我正在尝试制作一款水果忍者游戏。我目前的目标是在我的画布上生成无限的、掉落的果实(总共4列，随机速度(，其中几个同时出现(不像在另一个消失后生成一个(。并跟踪它们中的每一个，这样以后我就可以进行碰撞(如果刀子是否击中它们(，如果是的话，我可以摧毁它们
以前，我尝试过root.after方法，但它显然不适用于我的代码，因为一旦再次调用该函数，变量将被分配给新的照片，因此以前的结果将消失。
我正在考虑在我展示的这个版本的代码中使用递归。它不能正常工作：果实会产生，但就像after()方法一样，一旦到达点，它就会消失，只有在前一个果实消失后才能产生第二个果实。
这是我的代码：
from tkinter import *
import time
from random import randint
score = 0
def create_fruits():
while score < 21:
#choose random fruits with different possibilities
which_fruit = randint(1,11)
#import fuits and bomb images
global this_fruit
if which_fruit == 1 or which_fruit == 10 or which_fruit == 11:
this_fruit = PhotoImage(file = "bomb.png")
elif which_fruit == 2:
this_fruit = PhotoImage(file = "apple.png")
elif which_fruit == 3:
this_fruit = PhotoImage(file = "banana.png")
elif which_fruit == 4:
this_fruit = PhotoImage(file = "cherry.png")
elif which_fruit == 5:
this_fruit = PhotoImage(file = "blueberry.png")
elif which_fruit == 6:
this_fruit = PhotoImage(file = "pear.png")
elif which_fruit == 7:
this_fruit = PhotoImage(file = "lemon.png")
elif which_fruit == 8:
this_fruit = PhotoImage(file = "watermelon.png")
elif which_fruit == 9:
this_fruit = PhotoImage(file = "mango.png")
#randomly generate which colum (four in total) the fruits will be
choose_position = randint (1,4)
global x_position
if choose_position == 1:
x_position = 112.5
elif choose_position == 2:
x_position = 287.5
elif choose_position == 3:
x_position = 462.5
else:
x_position = 637.5
#place the fruit image on the canvas
global my_photo
my_photo = canvas.create_image (x_position,0, image = this_fruit, anchor = 's')
x_volocity = 0
y_volocity = randint (5,10)
while True:
coords = canvas.coords(my_photo) #get coordinates of the fruit picture
print (coords)
#move the fruit
canvas.move (my_photo,x_volocity,y_volocity)
canvas.update()
time.sleep(0.01)
if coords [1] >= 400:
create_fruits()
#create game area
root = Tk ()
canvas = Canvas (root, height = 1200, width = 800, bg = 'black')
#canvas.create_image(0,0, image = bg_image, anchor = 'nw')
canvas.pack()
create_fruits()
mainloop()
这是我尝试过的另一个版本：(比如将第二个水果分配给一个新变量，然后调用递归(。结果是，一旦第一个水果到达该点，程序就会崩溃(就像没有响应一样(。
from tkinter import *
import time
from random import randint
score = 0
def create_fruits():
while score < 21:
#choose random fruits with different possibilities
which_fruit = randint(1,11)
#import fuits and bomb images
global this_fruit
if which_fruit == 1 or which_fruit == 10 or which_fruit == 11:
this_fruit = PhotoImage(file = "bomb.png")
elif which_fruit == 2:
this_fruit = PhotoImage(file = "apple.png")
elif which_fruit == 3:
this_fruit = PhotoImage(file = "banana.png")
elif which_fruit == 4:
this_fruit = PhotoImage(file = "cherry.png")
elif which_fruit == 5:
this_fruit = PhotoImage(file = "blueberry.png")
elif which_fruit == 6:
this_fruit = PhotoImage(file = "pear.png")
elif which_fruit == 7:
this_fruit = PhotoImage(file = "lemon.png")
elif which_fruit == 8:
this_fruit = PhotoImage(file = "watermelon.png")
elif which_fruit == 9:
this_fruit = PhotoImage(file = "mango.png")
#randomly generate which colum (four in total) the fruits will be
choose_position = randint (1,4)
global x_position
if choose_position == 1:
x_position = 112.5
elif choose_position == 2:
x_position = 287.5
elif choose_position == 3:
x_position = 462.5
else:
x_position = 637.5
#place the fruit image on the canvas
global my_photo
my_photo = canvas.create_image (x_position,0, image = this_fruit, anchor = 's')
x_volocity = 0
y_volocity = randint (5,10)
while True:
coords = canvas.coords(my_photo) #get coordinates of the fruit picture
print (coords)
#move the fruit
canvas.move (my_photo,x_volocity,y_volocity)
canvas.update()
time.sleep(0.01)
if coords [1] >= 400:
create_fruits()
#choose random fruits with different possibilities
which_fruit2 = randint(1,11)
#import fuits and bomb images
global this_fruit2
if which_fruit2 == 1 or which_fruit2 == 10 or which_fruit2 == 11:
this_fruit2 = PhotoImage(file = "bomb.png")
elif which_fruit == 2:
this_fruit2 = PhotoImage(file = "apple.png")
elif which_fruit == 3:
this_fruit2 = PhotoImage(file = "banana.png")
elif which_fruit == 4:
this_fruit2 = PhotoImage(file = "cherry.png")
elif which_fruit == 5:
this_fruit2 = PhotoImage(file = "blueberry.png")
elif which_fruit == 6:
this_fruit2 = PhotoImage(file = "pear.png")
elif which_fruit == 7:
this_fruit2 = PhotoImage(file = "lemon.png")
elif which_fruit == 8:
this_fruit2 = PhotoImage(file = "watermelon.png")
elif which_fruit == 9:
this_fruit2 = PhotoImage(file = "mango.png")
