Python turtle模块绘制五星红旗实战解析

夏知夏

发布时间：2026-10-13| 3人浏览过

原创

本文介绍利用Python turtle模块绘制五星红旗的方法，重点解析draw_rectangle和draw_star两个核心函数的实现逻辑。文章详细讲解了矩形绘制、五角星定位及角度计算技巧，特别是利用turtle.towards()处理小星星朝向的问题，并附带完整代码与运行结果演示，帮助开发者掌握Python图形编程基础。

Python turtle绘制国旗核心函数解析

利用Python的turtle模块绘制国旗，核心依赖于两个自定义函数：draw_rectangle用于绘制矩形背景，draw_star用于绘制五角星。

函数的调用逻辑与C、C++等语言相似。实现国旗绘制前，需先明确国旗的几何画法，再通过代码还原。在实践过程中，主要难点在于对turtle.circle()函数的精确控制。该函数绘制圆弧时，海龟的朝向即为圆弧切线方向，而圆心位于海龟垂直方向的直线上，通过指定radius参数即可完成绘制。此外，需特别注意小五角星与大五角星的位置关系，程序中通过turtle.left(turtle.towards(center_x,center_y)-turtle.heading())来调整小星星的朝向。虽然部分实现使用了round()函数获取近似值，但默认精度已足够满足需求。以下是具体的代码实现及运行效果演示。

国旗绘制完整代码实现


import time
import turtle
import os
'''
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'''
def draw_rectangle(start_x,start_y,rec_x,rec_y):
 turtle.goto(start_x,start_y)
 turtle.color('red')
 turtle.fillcolor('red')
 turtle.begin_fill()
 for i in range(2):
  turtle.forward(rec_x)
  turtle.left(90)
  turtle.forward(rec_y)
  turtle.left(90)
 turtle.end_fill()
 
 
 
 
def draw_star(center_x,center_y,radius):
 turtle.setpos(center_x,center_y)
 #find the peak of the five-pointed star
 pt1=turtle.pos()
 turtle.circle(-radius,72)
 pt2=turtle.pos()
 turtle.circle(-radius,72)
 pt3=turtle.pos()
 turtle.circle(-radius,72)
 pt4=turtle.pos()
 turtle.circle(-radius,72)
 pt5=turtle.pos()
 #draw the five-pointed star
 turtle.color('yellow','yellow')
 turtle.fill(True)
 turtle.goto(pt3)
 turtle.goto(pt1)
 turtle.goto(pt4)
 turtle.goto(pt2)
 turtle.goto(pt5)
 turtle.fill(False)
 
 
#start the project
turtle.speed(5)
turtle.penup()
#draw the rectangle
star_x=-320
star_y=-260
len_x=660
len_y=440
draw_rectangle(star_x,star_y,len_x,len_y)
#draw the big star
pice=660/30
big_center_x=star_x+5*pice
big_center_y=star_y+len_y-pice*5
turtle.goto(big_center_x,big_center_y)
turtle.left(90)
turtle.forward(pice*3)
turtle.right(90)
draw_star(turtle.xcor(),turtle.ycor(),pice*3)
#draw the small star
turtle.goto(star_x+10*pice,star_y+len_y-pice*2)
turtle.left(turtle.towards(big_center_x,big_center_y)-turtle.heading())
turtle.forward(pice)
turtle.right(90)
draw_star(turtle.xcor(),turtle.ycor(),pice)
#draw the second star
turtle.goto(star_x+pice*12,star_y+len_y-pice*4)
turtle.left(turtle.towards(big_center_x,big_center_y)-turtle.heading())
turtle.forward(pice)
turtle.right(90)
draw_star(turtle.xcor(),turtle.ycor(),pice)
#draw the third
turtle.goto(star_x+pice*12,star_y+len_y-7*pice)
turtle.left(turtle.towards(big_center_x,big_center_y)-turtle.heading())
turtle.forward(pice)
turtle.right(90)
draw_star(turtle.xcor(),turtle.ycor(),pice)
#draw the final
turtle.goto(star_x+pice*10,star_y+len_y-9*pice)
turtle.left(turtle.towards(big_center_x,big_center_y)-turtle.heading())
turtle.forward(pice)
turtle.right(90)
draw_star(turtle.xcor(),turtle.ycor(),pice)
 
 
turtle.ht()
time.sleep(3)
os._exit(1)