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purpose of some examples, and to demonstrate that this table stores a historical view of the price and weight of the products when the order was made. If this were not done, price changes in the main product record would be reflected in past order details, where a different purchase price may have been used. In a real-world schema, you would use this technique for the customer s address information as well, which may change over the course of time. You might store the shipping address in the CustomerOrder table to represent the actual address used in the shipment. The ShippingMethod table has four fields min_order_weight, max_order_weight, min_ order_total, and max_order_total which may seem odd. These fields represent criteria that will be used to identify which shipping method can be used for a CustomerOrder. We ll take a closer look at these fields in our later examples covering range queries.

The following are the visual elements of the application: A green and blue checkerboard floor with a red square at its center and numbers along its x- and z- axes. A skybox of stars. An orbiting earth (a textured sphere). A billboard showing a tree, which rotates around its y-axis to always face the camera. Several shapes randomly placed flat on the ground. The shape image is a red R but it can be easily changed. The user can move around the world using the arrow keys to go forward and backward, to translate left, right, up, and down, and to turn left and right, but the player can t travel off the checkerboard or beyond the borders of the skybox. The game is terminated by pressing ESC, q, END, or Ctrl-c, or by clicking the close box. TourGL is a very basic game: the user must navigate over the shapes lying on the ground to make them disappear. The game ends when all the shapes are deleted, and a score is calculated based on how long it takes to delete them. Since TourGL utilizes the active rendering framework, the game automatically suspends when the window is iconified or deactivated and can be resized. TourGL also offers two extensions to the framework: A message is displayed in the canvas while the world is being initialized (see Figure 16-2). A Game Over 2D image with text is displayed when all the ground shapes have disappeared (see Figure 16-3). This stays onscreen until the application is terminated.

NOTE You could alternatively use the VertexPositionColorTexture structure, which has properties for both colors and texture coordinates. This will allow a texture and per-vertex colors to be used together.

Product product_id sku name description weight unit_price Product2Category product_id category_id Category category_id parent_id NULL name description left_side right_side

In the TexturedSquare example project, you will see that the _vertices array has been modified to use this new structure, as shown in Listing 6 20. Listing 6 20. The _vertices array using the VertexPositionTexture structure private VertexPositionTexture[] _vertices = new VertexPositionTexture[4]; To draw a square so that it displays the entire texture mapped on it, we specify u and v coordinates of (0, 1) for the bottom-left corner; (1, 1) for the bottom-right corner; (0, 0) for the top-left corner; and (1, 0) for the top-right corner. Each of these coordinates is specified for the vertex s TextureCoordinate property. Listing 6 21 contains the code required to initialize the vertex positions and texture coordinates for such a texture mapped square object. Listing 6 21. Creating a square from two triangles and displaying an entire texture on its surface _vertices[0].Position _vertices[1].Position _vertices[2].Position _vertices[3].Position = = = = new new new new Vector3(-1, -1, 0); Vector3(-1, 1, 0); Vector3(1, -1, 0); Vector3(1, 1, 0); = = = = new new new new Vector2(0, Vector2(0, Vector2(1, Vector2(1, 1); 0); 1); 0);

CustomerOrder CustomerOrderItem order_id order_id product_id price weight quality customer_id status shipping_method ordered_on shipping_price OrderStatus order_status_id description

Various OpenGL (JOGL) techniques are illustrated in this example, including transparent images as textures, 2D overlays, and bitmap and Java 2D fonts. The class diagrams for TourGL in Figure 16-4 highlight its use of active rendering.

_vertices[0].TextureCoordinate _vertices[1].TextureCoordinate _vertices[2].TextureCoordinate _vertices[3].TextureCoordinate

ShippingMethod shipping_method_id name cost min_order_weight max_order_weight min_order_total max_order_total

Figure 16-4. Class diagrams for TourGL The TourGL class creates the GUI, which consists of the threaded canvas, TourCanvasGL, and two text fields at the bottom of the window. TourGL captures window and component resizing events and calls methods in TourCanvasGL to pause, resume, stop, and resize the 3D scene. It also has two set methods for its text fields: setShapesLeft() and setTimeSpent(). They re called by TourCanvasGL to report the number of remaining shapes and the game s running time. GroundShapes positions the shapes on the floor and manages their drawing at runtime.