为什么按键后图像不会改变？

Question

import pygame import sys pygame.init()#We always need to initalize our pygame IN EVERY PROJECT/FILE win = pygame.display.set_mode((500, 480))# Here win is representing "window" for our screen which we have set at 500 by 480 pygame.display.set_caption("Dragon Ball Z Mini-game")#We are giving our Window/Screen a name walkRight = [pygame.image.load('image/young_goku_right_image0 - t.png'), pygame.image.load('image/young_goku_right_image1 - t.png'), pygame.image.load('image/young_goku_right_image2 - t.png'), pygame.image.load('image/young_goku_right_image3 - t.png'), pygame.image.load('image/young_goku_right_image4 - t.png')] walkLeft = [pygame.image.load('image/young_goku_left_image0 - t.png'), pygame.image.load('image/young_goku_left_image1 - t.png'), pygame.image.load('image/young_goku_left_image2 - t.png'), pygame.image.load('image/young_goku_left_image3 - t.png'), pygame.image.load('image/young_goku_left_image4 - t.png')] bg = pygame.image.load('image/bg2.jpg') char = pygame.image.load('image/young_goku - standing - t.png') clock = pygame.time.Clock() bulletSound = pygame.mixer.Sound("image/kiblast.wav") hitSound = pygame.mixer.Sound("image/Bomb+1.wav") #bulletSound.play() music = pygame.mixer.music.load("image/16 - Dragon Ball Z - title song.mp3") pygame.mixer.music.play(-1) score = 0 class player(object): def __init__(self, x, y, width, height): self.x = x self.y = y self.width = width self.height = height self.vel = 5 self.isJump = False self.left = False self.right = False self.walkCount = 0 self.jumpCount = 10 self.standing = True self.hitbox = (self.x + 17, self.y + 11, 29, 52) def draw(self, win): if self.walkCount + 1 >= 10: self.walkCount = 0 if not (self.standing): if self.left: win.blit(walkLeft[self.walkCount // 3], (self.x, self.y)) self.walkCount += 1 elif self.right: win.blit(walkRight[self.walkCount // 3], (self.x, self.y)) self.walkCount += 1 else: if self.right: win.blit(walkRight[0], (self.x, self.y)) else: win.blit(walkLeft[0], (self.x, self.y)) self.hitbox = (self.x + 17, self.y + 11, 29, 52) # pygame.draw.rect(win, (255,0,0), self.hitbox,2) def hit(self): self.isJump = False self.jumpCount = 10 self.x = 100 self.y = 410 self.walkCount = 0 font1 = pygame.font.SysFont('Papyrus', 100) text = font1.render('Attcked!', 1, (255, 0, 0)) win.blit(text, (250 - (text.get_width() / 2), 200)) pygame.display.update() i = 0 while i < 200: pygame.time.delay(10) i += 1 for event in pygame.event.get(): if event.type == pygame.QUIT: i = 201 pygame.quit() class projectile(): def __init__(self, x, y, radius, color, facing): self.x = x self.y = y self.radius = radius self.color = color self.facing = facing self.vel = 8 * facing def draw(self, win): pygame.draw.circle(win, (244, 232, 104), (self.x, self.y), self.radius) ki = pygame.image.load("image/ki.png") win.blit(ki, (self.x, self.y)) ki_stance = pygame.image.load("image/goku-ki.png") win.blit(ki, (self.x, self.y)) class projectile2(): def __init__(self, x, y, radius, color, facing): self.x = x self.y = y self.radius = radius self.color = color self.facing = facing self.vel = 8 * facing def draw(self, win): ki = pygame.image.load("image/b4.png") win.blit(ki, (self.x, self.y)) ki_stance = pygame.image.load("image/b4.png") win.blit(ki, (self.x, self.y)) class enemy(object): walkRight = [pygame.image.load("image/R1E.png"), pygame.image.load("image/R2E.png"), pygame.image.load("image/R3E.png"), pygame.image.load("image/R4E.png"), pygame.image.load("image/R5E.png"), pygame.image.load("image/R6E.png"), pygame.image.load("image/R7E.png"), pygame.image.load("image/R8E.png"), pygame.image.load("image/R9E.png"), pygame.image.load("image/R10E.png"), pygame.image.load("image/R11E.png")] walkLeft = [pygame.image.load("image/L1E.png"), pygame.image.load("image/L2E.png"), pygame.image.load("image/L3E.png"), pygame.image.load("image/L4E.png"), pygame.image.load("image/L5E.png"), pygame.image.load("image/L6E.png"), pygame.image.load("image/L7E.png"), pygame.image.load("image/L8E.png"), pygame.image.load("image/L9E.png"), pygame.image.load("image/L10E.png"), pygame.image.load("image/L11E.png")] def __init__(self, x, y, width, height, end): self.x = x self.y = y self.width = width self.height = height self.end = end self.path = [self.x, self.end] self.walkCount = 0 self.vel = 3 self.hitbox = (self.x + 17, self.y + 2, 31, 57) self.health = 10 self.visible = True def draw(self, win): self.move() if self.visible: if self.walkCount + 1 >= 33: self.walkCount = 0 if self.vel > 0: win.blit(self.walkRight[self.walkCount // 3], (self.x, self.y)) self.walkCount += 1 else: win.blit(self.walkLeft[self.walkCount // 3], (self.x, self.y)) self.walkCount += 1 pygame.draw.rect(win, (255, 0, 0), (self.hitbox[0], self.hitbox[1] - 20, 50, 10)) pygame.draw.rect(win, (0, 128, 0), (self.hitbox[0], self.hitbox[1] - 20, 50 - (5 * (10 - self.health)), 10)) self.hitbox = (self.x + 17, self.y + 2, 31, 57) # pygame.draw.rect(win, (255,0,0), self.hitbox,2) def move(self): if self.vel > 0: if self.x + self.vel < self.path[1]: self.x += self.vel else: self.vel = self.vel * -1 self.walkCount = 0 else: if self.x - self.vel > self.path[0]: self.x += self.vel else: self.vel = self.vel * -1 self.walkCount = 0 def hit(self): if self.health > 0: self.health -= 1 else: self.visible = False print('hit') class enemy2(): walkRight = [pygame.image.load("image/enemy-sprite-standing-T.gif"), pygame.image.load("image/enemy-sprite-moving_T.gif"), pygame.image.load("image/enemy-sprite-moving_T.gif"), pygame.image.load("image/enemy-sprite-move_right-T.gif")] walkLeft = [pygame.image.load("image/enemy-sprite-standing-T.gif"), pygame.image.load("image/enemy-sprite - moving_left-T.gif"), pygame.image.load("image/enemy-sprite - moving_left-T.gif"), pygame.image.load("image/enemy-sprite - moving_left2-T.gif")] def __init__(self, x, y, width, height, end): self.x = x self.y = y self.width = width self.height = height self.end = end self.path = [self.x, self.end] self.walkcount = 0 self.vel = 3 self.hitbox = (self.x + 20, self.y, 28, 60) self.health = 10 self.visible = True def draw(self, win): self.move() if self.visible: if self.walkcount + 0 >= 10: self.walkcount = 0 if self.vel > 0: win.blit(self.walkRight[self.walkcount // 3], (self.x, self.y)) self.walkcount += 1 else: win.blit(self.walkLeft[self.walkcount // 3], (self.x, self.y)) self.walkcount += 1 pygame.draw.rect(win, (255, 0, 0), (self.hitbox[0], self.hitbox[1] - 20, 50, 10)) pygame.draw.rect(win, (0, 128, 0), (self.hitbox[0], self.hitbox[1] - 20, 50 - (5 * (10 - self.health)), 10)) self.hitbox = (self.x + 20, self.y, 28, 60) def move(self): if self.vel > 0: if self.x + self.vel < self.path[1]: self.x += self.vel else: self.vel = self.vel * -1 self.walkcount = 0 else: if self.x - self.vel > self.path[0]: self.x += self.vel else: self.vel = self.vel * -1 self.walkcount = 0 def hit(self): if self.health > 0: self.health -= 1 else: self.visible = False print("Hit!!") pass def redrawGameWindow(): win.blit(bg, (0, 0)) text = font.render('Score: ' + str(score), 1, (0, 0, 0)) win.blit(text, (350, 10)) goblin.draw(win) goblin2.draw(win) man.draw(win) for bullet in bullets: bullet.draw(win) pygame.display.update() # mainloop font = pygame.font.SysFont('comicsans', 30, True) man = player(200, 410, 64, 64) goblin = enemy(110, 410, 64, 64, 450) goblin2 = enemy2(50, 410, 64, 64, 450) shootLoop = 0 bullets = [] run = True while run: clock.tick(27) if goblin.visible == True: if man.hitbox[1] < goblin.hitbox[1] + goblin.hitbox[3] and man.hitbox[1] + man.hitbox[3] > goblin.hitbox[1]: if man.hitbox[0] + man.hitbox[2] > goblin.hitbox[0] and man.hitbox[0] < goblin.hitbox[0] + goblin.hitbox[2]: man.hit() score -= 5 if goblin2.visible == True: if man.hitbox[1] < goblin2.hitbox[1] + goblin2.hitbox[3] and man.hitbox[1] + man.hitbox[3] > goblin2.hitbox[1]: if man.hitbox[0] + man.hitbox[2] > goblin2.hitbox[0] and man.hitbox[0] < goblin2.hitbox[0] + goblin2.hitbox[2]: man.hit() score -= 5 if shootLoop > 0: shootLoop += 1 if shootLoop > 3: shootLoop = 0 for event in pygame.event.get(): if event.type == pygame.QUIT: run = False for bullet in bullets: if bullet.y - bullet.radius < goblin.hitbox[1] + goblin.hitbox[3] and bullet.y + bullet.radius > goblin.hitbox[1]: if bullet.x + bullet.radius > goblin.hitbox[0] and bullet.x - bullet.radius < goblin.hitbox[0] + goblin.hitbox[2]: goblin.hit() score += 1 bullets.pop(bullets.index(bullet)) if bullet.x < 500 and bullet.x > 0: bullet.x += bullet.vel else: bullets.pop(bullets.index(bullet)) for bullet in bullets: if bullet.y - bullet.radius < goblin2.hitbox[1] + goblin2.hitbox[3] and bullet.y + bullet.radius > goblin2.hitbox[1]: if bullet.x + bullet.radius > goblin2.hitbox[0] and bullet.x - bullet.radius < goblin2.hitbox[0] + goblin2.hitbox[2]: goblin2.hit() score += 1 bullets.pop(bullets.index(bullet)) if bullet.x < 500 and bullet.x > 0: bullet.x += bullet.vel else: bullets.pop(bullets.index(bullet)) keys = pygame.key.get_pressed() if keys[pygame.K_SPACE] and shootLoop == 0: #bulletSound.play() if man.left: facing = -1 else: facing = 1 if len(bullets) < 5: bullets.append(projectile(round(man.x + man.width // 2), round(man.y + man.height // 2), 6, (0, 0, 0), facing)) shootLoop = 1 **Here where am trying to see if my image changes when i press a key button** if keys[pygame.K_a] and shootLoop == 0: ki_stance = pygame.image.load("image/goku-ki.png") win.blit(ki_stance, (0, 0)) if man.left: facing = -1 else: facing = 1 if len(bullets) < 3.30: bullets.append(projectile2(round(man.x + man.width // 2), round(man.y + man.height // 2), 6, (0, 0, 0), facing)) if keys[pygame.K_LEFT] and man.x > man.vel: man.x -= man.vel man.left = True man.right = False man.standing = False elif keys[pygame.K_RIGHT] and man.x < 500 - man.width - man.vel: man.x += man.vel man.right = True man.left = False man.standing = False else: man.standing = True man.walkCount = 0 if not (man.isJump): if keys[pygame.K_UP]: man.isJump = True man.right = False man.left = False man.walkCount = 0 else: if man.jumpCount >= -10: neg = 1 if man.jumpCount < 0: neg = -1 man.y -= (man.jumpCount ** 2) * 0.5 * neg man.jumpCount -= 1 else: man.isJump = False man.jumpCount = 10 redrawGameWindow() pygame.quit()

