1+ import pygame
2+
3+ class Ball (pygame .sprite .Sprite ):
4+ '''This class defines the sprite for our Ball.'''
5+ def __init__ (self , screen ):
6+ '''This initializer takes a screen surface as a parameter, initializes
7+ the image and rect attributes, and x,y direction of the ball.'''
8+ # Call the parent __init__() method
9+ pygame .sprite .Sprite .__init__ (self )
10+
11+ # Set the image and rect attributes for the Ball
12+ self .image = pygame .Surface ((20 , 20 ))
13+ self .image .fill ((0 , 0 , 0 ))
14+ self .image .set_colorkey ((0 ,0 ,0 ))
15+ pygame .draw .circle (self .image , (255 , 0 , 0 ), (10 , 10 ), 10 , 0 )
16+ #self.image = pygame.image.load("ball.jpg")
17+ self .rect = self .image .get_rect ()
18+ self .rect .center = (screen .get_width ()/ 2 ,screen .get_height ()/ 2 )
19+
20+ # Instance variables to keep track of the screen surface
21+ # and set the initial x and y vector for the ball.
22+ self .window = screen
23+ self .dx = 5 #5
24+ self .dy = - 3 #-3
25+
26+ def changeDirection (self ):
27+ '''This method causes the x direction of the ball to reverse.'''
28+ if self .dx < 0 :
29+ self .dx -= 1
30+ elif self .dx > 1 :
31+ self .dx += 1
32+ elif self .dy < 0 :
33+ self .dx -= 1
34+ elif self .dy > 1 :
35+ self .dy += 1
36+
37+ self .dx = - self .dx
38+
39+
40+ def update (self ):
41+ '''This method will be called automatically to reposition the
42+ ball sprite on the screen.'''
43+ # Check if we have reached the left or right end of the screen.
44+ # If not, then keep moving the ball in the same x direction.
45+ if ((self .rect .left > 0 ) and (self .dx < 0 )) or \
46+ ((self .rect .right < self .window .get_width ()) and (self .dx > 0 )):
47+ self .rect .left += self .dx
48+ # If yes, then reverse the x direction.
49+ else :
50+ self .dx = - self .dx
51+
52+ # Check if we have reached the top or bottom of the court.
53+ # If not, then keep moving the ball in the same y direction.
54+ if ((self .rect .top - 40 > 0 ) and (self .dy > 0 )) or \
55+ ((self .rect .bottom + 40 < self .window .get_height ()) and (self .dy < 0 )):
56+ self .rect .top -= self .dy
57+ # If yes, then reverse the y direction.
58+ else :
59+ self .dy = - self .dy
60+
61+ class Player (pygame .sprite .Sprite ):
62+ '''This class defines the sprite for Player 1 and Player 2'''
63+ def __init__ (self , screen , playerNum ):
64+ '''This initializer takes a screen surface, and player number as
65+ parameters. Depending on the player number it loads the appropriate
66+ image and positions it on the left or right end of the court'''
67+ # Call the parent __init__() method
68+ pygame .sprite .Sprite .__init__ (self )
69+
70+ # Define the image attributes for a black rectangle.
71+ #self.image = pygame.Surface((10, 100))
72+ #self.image = self.image.convert()
73+ #self.image.fill((0, 0, 0))
74+ self .image = pygame .image .load ("twig.jpg" )
75+ self .rect = self .image .get_rect ()
76+
77+ # If we are initializing a sprite for player 1,
78+ # position it 10 pixels from screen left.
79+ if playerNum == 1 :
80+ self .rect .left = 10
81+ # Otherwise, position it 10 pixels from the right of the screen.
82+ else :
83+ self .rect .right = screen .get_width ()- 10
84+
85+ # Center the player vertically in the window.
86+ self .rect .top = screen .get_height ()/ 2 + 50
87+ self .window = screen
88+ self .dy = 0
89+
90+ def changeDirection (self , xyChange ):
91+ '''This method takes a (x,y) tuple as a parameter, extracts the
92+ y element from it, and uses this to set the players y direction.'''
93+ self .dy = xyChange [1 ]
94+
95+ def update (self ):
96+ '''This method will be called automatically to reposition the
97+ player sprite on the screen.'''
98+ # Check if we have reached the top or bottom of the screen.
99+ # If not, then keep moving the player in the same y direction.
100+ if ((self .rect .top > 0 ) and (self .dy > 0 )) or \
101+ ((self .rect .bottom < self .window .get_height ()) and (self .dy < 0 )):
102+ self .rect .top -= (self .dy * 7 ) #5
103+ # If yes, then we don't change the y position of the player at all.
104+
105+ class EndZone (pygame .sprite .Sprite ):
106+ '''This class defines the sprite for our left and right end zones'''
107+ def __init__ (self , screen , xPosition ):
108+ '''This initializer takes a screen surface, and x position as
109+ parameters. For the left (player 1) endzone, x_position will = 0,
110+ and for the right (player 2) endzone, x_position will = 639.'''
111+ # Call the parent __init__() method
112+ pygame .sprite .Sprite .__init__ (self )
113+
114+ # Our endzone sprite will be a 1 pixel wide black line.
115+ self .image = pygame .Surface ((1 , screen .get_height ()))
116+ self .image = self .image .convert ()
117+ self .image .fill ((0 , 0 , 0 ))
118+
119+ # Set the rect attributes for the endzone
120+ self .rect = self .image .get_rect ()
121+ self .rect .left = xPosition
122+ self .rect .top = 0
123+
124+ class ScoreKeeper (pygame .sprite .Sprite ):
125+ '''This class defines a label sprite to display the score.'''
126+ def __init__ (self ):
127+ '''This initializer loads the system font "Arial", and
128+ sets the starting score to 0:0'''
129+ # Call the parent __init__() method
130+ pygame .sprite .Sprite .__init__ (self )
131+
132+ # Load our custom font, and initialize the starting score.
133+ self .font = pygame .font .Font ("walt.ttf" , 30 )
134+ #self.font = pygame.font.SysFont("Arial", 30)
135+ self .player1Score = 0
136+ self .player2Score = 0
137+
138+ def player1Scored (self ):
139+ '''This method adds one to the score for player 1'''
140+ self .player1Score += 1
141+
142+ def player2Scored (self ):
143+ '''This method adds one to the score for player 1'''
144+ self .player2Score += 1
145+
146+ def winner (self ):
147+ '''There is a winner when one player reaches 3 points.
148+ This method returns 0 if there is no winner yet, 1 if player 1 has
149+ won, or 2 if player 2 has won.'''
150+ if self .player1Score == 5 :
151+ return 1
152+ elif self .player2Score == 5 :
153+ return 2
154+ else :
155+ return 0
156+
157+ def update (self ):
158+ '''This method will be called automatically to display
159+ the current score at the top of the game window.'''
160+ message = "Player 1: " + str (self .player1Score ) + \
161+ " vs. Player 2: " + str (self .player2Score )
162+ self .image = self .font .render (message , 1 , (0 , 0 , 0 ))
163+ self .rect = self .image .get_rect ()
164+ self .rect .center = (320 , 15 )
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