为什么即使没有碰撞或没有与地板接触，我的代码也会不断打印 1？

Question

出于某种原因，我的代码正在打印 1，即使它没有与任何其他球或地板发生碰撞。我正在使用 sys、pygame.locals 和 pygame 作为我的主要库，并且没有任何错误出现。

代码：

pygame.init()

screen = pygame.display.set_mode((1000, 500))
green = (0, 255, 0)
circles = []
gravity = 1

def mainPhysics():
    for circle_pos in circles:
        circle_pos[1] += gravity
        if circle_pos[1] > 495:
            boundaries = circle_pos[1] - 495
            circle_pos[1] -= boundaries
        if circle_pos[0] < 0:
            boundaries2 = circle_pos[0]
            circle_pos[0] += boundaries2
        if circle_pos[0] > 995:
            boundaries3 = circle_pos[0] - 995
            circle_pos[0] - boundaries3
        circle_rect = pygame.draw.circle(screen, green, circle_pos, 5)

        collide = circle_rect.collidepoint(circle_pos)
        print('1') if collide else print('0')



def input():
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

        if event.type == pygame.MOUSEBUTTONDOWN:
            circles.append(list(event.pos))
        if event.type == pygame.MOUSEBUTTONDOWN and pygame.MOUSEMOTION:
            circles.append(list(event.pos))

clock = pygame.time.Clock()
while True:
    screen.fill((15, 15, 15))

    input()
    mouse_pos = pygame.mouse.get_pos()

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

Answer 1

对于碰撞检测，您需要 2 个对象。遍历嵌套循环中的圆圈。要检测 2 个圆圈之间的碰撞，请参阅 , or How do I detect collision in pygame?:

for i, circle_pos_1 in enumerate(circles):
    for circle_pos_2 in circles[i+1:]:
        dx = circle_pos_2[0] - circle_pos_1[0]  
        dy = circle_pos_2[1] - circle_pos_1[1]
        if dx*dx + dy*dy < 5*5:
            # [...]

最小示例：

import pygame
pygame.init()

screen = pygame.display.set_mode((1000, 500))
green = (0, 255, 0)
circles = []
gravity = 1

def input():
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        if event.type == pygame.MOUSEBUTTONDOWN:
            circles.append(list(event.pos))

count = 0
clock = pygame.time.Clock()
while True:
    screen.fill((15, 15, 15))

    input()
    mouse_pos = pygame.mouse.get_pos()

    for circle_pos in circles:
        circle_pos[1] += gravity
        if circle_pos[1] > 495:
            boundaries = circle_pos[1] - 495
            circle_pos[1] -= boundaries
        if circle_pos[0] < 0:
            boundaries2 = circle_pos[0]
            circle_pos[0] += boundaries2
        if circle_pos[0] > 995:
            boundaries3 = circle_pos[0] - 995
            circle_pos[0] - boundaries3

    for i, circle_pos_1 in enumerate(circles):
        for circle_pos_2 in circles[i+1:]:
            dx = circle_pos_2[0] - circle_pos_1[0]  
            dy = circle_pos_2[1] - circle_pos_1[1]
            if dx*dx + dy*dy < 5*5:
                count += 1 
                print(f"hit: {count}")           

    for circle_pos in circles:
        pygame.draw.circle(screen, green, circle_pos, 5)

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

为什么即使没有碰撞或没有与地板接触，我的代码也会不断打印 1？

Why is my code constantly printing 1 even if there is no collision or has not had contact with the floor?

python

pygame

collision-detection