Answer 1

redrawGameWindow所做的第一件事是在 window 中绘制背景：

 def redrawGameWindow(): win.blit(bg, (0, 0)) # [...]

在调用redrawGameWindow之前绘制的所有内容都是“不可见的”，因为背面覆盖了整个屏幕：

 if keys[pygame.K_a] and shootLoop == 0: ki_stance = pygame.image.load("image/goku-ki.png") win.blit(ki_stance, (0, 0)) # <----- "INVISIBLE" # [...] redrawGameWindow() # <---- because it is covered here

---

在应用程序循环之前，在初始化时加载所有图像：

ki = pygame.image.load("image/ki.png")
ki_stance = pygame.image.load("image/goku-ki.png")

更改 class projectile ， stance是 class 的构造函数的新参数。 您根本不需要 class projectile2 （删除projectile2 ）：

class projectile():
    def __init__(self, x, y, radius, color, facing, stance):
        self.x = x
        self.y = y
        self.radius = radius
        self.color = color
        self.facing = facing
        self.vel = 8 * facing
        self.stance = stance

    def draw(self, win):
        pygame.draw.circle(win, (244, 232, 104), (self.x, self.y), self.radius)
        image = ki_stance if self.stance else ki
        win.blit(image, (self.x, self.y))

当按下SPACE或a时，生成一个射弹：

if keys[pygame.K_SPACE] and shootLoop == 0  and len(bullets) < 5:
    #bulletSound.play()
    facing = -1 if man.left else 1
    x, y = round(man.x + man.width // 2), round(man.y + man.height // 2)
    bullets.append(projectile(x, y, 6, (0, 0, 0), facing, False))
    shootLoop = 1

if keys[pygame.K_a] and shootLoop == 0  and len(bullets) < 3.30:
    facing = -1 if man.left else 1 
    x, y = round(man.x + man.width // 2), round(man.y + man.height // 2)
    bullets.append(projectile(x, y, 6, (0, 0, 0), facing, True))
    shootLoop = 1

---

如果您想为玩家显示不同的精灵，当按下a时，您必须在player.draw中进行。 例如：

b4Image = pygame.image.load("image/b4.png")

class player(object):
    # [...]

    def draw(self, win):
        if self.walkCount + 1 >= 10:
            self.walkCount = 0

        keys = pygame.key.get_pressed()
        if keys[pygame.K_a]:
            win.blit(b4Image, (self.x, self.y))

        elif not (self.standing):
            if self.left:
                win.blit(walkLeft[self.walkCount // 3], (self.x, self.y))
                self.walkCount += 1
            elif self.right:
                win.blit(walkRight[self.walkCount // 3], (self.x, self.y))
                self.walkCount += 1
        else:
            if self.right:
                win.blit(walkRight[0], (self.x, self.y))
            else:
                win.blit(walkLeft[0], (self.x, self.y))
        self.hitbox = (self.x + 17, self.y + 11, 29, 52)