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Note how the loop across the game objects runs backward; this is because we can remove rock objects from the collection when they are destroyed This leads to a reduction in the collection size, which means that accessing the elements at the end would result in an out of bounds index Looping backward ensures that the rocks we remove will always affect the indexes of only the objects that we have already processed, removing the need to worry about this situation The BulletObject class now contains all the code it needs to be initialized, to move, to collide with rocks, and to expire when it has traveled a set distance All that is left is the code to create the bullet in response to the player tapping the screen This is handled in the SpaceshipObjectFireBullet function, shown in Listing 4 38.

All of MySQL s storage engines use one or more files to handle operations within data sets structured under the storage engine s architecture. The data_dir directory contains one subdirectory for each schema housed on the server. The MyISAM storage engine creates a separate file for each table s row data, index data, and metadata: table_name.frm contains the meta information about the MyISAM table definition. table_name.MYD contains the table row data. table_name.MYI contains the index data. Because MyISAM tables are organized in this way, it is possible to move a MyISAM table from one server to another simply by moving these three files (this is not the case with InnoDB tables). When the MySQL server starts, and a MyISAM table is first accessed, the server reads the table_name.frm data into memory as a hash entry in the table cache (see 4 for more information about the table cache for MyISAM tables).

private void toggleSound() // this is CORRECT { if (toggleCounter < TOGGLE_MAX) toggleCounter++; if ((glove.isClenched()||glove.isAPressed()) && (toggleCounter == TOGGLE_MAX)) { toggleCounter = 0; // reset if (soundPlaying) // play --> paused soundMan.pause(soundNm); else // paused --> resumed soundMan.play(soundNm); soundPlaying = !soundPlaying; } } // end of toggleSound() -- CORRECT The music is toggled on/off if the glove is clenched or button A is pressed, but only if toggleCounter has reached TOGGLE_MAX. This imposes an interval between state changes equal to TOGGLE_MAX*DELAY, which is about 1 second (14 75 ms).

It tries to retrieve a bullet object using the GetBulletObject function (which we will examine in a moment); if one is obtained, it calls its InitializeBullet function as already detailed in Listing 4 36 Listing 4 38 Firing a bullet from the player s ship private void FireBullet() { BulletObject bulletObj; // Try to obtain a bullet object to shoot bulletObj = GetBulletObject(); // Did we find one if (bulletObj == null) { // No, so we can't shoot at the moment return; } // Initialize the bullet with our own position and angle bulletObjInitializeBullet(Position, Angle); } GetBulletObject uses exactly the same approach that we saw for obtaining ParticleObject instances in the previous chapter: it looks for an existing bullet object whose IsActive value is false If one is found, it is returned If no such object is found, it creates a new object.

Note Files are not the same as file descriptors. A file is a collection of data records and data pages into a logical unit. A file descriptor is an integer that corresponds to a file or device opened by a specific process. The file descriptor contains a mode, which informs the system whether the process opened the file in an attempt to read or write to the file, and where the first offset (base address) of the underlying file can be found. This offset does not need to be the zero-position address. If the file descriptor s mode was append, this offset may be the address at the end of the file where data may first be written.

However, to make the game a little more challenging, we allow the player to have only four bullets active at any time If these bullets are already present, GetBulletObject returns null to prevent any further bullets from being fired The code for this function is shown in Listing 4 39 Listing 4 39 Finding or creating a bullet object for the player to fire private BulletObject GetBulletObject() { int objectCount; int bulletCount = 0; GameObjectBase gameObj; BulletObject bulletObj = null; // Look for an inactive bullet objectCount = _gameGameObjectsCount; for (int i = 0; i < objectCount; i++) { // Get a reference to the object at this position gameObj = _gameGameObjects[i]; // Is this object a bullet.

WrapHandView3D adds a cow to the scene with the help of ModelLoader from 7. JOALSoundMan positions a sound at the same spot and starts it playing: // in WrapHandView3D // globals private static final String COW_SND = "spacemusic"; private BranchGroup sceneBG;