【发布时间】：2020-11-20 08:11:59
【问题描述】：
目前我正在尝试摆脱左手算法中的 while 循环。之所以要删除它，是因为我阅读了 2 个堆栈帖子 here 和 here。两者都由@cdlane 回答，他删除了while 循环并重建了一个新函数。我真的很感谢这位先生，他帮助解决了我以前遇到的很多问题。我知道这背后的原因是因为 while 循环阻止代码到达 mainloop() 方法。我在帖子中看到了该答案作为替代，但是我该如何修改它，因为在这种情况下，我的不是乌龟onkey 事件，而是当我调用受乌龟影响的类时要调用的函数标题。
这是我的算法：
from turtle import * # import the turtle library
# define the tile_size and cursor_size for usage later on
TILE_SIZE = 24
CURSOR_SIZE = 20
class Wall(Turtle): # create Wall class to plot out the walls
def __init__(self):
super().__init__(shape='square') # inherit from Turtle(parent class)
self.hideturtle() # hide the cursor
self.shapesize(TILE_SIZE / CURSOR_SIZE) # define the size of the square
self.pencolor('black') # define the color that we are going to plot the grids out
self.penup() # to prevent the pen from leaving a trace
self.speed('fastest') # get the fastest speed
class Path(Wall): # create Path class to plot out the path
def __init__(self):
super().__init__() # inherit from Turtle(parent class)
self.pencolor('white') # define the color that we are going to plot the grids out
class Sprite(Turtle): # create Sprite class to define the turtle and its characteristics
def __init__(self):
super().__init__(shape='turtle') # inherit from Turtle(parent class)
self.shapesize((TILE_SIZE / CURSOR_SIZE)-0.4) # define the size of the square
self.color('orange') # define the color that we are going to plot the turtle
self.penup() # to prevent the pen from leaving a trace while shifting to the starting point
self.goto(start_x, start_y) # move the turtle to the position
self.speed('fastest') # set speed to slowest to observe the sprite movement
############## algorithms and manual movement here ######################
class LeftHandAlgorithm(Sprite): # create LeftHandAlgorithm class to define how the sprite moves with LHA
def __init__(self):
super().__init__() # inherit from the Sprite class
# self.hideturtle() # hide the cursor
self.moves = 0 # create a counter to count the number of steps
self.goto(start_x, start_y) # move the turtle to the position
self.pendown()
def spriteUp(self): # create a spriteUp function to control the turtle if it wants to move downwards
if (self.heading() == 90): # see if sprite is facing downwards
x_walls = round(self.xcor(), 0) # sprite x coordinates
y_walls = round(self.ycor(), 0) # sprite y coordinates
if (x_walls, y_walls) in finish: # check if coordinates is ald at finish point
print('Finished Left Hand Algorithm!')
endProgram() # exit the entire program upon clicking anywhere in the turtle window
if ((x_walls - 24), y_walls) in walls: # check if the walls are on the left
if (x_walls, (y_walls + 24)) not in walls: # check if the path ahead it is facing is clear
self.forward(24) # move forward by 1 step
else:
self.right(90) # if it is blocked, turn 90 clockwise right
else:
self.left(90) # turn 90 deg left
self.forward(24) # move forward by 1 step
def spriteDown(self): # create a spriteUp function to control the turtle if it wants to move upwards
if (self.heading() == 270): # see if sprite is facing downwards
x_walls = round(self.xcor(), 0) # sprite x coordinates
y_walls = round(self.ycor(), 0) # sprite y coordinates
if (x_walls, y_walls) in finish: # check if coordinates is ald at finish point
print('Finished Left Hand Algorithm!')
endProgram() # exit the entire program upon clicking anywhere in the turtle window
if ((x_walls + 24), y_walls) in walls: # check if the walls are on the left
if (x_walls, (y_walls - 24)) not in walls: # check if the path ahead it is facing is clear
self.forward(24) # move forward by 1 step
else:
self.right(90) # if it is blocked, turn 90 clockwise right
else:
self.left(90) # turn 90 deg left
self.forward(24) # move forward by 1 step
def spriteLeft(self): # create a spriteUp function to control the turtle if it wants to move leftwards
if (self.heading() == 180): # see if sprite is facing downwards
x_walls = round(self.xcor(), 0) # sprite x coordinates
y_walls = round(self.ycor(), 0) # sprite y coordinates
if (x_walls, y_walls) in finish: # check if coordinates is ald at finish point
print('Finished Left Hand Algorithm!')
