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def run(): pygame.init() screen = pygame.display.set_mode(SCREEN_SIZE, HWSURFACE|OPENGL|DOUBLEBUF) resize(*SCREEN_SIZE) init() clock = pygame.time.Clock() # This object renders the 'map' map = Map() # Camera transform matrix camera_matrix = Matrix44() camera_matrix.translate = (10.0, .6, 10.0) # Initialize speeds and directions rotation_direction = Vector3() rotation_speed = radians(90.0) movement_direction = Vector3() movement_speed = 5.0

Almost everyone agrees that this sort of structure is the best way to organize an application, but it s not always easy to implement this design. Though the plan looks simple, modern user interfaces are usually quite complicated, and sometimes make assumptions or have expectations about the way they will receive information. The result is that everyone recommends this model, but very few developers follow it successfully. The problems, although not insurmountable, are found in every tier. The next three sections explain some of the challenges you ll face.

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Though it doesn t explicitly state it, three-tier design requires a fair degree of consistency among user-interface controls In the real world, this consistency doesn t exist For example, making what is conceptually a minor change like substituting a ListView control for a DataGridView requires a totally different access model The DataGridView is filled exclusively by data binding The ListView, on the other hand, acts like a collection of items To get information into other ListView columns, you need to add a collection of fields to each individual item These quirks are easy enough to master, but they don t make it possible to create business objects that can quickly and efficiently fill common controls For example, consider an application that reads customer information from a database and displays it in an attractive list control At first glance, it seems like a straightforward task.

You ve seen and worked with UDTs earlier on in 5 of this book. UDTs are a great way to pass entire business objects from one application to another (without the need to do any serialization), since Oracle can represent UDTs natively in the database. Let s first define the UDT object via SQL*Plus:

But consider the number of different ways it could be modeled with objects: A CustomerDb class fetches information from the database, and returns it as a DataSet Your form code then manually reads the DataSet and adds the information to a list control A CustomerDb class fetches information from the database You also create a custom CustomerList control class that knows how to fill itself using the DataSet it receives from CustomerDb A CustomerDb class fetches information from the database However, the CustomerDb class also receives a reference to the list control that needs to be filled The CustomerDb class has the built-in smarts to know how to fill the list control s collection of items A CustomerDb class fetches information from the database A helper class, FillListFromDataSet, handles the conversion of the information in the DataSet to information in the generic list control.

while True: for event in pygame.event.get(): if event.type == QUIT: return if event.type == KEYUP and event.key == K_ESCAPE: return # Clear the screen, and z-buffer glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); time_passed = clock.tick() time_passed_seconds = time_passed / 1000. pressed = pygame.key.get_pressed() # Reset rotation and movement directions rotation_direction.set(0.0, 0.0, 0.0) movement_direction.set(0.0, 0.0, 0.0) # Modify direction vectors if pressed[K_LEFT]: rotation_direction.y = elif pressed[K_RIGHT]: rotation_direction.y = if pressed[K_UP]: rotation_direction.x = elif pressed[K_DOWN]: rotation_direction.x = if pressed[K_z]: rotation_direction.z = elif pressed[K_x]: rotation_direction.z = if pressed[K_q]: movement_direction.z = elif pressed[K_a]: movement_direction.z = for key presses +1.0 -1.0 -1.0 +1.0 -1.0 +1.0 -1.0 +1.0

CREATE TYPE EDZEHOO.Jobs_Type AS object(

Which approach is the best one It s difficult to say The first approach does the trick, but probably isn t generic enough, which will limit your ability to reuse your solution The second approach also works, but is probably too much effort because you ll need to create a dedicated custom control The third option is suspicious, because it seems that the CustomerDb class is being given additional responsibilities beyond the scope it was designed for Overall, some variation on the final option will probably give you the best tradeoff between simplicity and reusability By dividing the solution up into an extra piece (FillListFromDataSet), it makes the user interface more loosely coupled But the greatest problem with all of these examples is that there is no guarantee that the other classes in the application will follow this pattern.

And it should come as no surprise that when you read the vast quantity of NET articles and books, you ll see examples of all of these techniques..

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