Pygame sprite不會顯示原因不明

Question

好吧，現在我已經嘗試修復我的Pygame代碼5天，這樣我就可以得到像平臺精靈已經工作的怪物精靈。

我找不到我的代碼錯誤，所以我的朋友也沒有。

#!/usr/bin/env python 
# -*- coding: utf-8 -*- 
import pygame, random, sys, os 
from pygame.locals import * 

pygame.init() #pygame initieres 

#skærm indstillinger 
window_size = [800, 600] 
window_mode = 0 
window_color_rate = 32 
screen = pygame.display.set_mode(window_size, window_mode, window_color_rate) 
background_image = 'background.jpg' 
background = (pygame.transform.scale(pygame.image.load(background_image).convert(), (800, 600))) 
pygame.display.set_caption('I Wanna Be the Reindeer') 
clock = pygame.time.Clock() 

class Platform(pygame.sprite.Sprite): 
    def __init__(self, color, x, y, width, height): 
     pygame.sprite.Sprite.__init__(self) 
     platform_image = 'platform.jpg' 
     self.image = pygame.transform.scale(pygame.image.load(platform_image).convert(), ([width, height])) 
     self.rect = self.image.get_rect() 
     self.rect.x = x 
     self.rect.y = y 

class Monster(pygame.sprite.Sprite): 
    def __init__(self, x, y, width, height): 
     pygame.sprite.Sprite.__init__(self) 
     monster_image = 'platform.jpg' 
     self.image = pygame.transform.scale(pygame.image.load(monster_image).convert(), ([width, height])) 
     self.rect = self.image.get_rect() 
     self.rect.x = x 
     self.rect.y = y 

class Goal(pygame.sprite.Sprite): 
    def __init__(self, color, x, y, width, height): 
     pygame.sprite.Sprite.__init__(self) 
     self.image = pygame.Surface([width, height]) 
     self.image.fill(color) 
     self.rect = self.image.get_rect() 
     self.rect.x = x 
     self.rect.y = y 

class Player(pygame.sprite.Sprite): 
    #variabler spilleren ændre 
    change_x = 0 
    change_y = 0 
    jump_ready = False 
    frame_since_collision = 0 
    frame_since_jump = 0 
    levelpoints = 0 
    player_right = 'mobright.png' 
    player_left = 'mobleft.png' 

    def __init__(self, color, x, y): 
     pygame.sprite.Sprite.__init__(self) 
     self.image = pygame.transform.scale(pygame.image.load(Player.player_right).convert_alpha(), [30, 30]) 
     self.rect = self.image.get_rect() 
     self.rect.x = x 
     self.rect.y = y 

    def changespeed_x(self, x): 
     self.change_x = x 

    def changespeed_y(self, y): 
     self.change_y = y 

    def jump(self): 
     self.jump_ready = True 
     self.frame_since_jump = 0 

    def update(self, platforms): 
     old_x = self.rect.x 
     new_x = old_x + self.change_x 
     self.rect.x = new_x 

     old_y = self.rect.y 
     new_y = old_y + self.change_y 
     self.rect.y = new_y 

     collide = pygame.sprite.spritecollide(self, platforms, False) 
     if collide: 
      self.rect.x = old_x 

     platform_hit_list = pygame.sprite.spritecollide(self, platforms, False) 
     for platform in platform_hit_list: 
      self.rect.x = old_x 
      self.rect.y = old_y 
      self.change_y = 0 
      self.frame_since_collision = 0 

     if self.frame_since_collision < 1 and self.frame_since_jump < 6: 
      self.frame_since_jump = 5 
      self.change_y -= 10 

     self.frame_since_collision += 1 
     self.frame_since_jump += 1 

    def gravity(self): 
     self.change_y += 0.35 

     if self.rect.y >= 570 and self.change_y >= 0: 
      self.change_y = 0 
      self.rect.y = 570 
      self.frame_since_collision = 0 

    def goalcheck(self, goals): 
     goal_hit_list = pygame.sprite.spritecollide(self, goals, True) 
     for goals in goal_hit_list: 
      Player.levelpoints += 1 

