From: Sandro Paganotti <sandro.paganotti@...>
Date: 2008-06-17T18:09:09+09:00
Subject: Re: [QUIZ] Circle Drawing (#166)

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Here's mine

# initial values
r = ARGV[0].to_i; k = 360.0/(Math::PI*2)

# if r < 1 write error and exit
puts "USAGE: circle.rb radius [with radius >= 1]"; exit if r < 1

# get some points and map them on a matrix
m = Array.new(r).collect{|e|Array.new(r).fill(" ")}
j = [0.0,90.0,*(1...p=((vr=(r-1))*2)).to_a.collect{|e|
    e*(90.0/p.to_f) }].each{|a|
    vl=[Math.sin(a/k),Math.cos(a/k)].collect{|c| (c*vr).round }
    m[vl[0]][vl[1]]="#" }
s = m.collect{|a| w=a.join(""); w.reverse+w }.join("\n")

# print the result
puts s.reverse+"\n"+s


On Mon, Jun 16, 2008 at 3:54 PM, Jon Garvin <jgarvin.lists@gmail.com> wrote:

> Here's mine before I delved into trying to add the aspect ratio feature.
>
>
> class Circle
>  def initialize(radius)
>   @radius = radius.to_i
>  end
>
>  def draw
>   (0..@radius*2).each do |x|
>     (0..@radius*2).each do |y|
>       print distance_from_center(x,y).round == @radius ? '#' : '.'
>     end
>     puts
>   end
>  end
>
>  def distance_from_center(x,y)
>   a = calc_side(x)
>   b = calc_side(y)
>   return Math.sqrt(a**2 + b**2)
>  end
>
>  def calc_side(z)
>   z < @radius ? (@radius - z) : (z - @radius)
>  end
> end
>
> Circle.new(ARGV.shift).draw
>
> --
>
> http://www.5valleys.com/
>
> http://www.workingwithrails.com/person/8078
>
>
>


-- 
Go outside! The graphics are amazing!

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