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The contact points are found and converted to joints, and the physics simulation is advanced, thereby changing the position and orientation of the physics spheres. redraw() is called in PhySpheres to use those changes to modify the graphical sphere s position and orientation. examineContacts() loops through the contact points and converts those involving spheres into bouncing contact joints: private void examineContacts() { for (int i = 0; i < collCalcs.getContactCount(); i++) { contactInfo.setIndex(i); // look at the ith contact point // if contact involves a sphere, then make the contact bounce if ((contactInfo.getGeom1() instanceof GeomSphere) || (contactInfo.getGeom2() instanceof GeomSphere)) { contactInfo.setMode(Ode.dContactBounce); contactInfo.setBounce(1.0f); // 1 is max bounciness contactInfo.setBounceVel(0.1f); // min velocity for a bounce contactInfo.setMu(0); // 0 is friction-less } } } // end of examineContacts() The contact point details in contactInfo include references to the geoms involved in the collision. StepBehavior checks if either of them is a GeomSphere before configuring the joint to be very bouncy and frictionless. Another slightly more general way of identifying a geom is to examine its name using Geom.getName(). In Balls3D, all the sphere names start with Planet, followed by a number, so they are easy to recognize. makeSphereBody() in PhySphere assigns the name to the sphere s Body object, which gets taken up by its associated geom.

We will look more closely at the CREATE TRIGGER statement shortly. This trigger, as indicated in the CREATE TRIGGER statement, is set to activate prior to an update to records in the table. The before_customer_update trigger inserts a row into the customer_audit table each time a record is updated. We can see this in action by issuing an UPDATE statement, as shown in Listing 13-4. Listing 13-4. Updating customer Records mysql> UPDATE customer SET name=UCASE(name); Query OK, 6 rows affected (0.01 sec)

Figure 13 4. A Sprite control s properties within the Properties window Observe that the properties all have an immediate effect on the sprite within the page designer. Setting the sprite Source, scaling, and rotation: all these changes are shown in the designer as soon as they are modified. Also observe how modifying the Left and Top properties that we created have an immediate effect on the position of the sprite within the page designer (and vice versa).

A useful way of structuring the development of a Java 3D/Odejava application is to split it into two stages. The first stage involves the creation of the visual elements only the Java 3D scene without the physics. In the case of Balls3D, I implement the PhyBox and PhySphere classes without their Odejava methods (makeBoxGeom() and makeSphereBody()). I also leave out the StepBehavior and PhySpheres classes. This approach allows the graphical features of an application to be tested and debugged without the extra complexity of physics simulation. The second stage adds in the physics elements. Since the Odejava bodies and geoms are closely linked to their Java 3D counterparts, it s quite easy to decide which classes need augmenting. The basic StepBehavior class is always the same: a behavior using an elapsed time WakeupCondition. The code in processStimulus() is fairly standard, although the details of examineContacts() will vary depending on what geoms are of interest. Another advantage of developing the graphical side of the application first, is that it can show how things look when various parameters, such as gravity, friction, and the amount of bounce, are tweaked.

Note As of MySQL version 5.0.6, there is a bug with locking the correct tables when a trigger is activated.

Adding sprites at design time is useful, but many times we will actually need to create the sprites at runtime instead either because we need to create sprites dynamically or because the number of sprites is simply impractical to create through tedious design-time updates Runtime sprite creation is easily achieved and simply requires an instance of the Sprite user control to be created, initialized, and then added to the Children collection of the container that will host it (usually a Canvas control) The only potential point of complexity arises when setting the sprite s Source property So far, we have always set this using the XAML editor or the Properties window, but neither of these are available at runtime, so we will have to find the equivalent approach to set this using C# code.

Summary