Python Fruit Ninja Game Tutorial Using Pygame

This article demonstrates how to build a simple Fruit Ninja‑style game in Python using the pygame library.

It begins by importing required modules and configuring the display window, colors, fonts, and background image:

import pygame, sys, os, random

WIDTH = 800
HEIGHT = 500
FPS = 15
pygame.init()
pygame.display.set_caption('水果忍者')
gameDisplay = pygame.display.set_mode((WIDTH, HEIGHT))
clock = pygame.time.Clock()
WHITE = (255,255,255)
BLACK = (0,0,0)
RED   = (255,0,0)
GREEN = (0,255,0)
BLUE  = (0,0,255)
background = pygame.image.load('背景.jpg')
font = pygame.font.Font(os.path.join(os.getcwd(),'comic.ttf'),42)
score_text = font.render('Score : '+str(score),True,WHITE)

Functions are defined to generate random fruit positions, draw text, display player lives, and show the game‑over screen, each illustrated with full source code:

def generate_random_fruits(fruit):
    fruit_path = "images/"+fruit+".png"
    data[fruit] = {
        'img': pygame.image.load(fruit_path),
        'x': random.randint(100,500),
        'y': 800,
        'speed_x': random.randint(-10,10),
        'speed_y': random.randint(-80,-60),
        'throw': False,
        't': 0,
        'hit': False
    }

def draw_text(display, text, size, x, y):
    font_name = pygame.font.match_font('comic.ttf')
    font = pygame.font.Font(font_name, size)
    text_surface = font.render(text, True, WHITE)
    text_rect = text_surface.get_rect()
    text_rect.midtop = (x, y)
    display.blit(text_surface, text_rect)

def draw_lives(display, x, y, lives, image):
    for i in range(lives):
        img = pygame.image.load(image)
        img_rect = img.get_rect()
        img_rect.x = int(x + 35 * i)
        img_rect.y = y
        display.blit(img, img_rect)

def show_gameover_screen():
    gameDisplay.blit(background, (0,0))
    draw_text(gameDisplay, "FRUIT NINJA!", 90, WIDTH/2, HEIGHT/4)
    draw_text(gameDisplay, "Score : "+str(score), 50, WIDTH/2, HEIGHT/2)
    draw_text(gameDisplay, "Press a key to begin!", 64, WIDTH/2, HEIGHT*3/4)
    pygame.display.flip()
    waiting = True
    while waiting:
        clock.tick(FPS)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
            if event.type == pygame.KEYUP:
                waiting = False

The main game loop manages the game state, processes input events, updates fruit positions, detects cuts and bomb collisions, updates the score, and renders all elements at a fixed frame rate:

first_round = True
game_over = True
game_running = True
while game_running:
    if game_over:
        if first_round:
            show_gameover_screen()
            first_round = False
        game_over = False
        player_lives = 3
        draw_lives(gameDisplay, 690, 5, player_lives, 'images/red_lives.png')
        score = 0
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_running = False
    # Update fruit positions, handle collisions, draw everything
    pygame.display.update()
    clock.tick(FPS)
pygame.quit()

Additional details such as handling explosions, updating life icons, and restarting the game after a game‑over are also covered, providing a complete, runnable example for beginners interested in game development with Python.