def run(self, turtle: Turtle, depth: int, step: float, angle: float = 90, thickness='constant'):
s = self.generate_string(depth)
stack = []
for i in s:
if i == '[':
stack.append((turtle.position, turtle.angle))
elif i == ']':
turtle.position, turtle.angle = stack.pop()
elif i == '+':
turtle.right(angle)
elif i == '-':
turtle.left(angle)
elif i == '|':
turtle.left(180)
elif i.islower():
turtle.forward(step, usepen=False)
elif i.isupper():
if thickness == 'constant':
thicknessVal = 1
elif thickness == 'sq':
thicknessVal = 1.5 / (len(stack) + 1) ** 0.5
else:
raise ValueError()
turtle.forward(step, usepen=True, thickness=thicknessVal)
else:
raise ValueError("Incorrect action")
def sierpinsky(fn, angle=60, step=6):
turtle = Turtle(fn, (50, 50))
turtle.left(90)
lsystem = LSystem('A', {'A': 'B-A-B', 'B': 'A+B+A'})
turtle.resetpos((400, 400), 180)
lsystem.run(turtle, depth=6, step=step, angle=angle)
turtle.save(fn, frame=(500, 550))
def koch(fn):
turtle = Turtle(fn, (50, 50))
turtle.left(90)
lsystem = LSystem('F--F--F', {'F': 'F+F--F+F'})
turtle.resetpos((100, 150), -90)
lsystem.run(turtle, depth=3, step=6, angle=60)
turtle.save(fn, frame=(200, 200))
def pentaplexity(fn):
"""By: Paul Bourke"""
turtle = Turtle(fn, (50, 50))
turtle.left(90)
lsystem = LSystem('F++F++F++F++F', {'F': 'F++F++F|F-F++F'})
turtle.resetpos((80, 0), 0)
lsystem.run(turtle, depth=4, step=8, angle=36)
turtle.save(fn, frame=(600, 600))
pass
def kochline(self, turtle: Turtle, depth, size):
if depth == 1:
turtle.forward(size * 3**depth)
return
self.kochline(turtle, depth - 1, size)
turtle.left(60)
self.kochline(turtle, depth - 1, size)
turtle.right(120)
self.kochline(turtle, depth - 1, size)
turtle.left(60)
self.kochline(turtle, depth - 1, size)
def hilbert(self, turtle: Turtle, depth, size):
turtle.right(90)
if depth == 0:
turtle.forward(size * 3)
turtle.left(90)
turtle.forward(size * 3)
turtle.left(90)
turtle.forward(size * 3)
turtle.right(90)
else:
innersize = self.hs(depth - 1) * size * 3
turtle.forward(innersize, usepen=False)
turtle.right(180)
self.hilbert(turtle, depth - 1, size)
turtle.right(180)
turtle.forward(innersize, usepen=False)
turtle.forward(size * 3)
turtle.left(90)
self.hilbert(turtle, depth - 1, size)
turtle.forward(size * 3)
self.hilbert(turtle, depth - 1, size)
turtle.left(90)
turtle.forward(size * 3)
turtle.forward(innersize, usepen=False)
turtle.right(180)
self.hilbert(turtle, depth - 1, size)
turtle.right(180)
turtle.forward(innersize, usepen=False)
turtle.right(90)
def weed(fn):
turtle = Turtle(fn, (10, 500))
turtle.left(90)
lsystem = LSystem('X', {'X': 'F+[[X]-X]-F[-FX]+X', 'F': 'FF'})
turtle.resetpos((50, 0), -90)
lsystem.run(turtle, 1, 6, 25, thickness='sq')
turtle.resetpos((100, 0), -90)
lsystem.run(turtle, 2, 6, 25, thickness='sq')
turtle.resetpos((150, 0), -90)
lsystem.run(turtle, 3, 6, 25, thickness='sq')
turtle.resetpos((200, 0), -90)
lsystem.run(turtle, 4, 6, 25, thickness='sq')
turtle.resetpos((300, 0), -90)
lsystem.run(turtle, 5, 6, 25, thickness='sq')
turtle.save(fn, frame=(480, 20))
def paprad(fn):
"""Attributed to Saupe"""
turtle = Turtle(fn, (50, 50))
turtle.left(90)
lsystem = LSystem(
'VZFFF', {
'V': '[+++W][---W]YV',
'W': '+X[-W]Z',
'X': '-W[+X]Z',
'Y': 'YZ',
'Z': '[-FFF][+FFF]F'
})
turtle.resetpos((200, 400), -90)
lsystem.run(turtle, depth=8, step=8, angle=20, thickness='sq')
turtle.save(fn, frame=(500, 550))
def square_sierpinsky(fn):
angle = 90
length = 3
turtle = Turtle(fn, (10, 100))
turtle.left(90)
lsystem = LSystem(
{
'F': lambda: turtle.forward(length),
'X': lambda: None,
'+': lambda: turtle.right(angle),
'-': lambda: turtle.left(angle)
}, {
'F': 'F',
'X': 'XF-F+F-XF+F+XF-F+F-X'
}, 'F+XF+F+XF')
lsystem.run(4)
turtle.save(fn, (200, 100))
def run(self, fnprovider: AbstractFilenameProvider):
fn = fnprovider.get_filename(".svg", "fractals")
turtle = Turtle(fn, (50, 250))
turtle.left(90)
self.ker(turtle, 9, size=0.2)
turtle.resetpos(position=(200, -150))
turtle.right(60)
self.sierpinsky(turtle, 5, 9)
turtle.resetpos(position=(350, -120))
self.koch(turtle, 5, 0.8)
turtle.resetpos(position=(600, -150))
self.hilbert(turtle, 4, 2)
turtle.resetpos(position=(900, -200))
self.pentagon(turtle, 3, 10)
turtle.resetpos(position=(1200, -200))
self.square_sierpinsky(turtle, 4, 3)
turtle.save(frame=(1500, 500))
return fn
def pentagon(self, turtle: Turtle, depth, size):
outerangle = 360 / 5
innerangle = 180 - outerangle
if depth == 0:
for _ in range(5):
turtle.forward(size)
turtle.right(outerangle)
return
for _ in range(5):
self.pentagon(turtle, depth - 1, size)
turtle.forward(self.pentsize(depth) * size, usepen=False)
turtle.right(outerangle)
prevsize = self.pentsize(depth - 1) * size
turtle.forward(prevsize, usepen=False)
turtle.right(outerangle)
turtle.forward(prevsize, usepen=False)
turtle.right(outerangle - innerangle)
self.pentagon(turtle, depth - 1, size)
turtle.left(outerangle - innerangle)
turtle.back(prevsize, usepen=False)
turtle.left(outerangle)
turtle.back(prevsize, usepen=False)
def triangle(fn):
angle = 120
length = 10
turtle = Turtle(fn, (80, 250))
lsystem = LSystem(
{
'F': lambda: turtle.forward(length),
'f': lambda: turtle.forward(length, usepen=False),
'+': lambda: turtle.right(angle),
'-': lambda: turtle.left(angle)
}, {'F': 'F-F+F'}, 'F+F+F')
lsystem.run(0)
turtle.resetpos((50, 0))
lsystem.run(1)
turtle.resetpos((100, 0))
lsystem.run(2)
turtle.resetpos((160, 0))
lsystem.run(3)
turtle.resetpos((280, 0))
lsystem.run(4)
turtle.resetpos((400, 0))
lsystem.run(5)
turtle.save(frame=(500, 150))