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pressed_keys = pygame.key.get_pressed() rotation_direction = 0. movement_direction = 0. if pressed_keys[K_LEFT]: rotation_direction = +1.0 if pressed_keys[K_RIGHT]: rotation_direction = -1.0 if pressed_keys[K_UP]: movement_direction = +1.0 if pressed_keys[K_DOWN]: movement_direction = -1.0 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/180.0) heading_y = cos(sprite_rotation*pi/180.0) heading = Vector2(heading_x, heading_y) heading *= movement_direction sprite_pos+= heading * sprite_speed * time_passed_seconds pygame.display.update() Listing 6-3 works in a similar way to the previous example, but it calculates the heading differently. Rather than create a heading vector from whatever keys are pressed, we create the heading from the rotation of the sprite (stored in the variable sprite_rotation). It is this value that we modify when the appropriate key is pressed. When the Right key is pressed, we add to the sprite rotation, turning it one way. And when the Left key is pressed, we subtract from the rotation to turn it in the opposite direction. To calculate the heading vector from the rotation, we must calculate the sine and cosine of the angle, which we can do with the sin and cos functions found in the math module. The sin function calculates the x component, and cos calculates the y component. Both functions take an angle in radians (there are 2 * pi radians in a circle), but since Listing 6-3 uses degrees it has to convert the

The word thread is frequently used to describe any process, but in Linux a thread and a process are very different entities. The work necessary to start a thread in Linux is very low compared to the effort necessary to start a process. When a process is started via fork(), Linux makes a copy of the current state of the running program, including resources like file handles and network connections. When the kernel starts a thread, the thread runs in the context of the current process and doesn t have a separate set of resources.

Caution Use the Overwrite Existing Files check box with caution because it will overwrite all files with

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When you re creating threads for the application to use, consider reducing the default amount of stack space given to each thread from the default of 8MB to 2 or 3MB. An 8MB stack area is very large, and unless the application is doing a lot of recursive calls, a smaller stack can be used. You set the stack size when using the POSIX thread library as follows: #include <pthread.h> #include <stddef.h> pthread_t theadHand; pthread_attr_t smallerStack; size_t stackSize = PTHREAD_STACK_MIN + 0x2000; pthread_attr_init(&smallerStack); pthread_attr_setstacksize(smallerStack, PTHREAD_STACK_MIN + 0x2000); pthread_create(threadHand, smallerStack, threadEntryPoint, NULL); Creating threads with a smaller stack size is of increased importance when you re using a system that locks all memory: a few threads can consume a large slice of memory when you re allocating 8MB just for the stack. Reducing the stack size to the minimum allowed means the memory reserved for the stack but never used isn t wasted.

rotation to radians by multiplying by pi and dividing by 180. After we assemble the heading vector from the two components, it can be used as before to give us time-based movement. Before Listing 6-3 displays the sprite, the sprite is rotated visually so we can see which way it is facing. This is done with a function from the transform module called rotate, which takes a surface plus an angle and returns a new surface containing the rotated sprite. A problem with this function is that the returned sprite may not have the same dimensions as the original (see Figure 6-2), so we can t blit it to the same coordinate as the unrotated sprite or it will be drawn in the wrong position on screen. A way to work around this is to draw the sprite in a position that puts the center of the sprite image underneath the sprite s position on screen. That way, the sprite will be in the same position on the screen regardless of the size of the rotated surface.

the same name from your upload list. So if you have a file that you don t want overwritten as well as some files that you do want overwritten, it is advisable to upload them separately.

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