在 python tkinter canvas 中移动对象

Question

所以我有一艘潜艇：

from tkinter import *
HEIGHT = 500
WIDTH = 800
window = Tk()
window.title("Bubble Blaster")
c = Canvas(window, width=WIDTH, height=HEIGHT, bg="darkblue")
c.pack()
ship_id = c.create_polygon(5, 5, 5, 25, 30, 15, fill="red")
ship_id2 = c.create_oval(0, 0, 30, 30, outline="red")

我正在看一本关于如何让潜艇移动的书，书上是这样写的：

def move_ship(event):
    if event.keysym == "up":
        c.move(ship_id, 0, -ship_spd)
        c.move(ship_id2, 0, -ship_spd)
    elif event.keysym == "Down":
        c.move(ship_id, 0, ship_spd)
        c.move(ship_id2, 0, ship_spd)
    elif event.keysym == "Left":
        c.move(ship_id, -ship_spd, 0)
        c.move(ship_id2,  -ship_spd, 0)
    elif event.keysym == "Right":
        c.move(ship_id, ship_spd, 0)
        c.move(ship_id2,  ship_spd, 0)
    c.bind_all('<key', move_ship)

当我运行它时，它给我一个错误：
PS。我在片段中这样做是因为 Ctrl+v 不会完成所有消息

<h4 style="color: red">Traceback (most recent call last):
  File "C:\Users\Bloxy Craft\Desktop\Bubble Blaster.py", line 28, in &lt;module&gt;
    c.bind_all('&lt;key&gt;', move_ship)
  File "C:\Users\Bloxy Craft\AppData\Local\Programs\Python\Python36\lib\tkinter\__init__.py", line 1257, in bind_all
    return self._bind(('bind', 'all'), sequence, func, add, 0)
  File "C:\Users\Bloxy Craft\AppData\Local\Programs\Python\Python36\lib\tkinter\__init__.py", line 1200, in _bind
    self.tk.call(what + (sequence, cmd))
_tkinter.TclError: bad event type or keysym "key"</h4>

有人可以帮助我吗？
谢谢！
- Bloxy 工艺品

Answer 1

就像 Bryan Oakley 说的，您需要将 '<key' 替换为 '<Key>'。您还需要在代码中将 if event.keysym == "up": 替换为 if event.keysym == "Up":（'Up' 中的 U 必须大写）。孔码为：

from tkinter import *
HEIGHT = 500
WIDTH = 800
window = Tk()
window.title("Bubble Blaster")
c = Canvas(window, width=WIDTH, height=HEIGHT, bg="darkblue")
c.pack()
ship_id = c.create_polygon(5, 5, 5, 25, 30, 15, fill="red")
ship_id2 = c.create_oval(0, 0, 30, 30, outline="red")

def move_ship(event):
    if event.keysym == "Up":
        c.move(ship_id, 0, -ship_spd)
        c.move(ship_id2, 0, -ship_spd)
    elif event.keysym == "Down":
        c.move(ship_id, 0, ship_spd)
        c.move(ship_id2, 0, ship_spd)
    elif event.keysym == "Left":
        c.move(ship_id, -ship_spd, 0)
        c.move(ship_id2,  -ship_spd, 0)
    elif event.keysym == "Right":
        c.move(ship_id, ship_spd, 0)
        c.move(ship_id2,  ship_spd, 0)

c.bind_all('<Key>', move_ship)

在 python tkinter canvas 中移动对象

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