save project

my_tree.py

@@ -5,18 +5,24 @@ pen.color('sienna')
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
-
+def tree(n,m,a):
+    if n>=50:
+        pen.pensize(n//10)
+        pen.forward(n)
+        pen.right(a)
+        tree(n-m,m,a)
+        pen.left(a*2)
+        tree(n-m,m,a)
+        pen.right(a)
+        pen.up()
+        pen.backward(n)
+        pen.down()
 # 移动到起点
 # 移动到起点
 pen.left(90)
 pen.left(90)
 pen.up()
 pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.backward(50)
-pen.left(60)
-pen.forward(50)
-pen.backward(50)
-pen.right(30)
+
+
+tree(100,10,30)
 turtle.done()
 turtle.done()