# Python Program Exhibit
---
### pip3 install pygame
---
### 1. Initialize every varibles
```python=
pygame.init()
screen = pygame.display.set_mode([640, 480])
# the ball's variables
ball_x = 50
ball_y = 50
ball_radius = 8
ball_color = [255, 0, 0]
ball_speed_x = 4
ball_speed_y = 5
ball_speed_boost = 1.1
# the paddle's variables
paddle1_x = 20
paddle1_y = 200
paddle2_x = 600
paddle2_y = 200
paddle_width = 8
paddle_height = 60
paddle_color_1 = [20, 180, 180]
paddle_color_2 = [20, 180, 180]
paddle_speed = 10
# the score's varible
myfont = pygame.font.SysFont("Arial", 15)
score1 = 0
score2 = 0
# allows milliseconds for holding the key
pygame.key.set_repeat(10, 10)
```
----
### 2. Start running the game
```python=
running = True
# game loop
while running:
for event in pygame.event.get():
```
----
##### (1) Check if the game quit
```python=
# check if you've exited the game
if event.type == pygame.QUIT:
running = False
```
----
##### (2) Check if pressing the keys
```python=
# check if you pressed down a key
if event.type == pygame.KEYDOWN:
# Press w key for paddle1 to go up
if event.key == pygame.K_w:
paddle1_y = paddle1_y - paddle_speed
if paddle1_y < 0:
paddle1_y = 0
# Press s key for paddle1 to go down
if event.key == pygame.K_s:
paddle1_y = paddle1_y + paddle_speed
if paddle1_y > screen.get_height() - paddle_height:
paddle1_y = screen.get_height() - paddle_height
# Press up key for paddle2 to go up
if event.key == pygame.K_UP:
paddle2_y = paddle2_y - paddle_speed
if paddle2_y < 0:
paddle2_y = 0
# Press down key for paddle2 to go down
if event.key == pygame.K_DOWN:
paddle2_y = paddle2_y + paddle_speed
if paddle2_y > screen.get_height() - paddle_height:
paddle2_y = screen.get_height() - paddle_height
```
----
##### (3) Set delay time for the game
```python=
# delay for 10 milliseconds
pygame.time.delay(10)
```
----
##### (4) Fill the background black
```python=
black = [0, 0, 0]
screen.fill(black)
```
----
##### (5) Let the ball move by its speed
```python=
# move the ball
ball_x = ball_x + ball_speed_x
ball_y = ball_y + ball_speed_y
```
----
##### (6) Check if the ball hit the edge
```python=
# check if the ball is off the bottom of the screen
if ball_y > screen.get_height() - ball_radius:
ball_speed_y = -ball_speed_y
# check if the ball hit the top of the screen
if ball_y < ball_radius:
ball_speed_y = -ball_speed_y
# check if the ball hit the right side of the screen
if ball_x > screen.get_width() - ball_radius:
if reset_ball("right"):
running = False
# check if the ball hit the left side of the screen
if ball_x < ball_radius:
if reset_ball("left"):
running = False
```
----
##### (7) Reset ball if hitting the edge on the left or right
```python=
def reset_ball(side):
# change ball's y speed to random
if ball_y >= 240:
ball_speed_y = -random.uniform(3, 7)
elif ball_y < 240:
ball_speed_y = random.uniform(3, 7)
# ball on the right side of the edge
if side == "right":
ball_speed_x = 4 + (score1 + score2) * 0.2
score1 += 1
ball_x = 80
# ball on the left side of the edge
elif side == "left":
ball_speed_x = -4 - (score1 + score2) * 0.2
score2 += 1
ball_x = 560
# end if any score equals 11
if score1 == 11 or score2 == 11:
return 1
else:
return 0
```
----
##### (8) Create rectangles around the ball and paddles
```python=
# create imaginary rectangles around ball and paddle
# circles are measured from the center, so have to subtract 1 radius from the x and y
ball_rect = pygame.Rect(ball_x - ball_radius, ball_y - ball_radius, ball_radius * 2, ball_radius * 2)
