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Pygame is a powerful platform for building games. It consists of many submodules for a variety of game-related tasks. Pygame works equally well on a large number of platforms. Ports are available for all the major desktop systems and even some consoles so you can develop a game on your favorite platform and play it on another. We ve produced a Hello World script that demonstrates the basics of starting Pygame, creating a display, receiving events, and then drawing to the screen steps that you will use when creating more sophisticated games and demos. If you have done any game programming in C or C++, you will appreciate the simplicity of the code, especially the one-liner to create a display.

A programmer from the imperative world might have expected that message, when printed out for the final time, would be bound to the value Very Important, rather than Important. It holds the value Important because the identifier message is rebound, rather than assigned, to the value Very Important inside the function innerFun, and this binding is valid only inside the scope of the function innerFun. Therefore, once this function has finished, the identifier message reverts to holding its original value.

n the previous chapter, we developed an iteration plan for our sample project. Now we re ready to work on the first iteration. This chapter will be mainly from a developer s perspective of the iteration. We will take a quick look at what other XP team members are doing, but the actual output of those roles will not be demonstrated. The goal of this chapter is to demonstrate the developer s XP practices in action. To get your environment prepared for this chapter, you need to walk through the steps outlined in Appendix A. In Appendix A, you will be guided through how to set up a Visual Studio solution with multiple projects. This type of solution/project configuration works well for development projects that have multiple team members.

Note Using inner functions is a common and excellent way of breaking up a lot of functionality into manageable portions, and you will see their usage throughout the book. They are sometimes referred to as closures or lambdas, although these two terms have more specific meanings. A closure means that the function uses a value that is not defined at the top level. A lambda is an anonymous function.

We explored the flags you can use when creating a display, which can improve performance or add capabilities. It is probably best to leave most of these flags disabled, at least until you are more familiar with Pygame and computer graphics in general. You should find that the default settings still give you excellent performance. You also learned how to manage the event queue to handle the various events that Pygame can send you, and you even learned how to create custom events. Listing 2-3 lets you see exactly what events are generated and the information they contain. You will find this listing to be a handy tool when you experiment with your own script. This chapter covered all the boilerplate code you need to get up and running with Pygame. The next chapter examines graphics, movement, and animation.

n XP, an application or system is developed in the context of a project. A project defines all the features of the application or system. Release planning happens at the beginning of each project. In XP a project is broken up , into one or more releases. Each release must deliver enough features to be of value to the business. As noted in 1, an XP practice is to do small releases, so you want to select just enough business functionality and set that as the target release. A release represents a collection of user stories that provide the features. If the collection of user stories in the release is a subset of the total user stories for the whole project, then the project will have multiple releases. The interval between releases is usually 30 to 180 days. Only the current release is planned in recognition of the changes that can occur on a project. It s quite possible that a business change would be significant enough to invalidate any plans of the future releases. Release planning involves two phases: exploration and the planning game. In this chapter, we will look at both of these phases. You ll learn what the phase activities are and what value they provide to the software development life cycle.