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Let s use vectors to create more accurate diagonal movement. How would we move a sprite from one position on the screen to another, at a constant speed The first step is to create a vector from the current position to the destination (using Vector2.from_points or something similar). We only need the direction information in this vector, but not the magnitude, so we normalize it to give us the sprite s heading. Inside the game loop we calculate how far the sprite has moved with speed * time_passed_seconds, then multiply it by the heading vector. The resulting vector gives us the change in x and y since the previous frame, so we add it to sprite position. Listing 5-16 implements time-based movement using vectors. When you run it, you will see a sprite sitting motionless on the screen, but once you click the screen, the code will calculate a vector to the new position and set the sprite moving at 250 pixels per second. If you click again, a new vector will be calculated and the sprite will change its heading toward the mouse.

Now that you have logged on and connected to your Windows Home Server web site, you will see the Home tab of the Windows Home Server Web Site Remote Access home page, as shown in Figure 11-39.

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Contributions, big and small, are welcome. Many developers who make small changes to the kernel don t bother contributing their changes, because they view them as not important. If you ve made a change that fixes a problem, makes the kernel more stable, or adds a new feature, it will be welcomed by the open source community. You submit code to maintainers in the form of a patch. Patches show the differences between two files; in order for patches to work, both you and the recipient of the patch need to agree on the basis for the patch. In Linux, patches are made against the latest stable version of the Linux kernel. To submit a patch, follow these steps: 1. Fetch a copy of the kernel sources. Getting the Linux sources was described earlier in the chapter; the same instructions apply for this use case.

Unpack that kernel next to your kernel code. For example, say your Linux source tree is stored at ~/my-linux. You want to unpack the newly downloaded kernel so that my-linux and it share the same parent directory. The Linux kernel is constructed so that if you do the following, things will be correctly positioned for the next step:

Listing 5-16. Using Vectors for Time-Based Movement (vectormovement.py) background_image_filename = 'sushiplate.jpg' sprite_image_filename = 'fugu.png' import pygame from pygame.locals import * from sys import exit from gameobjects.vector2 import Vector2 pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) background = pygame.image.load(background_image_filename).convert() sprite = pygame.image.load(sprite_image_filename).convert_alpha() clock = pygame.time.Clock() position = Vector2(100.0, 100.0) speed = 250. heading = Vector2() while True: for event in pygame.event.get(): if event.type == QUIT: exit() if event.type == MOUSEBUTTONDOWN: destination = Vector2(*event.pos) Vector2(*sprite.get_size())/2. heading = Vector2.from_points(position, destination) heading.normalize() screen.blit(background, (0,0)) screen.blit(sprite, position) time_passed = clock.tick() time_passed_seconds = time_passed / 1000.0 distance_moved = time_passed_seconds * speed position += heading * distance_moved pygame.display.update()

Figure 11-39. The Windows Home Server Web Site Remote Access home page As you can see, there are three tabs: Home: The main home page where you can access the Computers and Shared Folders areas. Computers: Enables you to access any of your home computers that have Remote Access enabled and are supported. You can also access your Windows Home Server and make settings changes and anything else that can be performed using the Windows Home Server Console. You can also access this tab by clicking Computers on the Home tab. Shared Folders: Enables you to browse any shared folders you have access to, upload and download files, and more. You can also access this tab by clicking Shared Folders on the Home tab.

$ cd your-kernel-tree/.. $ tar xjf kernel-sources 3. Use diff to create a patch. Before you create a patch, the kernel must be in clean state, because the patch process finds all the differences between the two source trees. The distclean target does exactly that, removing output file and even editor backup files. Because your code and the kernel s source tree are in the same directory, creating a patch is easy:

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