python - 有没有办法检查多边形是否完全闭合？

Question

我正在尝试绘制一个红色的 parking 标志，轮廓为白色。但是，我似乎无法弄清楚为什么红色八边形没有填充。

如果八边形仍然打开，这就是它没有填充的原因吗？如果是，我如何检查它是否打开？

import turtle
turtle.bgcolor("black")
turtle.penup()
turtle.goto(-104,-229)
# Draws white octagon outline
for i in range(8):
    turtle.pensize(10)
    turtle.color("white")    
    turtle.pendown()
    turtle.forward(193)
    turtle.right(5)
    turtle.left(50)

# Draws red octagon
turtle.penup()
turtle.goto(-100,-220)
for i in range(8):
    turtle.pensize(10)
    turtle.color("red")
    turtle.fillcolor("red")
    turtle.begin_fill()    
    turtle.pendown()
    turtle.forward(185)
    turtle.right(5)
    turtle.left(50)
    turtle.end_fill()

# Writes "STOP"
turtle.penup()   
turtle.goto(5,-50)
turtle.setheading(360 / 8 / 2)
turtle.pendown()
turtle.stamp()  
turtle.pencolor("white")
turtle.shapesize(0.9)
turtle.stamp()
turtle.shapesize(1.0)
turtle.write("STOP", align="center", font=("Arial",110,"normal"))   
turtle.done()

Answer 1

您需要将开始和结束填充放在循环之外，因为它一次只会填充一行

# Draws red octagon
turtle.penup()
turtle.goto(-100,-220)
turtle.pensize(10)
turtle.color("red")
turtle.fillcolor("red")
turtle.begin_fill()
for i in range(8):
    turtle.pendown()
    turtle.forward(185)
    turtle.right(5)
    turtle.left(50)
turtle.end_fill()