使用分形、类和Spumgy的TurtleWorld-Python-调试制作二叉树
我有一段代码,它读取并解释一个分形描述语言文件,然后使用FractalWorld,这是TurtleWorld的一个特殊版本,它只移除海龟,没有延迟使用分形、类和Spumgy的TurtleWorld-Python-调试制作二叉树,python,tree,fractals,Python,Tree,Fractals,我有一段代码,它读取并解释一个分形描述语言文件,然后使用FractalWorld,这是TurtleWorld的一个特殊版本,它只移除海龟,没有延迟 import math, random, sys from FractalWorld import * world = FractalWorld(width=1000,height=1000,delay=0) Rasmus = Fractal(draw=False) class command(object): def __init__(
import math, random, sys
from FractalWorld import *
world = FractalWorld(width=1000,height=1000,delay=0)
Rasmus = Fractal(draw=False)
class command(object):
def __init__(self, cmd, l):
self.cmd = cmd
self.l = l
def execute(self, turtle, length):
if self.cmd=='lt':
lt(turtle, int(self.l[0]))
if self.cmd=='rt':
rt(turtle, int(self.l[0]))
if self.cmd=='fd':
fd(turtle, length)
if self.cmd=='bk':
bk(turtle, length)
if self.cmd=='scale':
lenght = length*float(self.l[0])
class rule(object):
def __init__(self):
self.rule={} #we make an empty dictionary
def newrule(self,leftside,rightside):
self.rule[leftside]=rightside #we fill the dictionary
def expand (self,oldlist,depth):
if depth <= 0:
return oldlist
newlist=[] # we make an empty new list
for i in oldlist:
if i not in self.rule:
newlist.append(i)
else:
newlist.append(self.expand(self.rule[i],depth-1))
return newlist
class Fractal(object):
def __init__(self, start, rules, commands, length, depth):
self.start = start
self.rules = rules
self.commands = commands
self.length = length
self.depth = depth
def draw(self, oldlist):
for i in oldlist:
if type(i) == list:
self.draw(i)
else:
cmd = self.commands[i]
cmd.execute(Rasmus, self.length)
def read():
files = open('tree.fdl')
commands = {}
r = rule()
for line in files:
line = line.strip()
oldlist = line.split(' ')
if oldlist[0] == 'start':
start = oldlist[1:]
elif oldlist[0] == 'rule':
r.newrule(oldlist[1], oldlist[3:])
elif oldlist[0] == 'cmd':
cmd = command(oldlist[2], oldlist[3:])
commands[oldlist[1]] = cmd
elif oldlist[0] == 'length':
length = int(oldlist[1])
elif oldlist[0] == 'depth':
depth = int(oldlist[1])
return Fractal(start, r, commands, length, depth)
re = read()
print re.commands.keys()
l = re.rules.expand(re.start , re.depth)
re.draw(l)
wait_for_user()
我的问题是我的解释器有一个bug。似乎解释器没有读取正确的比例,并向下缩放我的线条,以获得下一个深度的树枝。我试过调试它,但没能做到
lenght = length*float(self.l[0])
这条线有两个错误。首先是打字错误。但是,即使名称是正确的,您也会像在函数中做的最后一件事一样为局部变量赋值,这是毫无意义的。您可能应该将其替换为xxx.length,以便调用该函数可以更改其值。我写为xxx的对象可能是调用方可用的分形实例;然后将其作为参数传递,而不是长度。在哪里可以找到分形世界?
lenght = length*float(self.l[0])