created ball and bouncing off paddles

pypong/__main__.py

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+"""
+Launch script
+"""
+
+from pypong.game_files.game import main as game_main
+
+if __name__ == '__main__':
+    game_main()

pypong/game_files/game.py

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+import math
+import pygame
+import pypong
+import random
+import time
+
+SCREEN_SIZE = (800, 600)  # Size of the game window
+GAME_FPS = 60
+GAME_COLOR = (255, 255, 255)  # Color of all the sprites on screen
+PADDLE_SIZE = (20, 200)
+PADDLE_SPEED = 10
+BALL_SIZE = 30
+BALL_SPEED = 7
+
+
+class Paddle(pygame.sprite.Sprite):
+    def __init__(self):
+        super().__init__()
+
+        self.moving_down = False
+        self.moving_up = False
+
+        self.image = pygame.Surface(PADDLE_SIZE)
+        self.image.fill(GAME_COLOR)
+        self.rect = self.image.get_rect()
+
+    def update(self):
+        if self.moving_down:
+            self.rect.y += PADDLE_SPEED
+        if self.moving_up:
+            self.rect.y -= PADDLE_SPEED
+
+        if self.rect.top < 0:
+            self.rect.top = 0
+        if self.rect.bottom > SCREEN_SIZE[1]:
+            self.rect.bottom = SCREEN_SIZE[1]
+
+
+class Ball(pygame.sprite.Sprite):
+    def __init__(self):
+        super().__init__()
+
+        # Booleans to randomize direction of the ball upon spawning
+        initial_x_vel_negative = bool(random.getrandbits(1))
+        initial_y_vel_negative = bool(random.getrandbits(1))
+
+        self.x_vel = BALL_SPEED
+        self.y_vel = BALL_SPEED
+        if initial_x_vel_negative:  # Flip ball speed based on random bools
+            self.x_vel = -BALL_SPEED
+        if initial_y_vel_negative:
+            self.y_vel = -BALL_SPEED
+
+        self.image = pygame.Surface((BALL_SIZE, BALL_SIZE), pygame.SRCALPHA)
+        pygame.draw.circle(self.image, GAME_COLOR, (BALL_SIZE / 2, BALL_SIZE / 2), math.floor(BALL_SIZE / 2.0))
+        self.rect = self.image.get_rect()
+
+    def update(self):
+        self.rect.centerx += self.x_vel
+        self.rect.centery += self.y_vel
+
+        # Always bounce ball if it hits the top or bottom of the screen
+        if self.rect.top <= 0:
+            self.rect.top = 0
+            self.y_vel *= -1
+        if self.rect.bottom >= SCREEN_SIZE[1]:
+            self.rect.bottom = SCREEN_SIZE[1]
+            self.y_vel *= -1
+
+
+def game(is_host=True):
+    """
+    Starts the game.
+    """
+
+    pygame.init()
+
+    window = pygame.display.set_mode(SCREEN_SIZE)
+    surface = pygame.Surface(SCREEN_SIZE)
+
+    # Set title of window
+    pygame.display.set_caption('PyPong {0}'.format(pypong.__version__))
+
+    # Add an icon to the pygame window.
+    # icon = pygame.image.load('NO ICON YET, WIP').convert_alpha()
+    # pygame.display.set_icon(icon)
+
+    clock = pygame.time.Clock()
+
+    # Default game state when the game first starts.
+    running = True
+
+    # A group of all the sprites on screen. Used to update all sprites at once
+    all_sprites = pygame.sprite.Group()
+
+    # Functions used for drawing the game screen #
+
+    def draw():
+        """
+        Draws the main pygame display.
+        """
+
+        # Draws all the sprites on a black background
+        all_sprites.update()
+        surface.fill((0, 0, 0))
+        all_sprites.draw(surface)
+        window.blit(surface, surface.get_rect())
+
+        # Update the entire display
+        pygame.display.flip()
+
+    def keyboard_movement(paddle):
+        for keyboard_event in pygame.event.get():
+            if keyboard_event.type == pygame.KEYDOWN:
+                if keyboard_event.key == pygame.K_DOWN:
+                    paddle.moving_down = True
+                if keyboard_event.key == pygame.K_UP:
+                    paddle.moving_up = True
+            if keyboard_event.type == pygame.KEYUP:
+                if keyboard_event.key == pygame.K_DOWN:
+                    paddle.moving_down = False
+                if keyboard_event.key == pygame.K_UP:
+                    paddle.moving_up = False
+
+    # Create the two paddles
+    host_player = Paddle()
+    client_player = Paddle()
+    host_player.rect.centery = SCREEN_SIZE[1] / 2
+    client_player.rect.centery = SCREEN_SIZE[1] / 2
+    client_player.rect.right = SCREEN_SIZE[0]  # Move client paddle to other side
+    all_sprites.add(host_player, client_player)
+    paddle_sprites = pygame.sprite.Group()
+    paddle_sprites.add(host_player, client_player)
+
+    # Create the ball
+    ball = Ball()
+    ball.rect.centerx = SCREEN_SIZE[0] / 2
+    # The ball is moved up or down a random amount
+    ball.rect.centery = (SCREEN_SIZE[1] / 2) + random.randint(-25, 25)
+    all_sprites.add(ball)
+
+    # Create the scoreboard
+    # host_score = 0
+    # client_score = 0
+
+    draw()
+    time.sleep(1)
+
+    while running:
+        clock.tick(GAME_FPS)
+        draw()
+
+        if is_host:
+            keyboard_movement(host_player)
+        else:
+            keyboard_movement(client_player)
+
+        # Bounce ball off of paddles
+        if pygame.sprite.spritecollideany(ball, paddle_sprites):
+            ball.x_vel *= -1
+
+
+def main():
+    """
+    Calls the game() function to start the game.
+    """
+    game()
+
+    pygame.quit()