Question

我想知道是否有一种方法可以制作像shape_color = ['red', 'blue', 'green']这样的颜色列表，并将该列表分配给单个按键功能按钮，这样每当我按下该按钮时，它会循环显示该列表颜色和改变海龟的颜色？该程序基本上是在Turtle Grapgics中，您可以在其中移动光标，并在屏幕上标记不同的形状。

Answer 1

shape_color = ['red', 'blue', 'green'] # list of colors
idx = 0 # index for color list

# Callback for changing color
def changecolor():
    idx = (idx+1) % len(shape_color) # Increment the index within the list bounds
    fillcolor(shape_color[idx]) # Change the fill color

# Register the callback with a keypress.
screen.onkey(changecolor, "c")

现在，每当您按下c键时，填充颜色都会发生变化，循环显示您定义的列表。

Answer 2

@jfs对@Aesthete示例的完整修复版本：

from turtle import Screen, Turtle
from itertools import cycle

shape_colors = ['red', 'blue', 'green', 'cyan', 'magenta', 'yellow', 'black']

def change_color(colors=cycle(shape_colors)):
    turtle.color(next(colors))

turtle = Turtle('turtle')
turtle.shapesize(5)  # large turtle for demonstration purposes

screen = Screen()
screen.onkey(change_color, 'c')
screen.listen()
screen.mainloop()

Python-如何通过列表更改Turtle中的形状颜色

2 个答案: