python实现樱花

from turtle import *

from random import *

from math import *

def tree(n, l):

    pd ()  # 下笔

    # 阴影效果

    t = cos ( radians ( heading () + 45 ) ) / 8 + 0.25

    pencolor ( t, t, t )

    pensize ( n / 3 )

    forward ( l )  # 画树枝

    if n > 0:

        b = random () * 15 + 10  # 右分支偏转角度

        c = random () * 15 + 10  # 左分支偏转角度

        d = l * (random () * 0.25 + 0.7)  # 下一个分支的长度

        # 右转一定角度,画右分支

        right ( b )

        tree ( n - 1, d )

        # 左转一定角度，画左分支

        left ( b + c )

        tree ( n - 1, d )

        # 转回来

        right ( c )

    else:

        # 画叶子

        right ( 90 )

        n = cos ( radians ( heading () - 45 ) ) / 4 + 0.5

        ran = random ()

        # 这里相比于原来随机添加了填充的圆圈，让樱花叶子看起来更多一点

        if (ran > 0.7):

            begin_fill ()

            circle ( 3 )

            fillcolor ( 'pink' )

        # 把原来随机生成的叶子换成了统一的粉色

        pencolor ( "pink" )

        circle ( 3 )

        if (ran > 0.7):

            end_fill ()

        left ( 90 )

        # 添加0.3倍的飘落叶子

        if (random () > 0.7):

            pu ()

            # 飘落

            t = heading ()

            an = -40 + random () * 40

            setheading ( an )

            dis = int ( 800 * random () * 0.5 + 400 * random () * 0.3 + 200 * random () * 0.2 )

            forward ( dis )

            setheading ( t )

            # 画叶子

            pd ()

            right ( 90 )

            n = cos ( radians ( heading () - 45 ) ) / 4 + 0.5

            pencolor ( n * 0.5 + 0.5, 0.4 + n * 0.4, 0.4 + n * 0.4 )

            circle ( 2 )

            left ( 90 )

            pu ()

            # 返回

            t = heading ()

            setheading ( an )

            backward ( dis )

            setheading ( t )

    pu ()

    backward ( l )  # 退回

bgcolor ( 0.956, 0.9255, 0.9882 )  # 设置背景色（把灰色换成淡紫色）

ht ()  # 隐藏turtle

speed ( 0 )  # 速度 1-10渐进，0 最快

tracer ( 0, 0 )

pu ()  # 抬笔

backward ( 50 )

left ( 90 )  # 左转90度

pu ()  # 抬笔

backward ( 300 )  # 后退300

tree ( 12, 100 )  # 递归7层

done ()

效果如下：

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