pygame "invalid position for blit"

Question

我正在尝试制作游戏，但是当我运行代码时，游戏让 5 个敌人出现在屏幕上。它说“blit 的位置无效”。但是，我不知道将 blit 放在哪里。我不知道该怎么办，因为我还在学习。在添加副本之前代码很好。不确定为什么会发生任何变化。

这是完整代码：

import pygame
import random
import math
from pygame import mixer
#Imports the pygame, random, math and mixer module. 

pygame.init()
#Initializes Pygame

screen = pygame.display.set_mode((800,600))
#Sets the screen to pygame looks and not normal python looks.

pygame.display.set_caption("Draft")
#Changes the title

icon = pygame.image.load('C:/Users/user/Desktop/Python/CodingBee/doctor.png')
pygame.display.set_icon(icon)
#Changing the Icon

#Adding Background Music
mixer.music.load('C:/Users/user/Desktop/Python/CodingBee/sb_indreams.mp3')
mixer.music.play(-1)
#Loads the music and plays if until the window is closed

#Colors
white = (255,255,255)
black = (0,0,0) 
red = (255,0,0)
green = (0,255,0)
blue = (0,0,255)
#Setting color variables to make it easier to access later in the code.

#Player
player_img = pygame.image.load('C:/Users/user/Desktop/Python/CodingBee/Doctor_Running-removebg-preview (1).png')
playerx = 20
playery = 390
playerx_change = 0
playery_change = 100
#Making the Player Variables. 

#Health Kit
HealthImg = pygame.image.load('C:/Users/user/Desktop/Python/CodingBee/first-aid-kit.png')
HealthX = 20
HealthY = 405
HealthX_Change = -10
HealthY_Change = 0
Health_State = "ready"
#Making the Health_Kit Variables.

#Enemy
enemyImg = []
enemyX = []
enemyY = []
enemyX_change = []
enemyY_change = []
number_of_enemies = 5
#Making a list for all 5 enemies image, x value, y value, x value change, y value change. All variables are a seperate list

for i in range(number_of_enemies):
    enemyImg.append(pygame.image.load('C:/Users/user/Desktop/Python/CodingBee/zombie.png'))
    enemyX.append(random.randint(0, 736))
    enemyY.append(random.randint(50, 150))
    enemyX_change.append(0.45)
    enemyY_change.append(40)

#Score
Score_Value = 0
font = pygame.font.Font('C:/Users/user/Desktop/Python/Pygame/Space_Invaders/Mostery.ttf', 25)
#The pygame font extension requires 2 values, the font and the font size. 
#.ttf is a font extension
#Making the score variable
ScoreX = 10
ScoreY = 25
#Making a variable for the fonts x and y position

#Heading
headingfont = pygame.font.Font('C:/Users/user/Desktop/Python/Pygame/Space_Invaders/Bouncy-PERSONAL_USE_ONLY.otf', 45)
HeadingX = 230
HeadingY = 10

#Game Over
game_over_font = pygame.font.Font('C:/Users/user/Desktop/Python/Pygame/Space_Invaders/Bouncy-PERSONAL_USE_ONLY.otf', 64)


#Creating Classes
class Background():
      def __init__(self):
            self.bgimage = pygame.image.load('C:/Users/user/Desktop/Python/CodingBee/Ground.png')
            self.rectBGimg = self.bgimage.get_rect()
 
            self.bgY1 = 485
            self.bgX1 = 0
 
            self.bgY2 = 485
            self.bgX2 = self.rectBGimg.width
 
            self.moving_speed = 7
         
      def update(self):
        self.bgX1 -= self.moving_speed
        self.bgX2 -= self.moving_speed

        if self.bgX1 <= -self.rectBGimg.width:
            self.bgX1 = self.rectBGimg.width
        if self.bgX2 <= -self.rectBGimg.width:
            self.bgX2 = self.rectBGimg.width
             
      def render(self):
         screen.blit(self.bgimage, (self.bgX1, self.bgY1))
         screen.blit(self.bgimage, (self.bgX2, self.bgY2))


class Player():
    def draw_player():
        screen.blit(player_img,(playerx,playery))

    def player_jump():
        global playery
        playery -= playery_change

class Enemy():
    def draw_enemy(enemyx,enemyy,i):
        screen.blit(enemyImg[i],(enemyx,enemyy))

    def move_enemy():
        global enemyX
        enemyX[i] += enemyX_change[i]

