在 Turtle Graphics 中绑定多个按键
在游戏开发中,协调用户输入需要可靠的按键绑定技术。本文介绍了如何在海龟图形中将多个按键绑定在一起,从而在按下某些组合时启用复杂的操作。
问题陈述:
创建一个连接-点 Python 游戏,其中:
初始方法:
以下代码代表初步尝试:
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")
挑战:
上面的代码不会同时注册多个按键。例如,按向上和向右只会执行按下的第二个键的操作。
替代解决方案:
由于 onkeypress() 的限制,替代方案需要采取方法。在此解决方案中,按键记录在列表中,计时器定期检查注册的组合并执行适当的操作。
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()
该解决方案有效解决了该问题,允许同时注册多个按键.
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