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Are there times when XP is not the right choice Certainly there are. As you ve learned, communication is a key value of XP The larger the number of individuals directly involved in a . project, the more difficult it gets to manage face-to-face communication. Therefore, it would seem that XP is not well suited for projects with extremely large teams. But note that our experience has indicated that large project teams are rarely, if ever, a good idea. Another instance where XP might not be the best choice is for a project with requirements that will never change. This phenomenon is rare indeed, and we have not seen such a project in all our years of experience. Industry sectors such as space or military may fall into the solid requirements category. Finally, remember that XP requires a significant amount of customer involvement. If your customer is not willing to invest the necessary amount of project time, you will be hardpressed to successfully execute XP .

Listing 9-4. Resizing the Viewport def resize(width, height): glViewport(0, 0, width, height) glMatrixMode(GL_PROJECTION) glLoadIdentity() gluPerspective(60., float(width)/height, 1., 10000.) glMatrixMode(GL_MODELVIEW) glLoadIdentity() The resize function in Listing 9-4 takes the width and height of the screen, and should be called when the display is initialized or the screen dimensions change. The call to glViewport tells OpenGL that we want to use the area of the screen from coordinate (0, 0), with a size of (width, height), that is, the entire screen. The next line calls glMatrixMode(GL_PROJECTION), which tells OpenGL that all further calls that work with matrices will apply to the projection matrix. It is followed by a call to glLoadIdentity, which resets the projection matrix to identity, and a call to gluPerspective (from the GLU library), which sets a standard perspective projection matrix. This function takes four parameters: the field of view of the camera, the aspect ratio (width divided by height), followed by the near and far clipping planes. These clipping planes define the range of distances that can be seen ; anything outside that range won t be visible to the player. The viewable area in the 3D screen is called the viewing frustum (see Figure 9-6), which resembles a pyramid with a portion of the top cut off.

One extremely useful feature of imperative programming in F# is the ability to use just about any library written in a NET programming language, including the many methods and classes available as part of the BCL itself I consider this to be imperative programming because libraries written in other languages make no guarantees about how state works inside them, so you can t know whether a method you call has side effects A distinction should be made between calling libraries written in F# and libraries written in any other language This is because libraries written in F# have metadata that describes extra details about the library, such as whether a method takes a tuple or whether its parameters can be curried This metadata is specific to F#, and it is stored in a binary format as a resource to the generated assembly This is largely why the MicrosoftFSharp.

Summary

The resize function is enough to start using OpenGL functions to render to the screen, but there are a few other things we should set to make it more interesting (see Listing 9-5).

Reflection API is provided: to bridge the gap between F# and NET metadata You use the same basic syntax when calling static or instance properties or methods Method calls to a non-F# library must have their arguments separated by commas and surrounded by parentheses (Remember, F# function calls usually use whitespace to separate arguments, and you need to use parentheses only to impose precedence) Method calls to a non-F# library cannot be curried; in fact, methods from non F# libraries behave as though they take a tuple of arguments Despite this difference, calling a method from a non-F# library is straightforward You start off by using static properties and methods: open SystemIO // test whether a file "testtxt" exist if FileExists("testtxt") then printfn "Text file \"testtxt\" is present" else printfn "Text file \"test.