Creating sort visualiser in Ruby - ruby

Question

I'm trying to make a sort visualiser using Ruby and Gosu. When the user left clicks it will sort the numbers out using a insertion sort. When the user right clicks it will sort the numbers out using a bubble sort. So far the only the insertion sort works but the bubble sort crashes after sorting out the first number. Does anyone know why? Thanks.
require 'gosu'
module ZOrder
BACKGROUND, MIDDLE, TOP = *0..2
end
SCREEN_WIDTH = 600 # needs to be COUNT * COLUMN_WIDTH
SCREEN_HEIGHT = 200 # Should be multiple of 100
MAX_VALUE = 100 # the range of the data 1 to 100
COUNT = 30 # Number of items
COL_WIDTH = 20 # suggested at least 10
class Column
# have a pointer to the neighbouring cells
attr_accessor :height, :value
def initialize(value)
#value = value
#height = (SCREEN_HEIGHT/MAX_VALUE) * value
end
end
class GameWindow < Gosu::Window
def initialize
super SCREEN_WIDTH, SCREEN_HEIGHT, false
self.caption = "Sort Visualiser"
#path = nil
#do_insert = false
#do_bubble = false
#columns = Array.new(COUNT)
column_index = 0
while (column_index < COUNT)
col = Column.new(rand(MAX_VALUE + 1))
#columns[column_index] = col
column_index += 1
end
#text_font = Gosu::Font.new(10)
end
def needs_cursor?
true
end
def insertion_sort(loop)
j = loop
done = false
while ((j > 0) and (!done))
if (#columns[j].value < #columns[j - 1].value)
temp = #columns[j - 1]
#columns[j - 1] = #columns[j]
#columns[j] = temp
else
done = true
end
j = j - 1
end
end
def bubble_sort(loop2)
j = loop2
i = loop2 + 1
done = false
while ((j > 0) and (!done))
if (#columns[j].value > #columns[i].value)
temp = #columns[j]
#columns[j] = #columns[i]
#columns[i] = temp
else
done = true
end
j = j - 1
end
end
def button_down(id)
case id
when Gosu::MsLeft
#do_insert = true
#loop = 0
#do_bubble = false
when Gosu::MsRight
#do_bubble = true
#loop2 = 0
#do_insert = false
end
end
def update
if (#do_insert)
puts "Doing insert #{#loop}"
if #loop < (COUNT)
insertion_sort(#loop)
#loop += 1
sleep(0.5)
else
#do_insert = false
end
end
if (#do_bubble)
puts "Doing bubble #{#loop2}"
if #loop2 < (COUNT)
bubble_sort(#loop2)
#loop2 += 1
sleep(0.5)
else
#do_bubble = false
end
end
end
def draw
column_index = 0
while (column_index < #columns.length)
color = Gosu::Color::GREEN
Gosu.draw_rect((column_index * COL_WIDTH), SCREEN_HEIGHT - #columns[column_index].height, COL_WIDTH, #columns[column_index].height, color, ZOrder::MIDDLE, mode=:default)
#text_font.draw("#{#columns[column_index].value}", (column_index * COL_WIDTH) + 5, SCREEN_HEIGHT - 10, ZOrder::TOP, 1.0, 1.0, Gosu::Color::RED)
column_index += 1
end
end
end
window = GameWindow.new
window.show
EDIT: Added in the rest of the code and removed some tags