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The player s spaceship is obviously a very important part of the game, but at this stage it is lacking some important functions: we haven t looked at how the user can interact with the device yet (this is coming up in the next chapter), so there is no way for us to control the ship. Instead it is a bit of a sitting duck, motionless in the middle of the screen watching nervously as the huge lumps of rock hurtle past it. We still have some interesting functionality to add, however. Even though the ship cannot move, it can still react to a collision with any rock that might happen to crash into it. This means we have to be able to determine whether a rock is touching the ship and, if one is, to explode in a fiery ball of destruction. Let s deal with the collision detection first. This process is handled in the HasCollided function, which returns a reference to any object that has collided with the ship, or null if no collision was detected. The only thing we need to worry about colliding with is a rock, so the code loops through all the game objects looking for objects that are of type RockObject. For each one found, the game performs some further checks to detect collisions. The quickest but least accurate check is to see whether the bounding boxes of the ship and the rock intersect. If they do, there might possibly (but not necessarily) be a collision; if they do not, then the ship and the rock have definitely not collided. Figure 3 12 demonstrates some scenarios that this test might encounter. (a) (b) (c)

I m not using OpenAL directly, but rather the Java wrapper, JOAL. All the necessary JOAL software can be found at https://joal.dev.java.net/, so there s no need to download the OpenAL libraries. I ll explain the installation details in the next section. The DevMaster.net OpenAL tutorials have been translated into JOGL (at https:// joal-demos.dev.java.net/) except for one on Ogg Vorbis streaming. Starfire Research also has some brief but good JOAL examples, starting at http://www.starfireresearch.com/services/ java/docs/joal.html.

The Berkeley DB storage engine handler implementation files Program compilation files The mysql command tool (client program) implementation files The mysql database (system database) schema, data, and index files Debugging utility code The documentation, both internal developer documents and the MySQL online manual The MEMORY storage engine handler implementation files Core system header files and type definitions The InnoDB storage engine handler implementation files The old ISAM storage engine handler implementation files The MySQL C client API (all C source and header files) The MySQL server core library (C, C++, and some header files) A simple program to test MySQL The old Merge storage engine handler implementation files The MyISAM storage engine handler implementation files The MyISAM Merge storage engine handler implementation files The core function library, with basic low-level functions The regular expression function library Shell scripts for common utilities Internationalized error messages The meat of the server s implementation, with core classes and implementations for all major server and client activity MySQL benchmarking shell scripts Lower-level string-handling functions Preconfigured MySQL configuration files (such as my-huge.cnf) Test programs and scripts Network/socket utility functions, virtual I/O, SSL, and so on Compression function source files

Figure 3 12. Collision scenarios for the bounding box intersection check Figure 3 12(a) shows a scenario in which the bounding box can quickly and easily determine that the ship and rock have not collided. Their bounding boxes do not intersect, so it is impossible for the two to be touching each other. Figure 3 12(b) and Figure 3 12(c) both pass the intersection check, although in 3 12 (b) they are clearly not actually touching. If the bounding boxes do intersect, we need to perform an additional check to gain some additional accuracy. This more accurate check is a little more computationally

The main JOAL forum is at http://www.javagaming.org/forums/index.php board=26.0. There s also a JOAL list at the lwjgl.org site, http://lwjgl.org/forum/index.php board=10.0. The focus is on the Lightweight Java Game Library (LWJGL), but there s plenty of general information as well. If these forums don t answer your questions, you should consider searching through the OpenAL lists that I mentioned.

You can take some time now to dig through the source code a bit, for fun, but you will most likely find yourself quickly lost in the maze of classes, structs, and C functions that compose the source distribution. The first place you will want to go is the documentation for the distribution, located in the /Docs directory. Then follow along with us as we discuss the key subsystems and where you can discover the core files that correspond to the different system functionality.