#randomly generate which colum (four in total) the fruits will be
choose_position2 = randint (1,4)
global x_position2
if choose_position2 == 1:
x_position = 112.5
elif choose_position2 == 2:
x_position2 = 287.5
elif choose_position2 == 3:
x_position2 = 462.5
else:
x_position2 = 637.5
#place the fruit image on the canvas
global my_photo2
my_photo2 = canvas.create_image (x_position2,0, image = this_fruit2, anchor = 's')
x_volocity2 = 0
y_volocity2 = randint (5,10)
while True:
coords2 = canvas.coords(my_photo2) #get coordinates of the fruit picture
print (coords2)
#move the fruit
canvas.move (my_photo2,x_volocity2,y_volocity2)
canvas.update()
time.sleep(0.01)
if coords2 >= 400:
create_fruits()
#create game area
root = Tk ()
canvas = Canvas (root, height = 1200, width = 800, bg = 'black')
#canvas.create_image(0,0, image = bg_image, anchor = 'nw')
canvas.pack()
create_fruits()
mainloop()
这是我的代码的第三个版本(使用after方法(。在代码中，我还尝试使用list来跟踪水果并在之后删除它们，但它似乎不起作用(我不知道为什么(。
#make the fruits appear on the screen
def create_fruits():
#choose random fruits with different possibilities
which_fruit = randint(1,11)
#import fuits and bomb images
global this_fruit
if which_fruit == 1 or which_fruit == 10 or which_fruit == 11:
this_fruit = PhotoImage(file = "bomb.png")
elif which_fruit == 2:
this_fruit = PhotoImage(file = "apple.png")
elif which_fruit == 3:
this_fruit = PhotoImage(file = "banana.png")
elif which_fruit == 4:
this_fruit = PhotoImage(file = "cherry.png")
elif which_fruit == 5:
this_fruit = PhotoImage(file = "blueberry.png")
elif which_fruit == 6:
this_fruit = PhotoImage(file = "pear.png")
elif which_fruit == 7:
this_fruit = PhotoImage(file = "lemon.png")
elif which_fruit == 8:
this_fruit = PhotoImage(file = "watermelon.png")
elif which_fruit == 9:
this_fruit = PhotoImage(file = "mango.png")
#randomly generate which colum (four in total) the fruits will be
choose_position = randint (1,4)
global x_position
if choose_position == 1:
x_position = 112.5
elif choose_position == 2:
x_position = 287.5
elif choose_position == 3:
x_position = 462.5
else:
x_position = 637.5
#create a list to store fruit images
global fruits_list
fruits_list = []
#append it to the list
fruits_list.append(this_fruit)
#place the fruit image on the canvas
global my_photo
my_photo = canvas.create_image (x_position,0, image = this_fruit, anchor = 's')
#global root
#repeatedly generate fruit images every 3 second
root.after(3000,create_fruits)
#nake fruits' animation
#let one fruit keep moving while the second fruit pears
def move_fruits():
#set the moving speed
x_volocity = 0
y_volocity = randint (5,10)
#try to make two fruits moving at the same time on the screen
for i in range (0,len(fruits_list)-1):
while True:
coords = canvas.coords(fruits_list[i]) #get coordinates of the fruit picture
print (coords)
#move the fruit
canvas.move (fruits_list[i],x_volocity,y_volocity)
canvas.update()
time.sleep(0.01)
#assign this fruit to finished fruit to delete it from the list later
finished_fruit = fruits_list[i]
#check is the fruit is outside of the boarder, if so, delete if from the list and countinue on the second fruit
if coords [i] >= 1400:
fruits_list.remove(finished_fruit)
我对您的代码做了一些更改，包括删除不必要的if语句(而是将其存储在dict中(和删除无限while循环。
from tkinter import *
from random import randint
from PIL import Image, ImageTk
#make the fruits appear on the screen
def create_fruits():
global fruits_list
#choose random fruits with different possibilities
which_fruit = randint(1,3)
this_fruit = ImageTk.PhotoImage(Image.open(fruit_dic[which_fruit]))
#randomly generate which colum (four in total) the fruits will be
choose_position = randint (1,4)
x_position = x_positions_dic[choose_position] # choose the position from dict
my_photo = canvas.create_image(x_position, 80, image = this_fruit, anchor = 's')
#append it to the list(image_id, x position, image)
fruits_list.append([my_photo, randint(5,10), this_fruit])
#repeatedly generate fruit images every 3 second
root.after(3000,create_fruits)
def move_fruits():
for fruit in fruits_list:
canvas.move(fruit[0], 0, fruit[1])
if canvas.bbox(fruit[0])[3] >= canvas.winfo_height()+100:
canvas.delete(fruit[0])
fruits_list.remove(fruit)
root.after(10, move_fruits) # calls the move_fruits after every 10 seconds
root = Tk()
canvas = Canvas (root, height = 1200, width = 800, bg = 'black')
canvas.pack()
fruits_list = []
x_positions_dic = {1: 112.5, 2: 287.5, 3: 462.5, 4:637.5}
fruit_dic = {1: r"imagfruit1" , 2: r"imgfruit2" , 3: r"imgfruit3"} # your path here
create_fruits()
move_fruits()
root.mainloop()