Module: MTK::Lang::Durations

Extended by:

PseudoConstants

Defined in:

lib/mtk/lang/durations.rb

Overview

Note:

Including this module defines a bunch of single-character variables, which may shadow existing variable names. Just be mindful of what is defined in this module when including it.

Defines duration constants using abbreviations for standard rhythm values (‘w’ for whole note, ‘h’ for half note, etc).

These can be thought of like constants, but in order to support the lower case names, it was necessary to define them as “pseudo constant” methods. Like constants, these methods are available either through the module (MTK::Lang::Durations::q) or via mixin (include MTK::Lang::Durations; q). They are listed under the “Instance Attribute Summary” of this page.

These values assume the quarter note is one beat, so you may find they work best with 4/4 and other */4 time signatures (although it’s certainly possible to use them with less common time signatures like 5/8).

See Also:

• Core::Duration
• Events::Note

Constant Summary

DURATIONS =

All “psuedo constants” defined in this module

[w, h, q, e, s, r, x].freeze

DURATION_NAMES =

The names of all “psuedo constants” defined in this module

See Also:

• Core::Duration::NAMES

MTK::Core::Duration::NAMES

Instance Attribute Summary

• #e ⇒ MTK::Core::Duration readonly

  eighth note: 1/2 beat(s).

• #h ⇒ MTK::Core::Duration readonly

  half note: 2 beat(s).

• #q ⇒ MTK::Core::Duration readonly

  quarter note: 1 beat(s).

• #r ⇒ MTK::Core::Duration readonly

  thirty-second note: 1/8 beat(s).

• #s ⇒ MTK::Core::Duration readonly

  sixteenth note: 1/4 beat(s).

• #w ⇒ MTK::Core::Duration readonly

  whole note: 4 beat(s).

• #x ⇒ MTK::Core::Duration readonly

  sixty-fourth note: 1/16 beat(s).

Method Summary

Methods included from PseudoConstants

define_constant

Instance Attribute Details

#e ⇒ MTK::Core::Duration (readonly)

eighth note: 1/2 beat(s)

Returns:

• (MTK::Core::Duration) —

  duration of 1/2 beat(s)

# File 'lib/mtk/lang/durations.rb', line 44

define_duration 'e', MTK::Core::Duration[Rational(1,2)], 'eighth note', '1/2'

#h ⇒ MTK::Core::Duration (readonly)

half note: 2 beat(s)

Returns:

• (MTK::Core::Duration) —

  duration of 2 beat(s)

# File 'lib/mtk/lang/durations.rb', line 40

define_duration 'h', MTK::Core::Duration[2], 'half note', 2

#q ⇒ MTK::Core::Duration (readonly)

quarter note: 1 beat(s)

Returns:

• (MTK::Core::Duration) —

  duration of 1 beat(s)

# File 'lib/mtk/lang/durations.rb', line 42

define_duration 'q', MTK::Core::Duration[1], 'quarter note', 1

#r ⇒ MTK::Core::Duration (readonly)

thirty-second note: 1/8 beat(s)

Returns:

• (MTK::Core::Duration) —

  duration of 1/8 beat(s)

# File 'lib/mtk/lang/durations.rb', line 48

define_duration 'r', MTK::Core::Duration[Rational(1,8)], 'thirty-second note', '1/8'

#s ⇒ MTK::Core::Duration (readonly)

sixteenth note: 1/4 beat(s)

Returns:

• (MTK::Core::Duration) —

  duration of 1/4 beat(s)

# File 'lib/mtk/lang/durations.rb', line 46

define_duration 's', MTK::Core::Duration[Rational(1,4)], 'sixteenth note', '1/4'

#w ⇒ MTK::Core::Duration (readonly)

whole note: 4 beat(s)

Returns:

• (MTK::Core::Duration) —

  duration of 4 beat(s)

# File 'lib/mtk/lang/durations.rb', line 38

define_duration 'w', MTK::Core::Duration[4], 'whole note', 4

#x ⇒ MTK::Core::Duration (readonly)

sixty-fourth note: 1/16 beat(s)

Returns:

• (MTK::Core::Duration) —

  duration of 1/16 beat(s)

# File 'lib/mtk/lang/durations.rb', line 50

define_duration 'x', MTK::Core::Duration[Rational(1,16)], 'sixty-fourth note', '1/16'