Python turtle 程序没有正确绘制多边形

Question

当我运行程序使用海龟工具时，它只是制作一条水平线，并没有制作出完整的形状。我不确定为什么会这样。我已经制作了一个可以绘制预定形状（例如正方形）的工作程序。我已经测试了我的计算，我相信我的 for 循环是正确的。我是不是犯了一些愚蠢的语法错误？

# polygon program

# get inputs
side_count = int(input( "How many sides does the polygon have?" ))
side_length = int(input( "How long is each side?" ))

# compute side angle
shape_angle = (side_count - 2) * 180

# import turtle modules
from turtle import *

# measure angles in
degrees()

# drawing speed
speed( 6 )

# square specs
color( 'green' )
width( 3 )
setheading( 0 )

# forloop to draw the polygon
for side in range ( side_count ):
    forward ( side_length ) 
    left ( shape_angle )

# all done drawing
done()

Answer 1

首先，先导入你所有的模块，除非你必须使用它，否则没有必要，但这是一个好习惯。 shape_angle 也是整个形状的总和。要使其正常工作，您需要原始代码：

shape_angle = (side_count - 2) * 180

然后放在括号里除以side_count求出个体角度，结果：

shape_angle = ((side_count - 2) * 180) / side_count

同时去掉 degrees

import turtle as *
side_count = int(input( "How many sides does the polygon have?" ))
side_length = int(input( "How long is each side?" ))
shape_angle = ((side_count - 2) * 180) / side_count
speed( 6 )
color( 'green' )
width( 3 )
setheading( 0 )
for side in range ( side_count ):
    forward ( side_length ) 
    left ( shape_angle )
done()

`

Answer 2

尽管我同意@TudorPopescu 的观点，这条线是您的主要问题：

shape_angle = (side_count - 2) * 180

该解决方案对我不起作用，所以我建议从更简单的开始：

shape_angle = 360 / side_count

您的代码已通过上述修复和样式更改进行了修改：

# polygon program

# import turtle modules
from turtle import *

# get inputs
side_count = int(input("How many sides does the polygon have? "))
side_length = int(input("How long is each side? "))

# compute side angle
shape_angle = 360 / side_count

# measure angles in
degrees()  # the default

# drawing speed
speed('normal')  # the default

# square specs
color('green')
width(3)
setheading(0)  # the default initial heading

# for loop to draw the polygon
for side in range(side_count):
    forward(side_length)
    left(shape_angle)

# all done drawing
done()

Python turtle 程序没有正确绘制多边形

Python turtle program not drawing polygon properly

turtle-graphics

python-3.x