```Quick solution. Draws filled circles, corrected for non-square pixels. Can take non-integer x,y and radius.

Here http://pastie.org/214895
or below (not sure how long pastie keeps the content)

Cheers,
Dave

#http://pastie.org/214895
#
# Ruby Quiz 166 Circles
# David Phillips
#
# sample output
#
#  0000000000000--|||||||||||||||++++++      !!!!!!!!!!!!!!!!!!!!!!!!!
#  00000000000-----|||||||||||||++++++++   !!!!!!!!!!!!!!!!!!!!!!!
#  0000000000------|||||||||||||+++++++++ \      !!!!!!!!!!!!!!!!!!!!!!!
#  000000000--------|||||||||||++++++\\\\\\\\\\\\\!!!!!!!!!!!!!!!!!!!!!!!
#  000000000----------|||||||++++++\\\\\\\\\\\\\\\\\!!!!!!!!!!!!!!!!!!!!
#  00000000-------------------++++\\\\\\\\\\\\\\\\\\\!!!!!!!!!!!!!!!!!
#  000000000-----------------++++\\\\\\\\\\\\\\\\\\\\\!!!!!!!!!!!!!!!
#     000000-----------------+++\\\\\\\\\\\\\\\\\\\\\\\  !!!!!!!!!
#         0 -----------------+++\\\\\\\\\\\\\\\\\\\\\\\===== !
#             -------------    \\\\\\\\\\\\\\\\\\\\\\\\\=======
#           XXXX---------       \\\\\\\\\\\\\\\\\\\\\\\=========
#         XXXXXXXXXX-           \\\\\\\\\\\\\\\\\\\\\\\===========
#        XXXXXXXXXXXXX      ////\\\\\\\\\\\\\\\\\\\\\\\===========*
#  XXXXXXXXXXXXX   ////////\\\\\\\\\\\\\\\\\\\\\=============*
#       XXXXXXXXXXXXXXX //////////\\\\\\\\\\\\\\\\\\\==============**
#        XXXXXXXXXXXXX /////////////\\\\\\\\\\\\\\\=================*
#        XXXXXXXXXXXXX //////////////\\\\\\\\\\\\\=================**
#          XXXXXXXXX   /////////////////// \=======================***
#           XXXXXXX   ///////////////////// =======================**
#                      ///////////////////  *=====================***
#                      ///////////////////  ***=================*****
#                       /////////////////    ***===============*****
#    ///////////////      *****=========*******
#                         /////////////        ********=**********
#                               /                 *************
#    *

class Canvas
def initialize aspect_ratio=1.6
@rows= []
@y_multiplier= 1/aspect_ratio
yield self if block_given?
end

def set_pixel x, y, char
x, y = x.round, (@y_multiplier*y).round
(@rows[y]||=[])[x]=char unless (x<0 || y<0)
end

def to_s
@rows.map do |row|
row.nil? ? '' : row.map{|c|c||=' '}.join
end.join("\n")
end

# decided to try a method that doesn't require trig functions
def draw_circle x, y, r, fill_char='#'
(x-r).round.upto((x+r).round) do |col|
(y-r).round.upto(y+r) do |row|
if (col-x)**2+(row-y)**2 <= r**2
set_pixel col, row, fill_char
end
end # row
end # col
end # def
end

canvas= Canvas.new do |c|
%w[! . + * X 0 = / \\ - |].each do |char|
c.draw_circle rand(70), rand(30), 4+rand(10), char
end
end
puts canvas

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```