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There are three basic bitmap collision-detection strategies that will serve you well for all types of games: Convex shapes: When your shapes are roundish or squarish with a solid center, like the star shapes in the previous example. Surfaces: When the collision is from only one side, like a wall at the side of the stage or the ground at the bottom of the stage. Concave shapes: When the shapes have a hollow center, like a cave. Over the next pages, we ll tour all these strategies in real-live game contexts.

Weighing Up the StatusQuo . ..............................................................................................................405 HTML Web Technologies . ................................................................................................................406 Virtual Machines in the Browsers ......................................................................................................410 Frameworks behind the scenes ........................................................................................................411 Migration Strategies. ............................................................................................................................412 Generating XML ................................................................................................................................412 Service-Orienting Legacy Applications .............................................................................................414 Resolving State Management Complexity. .......................................................................................418 Optimizing the Frequency of Round-trips . ........................................................................................419 Generating Database-driven Applications . .......................................................................................419 Reusing the Middle Tier . ...................................................................................................................426 Strategies to Port Framework-based Applications. .........................................................................427 Apache Struts 1.x and Flex. ..............................................................................................................427 Ruby on Rails and Flex. ....................................................................................................................429 Summary . .............................................................................................................................................432

After presenting four different application scenarios for remoting in the previous sections, I d also like to point out some environments in which I wouldn t use remoting at all.

13: Working with Web 2.0 APIs . ................................................................ 433

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In the chapter s source files, find the Asteroid folder and run the SWF. You ll see a small Lunar Lander-style spacecraft that you can fly around the stage with the arrow keys. The lander, as its name implies, can land anywhere on the asteroid. I ve made the vector between the lander and asteroid visible so that you can more easily understand the relationship between them.

Designed by the Object Management Group (OMG), an international consortium of about 800 companies, CORBA s aim is to be the middleware of choice for heterogeneous systems. OMG s CORBA, which stands for Common Object Request Broker Architecture, is only a collection of standards; the implementation of object request brokers (ORBs) is done by various third parties. Because parts of the standard are optional and the vendors of ORBs are allowed to include additional features that are not in the specifications, the world has ended up with some incompatible request brokers. As a result, an application developed to make use of one vendor s features could not easily be ported to another ORB. When you buy a CORBA-based program or component, you just can t be sure if it will integrate with your CORBA applications, which probably were developed for a different request broker. Aside from this potential problem, CORBA also has quite a steep learning curve. The standard reads like a complete wish list of everything that s possible with remoted components sometimes it simply is too much for the standard business. You ll probably end up reading documents for days or weeks before your first request is ever sent to a server object. Nevertheless, when you have managed to implement your first CORBA application, you ll be able to integrate a lot of programming languages and platforms. There are even layers for COM or EJB integration, and apart from SOAP, CORBA is the only true multiplatform, multiprogramming language environment for distributed applications.

Twitter API for Flex and AIR Apps......................................................................................................433 Twitter API Using an AIR Application................................................................................................434 Twitter API Using Flex Application ....................................................................................................435 Integrating with Salesforce . ..............................................................................................................438 Using Amazon S3 for File Sharing ....................................................................................................447 Hacking YouTube. .............................................................................................................................454 Summary . .............................................................................................................................................460

In all the examples in this chapter and the next, I haven t used any filters on the display objects. I ve omitted them so that the bitmap edges are more clearly defined. This makes testing and debugging easier because you can clearly see how accurate the collision is. Feel free to add filters like drop shadows and bevel effects on bitmaps in your own games if they don t negatively affect performance.

Distributed Component Object Model (DCOM) is an extension that fits in the Component Object Model (COM) architecture, which is a binary interoperability standard that allows for component-oriented application development. You ll usually come in contact with COM when using ActiveX controls or ActiveX DLLs. DCOM allows the distribution of those components among different computers. Scalability, manageability, and its use in WANs pose several issues that need to be addressed. DCOM uses

14: Facilitating Audio and Video. .............................................................. 461

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