python - 油罐没有出现

Question

我正在使用模块 Pygame zero 在 Python 3.7 中编写游戏。游戏名称为“路怒”。我试图让燃料罐出现在路上以收集它们，但由于某种原因它们没有出现。我试图打印出控制台中有多少个燃料罐，但它甚至没有创建演员。它没有出现任何错误消息，只是没有创建燃料罐。

# Setting the window on center of the screen

import pygame
WIDTH = 720
HEIGHT = 710
pygame.display.set_mode((WIDTH, HEIGHT))

# Importing
from pgzrun import go
from random import choice
WIDTH = 720
HEIGHT = 710

# Variables
TITLE = 'Road Rage'
mode = 'menu'
CAR_IMAGES = ['blue_car', 'pink_car', 'red_car']
road = Actor('road', (WIDTH - 70, HEIGHT), anchor=('right', 'bottom'))
player = Actor('main_car', (WIDTH / 2, HEIGHT))
random_cars = [Actor('red_car', (choice([WIDTH / 2 - 200, WIDTH / 2, WIDTH / 2 + 200]), -250))]
delay = 0.01
fuel_level = 1000
fuel_cans = [Actor('fuel_bag', (choice([WIDTH/2-200, WIDTH/2, WIDTH/2+200]), -250))]


def draw():
    global delay
    if mode is 'game':
        screen.fill((31, 201, 0))
        road.draw()
        player.draw()
        for car in random_cars:
            car.draw()
        for fuel_bag in fuel_cans:
            fuel_bag.draw()
        screen.draw.text(str(fuel_level), (20, 20))
    elif mode is 'menu':
        screen.fill((4, 173, 238))
        player.draw()
        if player.y > WIDTH / 2:
            clock.schedule(up_one_px, delay)

        screen.draw.text('ROAD RAGE', center=(WIDTH / 2, 40), fontsize=100, fontname='font')
        screen.draw.text('EXPLORE THE TRUE ROAD RAGE AND DRIVE YOUR CAR AROUND THE CITY', center=(WIDTH / 2, 88), fontsize=16, fontname='font')
        screen.draw.text('PRESS SPACE TO START THE GAME!',
                         center=(WIDTH / 2, 150), fontsize=35, fontname='font')
        delay += 0.01

def update():
    global fuel_level, mode


    if mode is 'menu' and player.y < HEIGHT / 2:
        player.y = HEIGHT / 2
    if mode is 'game':
        fuel_level -= 1
        if fuel_level <= 0:
            mode = 'game over'
        for bag in fuel_cans:
            for car in random_cars:
                while bag.colliderect(car):
                    bag.x = choice([WIDTH/2-200, WIDTH/2, WIDTH/2+200])
        update_road()
        update_random_cars()
        player.y = HEIGHT / 2 + 200


def up_one_px():
    player.y -= 7


def update_road():
    road.y += 10
    if road.y >= HEIGHT + 600:
        road.y = HEIGHT


def new_random_car():
    random_cars.append(Actor(choice(CAR_IMAGES), (choice([WIDTH / 2 - 200, WIDTH / 2, WIDTH / 2 + 200]), -250)))


def new_fuel_bag():
    fuel_cans.append(Actor('fuel_bag', (choice([WIDTH/2-200, WIDTH/2, WIDTH/2+200]), -250)))

def update_random_cars():
    global mode
    if random_cars[-1].y >= 400:
        new_random_car()
    for car in random_cars:
        car.y += 10
        if car.colliderect(player) or fuel_level <= 0:
            mode = 'game over'
        elif car.y > WIDTH + 250:
            random_cars.remove(car)


def update_fuel_cans():
    global fuel_level
    if fuel_cans[-1].y >= 400:
        new_fuel_bag()
    for fuel_bag in fuel_cans:
        fuel_bag.y += 10
        if fuel_bag.colliderect(player):
            fuel_level += 200
        elif fuel_bag.y < WIDTH + 250:
            fuel_cans.remove(fuel_bag)


def on_key_down(key):
    global mode
    if mode is 'game':
        if key == keys.LEFT:
            if player.x == WIDTH / 2 or player.x == WIDTH / 2 + 200:
                player.x -= 200
        elif key == keys.RIGHT:
            if player.x == WIDTH / 2 - 200 or player.x == WIDTH / 2:
                player.x += 200
    elif mode is 'menu':
        if key is keys.SPACE:
            mode = 'game'

go()

标签： pythonpgzero

Answer 1

你错过了电话update_fuel_cans。来电update_fuel_cans更新：

def update():
    global fuel_level, mode

    if mode is 'menu' and player.y < HEIGHT / 2:
        player.y = HEIGHT / 2
    if mode is 'game':
        fuel_level -= 1
        if fuel_level <= 0:
            mode = 'game over'
        for bag in fuel_cans:
            for car in random_cars:
                while bag.colliderect(car):
                    bag.x = choice([WIDTH/2-200, WIDTH/2, WIDTH/2+200])
        update_road()
        update_random_cars()
        update_fuel_cans()                   # <--- this is missing
        player.y = HEIGHT / 2 + 200

问题是导致文件包被删除的情况：

elif fuel_bag.y < WIDTH + 250:
   fuel_cans.remove(fuel_bag)

条件总是true。因此，袋子立即被移除。

可能应该是：

elif fuel_bag.y >= WIDTH:
    fuel_cans.remove(fuel_bag)

如果玩家收集了所有的燃料袋，你根本不会创建任何新的燃料袋。fuel_cans我建议在列表为空时创建一个燃料袋：

def update_fuel_cans():
    global fuel_level

    if len(fuel_cans) < 1 or fuel_cans[-1].y >= 400:
        new_fuel_bag()

    for fuel_bag in fuel_cans[:]:
        fuel_bag.y += 10
        if fuel_bag.colliderect(player):
            fuel_level += 200
            fuel_cans.remove(fuel_bag)
        elif fuel_bag.y >= WIDTH:
            fuel_cans.remove(fuel_bag)