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Sep 28th, 2009
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[Help] Koch snowflake from Python 2.5 [Turtle]

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Hey I'm very new to the programming world, and what i am trying to do is produce a Koch Snowflake via turtle from python2.5.
this is what I have so far...
Python Syntax (Toggle Plain Text)
  1. from turtle import *
  2.  
  3. def snowflake(lengthSide, levels):
  4.     if levels == 0:
  5.         return forward(lengthSide), right(120), forward(lengthSide), right(120), forward(lengthSide)
  6.  
  7.     forward(lengthSide)
  8.     left(60)
  9.     forward(lengthSide)
  10.     right(60)
  11.     right(60)
  12.     forward(lengthSide)
  13.     left(60)
  14.     forward(lengthSide)
  15.     right(120)
  16.     snowflake(lengthSide, levels)
as you can see i've only solved for levels 0 and 1... the problem is i dont understand how to recursively redraw it from a certain location. If anyone has any ideas or tip, it would be helpful.
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Re: [Help] Koch snowflake from Python 2.5 [Turtle]

I suggest this
python Syntax (Toggle Plain Text)
  1. from turtle import *
  2.  
  3. def snowflake(lengthSide, levels):
  4.     if levels == 0:
  5.         forward(lengthSide)
  6.         return
  7.     lengthSide /= 3.0
  8.     snowflake(lengthSide, levels-1)
  9.     left(60)
  10.     snowflake(lengthSide, levels-1)
  11.     right(120)
  12.     snowflake(lengthSide, levels-1)
  13.     left(60)
  14.     snowflake(lengthSide, levels-1)
  15.  
  16.  
  17. if __name__ == "__main__":
  18.     speed(0)
  19.     length = 300.0
  20.     penup()
  21.     backward(length/2.0)
  22.     pendown()
  23.     snowflake(length, 4)
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Re: [Help] Koch snowflake from Python 2.5 [Turtle]

Thank you very much, this helped alot!
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Dec 1st, 2010
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snowflake program

how do you modify the code so that it can make a full snowflake?
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Re: [Help] Koch snowflake from Python 2.5 [Turtle]
Click to Expand / Collapse  Quote originally posted by ohernandezmit ...
how do you modify the code so that it can make a full snowflake?
Simply define
python Syntax (Toggle Plain Text)
  1. def full_snowflake(lengthside, levels):
  2.     for i in range(3):
  3.         snowflake(lengthside, levels)
  4.         right(120)
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Dec 3rd, 2010
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Re: [Help] Koch snowflake from Python 2.5 [Turtle]
And put at the end of program:
Python Syntax (Toggle Plain Text)
  1.     mainloop()
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Re: [Help] Koch snowflake from Python 2.5 [Turtle]
where do you put the code in the program? I've tried to put it at the end but it doesn't work.
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Re: [Help] Koch snowflake from Python 2.5 [Turtle]
Python Syntax (Toggle Plain Text)
  1. from turtle import *
  2.  
  3. def snowflake(lengthSide, levels):
  4.     if levels == 0:
  5.         forward(lengthSide)
  6.         return
  7.     lengthSide /= 3.0
  8.     snowflake(lengthSide, levels-1)
  9.     left(60)
  10.     snowflake(lengthSide, levels-1)
  11.     right(120)
  12.     snowflake(lengthSide, levels-1)
  13.     left(60)
  14.     snowflake(lengthSide, levels-1)
  15.  
  16. def full_snowflake(lengthside, levels):
  17.     for i in range(3):
  18.         snowflake(lengthside, levels)
  19.         right(120)
  20.  
  21. if __name__ == "__main__":
  22.     speed(0)
  23.     length = 300.0
  24.     penup()
  25.     backward(length/2.0)
  26.     pendown()
  27.     full_snowflake(length, 4)
  28.     mainloop()
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Dec 4th, 2010
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A writer's snowflake.

Here is a snowflakes containing printable characters
python Syntax (Toggle Plain Text)
  1. from turtle import *
  2. import random, string
  3.  
  4. fact = (2.0/(3.0*sqrt(3.0)), sqrt(3.0)/2.0, 0.5)
  5.  
  6. def writers(cx, cy, lengthside, levels):
  7.     if levels == 0:
  8.         penup()
  9.         goto(cx, cy)
  10.         pendown()
  11.         write(random.choice(string.printable))
  12.         return
  13.     r = lengthside * fact[0]
  14.     a = r * fact[1]
  15.     b = r * fact[2]
  16.     centers = [(cx, cy), (cx, cy+r), (cx, cy-r), (cx+a, cy+b), (cx+a, cy-b), (cx-a, cy+b), (cx-a, cy-b)]
  17.     for ux, uy in centers:
  18.         writers(ux, uy, lengthside/3.0, levels-1)
  19.  
  20. if __name__ == "__main__":
  21.     speed(0)
  22.     length = 500.0
  23.     writers(0.0, 0.0, length, 4)
  24.     mainloop()
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Re: [Help] Koch snowflake from Python 2.5 [Turtle]
Thank you. That really helped!!
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