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The Odejava API can be obtained at https://odejava.dev.java.net/. The Odejava snapshot is available in the 2006-01-15_cvs (1) folder, accessed via the web site s Documents & Files menu item. The snapshot is a zipped file containing Odejava s platform-independent JARs (and a lot more stuff as well). Extract odejava.jar from the odejava\odejava subdirectory, and log4j-1.2.9.jar from odejava\odejava\lib. You may also want the vecmath.jar file, but Java 3D already contains that JAR, so I didn t need it. The platform-dependent elements are a separate download from the same web site. Grab the Windows Binaries ZIP file from the 004-10-30 natives (4) folder and extract the odejava.dll file from its windows\release subdirectory. At this point, you should have three files: odejava.dll, odejava.jar, and log4j-1.2.9.jar. The two JARs should be copied to <JAVA HOME>\jre\lib\ext, and the DLL to <JAVA HOME>\jre\bin. On my machine, <JAVA HOME> is c:\Program Files\Java\jdk1.6.0. If you ve installed the JRE as well, then also copy the JARs and DLL into the corresponding directories below <JRE HOME>. On my machine, <JRE HOME> is c:\Program Files\Java\jre1.6.0. One of Odejava s optional extras are classes that can semiautomatically map geoms to displayable entities in a particular graphics API. The main developer of Odejava, William Denniss, is also involved in Xith3D, and so the Odejava snapshot contains a Xith3D subdirectory holding classes for mapping geoms to Xith3D. A similar API for Java 3D, by Paul Byrne, can be found at https://odejava.dev.java.net/ in the contrib (0)\java3d-binding (1) folder. These mapping classes are rather difficult to understand and use and are perhaps better suited for complex geometries. I won t be using the Java 3D binding, since Balls3D only utilizes spheres.

The next layout control that we will look at is the Canvas control. The purpose of this container control is to allow objects placed within it to be positioned absolutely using a simple (x, y) coordinate system. Whereas the other containers we have looked at have taken control alignment and margins into consideration, all controls placed within a Canvas need to know is where they are positioned relative to the top-left corner of the Canvas itself. Just as controls placed into a Grid can set the Grid.Row and Grid.Column properties as part of their own element declaration, so controls placed into a Canvas can set its Canvas.Left and Canvas.Top properties to specify their positions. They will then appear at exactly the requested location, sized per their own Width and Height properties. This is a very useful container for games, as you will see in the next chapter, because clearly for any game we need to be able to position graphics on the screen at precise coordinates.

Much of the power of a view is contained in the SQL statement that defines the view. However, a number of syntax options in addition to the SELECT statement are important in building a view. The CREATE statement, with a complete list of user-defined fields looks like this: CREATE [OR REPLACE] [<algorithm attributes>] VIEW [database.]< name> [(<columns>)] AS <SELECT statement> [<check options>] When creating a view, you can use the OR REPLACE syntax to prevent a MySQL error in the instance that the view is already defined. In some cases, such as when you would rather be notified that you are overwriting an existing view, not using the OR REPLACE is preferred.

The Odejava API documentation can be downloaded as a ZIP file from http://odejava.org/ OdejavaDocs or can be viewed online at http://odejava.org/javadoc/. There s also a version in the Odejava snapshot, but it s combined with Xith3D API information, which I don t need. It s a good idea to download the ODE user guide, which explores ODE concepts and its API in detail. This is useful since much of the Odejava API is closely related to ODE. The user guide can be found at http://www.ode.org/ode-docs.html in HTML or PDF formats. The Odejava snapshot contains several example folders in the subdirectory odejava\odejava\src\org\odejava\test\. The simple\ folder is the place to start, and my Bouncer.java example (discussed in the next section) is a variant of its HighLevelApiExample.java. The car\ folder contains an example that models how a car moves over a bumpy terrain. The best source for help on Odejava is the Game Physics forum at http://www.javagaming.org/forums/index.php board=11.0. For ODE advice, there s a community page at the ODE site (http://www.ode.org/community.html), which includes a link to an ODE mailing list archive at http://ode.org/pipermail/ode/. Unfortunately, there s no search feature at the ODE.org site, but Google can be employed instead by including site:ode.org in search queries (e.g., type xode site:ode.org to scan the mailing list for references to xode, an XML data format for ODE. Another ODE forum, this one directly searchable, is at http://ode.petrucci.ch/.