inheritance tree
PitchClassMixin
class definition
[abstract class] PitchClassMixin defines a complementary pitch representation to extend the standard Strasheela Note class (as defined in ScoreCore.oz). In the standard class, on the one hand, the pitch is represented by a single parameter whose meaning depends on the pitch unit (possible units are, e.g., 'frequency' or 'pitch'). The present mixin for the note class, on the other hand, defines two additional parameters to represent pitch in an alternative way: pitchClass and octave. The mixin also constrains the obvious relation between these three parameters (with the help of PitchClassToPitch, see there).
As a consequence, the possible pitch units for the parameter pitch is more limited (e.g. 'frequency' is not valid anymore). However, arbitrary equidistant microtonal divisions of the octave are still possible. The pitches per octave are set globally (with DB.setPitchesPerOctave), and the pitch unit of all note parameters pitch and pitch class are set implicitly. This means that the term 'pitch class' has a broader meaning here than it has in dodecaphonic music analysis: only in case there are 12 pitches per octave the term 'pitch class' has Forte's meaning.
PitchClassMixin is defined as a mixin to the class Score.note to make it more easy to combine this mixin with other extensions to the note class. In Oz, multiple superclasses must not have a common class as their superclasses. Therefore, multiple note subclasses can not be directly combined, but multiple mixins for the note class can..
class PitchClassMixin (Inheritance-free)
feat !PitchClassMixinType
attr octave pitchClass
- getOctave(X)
- getOctaveParameter(X)
- getPitchClass(X)
- getPitchClassParameter(X)
- initPitchClassMixin(octave:Oct pitchClass:PC)
end
