class Mystic::Interval

• Mystic::Interval
• Reference
• Object

Overview

Represents an interval

To create an Interval:

# Ascending Major 3rd
Interval.new("M3")

# Descending intervals have a negative value
# Descending Perfect 5th
Interval.new("P-5")

Available qualities are: M (major), m (minor), P (perfect), d (diminished), A (augmented). Going further is also possible, for example dd (doubly diminished) and AAA (triply augmented)

Defined in:

Constant Summary

BASE_SEMITONES = [0, 2, 3, 5, 7, 8, 10]

INTERVAL_COORDS = {"1": Coords.new(0, 0), "2": Coords.new(3, -5), "3": Coords.new(2, -3), "4": Coords.new(1, -1), "5": Coords.new(0, 1), "6": Coords.new(3, -4), "7": Coords.new(2, -2), "8": Coords.new(1, 0)}

QUALITY_SEMITONE_OFFSETS = {P: 0, m: 0, M: 1, A: 1, d: -1}

SHARP_COORDS = Coords.new(-4, 7)

Constructors

• .from_coords(coords : Coords) : Interval
• .new(s : String)

Instance Method Summary

• #+(other : self) : Interval
• #+(note : Note) : Note

  Adding intervals to notes is defined in the Note class

• #-(other : self) : Interval
• #<(other : self) : Bool
• #<=>(other : self) : Int32

  Note: this compares intervals as ordered on a staff rather than by pitch.

• #==(other : self) : Bool

  Returns true if this reference is the same as other.

• #>(other : self) : Bool
• #compound? : Bool

  Returns if compound (greater than an octave)

• #coords : Coords

  Returns Coords representation

• #direction : Int32

  Returns 1 if ascending and -1 if descending

• #invert : self

  Returns the inversion If compound, returns the inversion of the simple form

• #number : Int32

  Returns the (positive) number

• #octaves : Int32

  Returns number of octaves above the simple interval Note: an octave is considered a simple interval

• #quality : String
• #quality_offset : Int32

  Returns the accidental offset based on the quality

• #reverse : Interval

  Returns the same interval going in the opposite direction

• #semitones : Int32

  Returns the number of semitones the interval spans

• #simple : Interval

  Returns the simple form

• #simple? : Bool

  Returns if simple (an octave or smaller)

• #to_s(io : IO)

  Appends a short String representation of this object which includes its class name and its object address.

• #value : Int32

Constructor Detail

Instance Method Detail

class Person
  def initialize(@name : String, @age : Int32)
  end
end

Person.new("John", 32).to_s # => #<Person:0x10a199f20>