如何使用我的按钮在模式之间切换

Question

我创建了 2 种绘图模式，但它们同时绘图，但我希望它们单独工作，所以我创建了一个按钮，但不知道如何定义模式更改以使按钮工作

如何定义我的模式更改，以便我可以在不同的绘图模式之间进行更改，例如徒手模式、圆形模式，这样它们就不会同时工作

from turtle import Screen, Turtle

beni=Screen()
beni.setup(400, 400, 10, 10)
beni.setworldcoordinates(-300, -300, 300, 300)

def mode_change(x, y):



#freehandmode
def freehandmode(x, y):
    t.ondrag(None)
    t.setheading(t.towards(x, y))
    t.goto(x, y)
    t.ondrag(freehandmode)



#circlemode
def draw_circle(x, y):
    beni.onclick(None)
    center = turtle.position()
    turtle.setposition(x, y)
    turtle.setheading(turtle.towards(center) - 90)
    turtle.pendown()
    turtle.circle(turtle.distance(center))
    turtle.penup()
    turtle.clearstamps()
    beni.onclick(pick_center)

def pick_center(x, y):
    beni.onclick(None)
    turtle.setposition(x, y)
    turtle.stamp()
    beni.onclick(draw_circle)

turtle = Turtle()
turtle.hideturtle()
turtle.shape('circle')
turtle.shapesize(0.5)
turtle.penup()

beni.onclick(pick_center)


#freehand turtle
t = Turtle('circle')
t.shapesize(1)
t.speed('fastest')
t.ondrag(freehandmode)

#modechange turtle
modechange = Turtle('circle')
modechange.pu()
modechange.shapesize(0.55, 1.45)
modechange.color('black')
modechange.setpos(0, 290)
modechange.onclick(mode_change)

#modebutton
modebutton = Turtle()
modebutton.shapesize(0.25)
modebutton.pu()
modebutton.setpos(-20, 300)
modebutton.setheading(270)
modebutton.pd()
modebutton.fd(20)
modebutton.setheading(0)
modebutton.fd(45)
modebutton.setheading(90)
modebutton.fd(20)
modebutton.setheading(180)
modebutton.fd(45)
modebutton.pu()
modebutton.setpos(-10, 263)
modebutton.setheading(0)
modebutton.color('green')
modebutton.write('Modi')
modebutton.hideturtle()

beni.mainloop()

Answer 1

这主要是一个会计问题——您需要明确列出每次切换模式时禁用一只海龟和启用另一只海龟所需的步骤。并且您需要跟踪当前模式。这是我对您（实际上，主要是我的）代码的返工和简化：

from turtle import Screen, Turtle, mainloop

def mode_change(x, y):
    global mode

    if mode == 'freehand':
        # disable freehand
        freehand.ondrag(None)
        freehand.hideturtle()

        # enable circle
        screen.ontimer(lambda: screen.onclick(pick_center))  # so screen doesn't inherit *this* click
        mode = 'circle'
    else:
        # disable circle
        screen.onclick(None)

        # enable freehand
        freehand.ondrag(freehandmode)
        freehand.showturtle()
        mode = 'freehand'

# freehand mode
def freehandmode(x, y):
    freehand.ondrag(None)

    freehand.setheading(freehand.towards(x, y))
    freehand.goto(x, y)

    freehand.ondrag(freehandmode)

# circle mode
def draw_circle(x, y):
    screen.onclick(None)

    center = circle.position()
    circle.setposition(x, y)
    circle.setheading(circle.towards(center) - 90)
    circle.pendown()
    circle.circle(circle.distance(center))
    circle.penup()
    circle.clearstamps()

    screen.onclick(pick_center)

def pick_center(x, y):
    screen.onclick(None)

    circle.setposition(x, y)
    circle.stamp()

    screen.onclick(draw_circle)

screen = Screen()
screen.setup(400, 400)

mode = 'freehand'

circle = Turtle('circle', visible=False)
circle.shapesize(0.5)
circle.speed('fastest')
circle.penup()

freehand = Turtle('circle')
freehand.speed('fastest')
freehand.ondrag(freehandmode)

# modechange turtle
modechange = Turtle('square')
modechange.penup()
modechange.setposition(0, 155)
modechange.pencolor('green')
modechange.write('Modi', align='center')

modechange.shapesize(2.25, 1.0)
modechange.setposition(0, 190)
modechange.onclick(mode_change)

mainloop()