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Using Linux grants a great degree of freedom when you re selecting an approach to use when implementing a project; the same tools available on a desktop are available for an embedded project. The great variety of tools is very liberating for engineers who could only code in C in years past now you can use C++, Perl, C#, shell scripts, Python, or Java to build an application. Picking the right tool for the job is an important decision that involves knowing the nature of the application and the hardware constraints. Not only does Linux give you great freedom in selecting development tools, but the environment also doesn t limit the selection to one. Using a mix of C and Java is a perfectly good idea if the device will be communicating with an enterprise server that s running Java. It s also entirely practical to use C++ as the tool for the UI development while using a mix of shell scripts and Perl to process data. When you re selecting what to use for application development, the key isn t to focus on picking one right tool; the important part is to identify what the application is doing and then choose the correct development tools for different parts of the job. This chapter starts by discussing the importance of understanding requirements: many projects get off on the wrong foot and never recover because the goals are never well understood by all involved. That results in the wrong choices being made. Embedded development can have some interesting twists and include requirements not found in other projects. Knowing about those twists before you start helps you identify risky parts of the project sooner. To paraphrase a random U.S. politician, There are unknowns and unknown unknowns. This chapter makes both less mysterious.

A subsurface is a surface inside another surface. When you draw onto a subsurface, it also draws onto its parent surface. One use of subsurfaces is to draw graphical fonts. The pygame.font module produces nice, crisp-looking text in a single color, but some games require more graphically rich lettering. You could save an image file for each letter, but it would probably be easier to create a single image with all the letters on it, and then create 26 subsurfaces when you load the image into Pygame. To create a subsurface, you call the subsurface method of Surface objects, which takes a rectangle that defines what portion of the parent it should cover. It will return a new Surface object that has the same color format as the parent. Here s how we might load a font image and divide it into letter-sized portions: my_font_image = Pygame.load("font.png") letters = [] letters["a"] = my_font_image.subsurface((0,0), (80,80)) letters["b"] = my_font_image.subsurface((80,0), (80,80)) This creates two subsurfaces of my_font_image and stores them in a dictionary so that we can easily look up the subsurface for a given letter. Of course, we would need more than a and b, so the call to subsurface would probably be in a loop that repeats 26 times. When you work with subsurfaces, it is important to remember that they have their own coordinate system. In other words, the point (0, 0) in a subsurface is always the top-left corner no matter where it sits inside its parent.

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To view pictures on your Xbox 360 streamed from the Photos shared folder, follow these steps: 1. Select Pictures on the Media blade. 2. On the Pictures menu, select Computer, as shown in Figure 10-8.

Knowing your application means understanding the requirements of the project. The requirements, in the software world, specify what the application must do. The process behind requirements is a book in itself; 1 however, the Zen of requirements boils down to the following:

1. 2. 3. 4. Requirements are written. Changes are tracked. Project participants understand the requirements. The requirements explain what and not how.

When you create an image on the display, you should cover the entire screen; otherwise, parts of the previous screen will show through. If you don t draw over every pixel, you will get an unpleasant strobing effect when you try to animate anything. The easiest way to avoid this is to clear the screen with a call to the fill method of surface objects, which takes a color. The following will clear the screen to black: screen.fill((0, 0, 0)) The fill function also takes an optional rectangle that defines the area to clear, which is a convenient way to draw solid rectangles.

Figure 10-8. Select your Windows Home Server on the Pictures menu. 3. As shown in Figure 10-9, you can either choose to play a slideshow of all of your pictures, or select the Photos folder. If you select the Photos folder, you can click any available folder to view its contents, as shown in Figure 10-10.

I recommend reading the excellent Managing the Software Process by Watts Humphrey (Addison-Wesley Professional, 1989).

Note If you draw over the entire screen with other methods, you won t need to clear it with a call to fill.

To watch videos on your Xbox 360 streamed from the Videos shared folder (or the Pictures shared folder, if applicable), follow these steps:

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