accomplis
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Example 5-9. LegacyCar.as 47 } 48 4
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ignition key of the car (assume tha
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Example 5-11. CarAdapter.as (contin
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Note that the new interface turns t
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var listField = new TextField( ); l
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Example 5-14. ListDisplayField.as 3
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Example 5-15. Main.as (document cla
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Example 5-17. Main.as (document cla
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Summary The adapter pattern allows
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objects and composite objects the s
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the components. We can think of tou
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method by tracing sName. When opera
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oot composite 1 leaf 1 leaf 2 compo
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Executing the following statements
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Example 6-6. The safeRemove( ) meth
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leaf 2 Composite 1 leaf 2 leaf 3 Di
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Example 6-9. Playlist.as (continued
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Example 6-10. Song.as 58 soundChann
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Using Inverse Kinematics Inverse ki
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Example 6-12. Composite.as package
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Example 6-14. Main.as 23 addChild(s
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The following steps relate to Figur
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Example 6-16. Tail.as package { imp
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Note how the snake is constructed u
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Example 6-18 shows the IPlane inter
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Unlike the Shape class, Sprite does
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Figure 6-9. Hierarchical tree struc
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Modifying Components to Reflect Dam
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private function showDamage(evt:Eve
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Behavioral Patterns Class Communica
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Notice the tight coupling between t
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Each envelope encapsulates a partic
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instance is passed to the construct
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Setting a Trigger to Invoke the Com
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Example 7-7. IMacroCommand.as packa
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Example 7-12. ConcreteMacroCommand.
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Example 7-14. TextButton.as package
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Example 7-15. InvokerPanel.as (cont
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Extended Example: Sharing Command O
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changes are seamlessly spread throu
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Example 7-21. IncrementCommandWithU
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Example 7-24. Client code for undoa
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Example 7-26. TextDisplayField.as (
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Example 7-28. Radio.as 44 var url =
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Example 7-30. Client code for the p
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Example 7-31. DynamicControlButtons
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adio, very much like someone progra
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Chapter CHAPTER 8 8 Observer Patter
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introduced, adding a class as part
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of an abstract class or an interfac
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works fine. What’s more, using th
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this all work right is the use of a
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Example 8-7. ConcreteSubject.as (co
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Example 8-9. TestSub.as (continued)
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} this.news=news; this.sports=sport
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Example 8-12. ConcreteSubject.as pa
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Example 8-13. ConcreteObserver.as (
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Whoaa!, the stock market is at 2987
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Example 8-17. ConcreteSubject.as pa
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Launching the Space Battle In Examp
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5. In the Symbol editing mode, drag
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Figure 8-5. Android shooting a beam
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Example 8-19. ChangeHandler.as (con
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To make the task more manageable an
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Example 8-24. ConcreteObserver.as p
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In this application, all you’re r
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Example 8-26. QuarterBar.as (contin
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Example 8-27. QuarterGraph.as (cont
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Example 8-28. DataDesign.as (contin
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Summary The real test for a design
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to inspect. So, you’re going to n
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method. The child classes just give
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Further, discussing favoring compos
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Figure 9-3. Hollywood principle Min
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tions in the main algorithm that yo
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Example 9-4. ShedMaker.as package {
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Both instances employ the templateM
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Not-So-Concrete Concrete Classes Th
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Example 9-11. PlayVideo.as (continu
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Example 9-13. PlayMedia .as (contin
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When to Hook? The hook’s useful w
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Example 9-15. FlightPlan.as (contin
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Open a new Flash document, and type
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One application where the state pat
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tive Simulation by Jonathan Kaye an
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For example, with a two-state machi
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Example 10-2. VideoWorks.as (contin
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To complete the state machine, we n
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Example 10-7. State.as package { //
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Example 10-10. VideoWorks.as (conti
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Example 10-13. TestVid.as package {
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Example 10-13. TestVid.as (continue
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Example 10-15. StopState.as (contin
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Example 10-17. PauseState.as 22 pub
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Example 10-19. TestPause.as (contin
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Figure 10-6 shows what your video p
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Figure 10-7. Statechart with five s
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Example 10-22. PlayState.as 1 packa
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Example 10-24. RecordState.as 1 pac
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Example 10-26. VideoWorks.as (conti
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Example 10-27. TestFMS.as (continue
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Chapter CHAPTER 11 11 Strategy Patt
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say that the Context class (aggrega
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etween the context classes and the
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Example 11-3. ConcreteStrategy.as p
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Adding More Concrete Strategies and
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Example 11-9. Tricks.as (continued)
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Even though we’ve discussed some
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Example 11-18. Bubbles.as package {
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Simply by adding setters to the con
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Contexts for String Strategies You
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Example 11-24. StringWork.as packag
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Page 446 and 447: Using More Than One Pattern PART V
Page 448 and 449: Chapter 12 CHAPTER 12 Model-View-Co
Page 450 and 451: triggered by a user interacting wit
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Page 454 and 455: Example 12-2. Model.as (continued)
Page 456 and 457: Example 12-5. View.as (continued) 1
Page 458 and 459: implementations in the MVC. Our vie
Page 460 and 461: Example 12-8. CompositeView.as (con
Page 462 and 463: Example 12-10. CharCodeLeafView.as
Page 464 and 465: Key OOP Concepts in the MVC Pattern
Page 466 and 467: Example 12-12. IModel.as (Model int
Page 468 and 469: Example 12-15. Controller.as (Contr
Page 470 and 471: Example 12-16. CBView.as 24 update(
Page 472 and 473: Note that only the combo boxview th
Page 474 and 475: Example 12-18. INewModel.as (contin
Page 476 and 477: Example 12-21. RBView.as package {
Page 478 and 479: add map type select radio button gr
Page 480 and 481: Example 12-23. CarModel.as (continu
Page 482 and 483: Example 12-25. RHController.as (con
Page 484 and 485: Example 12-28. Main.as (document cl
Page 486 and 487: Example 12-30. GPSView.as package {
Page 488 and 489: Example 12-32. ChaseController.as (
Page 490 and 491: Chapter 13 CHAPTER 13 Symmetric Pro
Page 494 and 495: Even though both of the solutions a
Page 496 and 497: Referee 1 Player1 Proxy2 Internet S
Page 498 and 499: With a single template method, and
Page 500 and 501: developed with an eye to the order
Page 502 and 503: Boolean variables to false. (The fa
Page 504 and 505: Example 13-3. RPS.as (continued) }
Page 506 and 507: Example 13-4. proxygame.asc (contin
Page 508 and 509: Example 13-5. SymPlayer1.as package
Page 510 and 511: Example 13-5. SymPlayer1.as (contin
Page 512 and 513: Example 13-5. SymPlayer1.as (contin
Page 514 and 515: In addition to using the Referee to
Page 516 and 517: Example 13-6. DynamicText.as (conti
Page 518 and 519: 3. Click the Text layer to select i
Page 520 and 521: A abstract classes, 28, 31, 68, 130
Page 522 and 523: increment and decrement commands, 2
Page 524 and 525: E ECOOP, 470 EmailCheck.as, 418 enc
Page 526 and 527: MapTypeController.as, 454 MapView.a
Page 528 and 529: Q QuadPets.as, 25 R Radio.as, 273 R
Page 530: T Tail.as, 231 Target.as, 180 Templ
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