'''class Monster(pygame.sprite.Sprite): 
    global walk_quota 
    walk_quota = 0 
    def __init__(self, x, y, walk_distance, walk_interval): 
     pygame.sprite.Sprite.__init__(self) 
     monster_image = 'monsterright.png' 
     self.image = pygame.transform.scale(pygame.image.load(monster_image).convert_alpha(), [35, 35]) 
     self.rect = self.image.get_rect() 
     self.rect.x = x 
     self.rect.y = y 
     self.walk_distance = walk_distance 
     self.walk_interval = walk_interval 

    def walking(self): 
     global walk_quota 
     if self.walk_distance > walk_quota: 
      self.rect.x += self.walk_interval 
      walk_quota += self.walk_interval 
      print walk_quota 
''' 

    #spilleren skabes 
player = Player([255, 255, 0], 20, 15) 
player.rect.x = 700 
player.rect.y = 550 

#monster funktioner 
#def monsterwalk(): 
# for monster in monster_list: 
#  monster.walking() 

#gruppe indstillinger 
all_sprites_list = pygame.sprite.Group() 
platform_list = pygame.sprite.Group() 
goal_list = pygame.sprite.Group() 
monster_list = pygame.sprite.Group() 
all_sprites_list.add(player) 
all_sprites_list.add(platform_list) 
all_sprites_list.add(goal_list) 
all_sprites_list.add(monster_list) 

#level 1 
def level1(): 
    if Player.levelpoints == 0: 
     goal = goal_list.add(Goal((0, 255, 0), 50, 80, 20, 20)) 
     monster = monster_list.add(Monster(400, 600, 200, 200)) 
     for i in range(1, 6): 
      platform = platform_list.add(
       [Platform((0, 0, 255), 50, 100, i * 20, 20)]) 
     for i in range(1, 6): 
      platform = platform_list.add(
       [Platform((0, 0, 255), 150, 200, i * 20, 20)]) 
     for i in range(1, 6): 
      platform = platform_list.add(
       [Platform((0, 0, 255), 250, 300, i * 20, 20)]) 
     for i in range(1, 6): 
      platform = platform_list.add(
       [Platform((0, 0, 255), 350, 400, i * 20, 20)]) 
     for i in range(1, 6): 
      platform = platform_list.add(
       [Platform((0, 0, 255), 450, 500, i * 20, 20)]) 
     Player.levelpoints += 1 

#level2 
def level2(): 
    if Player.levelpoints == 2: 
     platform_list.empty() 
     platform = platform_list.add(
     [Platform((0, 0, 255), 600, 200, 100, 20)], 
     [Platform((0, 0, 255), 600, 300, 100, 20)], 
     [Platform((0, 0, 255), 600, 400, 100, 20)]) 
     Player.levelpoints += 1 

#*------Main loop------* 
while True: 
    #styring af spiller 
    for event in pygame.event.get(): 
     if event.type == pygame.QUIT: 
      sys.exit() 
     if event.type == pygame.KEYDOWN: 
      if event.key == K_LEFT: 
       player.changespeed_x(-4) 
       player.image = pygame.transform.scale(pygame.image.load(Player.player_left).convert_alpha(), [30, 30]) 
      if event.key == K_RIGHT: 
       player.changespeed_x(4) 
       player.image = pygame.transform.scale(pygame.image.load(Player.player_right).convert_alpha(), [30, 30]) 
      if event.key == K_DOWN: 
       player.changespeed_y(6) 
      if event.key == K_UP: 
       player.jump() 
     if event.type == KEYUP: 
      if event.key == K_LEFT: 
       player.changespeed_x(0) 
      if event.key == K_RIGHT: 
       player.changespeed_x(0) 

    if player.rect.x >= 800: 
     player.rect.x = -15 

    if player.rect.x <= -20: 
     player.rect.x = 799 

    #initiering af levels 
    level1() 
    level2() 

    #funktioner til opdating af objekter 
    player.gravity() 
    player.update(platform_list) 
    player.goalcheck(goal_list) 
    platform_list.update() 
    monster_list.update() 
    #monsterwalk() 

    #sprites og billeder der skal tegnes på skærmen 
    screen.fill((0, 0, 0)) 
    screen.blit(background, [0, 0]) 
    all_sprites_list.draw(screen) 
    platform_list.draw(screen) 
    monster_list.draw(screen) 
    goal_list.draw(screen) 

    clock.tick(500) 
    print Player.levelpoints 
    pygame.display.update() 

因爲現在我可以讓我的玩家，目標和平臺顯示，但不是怪物。

注意：怪物僅將平臺圖像用作佔位符。

Answer 1

您只需在屏幕外繪製它。

屏幕是800x600，而你在400, 600畫它，因此它是在屏幕的下緣的正下方：

嘗試400, 600 - height_of_monster_image代替，例如。