如何在海龟图形中将多个按键绑定在一起? [英] How to bind several key presses together in turtle graphics?

问题描述

我正在尝试制作一个connect-the-dot python 游戏.我希望游戏注册 2 个按钮按下.示例:如果用户按下向上和向右箭头键，海龟将向东北方向移动 45 度.

I'm trying to make a connect-the-dot python game. I want the game to register 2 button presses. Example: if the user presses Up and Right arrow key, the turtle goes 45 degrees north east.

这是我的代码:

import turtle

flynn=turtle.Turtle()
win=turtle.Screen()
win.bgcolor("LightBlue")
flynn.pensize(7)
flynn.pencolor("lightBlue")

win.listen()

def Up():
    flynn.setheading(90)
    flynn.forward(25)

def Down():
    flynn.setheading(270)
    flynn.forward(20)

def Left():
    flynn.setheading(180)
    flynn.forward(20)

def Right():
    flynn.setheading(0)
    flynn.forward(20)

def upright():
    flynn.setheading(45)
    flynn.forward(20)

win.onkey(Up, "Up")
win.onkey(Down,"Down")
win.onkey(Left,"Left")
win.onkey(Right,"Right")

推荐答案

我怀疑你能否在 onkeypress() 和 onkeyrelease() 之间干净地解决这个协调变量> 事件.(虽然我很乐意以其他方式显示.)我提供了一种替代方法，其中按键简单地发布移动请求，并且计时器应用这些请求，无论是单独的还是加倍的:

I'm skeptical that you can cleanly solve this coordinating variables between onkeypress() and onkeyrelease() events. (Though I'd be pleased to be shown otherwise.) I offer an alternate approach where key presses simply post move requests and a timer applies those requests, whether individual or doubled up:

from turtle import Turtle, Screen

win = Screen()

flynn = Turtle('turtle')

def process_events():
    events = tuple(sorted(key_events))

    if events and events in key_event_handlers:
        (key_event_handlers[events])()

    key_events.clear()

    win.ontimer(process_events, 200)

def Up():
    key_events.add('UP')

def Down():
    key_events.add('DOWN')

def Left():
    key_events.add('LEFT')

def Right():
    key_events.add('RIGHT')

def move_up():
    flynn.setheading(90)
    flynn.forward(25)

def move_down():
    flynn.setheading(270)
    flynn.forward(20)

def move_left():
    flynn.setheading(180)
    flynn.forward(20)

def move_right():
    flynn.setheading(0)
    flynn.forward(20)

def move_up_right():
    flynn.setheading(45)
    flynn.forward(20)

def move_down_right():
    flynn.setheading(-45)
    flynn.forward(20)

def move_up_left():
    flynn.setheading(135)
    flynn.forward(20)

def move_down_left():
    flynn.setheading(225)
    flynn.forward(20)

key_event_handlers = { \
    ('UP',): move_up, \
    ('DOWN',): move_down, \
    ('LEFT',): move_left, \
    ('RIGHT',): move_right, \
    ('RIGHT', 'UP'): move_up_right, \
    ('DOWN', 'RIGHT'): move_down_right, \
    ('LEFT', 'UP'): move_up_left, \
    ('DOWN', 'LEFT'): move_down_left, \
}

key_events = set()

win.onkey(Up, "Up")
win.onkey(Down, "Down")
win.onkey(Left, "Left")
win.onkey(Right, "Right")

win.listen()

process_events()

win.mainloop()

这可能需要根据您的特定需求进行一些微调.(例如，您如何在 key_events 中处理两个以上的事件).

This might take some fine tuning depending on your particular needs. (E.g. how you handle more than two events in key_events).

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