tempo.rb in music-transcription-0.19.0

- old
+ new

@@ -1,37 +1,27 @@
 module Music
 module Transcription
 
-# Represent the musical tempo, with beats ber minute and beat duration.
 class Tempo
-  include Comparable
-  attr_reader :beats_per_minute, :beat_duration
-  
-  def initialize beats_per_minute, beat_duration = Rational(1,4)
-    @beats_per_minute = beats_per_minute
-    @beat_duration = beat_duration
+  attr_reader :value
+  def initialize value
+    raise NonPositiveError, "Given tempo value #{value} is not positive" if value <= 0
+    @value = value
   end
   
   def ==(other)
-    (other.beats_per_minute == @beats_per_minute) &&
-    (other.beat_duration == @beat_duration)
+    self.class == other.class && self.value == other.value
   end
   
-  def notes_per_second
-    (@beats_per_minute * @beat_duration) / 60.0
-  end
-  
-  def between? a, b
-    notes_per_second.between? a, b
-  end
-  
-  def <=>(other)
-    if other.is_a? Tempo
-      notes_per_second <=> other.notes_per_second
-    else
-      notes_per_second <=> other
+  [ :qnpm, :bpm, :npm, :nps ].each do |sym|
+    klass = Class.new(Tempo) do
+      def to_s
+        "#{@value}#{self.class::PRINT_SYM}"
+      end
     end
+    klass.const_set(:PRINT_SYM,sym)
+    Tempo.const_set(sym.upcase,klass)
   end
 end
 
 end
-end
+end
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