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The arc function draws just a section of an ellipse, but only the edge; there is no fill option for arc. Like the ellipse function, it takes a Rect-style object that the arc would fit into (if it covered the entire ellipse). It also takes two angles in radians. The first angle is where the arc should start drawing, and the second is where it should stop. It also takes a width parameter for the line, which defaults to 1, but you can set it to greater values for a thicker line. Listing 4-13 draws a single arc that fits into the entire screen. The end angle is taken from the x coordinate of the mouse, so if you move the mouse left and right it will change the length of the arc. Listing 4-13. Arc Test import pygame from pygame.locals import * from sys import exit from random import * from math import pi pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) while True: for event in pygame.event.get(): if event.type == QUIT: exit() x, y = pygame.mouse.get_pos() angle = (x/639.)*pi*2. screen.fill((255,255,255)) pygame.draw.arc(screen, (0,0,0), (0,0,639,479), 0, angle) pygame.display.update()

name main (bubblesort.c:38 @ main (bubblesort.c:37 @

To configure your domain name, follow these steps: 1. Click Setup next to the Domain Name option, as shown in Figure 11-13. This launches the Domain Name Setup Wizard, as shown in Figure 11-14.

15.25 8048679) 7.63 804859f) 6.14 80485a7) 5.08 80485b1) 4.03 8048594) 2.44 8048655) 1.27 80485bb) 4.72

Note You need a Windows Live ID to set up a domain name. If you don t have one, see the Creating a

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A call to pygame.draw.line will draw a line between two points. After the surface and color, it takes two points: the start point and the end point of the line you want to draw. There is also the optional width parameter, which works the same way as rect and circle. Listing 4-14 draws several lines from the edges of the screen to the current mouse position. Listing 4-14. Line Drawing (drawinglines.py) import pygame from pygame.locals import * from sys import exit

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2. Click Next to continue. 3. You must sign in to Windows Live to continue. Enter your Windows Live ID e-mail address and password to sign in to Windows Live, as shown in Figure 11-15.

pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) while True: for event in pygame.event.get(): if event.type == QUIT: exit() screen.fill((255, 255, 255)) mouse_pos = pygame.mouse.get_pos() for x in xrange(0,640,20): pygame.draw.line(screen, (0, 0, 0), (x, 0), mouse_pos) pygame.draw.line(screen, (0, 0, 0), (x, 479), mouse_pos) for y in xrange(0,480,20): pygame.draw.line(screen, (0, 0, 0), (0, y), mouse_pos) pygame.draw.line(screen, (0, 0, 0), (639, y), mouse_pos) pygame.display.update()

main (bubblesort.c:39 @ swap (bubblesort.c:21 @ swap (bubblesort.c:22 @ swap (bubblesort.c:23 @ swap (bubblesort.c:18 @ main (bubblesort.c:37 @ main (bubblesort.c:27 @ swap (bubblesort.c:25 @ 80485b9)

Figure 11-15. Sign in to Windows Live. 4. Click Next to continue. The next screen of the wizard is the Privacy Statement and Agreement, as shown in Figure 11-16. Read the Windows Home Server Privacy Statement and the Windows Live Custom Domains Addendum.

From this, it s obvious that you should examine lines 38-39 of main() in bubblesort.c to see whether the code can be optimized to run faster. The code in question is the following: for(j = 0; j < ELEMENTS-1; j++) if(vector[j] > vector[j+1]) { swap(vector + j + 1, vector + j); On inspection, it seems that you can make some optimizations. Because this program was compiled without any optimization, the easiest thing to do is let GCC do the optimizations by compiling with the O3 flag, which instructs the compiler to build the most optimized code possible: $(CC) bubblesort.c -O3 -g -pg -o bubblesort After you run the program, gprof reports the following: 30.48 8048668) 26.37 8048675) 19.18 804866f) 11.99 804867a) 11.99 8048672) 0.45 0.83 1.11 1.28 1.46 0.45 0.39 0.28 0.17 0.17 main (bubblesort.c:38 @ swap (bubblesort.c:23 @ swap (bubblesort.c:21 @ main (bubblesort.c:37 @ swap (bubblesort.c:22 @

Often lines are drawn in sequence, so that each line begins where the previous one left off. The first parameter to pygame.draw.lines is a boolean that indicates whether the line is closed. If set to True an additional line will be drawn between the last point in the list and the first; otherwise, it will be left open. Following this value is a list of points to draw lines between and the usual width parameter. Listing 4-15 uses pygame.draw.lines to draw a line from a list of points, which it gets from the mouse position. When there are more than 100 points in the list, it deletes the first one, so the line miraculously starts to undraw itself! This might be a good starting point for a worm game. Listing 4-15. Drawing Multiple Lines (multiplelines.py) import pygame from pygame.locals import * from sys import exit pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) points = [] while True:

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