最高分与安全重启
本课属于 Coddy Pygame 学习旅程的“游戏规则”单元。第 30 课，共 30 课。
游戏结束画面会显示最高分，按下空格键即可开始新游戏。best 在循环开始前只设置一次，且位于 reset() 外面，因此开始新游戏时会保留它。
现在，在游戏结束画面中，空格键还有第三个用途：
elif pygame.time.get_ticks() - over_time > 500:
reset()
state = "play"空格键是跳跃键，因此玩家在撞毁时往往正按着它。如果不等待，游戏会在玩家看到结果前就重新开始。用 over_time 记录撞毁的时间，并且只在 500 ms 后才接受玩家在游戏结束画面中按下的空格键。
挑战
困难显示最高分，并安全地重新开始。
- 在
state = "menu"之后，设置best = 0和over_time = 0。发生碰撞时，将best设为max(best, score)，并将over_time设为当前时间。 - 游戏结束时显示
Game over、Best: 00120和Press Space to play again。 - 在游戏结束界面，按下 Space 会调用
reset()并开始游戏，但必须在碰撞发生 500 ms 后才能这样做。
按“开始”并让角色碰撞：你会看到最高分，按下 Space 就能重新开始。然后点击“检查”。
亲手试试
import random
import pygame
pygame.init()
screen = pygame.display.set_mode((640, 320))
pygame.display.set_caption("Sky Runner")
clock = pygame.time.Clock()
font = pygame.font.Font("assets/fonts/pixel.ttf", 32)
big_font = pygame.font.Font("assets/fonts/pixel.ttf", 48)
INK = (40, 50, 80)
SKY = (140, 200, 240)
GROUND = (90, 160, 80)
GROUND_Y = 260
GRAVITY = 1
SPAWN = pygame.USEREVENT + 1
POINT = pygame.USEREVENT + 2
class Runner(pygame.sprite.Sprite):
def __init__(self):
super().__init__()
self.frames = [
pygame.image.load("assets/images/player.png").convert_alpha(),
pygame.image.load("assets/images/player_walk.png").convert_alpha(),
]
self.image = self.frames[0]
self.step = 0
self.rect = self.image.get_rect(midbottom=(100, GROUND_Y))
self.vy = 0
def jump(self):
if self.rect.bottom == GROUND_Y:
self.vy = -16
def update(self):
self.vy += GRAVITY
self.rect.y += self.vy
if self.rect.bottom >= GROUND_Y:
self.rect.bottom = GROUND_Y
self.vy = 0
if self.rect.bottom == GROUND_Y:
self.step += 1
self.image = self.frames[self.step // 8 % 2]
else:
self.image = self.frames[1]
class Obstacle(pygame.sprite.Sprite):
def __init__(self):
super().__init__()
self.image = random.choice(obstacle_images)
self.rect = self.image.get_rect(midbottom=(664, GROUND_Y))
def update(self):
self.rect.x -= speed
if self.rect.right < 0:
self.kill()
obstacle_images = [
pygame.image.load("assets/images/spike_ball.png").convert_alpha(),
pygame.image.load("assets/images/blob.png").convert_alpha(),
]
def reset():
global runner, obstacles, speed, score
runner = Runner()
obstacles = pygame.sprite.Group()
speed = 6
score = 0
pygame.time.set_timer(SPAWN, 1500)
pygame.time.set_timer(POINT, 100)
def show(text, text_font, y):
picture = text_font.render(text, True, INK)
screen.blit(picture, picture.get_rect(center=(320, y)))
reset()
state = "menu"
running = True
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
if event.type == pygame.KEYDOWN and event.key in (pygame.K_SPACE, pygame.K_UP):
if state == "play":
runner.jump()
elif state == "menu":
reset()
state = "play"
if event.type == SPAWN and state == "play":
obstacles.add(Obstacle())
pygame.time.set_timer(SPAWN, random.randint(1000, 2000))
if event.type == POINT and state == "play":
score += 1
if state == "play":
speed = min(14, 6 + score // 100)
runner.update()
obstacles.update()
if pygame.sprite.spritecollideany(runner, obstacles, pygame.sprite.collide_mask):
state = "over"
screen.fill(SKY)
pygame.draw.rect(screen, GROUND, (0, GROUND_Y, 640, 60))
screen.blit(runner.image, runner.rect)
obstacles.draw(screen)
if state == "menu":
show("Sky Runner", big_font, 110)
show("Press Space to start", font, 170)
else:
score_text = font.render(f"{score:05}", True, INK)
screen.blit(score_text, score_text.get_rect(topright=(630, 10)))
if state == "over":
message = font.render("Game over", True, (40, 50, 80))
screen.blit(message, message.get_rect(center=(320, 140)))
pygame.display.flip()
clock.tick(60)
pygame.quit()
自我测试这节课包含一个小测验。开始学习即可作答，并记录你的进度。
游戏规则中的所有课
自己练习： Pygame 在线编辑器