mode scale search in different keys

music_scale.rb

def showScale( key, mode)
	scale 	= ["C","#C/bD","D","#D/bE","E","F","#F/bG","G","#G/bA","A","#A/bB","B"]
	mode_hash = {
		# 1 means a semitone and 2 means two semitone
		"Ionian" 	=> [2,2,1,2,2,2,1],
		"Dorian"	=> [2,1,2,2,2,1,2],
		"Phrygian"	=> [1,2,2,2,1,2,2],
		"Lydian"	=> [2,2,2,1,2,2,1],
		"Mixolydian"=> [2,2,1,2,2,1,2],
		"Aeolian"	=> [2,1,2,2,1,2,2],
		"Locrian"	=> [1,2,2,1,2,2,2]
	}
	# ==============================
	pos = scale.index(key)
	for i in (0..6) 
		print scale[pos] + ' '
		pos += (mode_hash[mode]).at(i)
		pos %= 12
	end
	puts scale[pos]
	# ==============================
end

# Ionian scale in different keys
p "Ionian scale in different keys"
showScale("C","Ionian")
showScale("D","Ionian")
showScale("E","Ionian")
showScale("F","Ionian")
showScale("G","Ionian")
showScale("A","Ionian")
showScale("B","Ionian")

puts
puts

# Mixolydian scale in different keys
p "Mixolydian scale in different keys"
showScale("C","Mixolydian")
showScale("D","Mixolydian")
showScale("E","Mixolydian")
showScale("F","Mixolydian")
showScale("G","Mixolydian")
showScale("A","Mixolydian")
showScale("B","Mixolydian")

=begin
//output:
"Ionian scale in different keys"
C D E F G A B C
D E #F/bG G A B #C/bD D
E #F/bG #G/bA A B #C/bD #D/bE E
F G A #A/bB C D E F
G A B C D E #F/bG G
A B #C/bD D E #F/bG #G/bA A
B #C/bD #D/bE E #F/bG #G/bA #A/bB B


"Mixolydian scale in different keys"
C D E F G A #A/bB C
D E #F/bG G A B C D
E #F/bG #G/bA A B #C/bD D E
F G A #A/bB C D #D/bE F
G A B C D E F G
A B #C/bD D E #F/bG G A
B #C/bD #D/bE E #F/bG #G/bA A B

=end