paddle1_rect = pygame.Rect(paddle1_x, paddle1_y, paddle_width, paddle_height)
paddle2_rect = pygame.Rect(paddle2_x, paddle2_y, paddle_width, paddle_height)
```
----
##### (9) Check if there's collision between the ball and paddles
```python=
if ball_rect.colliderect(paddle1_rect):
if ball_x + ball_radius >= paddle1_x:
ball_speed_x = -ball_speed_x * ball_speed_boost
else:
ball_speed_y = -ball_speed_y
paddle_color_1 = random_color()
ball_color = random_color()
if ball_rect.colliderect(paddle2_rect):
if ball_x - ball_radius <= paddle2_x:
ball_speed_x = -ball_speed_x * ball_speed_boost
else:
ball_speed_y = -ball_speed_y
paddle_color_2 = random_color()
ball_color = random_color()
```
----
##### (10) Draw every thing on the screen
###### pygame.draw.rect(canva, color, [x, y, width, height], line_width)
###### pygame.draw.circle(canva, color, [x, y], radius, line_width)
```python=
score1_label = myfont.render(str(score1), 1, pygame.color.THECOLORS['white'])
screen.blit(score1_label, (5, 10))
score2_label = myfont.render(str(score2), 1, pygame.color.THECOLORS['white'])
screen.blit(score2_label, (620, 10))
pygame.draw.circle(screen, ball_color, [int(ball_x), int(ball_y)], ball_radius, 0)
pygame.draw.rect(screen, paddle_color_1, [paddle1_x, paddle1_y, paddle_width, paddle_height], 0)
pygame.draw.rect(screen, paddle_color_2, [paddle2_x, paddle2_y, paddle_width, paddle_height], 0)
# update the entire display
pygame.display.update()
```
---
### 3. Game over
```python=
end = True
while end:
for event in pygame.event.get():
# check if you've exited the game
if event.type == pygame.QUIT:
end = False
```
----
##### Display end screen
```python=
myfont = pygame.font.SysFont("Arial", 20)
end_game_label = None
if score1 == 11:
end_game_label = myfont.render("Left side win!!", 1, pygame.color.THECOLORS['white'])
if score2 == 11:
end_game_label = myfont.render("Right side win!!", 1, pygame.color.THECOLORS['white'])
screen.blit(end_game_label, (240, 240))
pygame.display.update()
```
---
# Game Demo
----
----
---
# Full code
----
```python=
import pygame
import random
def random_color():
return [random.randint(50, 255), random.randint(50, 255), random.randint(50, 255)]
def reset_ball(side):
global ball_x
global ball_speed_x
global ball_speed_y
global score1
global score2
# change ball's y speed to random
if ball_y >= 240:
ball_speed_y = -random.uniform(3, 7)
elif ball_y < 240:
ball_speed_y = random.uniform(3, 7)
# ball on the right side of the edge
if side == "right":
ball_speed_x = 4 + (score1 + score2) * 0.2
score1 += 1
ball_x = 80
# ball on the left side of the edge
elif side == "left":
ball_speed_x = -4 - (score1 + score2) * 0.2
score2 += 1
ball_x = 560
# end if any score equals 11
if score1 == 11 or score2 == 11:
return 1
else:
return 0
pygame.init()
screen = pygame.display.set_mode([640, 480])
# the ball's variables
ball_x = 50
ball_y = 50
ball_radius = 8
ball_color = [255, 0, 0]
ball_speed_x = 4
ball_speed_y = 5
ball_speed_boost = 1.1
# the paddle's variables
paddle1_x = 20
paddle1_y = 200
paddle2_x = 600
paddle2_y = 200
paddle_width = 8
paddle_height = 60
paddle_color_1 = [20, 180, 180]
paddle_color_2 = [20, 180, 180]
paddle_speed = 5
pygame.font.init()
myfont = pygame.font.SysFont("Arial", 15)
score1 = 0
score2 = 0
# allows milliseconds for holding the key
pygame.key.set_repeat(10, 10)
running = True
# game loop
while running:
for event in pygame.event.get():
