python海龟绘图-画国旗

osc_p5er4r6g 2020-11-13 12:41:02
Python


画之前肯定要知道规格图,我找了一个大致的图。

参考图片:

绘制大星的方法很简单,五角星的补角是144度。

绘制小五角星有点麻烦,因为我国国旗上的小五角星并不是平放的(美帝曾经这样把我们的国旗搞错过),而是总有一个角正对着大五角星的中心!我的方法是,定位到小五角星的中心点,然后根据角度后退一定的长度。这个角度可以根据反勾股定理算出来(这有计算工具),长度我是按照大五角星的中心点到角尖的距离除以3得到的。

代码:

from turtle import *
screensize(2000,2000,'white')#设置画布大小
#绘制旗面
pencolor('red')
pu()
goto(-300,-200)
pd()
fillcolor('red')
begin_fill()
for i in range(0,2):
fd(600)
lt(90)
fd(400)
lt(90)
end_fill()
#绘制大五角星
pu()
pencolor('yellow')
goto(-260,120)
pd()
fillcolor('yellow')
begin_fill()
for i in range(0,5):
fd(120)
rt(144)
end_fill()
#绘制四个小五角星
list1 = [(-100,160),(-60,120),(-60,60),(-100,20)]#四个五角星的中心坐标
list2 = [31.98,8.13,-15.59,-38.66]#相对角度0的后退1.111需要左转的角度
for j in range(0,4):
seth(0)#这是龟头角度为0
pu()
goto(list1[j])#定位到五角星中心
lt(list2[j])#旋转角度,以背向指向大五角星的角尖
bk(1.111)#从五角星中心到指向大五角星的角尖(龟倒着爬)
lt(18)#五角星的半角角度
pd()
fillcolor('yellow')
begin_fill()
for i in range(0, 5):
fd(40)
rt(144)
end_fill()
pu()#抬起龟头
ht()#隐藏龟头
done()#保持

效果图:

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本文为[osc_p5er4r6g]所创,转载请带上原文链接,感谢
https://my.oschina.net/u/4297414/blog/4715719

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