碰撞检测在 pygame 中无法正常运行

Question

我正在处理我的第一个 pygame 项目，但似乎无法让碰撞检测正常工作，这是我到目前为止的情况，我不太确定问题出在哪里

import random
import sys
import pygame


pygame.init()
screen = pygame.display.set_mode((288, 512))
clock = pygame.time.Clock()
game_font = pygame.font.Font('freesansbold.ttf', 40)


def draw_bg():
    screen.blit(bg_surface, (0, bg_y_pos))
    screen.blit(bg_surface, (0, bg_y_pos + 512))


def create_hazzard():
    random_hazzard_pos = random.choice(hazzard_length)
    left_hazzard = hazzard_surface.get_rect(midright=(random_hazzard_pos, 520))
    right_hazzard = hazzard_surface.get_rect(midleft=(random_hazzard_pos + 75, 520))
    return right_hazzard, left_hazzard


def move_hazzards(hazzards):
    for hazzard in hazzards:
        hazzard.centery -= 2
    visible_hazzard = [hazzard for hazzard in hazzards if hazzard.top > -50]
    return visible_hazzard


def draw_hazzards(hazzards):
    for hazzard in hazzards:
        if hazzard.left >= 288:
            screen.blit(hazzard_surface, hazzard)
        else:
            flip_hazzard = pygame.transform.flip(hazzard_surface, True, False)
            screen.blit(flip_hazzard, hazzard)


def check_collision(hazzards):
    for hazzard in hazzards:
        if player_rect.colliderect(hazzard):
            death_sound.play()
            print('collision')
            return False
        else:
            return True



bg_y_pos = 0

player_x_pos = 144
player_y_pos = 256
player_x_change = 0


character_movement = 0
game_active = True
score = 0

player_surface = pygame.image.load('player.png').convert_alpha()
player_surface = pygame.transform.scale2x(player_surface)
player_rect = player_surface.get_rect(center=(player_x_pos, player_y_pos))
bg_surface = pygame.image.load('temp.png').convert()
hazzard_surface = pygame.image.load('temp_hazard.png')

death_sound = pygame.mixer.Sound('temp_hit.mp3')

hazzard_list = []
SPAWNHAZARD = pygame.USEREVENT
pygame.time.set_timer(SPAWNHAZARD, 1200)
hazzard_length = [200, 50, 100]

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player_x_change -= 2
            if event.key == pygame.K_RIGHT:
                player_x_change += 2

        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or pygame.K_RIGHT:
                player_x_change = 0

        if event.type == SPAWNHAZARD:
            hazzard_list.extend(create_hazzard())

    player_x_pos += player_x_change
    # scolling background
    bg_y_pos -= 2

    if bg_y_pos <= -512:
        bg_y_pos = 0

    if game_active:
        draw_bg()
        hazzard_list = move_hazzards(hazzard_list)
        draw_hazzards(hazzard_list)
        player_rect.centerx += player_x_change
        screen.blit(player_surface, player_rect)
        check_collision(hazzard_list)

    pygame.display.update()
    clock.tick(120)

只有right_hazzard检测到碰撞，left_hazzard没有。如果我 return left_hazzard 在 right_hazzard 之前，那么 left_hazzard 可以检测到碰撞但不能 right_hazzard.

Answer 1

这里的问题与您可能已经发现的 check_collision 函数的逻辑有关。具体来说，问题是该函数在完全到达循环末尾之前 return 正在计算结果。

我猜您正在寻找的逻辑是，如果 'left_hazard' 或 'right_hazard' 有问题，则 return 错误，但将其扩展为任意长的列表。因为它实际上是一个很长的 'or' 语句。当检测到碰撞时，您仍然可以 return 'False'，但是在循环完成之前不要 return true。

所以代码看起来更像这样：

def check_collision(hazzards):
  for hazzard in hazzards:
    if player_rect.colliderect(hazzard):
        death_sound.play()
        print('collision')
        return False
  # Outside the loop above
  return True

注意：我假设函数 player_rect.colliderect 和 create_hazzard 的输出没有问题，因为我不确定前者是如何实现的。因此，虽然上述问题确实是一个有效的错误，但如果它不能解决您的问题，我会更仔细地查看 player_rect.colliderect 函数并检查传递给它的正确输入。

碰撞检测在 pygame 中无法正常运行

collision detection not functioning properly in pygame

python

pygame

collision-detection