From: Albert Ng <twinwing@...>
Date: 2007-03-11T22:09:11+09:00
Subject: Re: [QUIZ] SimFrost (#117)

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Greetings and Salutations to each and all!

This is my first time submitting to the QUIZ.  Please critique, I'm still
learning Ruby, and TASM at school is messing with my brain (can't think
rubyly).

Here's the code:

class Snowflake
  attr_reader :grid, :vapor
  def initialize (y_size=24, x_size=30, vapor_percent=30)
    @y_size=y_size/2*2    #this should take care of those odd numbers
    @x_size=x_size/2*2
    @vapor_percent=vapor_percent
    @vacuum=" "
    @vapor="+"
    @ice="*"
    @offset=1
    create_grid
  end

  def create_grid
    @grid=Array.new(@y_size){Array.new(@x_size)}
    @grid.collect! do |row|
      row.collect! do |square|
        rand(100) < @vapor_percent ? @vapor : @vacuum
      end
    end
    @grid[@y_size/2][@x_size/2]=@ice
  end

  def check_neighborhoods
    @offset = (@offset +1)%2
    @grid.collect!{|row| row.push(row.slice!(0))}.push(@grid.slice!(0)) if
@offset == 1  #torus me!
    (0...@y_size).step(2) do |i|
      (0...@x_size).step(2) do |j|
        neighborhood=[@grid[i][j], @grid[i][j+1], @grid[i+1][j],
@grid[i+1][j+1]]
        if !neighborhood.include?(@vapor)
        elsif neighborhood.include?(@ice)
#there's got to be a rubyer way of doing this...
          @grid[i][j]         =@ice if  @grid[i][j]           == @vapor
#top left corner
          @grid[i][j+1]     =@ice if  @grid[i][j+1]       == @vapor     #one
right
          @grid[i+1][j]     =@ice if  @grid[i+1][j]       == @vapor     #one
down
          @grid[i+1][j+1] =@ice if  @grid[i+1][j+1]   == @vapor     #right
and down
        elsif rand(2)==1
          @grid[i][j], @grid[i][j+1], @grid[i+1][j], @grid[i+1][j+1] =
@grid[i+1][j], @grid[i][j], @grid[i+1][j+1], @grid[i][j+1]
        else        #It's the correct sequence, maybe...  I think...
          @grid[i][j], @grid[i][j+1], @grid[i+1][j], @grid[i+1][j+1] =
@grid[i][j+1], @grid[i+1][j+1], @grid[i][j], @grid[i+1][j]
        end
      end
    end   #pop is to push, as slice!(0) is to ???.  Many thanks to James
Edward Gray: flip the data!
    @grid.reverse!.collect!{|row| row.reverse!.push(row.slice!
(0)).reverse!}.push(@grid.slice!(0)).reverse! if @offset ==1
  end

  def to_s
    @grid.collect{|row| row.join}.join("\n")
  end
end

s=Snowflake.new(18,18,10)
while s.grid.collect{|row| true if row.include?(s.vapor)}.include?(true)
  puts s
  5.times do puts end
  sleep(0.1)
  s.check_neighborhoods
end
  puts s

=begin Running through the finish line

               **
       *       *
       *   *  *
        *   **
         ** **
          **
        *** *
          ***
           * *
            * *
             *
             *
=end

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