我正在尝试实现一个移动系统，让玩家向点击位置移动。但是我一直在讨论运动方法的一些问题。
移动方法当前需要将所有变量作为参数：
此代码有效：
def move(self,event,mouse_pos, screen, background):
if event.type == MOUSEBUTTONDOWN:
if mouse_pos[1] > self.pos[1]:
screen.blit(background, self.pos, self.pos) #erases players by bliting bg
self.speed = 1
self.move_south() #moves player
if mouse_pos[0] > self.pos[0]:
screen.blit(background, self.pos, self.pos) #erases players by bliting bg
self.speed = 1
self.move_east() #moves player
screen.blit(self.image, self.pos) #draws player
此代码无效：
def move(self,event):
if event.type == MOUSEBUTTONDOWN:
if mouse_pos[1] > self.pos[1]:
screen.blit(background, self.pos, self.pos) #erases players by bliting bg
self.speed = 1
self.move_south() #moves player
if mouse_pos[0] > self.pos[0]:
screen.blit(background, self.pos, self.pos) #erases players by bliting bg
self.speed = 1
self.move_east() #moves player
screen.blit(self.image, self.pos) #draws player
全班代码：
import pygame, sys
from pygame.locals import *
class GameObject:
def __init__(self, image, height, speed):
self.speed = speed
self.image = image
self.pos = image.get_rect().move(0, height) #initial placement
def move_south(self):
self.pos = self.pos.move(0, self.speed)
if self.pos.right > 600:
self.pos.left = 0
def move_east(self):
self.pos = self.pos.move(self.speed , 0)
if self.pos.right > 600:
self.pos.left = 0
def move(self,event,mouse_pos, screen, background):
if event.type == MOUSEBUTTONDOWN:
if mouse_pos[1] > self.pos[1]:
screen.blit(background, self.pos, self.pos) #erases players by bliting bg
self.speed = 1
self.move_south() #moves player
if mouse_pos[0] > self.pos[0]:
screen.blit(background, self.pos, self.pos) #erases players by bliting bg
self.speed = 1
self.move_east() #moves player
screen.blit(self.image, self.pos) #draws player
主要脚本代码：
import pygame, sys
from pygame.locals import *
from classes import *
screen = pygame.display.set_mode((640, 480))
#Importing Chars
player = pygame.image.load('green_hunter_small.png').convert()
#player.set_alpha(100) #makes whole player transparent
player.set_colorkey((0,0,0)) #sets background colour to transparent
ennemi = pygame.image.load('red_hunter_small.png').convert()
ennemi.set_colorkey((0,0,0))
background = pygame.image.load('grass_map_640x640.png').convert()
screen.blit(background, (0, 0))
objects = []
mouse_pos = (320, 240)
objects.append(GameObject(player, 80, 0))
for x in range(2): #create 2 objects
o = GameObject(ennemi, x*40, 0)
objects.append(o)
while True:
for event in pygame.event.get(): #setting up quit
if event.type == QUIT:
pygame.quit()
sys.exit()
if event.type == MOUSEBUTTONDOWN :
mouse_pos = pygame.mouse.get_pos()
print mouse_pos
for o in objects:
screen.blit(background, o.pos, o.pos) #erases players by bliting bg
for o in objects:
o.move(event,mouse_pos,screen,background)
pygame.display.update()
pygame.time.delay(100)
我有两个问题： 1）如何减少我的方法的参数数量？ 2）如何让我的玩家不断向点击位置移动而不是每次点击一次？
答案 0 :(得分：1)
因此，经过一些工作，我找到了解决问题的方法。
我只有两个互相导入的python文件。
我必须创建第三个文件以避免这种“循环”输入。
我使用名为main.py的主代码创建了一个文件，导入了classes.py文件和variables.py文件。
main.py：
import pygame, sys, variables
from pygame.locals import *
from classes import *
#Creating the characters
objects = []
objects.append(GameObject(variables.player, 80, 0))
for x in range(2): #create 2 objects
o = GameObject(variables.ennemi, x*40, 0)
objects.append(o)
#game loop
while True:
for event in pygame.event.get(): #setting up quit
if event.type == QUIT:
pygame.quit()
sys.exit()
if event.type == MOUSEBUTTONDOWN : #initiating movement on click
for o in objects:
variables.screen.blit(variables.background, o.pos, o.pos) #erases players by bliting bg
for o in objects:
o.move(event)
pygame.display.update()
pygame.time.delay(20)
classes.py：
import pygame, sys, variables
from pygame.locals import *
class GameObject:
def __init__(self, image, height, speed):
self.speed = speed
self.image = image
self.pos = image.get_rect().move(0, height) #initial placement
def move_NS(self):
self.pos = self.pos.move(0, self.speed)
if self.pos.right > 600:
self.pos.left = 0
def move_EW(self):
self.pos = self.pos.move(self.speed , 0)
if self.pos.right > 600:
self.pos.left = 0
def move(self,event):#,mouse_pos, screen, background
if event.type == MOUSEBUTTONDOWN:
if pygame.mouse.get_pos()[1] > self.pos[1]:
variables.screen.blit(variables.background, self.pos, self.pos) #erases players by bliting bg
self.speed = 1
self.move_NS() #moves player
if pygame.mouse.get_pos()[0] > self.pos[0]:
variables.screen.blit(variables.background, self.pos, self.pos) #erases players by bliting bg
self.speed = 1
self.move_EW() #moves player
if pygame.mouse.get_pos()[1] < self.pos[1]:
variables.screen.blit(variables.background, self.pos, self.pos) #erases players by bliting bg
self.speed = -1
self.move_NS() #moves player
if pygame.mouse.get_pos()[0] < self.pos[0]:
variables.screen.blit(variables.background, self.pos, self.pos) #erases players by bliting bg
self.speed = -1
self.move_EW() #moves player
variables.screen.blit(self.image, self.pos) #draws player
variables.py：
import pygame, sys
from pygame.locals import *
#Variables
screen = pygame.display.set_mode((640, 480))
#Importing Chars
player = pygame.image.load('green_hunter_small.png').convert()
player.set_colorkey((0,0,0)) #sets background colour to transparent
ennemi = pygame.image.load('red_hunter_small.png').convert()
ennemi.set_colorkey((0,0,0))
#importing background
background = pygame.image.load('grass_map_640x640.png').convert()
screen.blit(background, (0, 0))
希望它有所帮助！
答案 1 :(得分：0)
你的问题是python中的“全局”变量实际上并不是全局变量，而是定义它们的模块的本地变量。因此，你不能在main.py文件中引用十进制全局变量classes.py 1}}文件。
有三种可能的解决方案：
（不推荐）将screen和background的声明移至classes.py文件，这会使它们看起来不合适。
（也不建议）在from main import screen, background文件中添加classes.py，这会产生循环导入问题，迫使main.py模块执行from classes import * < strong> 后定义screen和background
display.py或screen.py文件，其中screen和background变量已定义，并从main.py和classes.py导入 mouse_pos变量完全没必要且误用：
pygame.mouse.get_pos()文件中使用classes.py，但pygame.mouse.get_pos()本身是绝对的，因为pygame.MOUSEBUTTONDOWN事件的pos属性指向事件被触发时鼠标的位置。