auto save

1.py

+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
+        pencolor(n,n*0.8,n*0.8)
+        circle(3)
+        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(0.5,0.5,0.5)#背景色
+ht()#隐藏turtle
+speed(0)#速度 1-10渐进，0 最快
+tracer(0,0)
+pu()#抬笔
+backward(100)
+left(90)#左转90度
+pu()#抬笔
+backward(300)#后退300
+tree(12,100)#递归7层
+done()
+