0

我在这里先向您的帮助表示感谢。我是 Python 语言的新手，使用这个项目来学习 Python，现在它使用一个函数在屏幕上绘制图块，我正在努力让一个精灵能够通过按键移动。问题是我的函数 keyMoveSprite() 看不到我的全局变量 x_coordinate 和 y_coordinate。它们在我的函数内部，但这导致我的精灵不移动，因为 x 和 y 变量每次迭代都设置回 0，所以我认为它们需要在循环之外。有什么建议么？这是我的代码。我有点认为这个问题可能是由于在我的游戏主循环中重复调用的函数，但需要重复调​​用它来跟踪输入。

import pygame,sys
from pygame.locals import *

pygame.init()  

#Global Variables
screen_x = 800
screen_y = 480
screen =  pygame.display.set_mode((screen_x, screen_y))
x_coordinate = 0
y_coordinate = 0
moveX, moveY = 0, 0


#This function will take the screen coordinates and draw
#a tile to the entire screen. It will draw tiles no matter
#the screen size.

def keyMoveSprite():
    sprite = pygame.image.load("character.png").convert_alpha()

    for event in pygame.event.get():

        if event.type == KEYDOWN:
            if event.key == K_LEFT:
                moveX = -10
            elif event.key == K_RIGHT:
                moveX = +10
            elif event.key == K_UP:
                moveY = -10
            elif event.key == K_DOWN:
                moveY = +10

        if event.type == KEYUP:
            if event.key == K_LEFT:
                moveX = 0
            elif event.key == K_RIGHT:
                moveX = 0
            elif event.key == K_UP:
                moveY = 0
            elif event.key == K_DOWN:
                moveY = 0

    x_coordinate = x_coordinate + moveX
    y_coordinate = y_coordinate + moveY

    screen.blit(sprite,(x_coordinate, y_coordinate))
    pygame.display.update()
    print("Character drawn at:", x_coordinate, y_coordinate)


def mapDraw(screen_x, screen_y):



    floor = pygame.image.load("floor_tile.png")
    wall = pygame.image.load("wall_tile.png")
    treasure = pygame.image.load("treasure_chest.png")

# Intialize row for loop
    row = 0
    mapColumn = 0
    mapRow = 0

#Loop between the values 0 to the screen's y variable, in intervals of
#32, and store them in the variable row once per loop.

    mapArray = [
        [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1],
        [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
        ]


    for row in range(0, screen_y, 32):
        column = 0 # Set column to 0 per iteration, this allows reset of the x coordinate
        print("Map Row Value:", mapRow)
        mapColumn = 0 # Resets mapColumn variable to 0
        for column in range(0, screen_x, 32):

            if mapArray[mapRow][mapColumn] == 0:

                screen.blit(floor, (column, row)) 
                #print(column,row)
                pygame.display.update()
                #print("Map Column Value:",mapColumn)
                print("MapCol",mapColumn,"MapRow",mapRow)

            elif mapArray[mapRow][mapColumn] == 1:
                screen.blit(wall, (column, row))
                pygame.display.update()







            mapColumn = mapColumn + 1

        mapRow = mapRow + 1


def main():

    mapFloor = mapDraw(800,480)
    while True:

        keyMoveSprite()

main()
4

1 回答 1

1

尝试使用global 关键字，以便解释器可以在 和 的本地分配之间消除x_coordinate歧义y_coordinate：

def keyMoveSprite():
    global x_coordinate, y_coordinate
    # The rest of your code...

解决此问题的更好方法是创建一个类来表示您的玩家、它的位置以及与之相关的其他状态，而不是将所有内容存储在全局变量中。

于 2013-11-09T07:23:45.090 回答