class Health():
    def fire_Health (x,y):
        global Health_State
        Health_State = "fire"
        screen.blit(HealthImg, ( x + 70, y + 10))


class Other():
    def isCollision(enemyX, enemyY, HealthX, HealthY):
        distance = math.sqrt(math.pow(enemyX - HealthX, 2) + (math.pow(enemyY - HealthY, 2)))
        if distance < 27:
            return True
        else:
            return False

    def show_heading():
        Heading = headingfont.render("Health Run!", True, (255,255,255))
        screen.blit(Heading,( HeadingX, HeadingY))

    def show_score():
        Score = font.render("Score = " + str(Score_Value), True, (255,255,255))
        screen.blit(Score,( ScoreX, ScoreY))

    def game_over():
        Game_Over = headingfont.render("GAME OVER!", True, (255,255,255))
        screen.blit(Game_Over,( 200, 400))

Score_Value = 0

#def states an event. The event will not occur unless you call the event in the main game loop.
back_ground = Background()

#Main Game Loop
clock = pygame.time.Clock()

SCEEN_UPDATE = pygame.USEREVENT
pygame.time.set_timer(SCEEN_UPDATE,150)


running = True
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_UP:
               Player.player_jump()

            if event.key == pygame.K_SPACE:
                if Health_State == "ready":
                    Health_Fire_Sound = mixer.Sound('C:/Users/user/Desktop/Python/Pygame/Space_Invaders/laser.wav')
                    Health_Fire_Sound.play()
                    Health.fire_Health(HealthX , HealthY)
                    HealthY  = playery + 10

        if event.type == pygame.KEYUP:
            if event.key == pygame.K_UP:
               playery += playery_change

            
    screen.fill(blue)
    back_ground.update()
    back_ground.render()

    #Health Kit Movement
    if HealthX >= 800:
        HealthX = 20
        Health_State = "ready"

    if Health_State == "fire":
        Health.fire_Health(HealthX , HealthY)
        HealthX -= HealthX_Change


    #Enemy Movement and collision check
    for i in range(number_of_enemies):

        if enemyX[i] > 20:
            for j in range(number_of_enemies):
                enemyY = 2000
            Other.game_over()
            break

        Enemy.move_enemy()
        collision = Other.isCollision(enemyX[i],enemyY[i],HealthX,HealthY)
        if collision:
            BulletY = 480
            Bullet_State = "ready"
            enemyX[i] = random.randint(800,900)
            enemyY[i] = 405
            HealthX = 20
            Health_State = "ready"
            Score_Value += 1

    # draw objects
    Player.draw_player()
    Enemy.draw_enemy(enemyX,enemyY, i)
    Other.show_heading()
    Other.show_score()

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

Answer 1

enemyX 和 enemyY 是坐标列表。您有 2 个选择：

将列表项传递给 draw_enemy:

class Enemy():
    def draw_enemy(enemyx, enemyy, i):
        screen.blit(enemyImg[i], (enemyx, enemyy))

 Enemy.draw_enemy(enemyX[i], enemyY[i], i)

从 draw_enemy 中的列表中获取项目：

class Enemy():
    def draw_enemy(enemyx, enemyy, i):
        screen.blit(enemyImg[i], (enemyx[i], enemyy[i]))

 Enemy.draw_enemy(enemyX, enemyY, i)

无论如何，我建议创建一个带有属性的 Enemy class（参见 Classes）。请注意，以下代码并不完整，它只是一个如何实现 classes 和使用对象实例的示例。我将把它留给您作为练习，将其合并到您的代码中。

class Enemy():
    def __init__(self, image, x, y, changeX, changeY):
        self.image = image
        self.x = x
        self.y = y
        self.changeX = changeX
        self.changeY = changeY

    def move(self):
        self.x += self.changeX
        self.y += self.changeY

    def draw(self):
        screen.blit(self.image, (self.x, self.y))

number_of_enemies = 5
enemies = []
enemyImg = pygame.image.load('C:/Users/user/Desktop/Python/CodingBee/zombie.png')
for i in range(number_of_enemies):
    x = random.randint(0, 736)
    y = random.randint(50, 150)
    enemy = Enemy(enemyImg, x, y, 0.45, 0)
    enemies.append(enemy)

running = True
while running:
    # [...]

    for enemy in enemies:
        enemy.move()

    # [...]

    for enemy in enemies:
        enemy.draw()

    # [...]

pygame "invalid position for blit"

pygame "invalid position for blit"

python

user-interface

pygame

blit