Uitwerking: L-systemen
#! /usr/bin/env python
import turtle
import os
directory = './l_systemen'
posstack = list()
anglestack = list()
#angle = 85
#length = 40
#depth = 4
#rules = {'F' : 'F+F--F+F'}
# 85
# 40
# 4
# F:F+F--F+F
#for dirname, dirnames, filenames in os.walk('.'):
# print('filenames:',filenames)
def rules_from_file(fname):
rules = {}
with open(fname, 'r') as f:
angle = int(f.readline())
length = int(f.readline())
depth = int(f.readline())
axiom = f.readline()
for rule in f:
left = rule[0]
right = rule[2:]
rules[left] = right
return angle, length, depth, axiom, rules
def parameterised_replace(s, rules):
result = ''
for c in s:
if c in rules:
result += rules[c]
else:
result += c
return result
def draw(s, length, angle):
for c in s:
if c == 'F':
turtle.forward(length)
elif c == '-':
turtle.left(angle)
elif c == '+':
turtle.right(angle)
elif c == '[':
posstack.append(turtle.position())
anglestack.append(turtle.heading())
elif c == ']':
turtle.penup()
turtle.setposition(posstack.pop())
turtle.setheading(anglestack.pop())
turtle.pendown()
def readAndDraw(filename):
angle, length, depth, axiom, rules = rules_from_file(filename)
s = axiom
for i in range(depth):
s = parameterised_replace(s, rules)
turtle.speed(0)
turtle.penup()
turtle.setposition(-100, -200)
turtle.left(90)
turtle.pendown()
turtle.color('black', 'red')
#turtle.begin_fill()
turtle.delay(0)
draw(s, length, angle)
print('done')
#turtle.end_fill()
turtle.done()
for dirname, dirnames, filenames in os.walk(directory):
print (filenames)
for filename in filenames:
if len(filename) > 3 and filename[len(filename)-4:] == '.lst':
print('drawing ' + filename)
readAndDraw(directory + '/' + filename)
else:
print('skipping ' + filename)
print('finished!')
