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@version
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@date 2020/02/08
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```
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-
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+
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+ #### 141 turtle绘制漫天雪花
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+
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+
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+ 导入模块
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+
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+ 导入 ` turtle ` 库和 python的 ` random `
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+
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+ ``` python
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+ import turtle as p
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+ import random
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+ ```
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+
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+ 绘制雪花
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+
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+ ``` python
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+ def snow (snow_count ):
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+ p.hideturtle()
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+ p.speed(500 )
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+ p.pensize(2 )
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+ for i in range (snow_count):
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+ r = random.random()
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+ g = random.random()
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+ b = random.random()
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+ p.pencolor(r, g, b)
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+ p.pu()
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+ p.goto(random.randint(- 350 , 350 ), random.randint(1 , 270 ))
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+ p.pd()
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+ dens = random.randint(8 , 12 )
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+ snowsize = random.randint(10 , 14 )
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+ for _ in range (dens):
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+ p.forward(snowsize) # 向当前画笔方向移动snowsize像素长度
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+ p.backward(snowsize) # 向当前画笔相反方向移动snowsize像素长度
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+ p.right(360 / dens) # 顺时针移动360 / dens度
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+
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+ ```
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+
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+ 绘制地面
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+
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+ ``` python
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+ def ground (ground_line_count ):
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+ p.hideturtle()
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+ p.speed(500 )
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+ for i in range (ground_line_count):
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+ p.pensize(random.randint(5 , 10 ))
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+ x = random.randint(- 400 , 350 )
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+ y = random.randint(- 280 , - 1 )
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+ r = - y / 280
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+ g = - y / 280
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+ b = - y / 280
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+ p.pencolor(r, g, b)
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+ p.penup() # 抬起画笔
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+ p.goto(x, y) # 让画笔移动到此位置
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+ p.pendown() # 放下画笔
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+ p.forward(random.randint(40 , 100 )) # 眼当前画笔方向向前移动40~100距离
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+ ```
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+
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+ 主函数
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+
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+ ``` python
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+ def main ():
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+ p.setup(800 , 600 , 0 , 0 )
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+ # p.tracer(False)
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+ p.bgcolor(" black" )
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+ snow(30 )
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+ ground(30 )
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+ # p.tracer(True)
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+ p.mainloop()
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+
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+ main()
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+ ```
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