endProgram() # exit the entire program upon clicking anywhere in the turtle window
if (x_walls, (y_walls - 24)) in walls: # check if the walls are on the left
if ((x_walls - 24), y_walls) not in walls: # check if the path ahead it is facing is clear
self.forward(24) # move forward by 1 step
else:
self.right(90) # if it is blocked, turn 90 clockwise right
else:
self.left(90) # turn 90 deg left
self.forward(24) # move forward by 1 step
def spriteRight(self): # create a spriteUp function to control the turtle if it wants to move rightside
if (self.heading() == 0): # see if sprite is facing downwards
x_walls = round(self.xcor(), 0) # sprite x coordinates
y_walls = round(self.ycor(), 0) # sprite y coordinates
if (x_walls, y_walls) in finish: # check if coordinates is ald at finish point
print('Finished Left Hand Algorithm!')
endProgram() # exit the entire program upon clicking anywhere in the turtle window
if (x_walls, (y_walls + 24)) in walls: # check if the walls are on the left
if ((x_walls + 24), y_walls) not in walls: # check if the path ahead it is facing is clear
self.forward(24) # move forward by 1 step
else:
self.right(90) # if it is blocked, turn 90 clockwise right
else:
self.left(90) # turn 90 deg left
self.forward(24) # move forward by 1 step
def setup_maze(level): # create a setup_maze function so that we can plot out the map in turtle
# declare maze_height and maze_width first as the limits for the entire maze
maze_height, maze_width = len(level), len(level[0])
# get the center point for each maze
center_horizontal_point = (maze_width + 1) / 2
center_vertical_point = (maze_height + 1) / 2
for y in range(maze_height): # for loop to limit the entire maze
for x in range(maze_width):
character = level[y][x] # get the character at each x,y coordinate
# calculate the screen x, y coordinates
screen_x = int((x - maze_width) * TILE_SIZE) + (center_horizontal_point * TILE_SIZE)
screen_y = int((maze_height - y) * TILE_SIZE) - (center_vertical_point * TILE_SIZE)
if character == "X":
maze.fillcolor('grey')
maze.goto(screen_x, screen_y)
maze.stamp()
walls.append((screen_x, screen_y)) # add coordinates for the wall to the list
else:
maze.fillcolor('white')
maze.goto(screen_x, screen_y)
maze.stamp()
paths.append((screen_x, screen_y)) # add coordinates for the path to the list
if character == "e":
maze.fillcolor(['white', 'red'][character == 'e'])
maze.goto(screen_x, screen_y) # proceed on to the coordinates on turtle
maze.stamp() # stamp out the boxes
finish.append((screen_x, screen_y)) # add coordinates for the endpoint to the list
if character == 's': # if statement to determine if the character is s
maze.fillcolor('green')
maze.goto(screen_x, screen_y)
maze.stamp() # stamp out the boxes
start.append((screen_x, screen_y)) # add coordinates for the startpoint to the list
def endProgram(): # exit the entire program upon clicking anywhere in the turtle window
screen.exitonclick()
grid = [] # create a grid list to store the labels while reading from the txt file
walls = [] # create walls coordinate list
start = []
finish = [] # enable the finish array
paths = []
with open("map11.txt") as file: # open the txt file and read contents and append it to maze
for line in file:
grid.append(line.strip())
screen = Screen() # instantiate the Screen class from turtle
screen.setup(700, 700) # determine the size of the turtle pop out window
maze = Wall() # enable the Wall class
path = Path() # enable the Path class
setup_maze(grid)
start_x, start_y = int((start[0])[0]), int((start[0])[1])
spriteLHA = LeftHandAlgorithm() # enable the Sprite class for Left Hand Algorithm
while True:
spriteLHA.spriteUp()
spriteLHA.spriteDown()
spriteLHA.spriteLeft()
spriteLHA.spriteRight()
screen.listen()
screen.mainloop()
【问题讨论】：
标签： python python-3.x python-turtle