Game Programming Class9

Review Midterm Games

Inclass look @ 2d games

1. Functionality
2. Game play
3. Localization
4. Overall stability
5. Performance
6. Usability and overall experience

Observer

Observer

Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

Observers

http://www.dofactory.com/Patterns/PatternObserver.aspx

Observer is a design pattern that is often used to publish (push) or subscribe (pull) changes in the stae of one object to other interested object. It encourages loose coupling of objects.

The object the get the data often called the subject then notifies the observing objects of the change. The observing object will often repond to the subject.

Here is a real example in c#. In this example a stock (the subject) notifies and investor (the observer) of a change in price.

http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class13/Observer_j.cs

http://iam.colum.edu/oop/classsource/class13/Observer.aspx - source

Homework

Add screen to 2D Game