当我按-和+键时,笔的大小保持不变,就像我用海龟画画一样。你知道吗
我用一些似是而非的答案重新解决了这个问题,但没有用。我在网上寻找类似的解决方案,结果空手而归。你知道吗
import turtle
turtle.setup(400,500) # Determine the window size
wn = turtle.Screen() # Get a reference to the window
wn.title("Handling keypresses!") # Change the window title
wn.bgcolor("lightgreen") # Set the background color
tess = turtle.Turtle() # Create our favorite turtle
# The next four functions are our "event handlers".
def h1():
tess.forward(30)
def h2():
tess.left(45)
def h3():
tess.right(45)
def h4():
tess.color("red")
def h5():
tess.color("green")
def h6():
tess.color("blue")
def h7():
tess.pensize(0)
def h8():
tess.pensize(20)
def h9():
wn.bye() # Close down the turtle window
def h10():
tess.backward(30)
# These lines "wire up" keypresses to the handlers we've defined.
wn.onkey(h1, "Up")
wn.onkey(h2, "Left")
wn.onkey(h3, "Right")
wn.onkey(h4, "r")
wn.onkey(h5, "g")
wn.onkey(h6, "b")
wn.onkey(h7, "-")
wn.onkey(h8, "+")
wn.onkey(h9, "q")
wn.onkey(h10, "Down")
# Now we need to tell the window to start listening for events,
# If any of the keys that we're monitoring is pressed, its
# handler will be called.
wn.listen()
wn.mainloop()
我正在尝试使用turtle中的.pensize()方法,通过使用带有.onkey()方法的-和+键by函数,在0到20的限制范围内增加/减少它的厚度。感谢您的帮助。你知道吗
不需要全局变量来跟踪笔的大小。海龟已经(有效地)成为全球实体,并且知道自己的笔大小(测试代码):
然而,还有另一个问题会使这个或任何解决方案无法正常工作。此代码:
而是需要:
否则,
"-"
符号将导致所有未分配的键(包括键入"+"
所需的shift键)调用h7()
处理程序!此更改还应允许键盘上的等效键工作。完整代码:相关问题 更多 >
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