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1 importrandom2 importpygame3 importsys4 from pygame.locals import *
5
6 Snakespeed = 17
7 Window_Width = 800
8 Window_Height = 500
9 Cell_Size = 20 #Width and height of the cells
10 #Ensuring that the cells fit perfectly in the window. eg if cell size was
11 #10 and window width or windowheight were 15 only 1.5 cells would
12 #fit.
13 assert Window_Width % Cell_Size == 0, "Window width must be a multiple of cell size."
14 #Ensuring that only whole integer number of cells fit perfectly in the window.
15 assert Window_Height % Cell_Size == 0, "Window height must be a multiple of cell size."
16 Cell_W = int(Window_Width / Cell_Size) #Cell Width
17 Cell_H = int(Window_Height / Cell_Size) #Cellc Height
18
19
20 White = (255, 255, 255)21 Black =(0, 0, 0)22 Red = (255, 0, 0) #Defining element colors for the program.
23 Green = (0, 255, 0)24 DARKGreen = (0, 155, 0)25 DARKGRAY = (40, 40, 40)26 YELLOW = (255, 255, 0)27 Red_DARK = (150, 0, 0)28 BLUE = (0, 0, 255)29 BLUE_DARK = (0, 0, 150)30
31
32 BGCOLOR = Black #Background color
33
34
35 UP = 'up'
36 DOWN = 'down' #Defining keyboard keys.
37 LEFT = 'left'
38 RIGHT = 'right'
39
40 HEAD = 0 #Syntactic sugar: index of the snake's head
41
42
43 defmain():44 globalSnakespeedCLOCK, DISPLAYSURF, BASICFONT45
46 pygame.init()47 SnakespeedCLOCK =pygame.time.Clock()48 DISPLAYSURF =pygame.display.set_mode((Window_Width, Window_Height))49 BASICFONT = pygame.font.Font('freesansbold.ttf', 18)50 pygame.display.set_caption('Snake')51
52 showStartScreen()53 whileTrue:54 runGame()55 showGameOverScreen()56
57
58 defrunGame():59 #Set a random start point.
60 startx = random.randint(5, Cell_W - 6)61 starty = random.randint(5, Cell_H - 6)62 wormCoords = [{'x': startx, 'y': starty},63 {'x': startx - 1, 'y': starty},64 {'x': startx - 2, 'y': starty}]65 direction =RIGHT66
67 #Start the apple in a random place.
68 apple =getRandomLocation()69
70 while True: #main game loop
71 for event in pygame.event.get(): #event handling loop
72 if event.type ==QUIT:73 terminate()74 elif event.type ==KEYDOWN:75 if (event.key == K_LEFT) and direction !=RIGHT:76 direction =LEFT77 elif (event.key == K_RIGHT) and direction !=LEFT:78 direction =RIGHT79 elif (event.key == K_UP) and direction !=DOWN:80 direction =UP81 elif (event.key == K_DOWN) and direction !=UP:82 direction =DOWN83 elif event.key ==K_ESCAPE:84 terminate()85
86 #check if the Snake has hit itself or the edge
87 if wormCoords[HEAD]['x'] == -1 or wormCoords[HEAD]['x'] == Cell_W or wormCoords[HEAD]['y'] == -1 or wormCoords[HEAD]['y'] ==Cell_H:88 return #game over
89 for wormBody in wormCoords[1:]:90 if wormBody['x'] == wormCoords[HEAD]['x'] and wormBody['y'] == wormCoords[HEAD]['y']:91 return #game over
92
93 #check if Snake has eaten an apply
94 if wormCoords[HEAD]['x'] == apple['x'] and wormCoords[HEAD]['y'] == apple['y']:95 #don't remove worm's tail segment
96 apple = getRandomLocation() #set a new apple somewhere
97 else:98 del wormCoords[-1] #remove worm's tail segment
99
100 #move the worm by adding a segment in the direction it is moving
101 if direction ==UP:102 newHead = {'x': wormCoords[HEAD]['x'],103 'y': wormCoords[HEAD]['y'] - 1}104 elif direction ==DOWN:105 newHead = {'x': wormCoords[HEAD]['x'],106 'y': wormCoords[HEAD]['y'] + 1}107 elif direction ==LEFT:108 newHead = {'x': wormCoords[HEAD][109 'x'] - 1, 'y': wormCoords[HEAD]['y']}110 elif direction ==RIGHT:111 newHead = {'x': wormCoords[HEAD][112 'x'] + 1, 'y': wormCoords[HEAD]['y']}113 wormCoords.insert(0, newHead)114 DISPLAYSURF.fill(BGCOLOR)115 drawGrid()116 drawWorm(wormCoords)117 drawApple(apple)118 drawScore(len(wormCoords) - 3)119 pygame.display.update()120 SnakespeedCLOCK.tick(Snakespeed)121
