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import pygame
import random

# Initialize Pygame
pygame.init()

# Constants
SCREEN_WIDTH = 300
SCREEN_HEIGHT = 600
BLOCK_SIZE = 30
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)

# Tetris shapes
SHAPES = [
    [[1, 1, 1, 1]],
    [[1, 1, 1], [1]],
    [[1, 1, 1], [0, 0, 1]],
    [[1, 1, 1], [0, 1]],
    [[1, 1], [1, 1]],
    [[0, 1, 1], [1, 1]],
    [[1, 1, 0], [0, 1, 1]]
]

# Initialize game variables
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
clock = pygame.time.Clock()

def draw_block(x, y):
    pygame.draw.rect(screen, WHITE, (x * BLOCK_SIZE, y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE))
    pygame.draw.rect(screen, BLACK, (x * BLOCK_SIZE, y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE), 2)

def draw_board(board):
    for y, row in enumerate(board):
        for x, value in enumerate(row):
            if value:
                draw_block(x, y)

def generate_shape():
    return random.choice(SHAPES)

def can_move(board, shape, offset):
    for y, row in enumerate(shape):
        for x, value in enumerate(row):
            if value:
                if x + offset[0] < 0 or x + offset[0] >= len(board[0]) or y + offset[1] >= len(board) or board[y + offset[1]][x + offset[0]]:
                    return False
    return True

def merge_shape(board, shape, position):
    for y, row in enumerate(shape):
        for x, value in enumerate(row):
            if value:
                board[y + position[1]][x + position[0]] = 1

def clear_lines(board):
    lines_to_clear = [i for i, row in enumerate(board) if all(row)]
    for line in lines_to_clear:
        del board[line]
        board.insert(0, [0] * len(board[0]))

def main():
    # Initialize game variables
    board = [[0] * (SCREEN_WIDTH // BLOCK_SIZE) for _ in range(SCREEN_HEIGHT // BLOCK_SIZE)]
    current_shape = generate_shape()
    current_position = [5, 0]

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT and can_move(board, current_shape, [current_position[0] - 1, current_position[1]]):
                    current_position[0] -= 1
                elif event.key == pygame.K_RIGHT and can_move(board, current_shape, [current_position[0] + 1, current_position[1]]):
                    current_position[0] += 1
                elif event.key == pygame.K_DOWN and can_move(board, current_shape, [current_position[0], current_position[1] + 1]):
                    current_position[1] += 1

        # Move the shape down
        if can_move(board, current_shape, [current_position[0], current_position[1] + 1]):
            current_position[1] += 1
        else:
            merge_shape(board, current_shape, current_position)
            clear_lines(board)
            current_shape = generate_shape()
            current_position = [5, 0]

        # Draw everything
        screen.fill(BLACK)
        draw_board(board)
        for y, row in enumerate(current_shape):
            for x, value in enumerate(row):
                if value:
                    draw_block(x + current_position[0], y + current_position[1])

        pygame.display.update()
        clock.tick(5)  # Adjust the speed of the game

if __name__ == "__main__":
    main()
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