如何在pygame中检测两个矩形物体或图像之间的碰撞

Question

我正在做一个游戏，在这个游戏中，玩家必须用一个碗来接住掉落的物品。我有一些列表中项目的图像和一个用来捕捉项目的碗的图像。这些项目会持续下降，如果它们到达边界(底部边缘)，则会重置到屏幕顶部。我完成了这个逻辑，允许物品落下，但我不知道如何检测碗和物品之间的碰撞。

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, 0)
red = (255, 0, 0)
blue = (0, 255, 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, (x, 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, display_width), -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()

Answer 1

使用pygame。Rectobjects和collectrect（）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):
    # [...]

如果你有图片。Surface对象)，的边框可以通过< code>get_rect()获得，其中曲面的位置必须由关键字参数设置，因为返回的矩形总是从(0，0)开始:< br >(请参见为什么我的碰撞测试不起作用以及为什么图像的矩形位置总是错误的(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（）将游戏的开始延迟一段时间。pygame.time.get_ticks（） 返回自调用 pygame.init（） 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, thing_y = things_cor[i]
            things(thing_x, thing_y, things_added[i])
        pygame.display.update()
        clock.tick(60)