#draw first circle
turtle.penup()
turtle.goto(0,-200)
turtle.pendown()
turtle.circle(200)
#draw second circle
turtle.penup()
turtle.goto(0,-150)
turtle.pendown()
turtle.circle(150)
#draw third circle
turtle.penup()
turtle.goto(0,-100)
turtle.pendown()
turtle.circle(100)
#draw fourth circle
turtle.penup()
turtle.goto(0,-50)
turtle.pendown()
turtle.circle(50)
因为turtle画圆的时候是从圆的底部开始画的,所以需要找到四个圆底部的坐标
比如:
第一个半径为200的圆,底部为(0,-200)
第二个半径为150的圆,底部为(0,-150)
第三个半径为100的圆,底部为(0,-100)
第四个半径为 50的圆,底部为(0, -50)
画的时候按下面的步骤:
抬起画笔:turtle.penup()
移动到相应坐标:turtle.goto(坐标)
放下画笔:turtle.pendown()
画圆:turtle.circle(半径)
效果如下图所示:
#################################### coding=utf-8
# !/usr/bin/env python
# __author__ = 'pipi'
# ctime 2014.10.11
# 绘制椭圆和圆形
###################################
from matplotlib.patches import Ellipse, Circle
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(111)
ell1 = Ellipse(xy = (0.0, 0.0), width = 4, height = 8, angle = 30.0, facecolor= 'yellow', alpha=0.3)
cir1 = Circle(xy = (0.0, 0.0), radius=2, alpha=0.5)
ax.add_patch(ell1)
ax.add_patch(cir1)
x, y = 0, 0
ax.plot(x, y, 'ro')
plt.axis('scaled')
# ax.set_xlim(-4, 4)
# ax.set_ylim(-4, 4)
plt.axis('equal') #changes limits of x or y axis so that equal increments of x and y have the same length
plt.show()
你可以试试,谢谢。