python實(shí)現(xiàn)櫻花
代碼如下:
from turtle import *
from random import *
from math import *
def tree(n, l):
pd () # 下筆
# 陰影效果
t = cos ( radians ( heading () + 45 ) ) / 8 + 0.25
pencolor ( t, t, t )
pensize ( n / 3 )
forward ( l ) # 畫樹枝
if n > 0:
b = random () * 15 + 10 # 右分支偏轉(zhuǎn)角度
c = random () * 15 + 10 # 左分支偏轉(zhuǎn)角度
d = l * (random () * 0.25 + 0.7) # 下一個(gè)分支的長(zhǎng)度
# 右轉(zhuǎn)一定角度,畫右分支
right ( b )
tree ( n - 1, d )
# 左轉(zhuǎn)一定角度,畫左分支
left ( b + c )
tree ( n - 1, d )
# 轉(zhuǎn)回來
right ( c )
else:
# 畫葉子
right ( 90 )
n = cos ( radians ( heading () - 45 ) ) / 4 + 0.5
ran = random ()
# 這里相比于原來隨機(jī)添加了填充的圓圈,讓櫻花葉子看起來更多一點(diǎn)
if (ran > 0.7):
begin_fill ()
circle ( 3 )
fillcolor ( 'pink' )
# 把原來隨機(jī)生成的葉子換成了統(tǒng)一的粉色
pencolor ( "pink" )
circle ( 3 )
if (ran > 0.7):
end_fill ()
left ( 90 )
# 添加0.3倍的飄落葉子
if (random () > 0.7):
pu ()
# 飄落
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 )
# 畫葉子
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 ) # 設(shè)置背景色(把灰色換成淡紫色)
ht () # 隱藏turtle
speed ( 0 ) # 速度 1-10漸進(jìn),0 最快
tracer ( 0, 0 )
pu () # 抬筆
backward ( 50 )
left ( 90 ) # 左轉(zhuǎn)90度
pu () # 抬筆
backward ( 300 ) # 后退300
tree ( 12, 100 ) # 遞歸7層
done ()