turtle实例

1、彩虹

（1）

 from turtle import *

 def HSB2RGB(hues):
     hues = hues * 3.59 #100转成359范围
     rgb=[0.0,0.0,0.0]
     i = int(hues/60)%6
     f = hues/60 -i
     if i == 0:
         rgb[0] = 1; rgb[1] = f; rgb[2] = 0
     elif i == 1:
         rgb[0] = 1-f; rgb[1] = 1; rgb[2] = 0
     elif i == 2:
         rgb[0] = 0; rgb[1] = 1; rgb[2] = f
     elif i == 3:
         rgb[0] = 0; rgb[1] = 1-f; rgb[2] = 1
     elif i == 4:
         rgb[0] = f; rgb[1] = 0; rgb[2] = 1
     elif i == 5:
         rgb[0] = 1; rgb[1] = 0; rgb[2] = 1-f
     return rgb

 def rainbow():
     hues = 0.0
     color(1,0,0)
     #绘制彩虹
     hideturtle()
     speed(100)
     pensize(3)
     penup()
     goto(-400,-300)
     pendown()
     right(110)
     for i in range (100):
         circle(1000)#圆，彩虹
         right(0.13)
         hues = hues + 1
         rgb = HSB2RGB(hues)
         color(rgb[0],rgb[1],rgb[2])
     penup()

 def main():
     setup(800, 600,0,0)
     bgcolor((0.8, 0.8, 1.0))
     #tracer(False)
     rainbow()
     #输出文字
     tracer(False)
     goto(100,-100)
     pendown()
     color("red")
     write("Rainbow",align="center",
           font=("Script MT Bold", 80, "bold"))
     #tracer(True)

     mainloop()

 if __name__ == "__main__":
     main()

2、雪花

 from turtle import *
 from random import *   

 def ground():#画下面的土地
     hideturtle()  #隐藏乌龟
     speed(100)  #速度
     for i in range(400):
         pensize(randint(5,10))#画笔尺寸

         x = randint(-400,350)#位置
         y = randint(-280,-1)

         r = -y/280
         g = -y/280
         b = -y/280

         pencolor((r, g, b))#颜色暗色调, (1,1,1)白色;(0,0,0)黑色;(100)红色;(010)绿色;(001)蓝色
         penup()
         goto(x,y)#移动x轴
         pendown()

         forward(randint(40,100))

 def snow():
     hideturtle()
     pensize(2)
     speed(100)
     for i in range(100):
         r = random()
         g = random()
         b = random()
         pencolor(r, g, b)#随机生成

         penup()
         setx(randint(-350,350))
         sety(randint(1,270))
         pendown()

         dens = randint(8,12)#雪瓣
         snowsize = randint(10,14)
         for j in range(dens):
             forward(snowsize)
             backward(snowsize)
             right(360/dens)

 def main():
     setup(800, 600, 0, 0)
     tracer(False)
     bgcolor("black")
     snow()
     ground()
     tracer(True)
     mainloop()

 if __name__ == "__main__":
     main()