python海龟绘图实例教程
本文以实例形式介绍了python turtle模块即海龟绘图的使用方法，对于需要进行图形编程的朋友相信会有一定的借鉴价值。
python turtle模块简介：
python2.6版本中引入的一个简单的绘图工具，叫做海龟绘图(Turtle Graphics)
1.使用海龟绘图首先我们需要导入turtle，如下所示：
from turtle import * #将turtle中的所有方法导入
2.海龟绘图属性：
(1)位置
(2)方向
(3)画笔(画笔的属性，颜色、画线的宽度)
3.操纵海龟绘图有着许多的命令,这些命令可以划分为两种:一种为运动命令，一种为画笔控制命令
(1)运动命令:
forward(degree) #向前移动距离degree代表距离 backward(degree) #向后移动距离degree代表距离 right(degree) #向右移动多少度 left(degree) #向左移动多少度 goto(x,y) #将画笔移动到坐标为x,y的位置 stamp() #复制当前图形 speed(speed) #画笔绘制的速度范围[0,10]整数
(2)画笔控制命令:
down() #移动时绘制图形,缺省时也为绘制 up() #移动时不绘制图形 pensize(width) #绘制图形时的宽度 color(colorstring) #绘制图形时的颜色 fillcolor(colorstring) #绘制图形的填充颜色 fill(Ture) fill(false)
4.关于turtle简介许多下面我们看个实例：
(一)绘制正方形：
import turtle
import time
#定义绘制时画笔的颜色
turtle.color("purple")
#定义绘制时画笔的线条的宽度
turtle.size(5)
#定义绘图的速度
turtle.speed(10)
#以0,0为起点进行绘制
turtle.goto(0,0)
#绘出正方形的四条边
for i in range(4):
turtle.forward(100)
turtle.right(90)
#画笔移动到点(-150,-120)时不绘图
turtle.up()
turtle.goto(-150,-120)
#再次定义画笔颜色
turtle.color("red")
#在(-150,-120)点上打印"Done"
turtle.write("Done")
time.sleep(3)
(二)绘制五角星：
import turtle
import time
turtle.color("purple")
turtle.pensize(5)
turtle.goto(0,0)
turtle.speed(10)
for i in range(6):
turtle.forward(100)
turtle.right(144)
turtle.up()
turtle.forward(100)
turtle.goto(-150,-120)
turtle.color("red")
turtle.write("Done")
time.sleep(3)
这里给出了两个简单的实例，大家可以根据上面的思路与方法进一步拓展，绘制出一些更复杂的图形。
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