save project

my_tree.py

@@ -9,19 +9,25 @@ pen.down()      # wheat小麦
 pen.seth(90)
 pen.seth(90)
 # 移动到起点
 # 移动到起点
 def tree(n):
 def tree(n):
-    if n >= 50:
+    if n >= 0:
+        if n <=12:
+            color_list = ['snow','lightcoral']
+            color=random.choice(color_list)
+            pen.color(color)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
         pen.forward(n)
         pen.forward(n)
-        pen.right(30)
-        tree(n-10)
-        pen.left(60)
-        tree(n-10)
-        pen.right(30)
+        angle = random()
+        pen.right(30*angle)
+        length = 1.5*random.random()
+        tree(n-10*length)
+        pen.left(60*angle)
+        tree(n-10*length)
+        pen.right(30*angle)
         pen.up()
         pen.up()
         pen.backward(n)    # 后退
         pen.backward(n)    # 后退
         pen.down()
         pen.down()
-        if c==1:
-            pen.color("snow")
-        else:
-            pen.color("lightcoral")
-tree(100)        
+
+tree(60)        
 turtle.done()
 turtle.done()