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.
以上是如何在 Turtle Graphics 中绑定多个按键以执行复杂的操作？的详细内容。更多信息请关注PHP中文网其他相关文章！
