问题描述
我正在做一个游戏，其中玩家必须使用碗抓落的物品。我在列表中有一些项目的图像，还有一个用来捕获项目的碗的图像。这些项目持续下降并在到达边界（底部边缘）时重置到屏幕顶部。我完成了使物品掉落的逻辑，但是我不知道如何检测碗和物品之间是否发生碰撞。
我的代码：
import math
import pygame
import random
pygame.init()
display_width = 800
display_height = 600
game_display = pygame.display.set_mode((display_width,display_height))
clock = pygame.time.Clock()
pygame.display.set_caption("Catch the Ball")
white = (255,255,255)
black = (0,0)
red = (255,0)
blue = (0,0)
player_img = pygame.image.load("Images/soup.png")
thing_imgs = [pygame.image.load('Images/muffin.png'),pygame.image.load('Images/dessert.png'),pygame.image.load('Images/cheese.png'),pygame.image.load('Images/fruit.png')]
def player(x,y):
game_display.blit(player_img,(x,y))
def things(x,y,img):
game_display.blit(img,y))
def game_loop():
running = True
x = display_width * 0.45
y = display_height * 0.8
x_change = 0
player_width = 64
player_height = 64
things_cor = [[random.randint(0,display_width),32]]
things_added = [random.choice(thing_imgs)]
thing_height = 32
thing_width = 32
y_change = 5
caught = 0
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
x_change = -5
if event.key == pygame.K_RIGHT:
x_change = 5
if event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
x_change = 0
game_display.fill(white)
player(x,y)
x += x_change
for i in range(len(things_cor)):
thing_x,thing_y = things_cor[i]
things(thing_x,thing_y,things_added[i])
for i in range(len(things_cor)):
things_cor[i][1] += y_change
if things_cor[i][1] > display_height:
things_cor[i][1] = random.randint(-2000,-1000)
things_cor[i][0] = random.randint(0,display_width)
things_added[i] = random.choice(thing_imgs)
things_added.append(random.choice(thing_imgs))
if len(things_added) < 6:
things_cor.append(
[random.randint(0,-10])
if x < 0:
x = 0
elif x > display_width - player_width:
x = display_width - player_width
clock.tick(60)
pygame.display.update()
game_loop()
解决方法
使用pygame.Rect对象和colliderect()检测2个对象或2个图像的边界矩形之间的碰撞：
rect1 = pygame.Rect(x1,y1,w1,h1)
rect2 = pygame.Rect(x2,y2,w2,h2)
if rect1.colliderect(rect2):
# [...]
如果您必须拍摄图像（pygame.Surface个对象），则可以通过get_rect()来获取的边界矩形，其中 Surface 的位置必须由关键字参数，因为返回的矩形始终以（0，0）开头：
（请参阅Why is my collision test not working and why is the position of the rectangle of the image always wrong (0,0)?）
def game_loop():
# [...]
while running:
# [...]
player_rect = player_img.get_rect(topleft = (x,y))
for i in range(len(things_cor)):
thing_rect = things_added[i].get_rect(topleft = things_cor[i])
if player_rect.colliderect(thing_rect):
print("hit")
player(x,y)
x += x_change
for i in range(len(things_cor)):
thing_x,thing_y = things_cor[i]
things(thing_x,thing_y,things_added[i])
使用pygame.time.get_ticks()将游戏开始延迟一定时间。 pygame.time.get_ticks()返回自pygame.init()被调用以来的毫秒数。例如：
def game_loop():
# [...]
while running:
passed_time = pygame.time.get_ticks() # passed time in milliseconds
start_time = 100 * 1000 # start time in milliseconds (100 seconds)
# [...]
# move player
if passed_time >= start_time:
x += x_change
if x < 0:
x = 0
elif x > display_width - player_width:
x = display_width - player_width
# move things
if passed_time >= start_time:
for i in range(len(things_cor)):
things_cor[i][1] += y_change
if things_cor[i][1] > display_height:
things_cor[i][1] = random.randint(-2000,-1000)
things_cor[i][0] = random.randint(0,display_width)
things_added[i] = random.choice(thing_imgs)
things_added.append(random.choice(thing_imgs))
if len(things_added) < 6:
things_cor.append(
[random.randint(0,display_width),-10])
# draw scene and update dispaly
game_display.fill(white)
player(x,y)
for i in range(len(things_cor)):
thing_x,things_added[i])
pygame.display.update()
clock.tick(60)