我想知道在足球比赛中，在多边形和圆形之间的pygame中碰撞检测如何工作。我想做的是使球朝汽车撞入的方向移动。请有人修正我的代码，我很卡住！！如果运行以下代码，则两辆汽车将移动，但如果两车撞上球，则什么也不会发生，并且没有错误消息（我尝试使之运行的第26行）。对于初学者，我只希望它打印（“ Hello”）。如果有人可以提供帮助，我将不胜感激。 谢谢
import pygame
from pygame.math import Vector2
pygame.init()
screen = pygame.display.set_mode((1150, 800))
redx = 50
redy = 30
bluex = 100
bluey = 30
clock = pygame.time.Clock()
BLUECAR_ORIGINAL = pygame.Surface((bluex, bluey), pygame.SRCALPHA)
pygame.draw.polygon(
BLUECAR_ORIGINAL, (0, 0, 255), [(0, 30), (50, 20), (50, 10), (0, 0)])
bluecar = BLUECAR_ORIGINAL
REDCAR_ORIGINAL = pygame.Surface((redx,redy), pygame.SRCALPHA)
pygame.draw.polygon(
REDCAR_ORIGINAL, (255, 0, 0), [(0, 0), (50, 10), (50, 20), (0, 30)])
redcar = REDCAR_ORIGINAL
def paddle_hit():
if pygame.sprite.collide_rect(ball, bluerect):
print("HI")
elif pygame.sprite.collide_rect(ball, redrect):
print("hello")
pos = Vector2(70, 70)
vel = Vector2(7, 0)
poss = Vector2(70,70)
vell = Vector2(7,0)
redrect = redcar.get_rect(center=pos)
redangle = 0
bluerect = bluecar.get_rect(center=pos)
blueangle = 0
ballx = 575
bally = 400
run = True
while run:
ball = pygame.draw.circle(screen, [0,0,0],[ballx,bally],30)
pygame.display.flip()
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
redangle += 5
vel.rotate_ip(-5)
redcar = pygame.transform.rotate(REDCAR_ORIGINAL, redangle)
redrect = redcar.get_rect(center=pos)
elif keys[pygame.K_RIGHT]:
redangle -= 5
vel.rotate_ip(5)
redcar = pygame.transform.rotate(REDCAR_ORIGINAL, redangle)
redrect = redcar.get_rect(center=pos)
if keys[pygame.K_a]:
blueangle += 5
vell.rotate_ip(-5)
bluecar = pygame.transform.rotate(BLUECAR_ORIGINAL, blueangle)
bluerect = bluecar.get_rect(center=pos)
elif keys[pygame.K_d]:
blueangle -= 5
vell.rotate_ip(5)
bluecar = pygame.transform.rotate(BLUECAR_ORIGINAL, blueangle)
bluerect = bluecar.get_rect(center=poss)
pos += vel
redrect.center = pos
poss += vell
bluerect.center = poss
bgImg = pygame.image.load("Football_pitch.png")
screen.blit(bgImg, (0,0))
screen.blit(redcar, redrect)
screen.blit(bluecar, bluerect)
pygame.display.flip()
clock.tick(60)
pygame.quit()
答案 0 :(得分：2)
您可以使用遮罩进行碰撞检测，并将球的速度设置为碰撞球员的速度。
为球，红色和蓝色汽车（当汽车旋转时，必须创建新的蒙版）创建pygame.mask.Mask个对象（使用pygame.mask.from_surface）。
在while循环中，计算汽车与球之间的偏移量，然后调用overlap方法以查看它们是否重叠。如果遮罩碰撞，它将返回碰撞点，否则返回None。因此，如果overlap不返回None，则可以将球的速度设置为球员的速度，并且球的移动方向相同。缩放速度矢量以将球踢出。
import pygame
from pygame.math import Vector2
pygame.init()
screen = pygame.display.set_mode((1150, 800))
clock = pygame.time.Clock()