# check if you've exited the game
if event.type == pygame.QUIT:
running = False
# check if you pressed a key
if event.type == pygame.KEYDOWN:
# Press w key for paddle1 to go up
if event.key == pygame.K_w:
paddle1_y = paddle1_y - paddle_speed
if paddle1_y < 0:
paddle1_y = 0
# Press s key for paddle1 to go down
if event.key == pygame.K_s:
paddle1_y = paddle1_y + paddle_speed
if paddle1_y > screen.get_height() - paddle_height:
paddle1_y = screen.get_height() - paddle_height
# Press up key for paddle2 to go up
if event.key == pygame.K_UP:
paddle2_y = paddle2_y - paddle_speed
if paddle2_y < 0:
paddle2_y = 0
# Press down key for paddle2 to go down
if event.key == pygame.K_DOWN:
paddle2_y = paddle2_y + paddle_speed
if paddle2_y > screen.get_height() - paddle_height:
paddle2_y = screen.get_height() - paddle_height
# delay for 10 milliseconds
pygame.time.delay(10)
# make the screen completely black
black = [0, 0, 0]
screen.fill(black)
# move the ball
ball_x = ball_x + ball_speed_x
ball_y = ball_y + ball_speed_y
# check if the ball is off the bottom of the screen
if ball_y > screen.get_height() - ball_radius:
ball_speed_y = -ball_speed_y
# check if the ball hit the top of the screen
if ball_y < ball_radius:
ball_speed_y = -ball_speed_y
# check if the ball hit the right side of the screen
if ball_x > screen.get_width() - ball_radius:
if reset_ball("right"):
running = False
# check if the ball hit the left side of the screen
if ball_x < ball_radius:
if reset_ball("left"):
running = False
# create imaginary rectangles around ball and paddle
# circles are measured from the center, so have to subtract 1 radius from the x and y
ball_rect = pygame.Rect(ball_x - ball_radius, ball_y - ball_radius, ball_radius * 2, ball_radius * 2)
paddle1_rect = pygame.Rect(paddle1_x, paddle1_y, paddle_width, paddle_height)
paddle2_rect = pygame.Rect(paddle2_x, paddle2_y, paddle_width, paddle_height)
if ball_rect.colliderect(paddle1_rect):
if ball_x + ball_radius >= paddle1_x:
ball_speed_x = -ball_speed_x * ball_speed_boost
else:
ball_speed_y = -ball_speed_y
paddle_color_1 = random_color()
ball_color = random_color()
if ball_rect.colliderect(paddle2_rect):
if ball_x - ball_radius <= paddle2_x:
ball_speed_x = -ball_speed_x * ball_speed_boost
else:
ball_speed_y = -ball_speed_y
paddle_color_2 = random_color()
ball_color = random_color()
# draw everything on the screen
score1_label = myfont.render(str(score1), 1, pygame.color.THECOLORS['white'])
screen.blit(score1_label, (5, 10))
score2_label = myfont.render(str(score2), 1, pygame.color.THECOLORS['white'])
screen.blit(score2_label, (620, 10))
pygame.draw.circle(screen, ball_color, [int(ball_x), int(ball_y)], ball_radius, 0)
pygame.draw.rect(screen, paddle_color_1, [paddle1_x, paddle1_y, paddle_width, paddle_height], 0)
pygame.draw.rect(screen, paddle_color_2, [paddle2_x, paddle2_y, paddle_width, paddle_height], 0)
# update the entire display
pygame.display.update()
end = True
while end:
for event in pygame.event.get():
# check if you've exited the game
if event.type == pygame.QUIT:
end = False
end_game_label = None
myfont = pygame.font.SysFont("Arial", 20)
if score1 == 11:
end_game_label = myfont.render("Left side win!!", 1, pygame.color.THECOLORS['white'])
if score2 == 11:
end_game_label = myfont.render("Right side win!!", 1, pygame.color.THECOLORS['white'])
screen.blit(end_game_label, (240, 240))
pygame.display.update()
```
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