python - Pygame 在事件发生后移动 Sprite 坐标

Question

我一直在尝试用 pygame 制作一款足球游戏，几乎成功完成，但是，我有一些问题。我试图在进球后移动球。我尝试将球移动到 ball_x 和 ball_y 坐标，但它不起作用。我的代码如下，我真的希望有人可以编辑我的代码，使其正常工作。

import pygame
import pygame as pg
from pygame.math import Vector2


pygame.init()


WIDTH = 1150
HEIGHT = 800
screen = pygame.display.set_mode((WIDTH, HEIGHT))
clock = pygame.time.Clock()
# Images.
bgImg = pygame.image.load("Football_pitch.png")
REDGOAL = pg.Surface((50, 150), pg.SRCALPHA)
REDGOAL.fill((255, 0, 0))
redgoal_rect = REDGOAL.get_rect(topleft=(0, 340))
redgoal_mask = pg.mask.from_surface(REDGOAL)
BLUEGOAL = pg.Surface((50, 150), pg.SRCALPHA)
BLUEGOAL.fill((0, 0, 255))
bluegoal_rect = REDGOAL.get_rect(topleft=(1100, 340))
bluegoal_mask = pg.mask.from_surface(REDGOAL)


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

score = 0
redspeed = 7
bluespeed = 7
ball_x = 575
ball_y = 400
dx = 0
dy = 0
x = 800
y = 500



BALL = pygame.Surface((30, 30), pygame.SRCALPHA)
pygame.draw.circle(BALL, [0,0,0], [15, 15], 15)
# Ball variables.
ball_pos = Vector2(ball_x, ball_y)
ballrect = BALL.get_rect(center=ball_pos)
ball_vel = Vector2(dx, dy)
ball_mask = pg.mask.from_surface(BALL)
# Car variables.
pos_red = Vector2(x,y)
vel_red = Vector2(redspeed,0)
redrect = redcar.get_rect(center=pos_red)
redangle = 180
pos_blue = Vector2(275,300)
vel_blue = Vector2(bluespeed,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)
ballrect = BALL.get_rect(center=ball_pos)
vel_red.rotate_ip(-180)

def redgoal():
        print("Red Goal!!!")
        ball_x = 300
        ball_y = 300

def bluegoal():
        print("Blue Goal!!!")
        boostedspeedred = 10


run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False


    if y <0:
        y = 10
    if y > 450:
        y = 440
    if x > 480:
        x = 470



    if ballrect.top < 0 and ball_vel.y < 0:
        ball_vel.y *= -1
    elif ballrect.bottom > screen.get_height() and ball_vel.y > 0:
        ball_vel.y *= -1
    if ballrect.left < 0 and ball_vel.x < 0:
        ball_vel.x *= -1
    elif ballrect.right > screen.get_width() and ball_vel.x > 0:
        ball_vel.x *= -1

    if redrect.top < 0 and redrect.y < 0:
        redrect.y *= +10
    elif redrect.bottom > screen.get_height() and redrect.y > 0:
        redrect.y *= -10
    if redrect.left < 0 and redrect.x < 0:
        redrect.x *= -10
    elif redrect.right > screen.get_width() and redrect.x > 0:
        redrect.x *= -10

    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)
    elif keys[pygame.K_UP]:
        redspeed == 10



    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)
    offset = redgoal_rect[0] - ballrect[0], redgoal_rect[1] - ballrect[1]
    redgoaloverlap = ball_mask.overlap(redgoal_mask, offset)
    offset = bluegoal_rect[0] - ballrect[0], bluegoal_rect[1] - ballrect[1]
    bluegoaloverlap = ball_mask.overlap(bluegoal_mask, offset)

    if redgoaloverlap:
        redgoal()
    if bluegoaloverlap:
        bluegoal()

    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(bgImg, (0, 0))
    screen.blit(BALL, ballrect)
    screen.blit(redcar, redrect)
    screen.blit(bluecar, bluerect)
    screen.blit(REDGOAL, redgoal_rect)
    screen.blit(BLUEGOAL, bluegoal_rect)

    pygame.display.flip()
    pygame.display.update()
    clock.tick(60)

pygame.quit()

Answer 1

问题是您正在设置 ball_x 和 ball_y，但球并未在这些位置绘制。球实际上是在名为 ball_pos 的向量中的坐标处绘制的。

要解决此问题:

