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You have seen that drawing a mouse cursor on the screen is quite straightforward: you simply need to get the coordinates of the mouse from a MOUSEMOTION event or directly from the pygame.mouse.get_pos function. Either method is fine if you just want to display a mouse cursor, but mouse movement can also be used to control something other than an absolute position, such as rotating or looking up and down in a 3D game. In this case, we can t use the mouse position directly because the coordinates would be restricted to the edges of the screen, and we don t want the player to be restricted in how many times he turns left or right! In these situations, we want to get the relative movement of the mouse, often called the mouse mickeys, which just means how far the mouse has moved since the previous frame. Listing 6-4 adds mouse rotation movement to the sprite demo. In addition to the cursor keys, the sprite will rotate when the mouse is moved left or right. Listing 6-4. Rotational Mouse Movement (mouserotatemovement.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 from math import * 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() pygame.mouse.set_visible(False) pygame.event.set_grab(True) sprite_pos = Vector2(200, 150) sprite_speed = 300. sprite_rotation = 0. sprite_rotation_speed = 360. # Degrees per second while True: for event in pygame.event.get(): if event.type == QUIT: exit() if event.type == KEYDOWN: if event.key == K_ESCAPE: exit()

After you install this library and fix the make file, you can build latencytop with this command: $ CC=arm-unknown-linux-gnueabi-gcc DESTDIR=/path/to/rfs make make install Of course, change CC and DESTDIR to match your environment After it s compiled, run latencytop as root with no arguments to get the ncurses-based interface The output at the top of the screen shows what is causing the latency on a system-wide basis for the last 30 seconds (see Figure 12-2) In this example, it shows that that highest latency operation, with a wait of nearly 25 milliseconds, is due to the ext file system reading data from the disk; that is responsible.

Note The amount of time it will take to upload the files to your shared folder will depend on a number of

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for about 1% of the latency as a whole. However, waiting for events using polling (instead of waiting for an event to trigger, like a character ready to be read, the software asks if there s something to be read) is responsible for 60% of the latency events. As a programmer working on a real-time system, your goal is to reduce the largest latency sources first, because they re responsible for the greatest sources of unpredictability.

pressed_keys = pygame.key.get_pressed() pressed_mouse = pygame.mouse.get_pressed() rotation_direction = 0. movement_direction = 0. rotation_direction = pygame.mouse.get_rel()[0] / 3. if pressed_keys[K_LEFT]: rotation_direction = +1. if pressed_keys[K_RIGHT]: rotation_direction = -1. if pressed_keys[K_UP] or pressed_mouse[0]: movement_direction = +1. if pressed_keys[K_DOWN] or pressed_mouse[2]: movement_direction = -1. screen.blit(background, (0,0)) rotated_sprite = pygame.transform.rotate(sprite, sprite_rotation) w, h = rotated_sprite.get_size() sprite_draw_pos = Vector2(sprite_pos.x-w/2, sprite_pos.y-h/2) screen.blit(rotated_sprite, sprite_draw_pos) time_passed = clock.tick() time_passed_seconds = time_passed / 1000.0 sprite_rotation += rotation_direction * sprite_rotation_speed * time_passed_seconds heading_x = sin(sprite_rotation*pi/180.) heading_y = cos(sprite_rotation*pi/180.) heading = Vector2(heading_x, heading_y) heading *= movement_direction sprite_pos+= heading * sprite_speed * time_passed_seconds pygame.display.update() To use the mouse to control sprite rotation, Listing 6-4 has to enable virtual infinite area for the mouse, which prevents Pygame from restricting the mouse to the physical screen area. This is done with the following two lines: pygame.mouse.set_visible(False) pygame.event.set_grab(True)

factors, including the speed of the Internet connection on the computer you are uploading from, the speed of the Internet connection that your Windows Home Server is connected to, the number and size of the files your are uploading, and more.

The left and right arrows move you through a list of processes currently running on the system. The bottom part of the page shows the latency measurements for a selected process. Use the Q key to quit. Output from this program is also available in text format, in case the target machine doesn t support a terminal that can support ncurses output. Use the -d parameter: # latencytop -d [max 5.0msec] [max [max [max [max [max 1.44 msec (23.3%) 5.0msec] 0.50 msec (75.4%) 0.8msec] 0.59 msec (0.5%) 0.8msec] 0.70 msec (0.4%) 0.5msec] 0.51 msec (0.1%) 0.2msec] i915_wait_irq i915_irq_wait \ SCSI cdrom ioctl opening cdrom device Executing raw SCSI command Waiting for event (poll)

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