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小学生Python进阶:turtle第6课·画圆与弧线

  • 2026-06-21 22:41:04
小学生Python进阶:turtle第6课·画圆与弧线

上节课我们学会了用坐标精准定位。这节课来学 turtle 里最好玩的命令之一——画圆和弧线!只需一行代码,就能画出圆形、半圆、彩虹、螺旋线……

一、画圆:circle()

circle(r) 让海龟画一个半径为 r 的圆:

import turtle

t = turtle.Turtle()
t.pensize(3)
t.pencolor("royalblue")

t.circle(80)    # 画一个半径80的圆

turtle.done()

注意:海龟从当前位置出发,逆时针画圆,圆心在海龟左侧。

二、画弧线:circle(r, 角度)

加上第二个参数,可以只画一部分圆弧:

命令效果
t.circle(80)完整的圆(360°)
t.circle(80, 180)半圆(180°)
t.circle(80, 90)四分之一圆弧(90°)
t.circle(80, 270)四分之三圆弧(270°)
import turtle

t = turtle.Turtle()
t.pensize(3)
t.speed(3)

t.pencolor("red")
t.circle(60, 180)    # 红色半圆

t.penup()
t.goto(0, -80)
t.pendown()

t.pencolor("blue")
t.circle(60, 90)     # 蓝色四分之一弧

turtle.done()

三、实战:画彩色同心圆 🎯

import turtle

t = turtle.Turtle()
t.speed(0)
t.pensize(3)

colors = ["red", "orange", "gold", "green", "royalblue", "purple"]

for i in range(len(colors)):
    r = 30 + i * 25          # 半径逐渐增大
    t.penup()
    t.goto(0, -r)            # 每次从圆的最低点出发
    t.pendown()
    t.pencolor(colors[i])
    t.circle(r)              # 画完整的圆

turtle.done()

关键技巧:每次把海龟移到 (0, -r),这样所有圆都以原点为圆心!🎯

四、实战:画彩虹 🌈

import turtle

t = turtle.Turtle()
t.speed(0)
t.pensize(6)

colors = ["red", "orange", "gold", "green", "royalblue", "blue", "purple"]

for i in range(len(colors)):
    r = 50 + i * 20          # 半径从50开始,每次加20
    t.penup()
    t.goto(-r, 0)            # 从圆的最左边出发
    t.setheading(0)          # 朝向右方
    t.pendown()
    t.pencolor(colors[i])
    t.circle(r, 180)         # 画半圆(彩虹弧)

turtle.done()

7种颜色,7个半圆,彩虹就出来了!🌈

五、实战:画螺旋线 🌀

import turtle

t = turtle.Turtle()
t.speed(0)
t.pensize(2)

colors = ["red", "orange", "gold", "green", "royalblue", "purple"]

for i in range(60):
    t.pencolor(colors[i % len(colors)])   # 循环使用颜色
    t.circle(5 + i * 3, 60)              # 半径逐渐增大,每次画60°弧

turtle.done()

每次画一小段弧,半径越来越大,就形成了螺旋!🌀

六、circle() 参数总结

参数说明示例
r(必填)圆的半径,越大圆越大circle(50)
extent(可选)画多少度,默认360(完整圆)circle(50, 180)
r 为负数顺时针画圆(默认逆时针)circle(-50)

七、小挑战

  • 🟢 简单:画3个不同大小的圆,颜色各不同
  • 🟡 中等:画一个太阳——中间实心圆 + 周围8条射线
  • 🔴 困难:画一朵花——6片花瓣(每片是一个圆),花心是实心圆

八、下期预告

学会画圆之后,下节课我们来学颜色填充进阶——渐变色、多色填充,让图案更漂亮!

下期:《turtle第7课:颜色填充进阶》

有问题欢迎留言!

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  1. CONNECT:[ UseTime:0.001223s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001626s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000773s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000648s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001227s ]
  6. SELECT * FROM `set` [ RunTime:0.003293s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001482s ]
  8. SELECT * FROM `article` WHERE `id` = 489565 LIMIT 1 [ RunTime:0.011481s ]
  9. UPDATE `article` SET `lasttime` = 1783067840 WHERE `id` = 489565 [ RunTime:0.027701s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005024s ]
  11. SELECT * FROM `article` WHERE `id` < 489565 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003431s ]
  12. SELECT * FROM `article` WHERE `id` > 489565 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002512s ]
  13. SELECT * FROM `article` WHERE `id` < 489565 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.052220s ]
  14. SELECT * FROM `article` WHERE `id` < 489565 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006764s ]
  15. SELECT * FROM `article` WHERE `id` < 489565 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.040152s ]
0.354194s