# Images.
BG_IMG = pygame.Surface((1150, 800))
BG_IMG.fill((30, 120, 30))
BLUECAR_ORIGINAL = pygame.Surface((50, 30), pygame.SRCALPHA)
pygame.draw.polygon(
BLUECAR_ORIGINAL, (0, 0, 255), [(0, 30), (50, 20), (50, 10), (0, 0)])
bluecar = BLUECAR_ORIGINAL
REDCAR_ORIGINAL = pygame.Surface((50, 30), pygame.SRCALPHA)
pygame.draw.polygon(
REDCAR_ORIGINAL, (255, 0, 0), [(0, 0), (50, 10), (50, 20), (0, 30)])
redcar = REDCAR_ORIGINAL
BALL = pygame.Surface((30, 30), pygame.SRCALPHA)
pygame.draw.circle(BALL, [250,250,250], [15, 15], 15)
# Ball variables.
ball_pos = Vector2(575, 400)
ballrect = BALL.get_rect(center=ball_pos)
ball_vel = Vector2(0, 0)
# Car variables.
pos_red = Vector2(470, 370)
vel_red = Vector2(3, 0)
redrect = redcar.get_rect(center=pos_red)
redangle = 0
pos_blue = Vector2(70,70)
vel_blue = Vector2(3,0)
bluerect = bluecar.get_rect(center=pos_red)
blueangle = 0
# Masks.
mask_blue = pygame.mask.from_surface(bluecar)
mask_red = pygame.mask.from_surface(redcar)
mask_ball = pygame.mask.from_surface(BALL)
run = True
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
redangle += 5
vel_red.rotate_ip(-5)
redcar = pygame.transform.rotate(REDCAR_ORIGINAL, redangle)
redrect = redcar.get_rect(center=redrect.center)
# We need a new mask after the rotation.
mask_red = pygame.mask.from_surface(redcar)
elif keys[pygame.K_RIGHT]:
redangle -= 5
vel_red.rotate_ip(5)
redcar = pygame.transform.rotate(REDCAR_ORIGINAL, redangle)
redrect = redcar.get_rect(center=redrect.center)
mask_red = pygame.mask.from_surface(redcar)
if keys[pygame.K_a]:
blueangle += 5
vel_blue.rotate_ip(-5)
bluecar = pygame.transform.rotate(BLUECAR_ORIGINAL, blueangle)
bluerect = bluecar.get_rect(center=bluerect.center)
mask_blue = pygame.mask.from_surface(bluecar)
elif keys[pygame.K_d]:
blueangle -= 5
vel_blue.rotate_ip(5)
bluecar = pygame.transform.rotate(BLUECAR_ORIGINAL, blueangle)
bluerect = bluecar.get_rect(center=bluerect.center)
mask_blue = pygame.mask.from_surface(bluecar)
# Move the cars.
pos_red += vel_red
redrect.center = pos_red
pos_blue += vel_blue
bluerect.center = pos_blue
# Move the ball.
ball_vel *= .99 # Friction.
ball_pos += ball_vel
ballrect.center = ball_pos
# Red car collision.
# We need the offset between the redrect and the ballrect.
offset_red = redrect[0] - ballrect[0], redrect[1] - ballrect[1]
# Pass the offset to the `overlap` method. If the masks collide,
# overlap will return a single point, otherwise `None`.
overlap_red = mask_ball.overlap(mask_red, offset_red)
# Blue car collision.
offset_blue = bluerect[0] - ballrect[0], bluerect[1] - ballrect[1]
overlap_blue = mask_ball.overlap(mask_blue, offset_blue)
if overlap_red and overlap_blue: # Both collide with the ball.
# Not sure what should happen here.
ball_vel = vel_red + vel_blue * 1.4
elif overlap_red: # Red collides with the ball.
ball_vel = Vector2(vel_red) * 1.4
elif overlap_blue: # Blue collides with the ball.
ball_vel = Vector2(vel_blue) * 1.4
# Drawing.
screen.blit(BG_IMG, (0, 0))
screen.blit(BALL, ballrect)
screen.blit(redcar, redrect)
screen.blit(bluecar, bluerect)
pygame.display.flip()
clock.tick(60)
pygame.quit()
答案 1 :(得分：0)
我编写了一个新的python库，用于检测凹/凸多边形和圆之间的碰撞。它工作得很好，并且效率很高。它非常易于使用，并且在存储库中有示例以及文档。