122
123 defdrawPressKeyMsg():124 pressKeySurf = BASICFONT.render('Press a key to play.', True, White)125 pressKeyRect =pressKeySurf.get_rect()126 pressKeyRect.topleft = (Window_Width - 200, Window_Height - 30)127 DISPLAYSURF.blit(pressKeySurf, pressKeyRect)128
129
130 defcheckForKeyPress():131 if len(pygame.event.get(QUIT)) >0:132 terminate()133 keyUpEvents =pygame.event.get(KEYUP)134 if len(keyUpEvents) ==0:135 returnNone136 if keyUpEvents[0].key ==K_ESCAPE:137 terminate()138 returnkeyUpEvents[0].key139
140
141 defshowStartScreen():142 titleFont = pygame.font.Font('freesansbold.ttf', 100)143 titleSurf1 = titleFont.render('Lei python!', True, White, DARKGreen)144 degrees1 =0145 degrees2 =0146 whileTrue:147 DISPLAYSURF.fill(BGCOLOR)148 rotatedSurf1 =pygame.transform.rotate(titleSurf1, degrees1)149 rotatedRect1 =rotatedSurf1.get_rect()150 rotatedRect1.center = (Window_Width / 2, Window_Height / 2)151 DISPLAYSURF.blit(rotatedSurf1, rotatedRect1)152
153 drawPressKeyMsg()154
155 ifcheckForKeyPress():156 pygame.event.get() #clear event queue
157 return
158 pygame.display.update()159 SnakespeedCLOCK.tick(Snakespeed)160 degrees1 += 3 #rotate by 3 degrees each frame
161 degrees2 += 7 #rotate by 7 degrees each frame
162
163
164 defterminate():165 pygame.quit()166 sys.exit()167
168
169 defgetRandomLocation():170 return {'x': random.randint(0, Cell_W - 1), 'y': random.randint(0, Cell_H - 1)}171
172
173 defshowGameOverScreen():174 gameOverFont = pygame.font.Font('freesansbold.ttf', 100)175 gameSurf = gameOverFont.render('Game', True, White)176 overSurf = gameOverFont.render('Over', True, White)177 gameRect =gameSurf.get_rect()178 overRect =overSurf.get_rect()179 gameRect.midtop = (Window_Width / 2, 10)180 overRect.midtop = (Window_Width / 2, gameRect.height + 10 + 25)181
182 DISPLAYSURF.blit(gameSurf, gameRect)183 DISPLAYSURF.blit(overSurf, overRect)184 drawPressKeyMsg()185 pygame.display.update()186 pygame.time.wait(500)187 checkForKeyPress() #clear out any key presses in the event queue
188
189 whileTrue:190 ifcheckForKeyPress():191 pygame.event.get() #clear event queue
192 return
193
194
195 defdrawScore(score):196 scoreSurf = BASICFONT.render('Score: %s' %(score), True, White)197 scoreRect =scoreSurf.get_rect()198 scoreRect.topleft = (Window_Width - 120, 10)199 DISPLAYSURF.blit(scoreSurf, scoreRect)200
201
202 defdrawWorm(wormCoords):203 for coord inwormCoords:204 x = coord['x'] *Cell_Size205 y = coord['y'] *Cell_Size206 wormSegmentRect =pygame.Rect(x, y, Cell_Size, Cell_Size)207 pygame.draw.rect(DISPLAYSURF, DARKGreen, wormSegmentRect)208 wormInnerSegmentRect =pygame.Rect(209 x + 4, y + 4, Cell_Size - 8, Cell_Size - 8)210 pygame.draw.rect(DISPLAYSURF, Green, wormInnerSegmentRect)211
212
213 defdrawApple(coord):214 x = coord['x'] *Cell_Size215 y = coord['y'] *Cell_Size216 appleRect =pygame.Rect(x, y, Cell_Size, Cell_Size)217 pygame.draw.rect(DISPLAYSURF, Red, appleRect)218
219
220 defdrawGrid():221 for x in range(0, Window_Width, Cell_Size): #draw vertical lines
222 pygame.draw.line(DISPLAYSURF, DARKGRAY, (x, 0), (x, Window_Height))223 for y in range(0, Window_Height, Cell_Size): #draw horizontal lines
224 pygame.draw.line(DISPLAYSURF, DARKGRAY, (0, y), (Window_Width, y))225
226
227 if __name__ == '__main__':228 try:229 main()230 exceptSystemExit:231 pass
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