1. 正如您可能猜到的，有一个非常简单的解决方案:只需重置 ball_pos 即可。
2. 此外，我重置了矢量 ball_vel，因此球再次移动到中心后不再移动。

您可能还想添加重置汽车位置的代码。此外，只有出现“红色球门”时，球才会重置。

这是固定代码:

import pygame
import pygame as pg
from pygame.math import Vector2


pygame.init()


WIDTH = 1150
HEIGHT = 800
screen = pygame.display.set_mode((WIDTH, HEIGHT))
clock = pygame.time.Clock()
# Images.
bgImg = pygame.image.load("Football_pitch.png")
REDGOAL = pg.Surface((50, 150), pg.SRCALPHA)
REDGOAL.fill((255, 0, 0))
redgoal_rect = REDGOAL.get_rect(topleft=(0, 340))
redgoal_mask = pg.mask.from_surface(REDGOAL)
BLUEGOAL = pg.Surface((50, 150), pg.SRCALPHA)
BLUEGOAL.fill((0, 0, 255))
bluegoal_rect = REDGOAL.get_rect(topleft=(1100, 340))
bluegoal_mask = pg.mask.from_surface(REDGOAL)


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

score = 0
redspeed = 7
bluespeed = 7
ball_x = 575
ball_y = 400
dx = 0
dy = 0
x = 800
y = 500



BALL = pygame.Surface((30, 30), pygame.SRCALPHA)
pygame.draw.circle(BALL, [0,0,0], [15, 15], 15)
# Ball variables.
ball_pos = Vector2(ball_x, ball_y)
ballrect = BALL.get_rect(center=ball_pos)
ball_vel = Vector2(dx, dy)
ball_mask = pg.mask.from_surface(BALL)
# Car variables.
pos_red = Vector2(x,y)
vel_red = Vector2(redspeed,0)
redrect = redcar.get_rect(center=pos_red)
redangle = 180
pos_blue = Vector2(275,300)
vel_blue = Vector2(bluespeed,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)
ballrect = BALL.get_rect(center=ball_pos)
vel_red.rotate_ip(-180)

def redgoal():
        print("Red Goal!!!")
        ball_vel.x = 0
        ball_vel.y = 0
        ball_pos.x = 575
        ball_pos.y = 400



def bluegoal():
        print("Blue Goal!!!")
        boostedspeedred = 10


run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False


    if y <0:
        y = 10
    if y > 450:
        y = 440
    if x > 480:
        x = 470



    if ballrect.top < 0 and ball_vel.y < 0:
        ball_vel.y *= -1
    elif ballrect.bottom > screen.get_height() and ball_vel.y > 0:
        ball_vel.y *= -1
    if ballrect.left < 0 and ball_vel.x < 0:
        ball_vel.x *= -1
    elif ballrect.right > screen.get_width() and ball_vel.x > 0:
        ball_vel.x *= -1

    if redrect.top < 0 and redrect.y < 0:
        redrect.y *= +10
    elif redrect.bottom > screen.get_height() and redrect.y > 0:
        redrect.y *= -10
    if redrect.left < 0 and redrect.x < 0:
        redrect.x *= -10
    elif redrect.right > screen.get_width() and redrect.x > 0:
        redrect.x *= -10

    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)
    elif keys[pygame.K_UP]:
        redspeed == 10



    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)
    offset = redgoal_rect[0] - ballrect[0], redgoal_rect[1] - ballrect[1]
    redgoaloverlap = ball_mask.overlap(redgoal_mask, offset)
    offset = bluegoal_rect[0] - ballrect[0], bluegoal_rect[1] - ballrect[1]
    bluegoaloverlap = ball_mask.overlap(bluegoal_mask, offset)

    if redgoaloverlap:
        redgoal()
    if bluegoaloverlap:
        bluegoal()

    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(bgImg, (0, 0))
    screen.blit(BALL, ballrect)
    screen.blit(redcar, redrect)
    screen.blit(bluecar, bluerect)
    screen.blit(REDGOAL, redgoal_rect)
    screen.blit(BLUEGOAL, bluegoal_rect)

    pygame.display.flip()
    pygame.display.update()
    clock.tick(60)

pygame.quit()