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Adding two vectors together results in a new vector in which the corresponding elements in each of the source vectors are added together For example, adding the vector (5, 7) to the vector (3, 10) results in the vector (8, 17) Both addition and multiplication can be performed with negative values and work exactly as you would expect Vectors can also be subtracted from one another This very simple line of code therefore moves the rock in the direction and the speed that we have defined Once its position has been set, it is checked against the window boundaries to see whether it needs to wrap to the opposite side The rock s Draw code does nothing more than the SpriteObject, so this method is not overridden within the RockObject class Finally with this class is the DamageRock function, which will be called each time the rock is damaged.

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When the game code progresses a little further, we will call it when one of the player s bullets hits a rock At the moment, however, the only thing that will cause this function to be called is a collision with the player s ship DamageRock first checks the generation value If it is already 0, the rock has been destroyed and it is removed from the GameObjects list Otherwise, the code splits the rock into two, which is done by reinitializing the current rock at a slightly smaller size (calculated by multiplying the current size by.

The factory pattern was originally documented by the GoF in their famous book Design Patterns: Elements of Reusable Object-Oriented Software (Addison-Wesley Professional, 1994). The factory pattern is a creational pattern, and every developer should be familiar with it regardless of whether the context is ORM or another approach. At the heart of the factory pattern is encapsulation. As I mentioned in the Aggregates section earlier in this chapter, it is always a best practice to limit creation of objects in your domain. The factory pattern provides a standard technique for controlling the creation of objects and aggregates in your domain model. By using this technique in your domain model, you can decouple the creation of objects, thereby increasing flexibility and reusability. In addition, by using encapsulation, you can enforce any constraints in your aggregates and reduce the risk of corruption. As you may have realized, if at all possible I like to think of all patterns and object-oriented design in terms of real-world, nontechnical examples. The factory pattern is an easy one to think about in this manner. Similar to a factory producing potato chips, an object-oriented factory assembles all the pieces to create a final product for your consumption. Additionally,

// camera is at world space 200, 10, 200 from before camera->move(10, 0, 0); // camera moves to 210, 10, 200 camera->moveRelative(0, 0, 10); // camera moves to 210, 10, 210 We have to be careful with moveRelative() Since it is carried out in local space, the translation applied is relative to the camera s current orientation In the preceding examples, we assumed that the camera was originally aligned with the major axes, pointing in the normal +Z direction If the camera had been rotated 90 degrees to the right, for example, the moveRelative(0,0,10) call would have moved the camera to (220,10,200)..

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