當按下鍵盤上的按鈕時，如何使方塊移動？Tkinter，Python

按鍵盤上的“d”按鈕（例如）時如何使方塊移動？

from tkinter import *
root = Tk()
root.title('Snake')
root["width"] = 400
root["height"] = 400

field = Canvas(root)

x = 0
y = 0

def snake(x, y):
    field.create_rectangle(10, 20, 30, 40)
    field.grid(row=x, column=y)
    x  = 1
    y  = 1
    return(x, y)


root.bind("<KeyPress>", snake(x=x, y=y))

root.mainloop()

uj5u.com熱心網友回復：

一個簡單的方法是使用event.char. 它回傳按下按鈕的字符。然后檢查它是哪個按鈕并移動它如果它是w,a,s,d-

from tkinter import *
root = Tk()
root.title('Snake')
root["width"] = 400
root["height"] = 400

field = Canvas(root)
rect = field.create_rectangle(10, 20, 30, 40)
field.grid(row=0, column=0)

def snake(event):
    x = 0 # Default
    y = 0
    if event.char == 'w':
        y = -10

    if event.char == 'a':
        x = -10

    if event.char == 's':
        y = 10
    
    if event.char == 'd':
        x = 10

    field.move(rect,x,y)


root.bind("<Key>", snake)
root.mainloop()

uj5u.com熱心網友回復：

這是您可以做到的一種方式：

import tkinter as tk
from tkinter import Canvas

root = tk.Tk()
root.title('Snake')
root.geometry("450x450")

w = 400
h = 400
x = w//2
y = h//2

field = Canvas(root, width=w, heigh=h, bg="white")
field.pack(pady=5)

my_rectangle = field.create_rectangle(10, 20, 30, 40)


def left(event):
    x = -10
    y = 0
    field.move(my_rectangle, x, y)


def right(event):
    x = 10
    y = 0
    field.move(my_rectangle, x, y)


def up(event):
    x = 0
    y = -10
    field.move(my_rectangle, x, y)


def down(event):
    x = 0
    y = 10
    field.move(my_rectangle, x, y)


root.bind("<Left>", left)
root.bind("<Right>", right)
root.bind("<Up>", up)
root.bind("<Down>", down)

root.mainloop()

首先創建root，然后給geometry它，在這種情況下它是450x450。之后創建將存盤height和width，和的變數coordinates x and y。然后，創建canvas（field），并canvas指定canvas將位于和geometry的canvas（和background color）。當canvas被創建，我們創造rectangle。函式left, right, up and down將涵蓋rectangle畫布上的移動。field.move(my_rectangle, x, y)- 這行代碼將 my_rectangle 在畫布上移動 x 和 y，或者向左、向右或向上移動，這取決于傳遞的內容。root.bind("<Left>", left)- 將左箭頭鍵系結到left function. 這就是為什么event是parameter的fucntion。

uj5u.com熱心網友回復：

另一種方法

from tkinter import *
root = Tk()
root.title('Snake')
root["width"] = 400
root["height"] = 400

field = Canvas(root)

SIZE = 50

class Snake:
    def __init__(self,x,y,canvas):
        self.x = x
        self.y = y
        self.canvas = canvas
        self.direction = (SIZE,0)
    def keypress(self,event):
        if event.keysym == 'Right':
            self.direction = (SIZE,0)
        if event.keysym == 'Left':
            self.direction = (-SIZE,0)
        if event.keysym == 'Up':
            self.direction = (0,-SIZE)
        if event.keysym == 'Down':
            self.direction = (0,SIZE)

    def move(self):
        self.x  = self.direction[0]
        self.y  = self.direction[1]
            
            
            
    def redraw(self):
        self.canvas.delete('snake')
        self.move()
        self.canvas.create_rectangle(self.x,self.y,self.x SIZE,self.y SIZE,fill="green",tag="snake")
        

def update_screen():
    snake.redraw()
    root.after(1000,update_screen)

snake = Snake(0,0,field)


root.bind("<KeyPress>", lambda event: snake.keypress(event))
root.after_idle(update_screen)
field.grid()
root.mainloop()

這為蛇使用了一個物件，其中包含對按鍵做出反應并重繪蛇的方法。這將洗掉現有的矩形并繪制新的矩形而不是移動（可能證明對于顯示不同的蛇段更有用）。

這種方法的優點是，無論用戶是否按下按鈕，都可以使蛇移動。如果沒有按下任何按鈕，蛇將繼續朝同一方向前進。

一旦你有一個更復雜的游戲，我希望你的 Snake 類包含每次繪制的不同蛇段的串列。當蛇移動到水果上時，會添加一個新段。請參閱下面的多節移動蛇

from tkinter import *
root = Tk()
root.title('Snake')
root["width"] = 400
root["height"] = 400

field = Canvas(root)

SIZE = 10

class Snake:
    def __init__(self,x,y,canvas):
        self.x = x
        self.y = y
        self.canvas = canvas
        self.direction = (SIZE,0)
        self.segments = [(self.x,self.y)]
        self.length = 5
    def keypress(self,event):
        if event.keysym == 'Right':
            self.direction = (SIZE,0)
        if event.keysym == 'Left':
            self.direction = (-SIZE,0)
        if event.keysym == 'Up':
            self.direction = (0,-SIZE)
        if event.keysym == 'Down':
            self.direction = (0,SIZE)

    def move(self):
        self.x  = self.direction[0]
        self.y  = self.direction[1]
        new_segment = (self.segments[-1][0] self.direction[0],self.segments[-1][1] self.direction[1])
        self.segments.append(new_segment)
        if len(self.segments) > self.length:
            self.segments.pop(0)
            
            
    def redraw(self):
        self.canvas.delete('snake')
        self.move()
        for seg in self.segments:
            
            self.canvas.create_rectangle(seg[0],seg[1],seg[0] SIZE,seg[1] SIZE,fill="green",tag="snake")
        #self.canvas.create_rectangle(self.x,self.y,self.x SIZE,self.y SIZE,fill="green",tag="snake")
        

def update_screen():
    snake.redraw()
    root.after(1000,update_screen)

snake = Snake(0,0,field)


root.bind("<KeyPress>", lambda event: snake.keypress(event))
root.after_idle(update_screen)
field.grid()
root.mainloop()

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