Public Member Functions | Data Fields | Protected Attributes

csound::VoiceleadingNode Class Reference

#include <VoiceleadingNode.hpp>

Inherits csound::Node.

Public Member Functions

Data Fields

Protected Attributes


Detailed Description

This node class imposes a sequence of one or more "voice-leading" operations upon the pitches of notes produced by children of this node. These operations comprise: prime chord (P), transpose (T), unordered pitch-class set (C, equivalent to PT), voicing (V) within a specified range of pitches, and voice-lead (L). The values of P, T, C, and V each form an additive cyclic group whose elements are defined by counting through all possible values in order. Note that C is not the same as "pitch-class set number" in the sense of M = sum over pitch-classes of (2 ^ pitch-class); it is rather one less than M. Not all combinations of operations are consistent. P requires T. PT cannot be used with C. V cannot be used with L. If neither PT nor C is specified, the existing C of the notes is used. The consistent combinations of operations are thus: PT, PTV, PTL, C, CV, CL, V, and L.


Constructor & Destructor Documentation

csound::VoiceleadingNode::VoiceleadingNode (  ) 
virtual csound::VoiceleadingNode::~VoiceleadingNode (  )  [virtual]

Member Function Documentation

virtual void csound::Node::addChild ( Node node  )  [virtual, inherited]
virtual void csound::VoiceleadingNode::apply ( Score score,
const VoiceleadingOperation priorOperation,
const VoiceleadingOperation currentOperation 
) [virtual]

Apply the current voice-leading operation to the score, within the specified range of notes. If voice-leading proper is to be performed, the prior voice-leading operation is used to determine how to lead the voices.

virtual void csound::VoiceleadingNode::C ( double  time,
double  C_ 
) [virtual]

Beginning at the specified time and continuing to the beginning of the next operation or the end of the score, whichever comes first, conform notes produced by this node or its children to the specified prime chord and transposition. Note that PT specifies what musicians normally call a chord.

virtual void csound::VoiceleadingNode::C ( double  time,
std::string  C_ 
) [virtual]

Same as PT, except that a single number is used in place of the P and T numbers.

virtual void csound::VoiceleadingNode::CL ( double  time,
double  C_,
bool  avoidParallels = true 
) [virtual]

Same as PTV, except the chord is specified by jazz-type name (e.g. EbM7) instead of P and T numbers.

virtual void csound::VoiceleadingNode::CL ( double  time,
std::string  C_,
bool  avoidParallels = true 
) [virtual]

Same as PTL, except the chord is specified by a single number instead of P and T numbers.

virtual void csound::Node::clear (  )  [virtual, inherited]
virtual ublas::matrix<double> csound::Node::createTransform (  )  [virtual, inherited]
virtual void csound::VoiceleadingNode::CV ( double  time,
std::string  C_,
double  V_ 
) [virtual]

Same as PTV, except the chord is specified by a single number instead of the P and T numbers.

virtual void csound::VoiceleadingNode::CV ( double  time,
double  C_,
double  V_ 
) [virtual]

Same as PT, except the chord can be specified by jazz-type name (e.g. EbM7) instead of P and T numbers.

virtual double& csound::Node::element ( size_t  row,
size_t  column 
) [virtual, inherited]
virtual ublas::matrix<double> csound::Node::getLocalCoordinates (  )  const [virtual, inherited]

Returns the local transformation of coordinate system.

Reimplemented in csound::Random.

virtual void csound::VoiceleadingNode::L ( double  time,
bool  avoidParallels = true 
) [virtual]

Beginning at the specified time and continuing to the beginning of the next operation or the end of the score, whichever comes first, conform notes produced by this node or its children to the specified voicing of the chord. Note that V specifies what musicians normally call the voicing or inversion of the chord.

virtual void csound::VoiceleadingNode::produceOrTransform ( Score score,
size_t  beginAt,
size_t  endAt,
const ublas::matrix< double > &  coordinates 
) [virtual]

Applies all of the stored voice-leading operations to the specified range of notes in the score. if rescaleTimes is true, the times of the operations will be rescaled to fit the times in the range of notes.

Reimplemented from csound::Node.

virtual void csound::VoiceleadingNode::PT ( double  time,
double  P_,
double  T 
) [virtual]

Beginning at the specified time and continuing to the beginning of the next operation or the end of the score, whichever comes first, conform notes produced by this node or its children to the specified prime chord and transposition. Note that PT specifies what musicians normally call a chord, e.g. "E flat major ninth." However, chords do not have to be in twelve tone equal temperament.

virtual void csound::VoiceleadingNode::PTL ( double  time,
double  P_,
double  T,
bool  avoidParallels = true 
) [virtual]

Beginning at the specified time and continuing to the beginning of the next operation or the end of the score, whichever comes first, conform notes produced by this node or its children to the specified chord; the voicing of the chord will be the smoothest voice-leading from the pitches of the previous chord. Optionally, parallel fifths can be avoided. Note that PTL specifies what musicians normally call the voice-leading of a chord.

virtual void csound::VoiceleadingNode::PTV ( double  time,
double  P_,
double  T,
double  V_ 
) [virtual]

Beginning at the specified time and continuing to the beginning of the next operation or the end of the score, whichever comes first, conform notes produced by this node or its children to the specified prime chord, transposition, and voicing. Note that PTV specifies what musicians normally call the voicing, or inversion, of a chord.

virtual void csound::Node::setElement ( size_t  row,
size_t  column,
double  value 
) [virtual, inherited]
virtual void csound::VoiceleadingNode::transform ( Score score,
bool  rescaleTime = false 
) [virtual]

Apply all of the voice-leading operations stored within this node to the score. Enables voice-leading operations to be used outside the context of a music graph.

virtual ublas::matrix<double> csound::Node::traverse ( const ublas::matrix< double > &  globalCoordinates,
Score score 
) [virtual, inherited]

The default implementation postconcatenates its own local coordinate system with the global coordinates, then passes the score and the product of coordinate systems to each child, thus performing a depth-first traversal of the music graph.

Reimplemented in csound::Hocket, and csound::Sequence.

virtual void csound::VoiceleadingNode::V ( double  time,
double  V_ 
) [virtual]

Same as PTL, except the chord is specified by jazz-type name (e.g. EbM7) instead of P and T numbers.


Field Documentation

If true (the default), voice-leadings will avoid parallel fifths.

The lowest pitch of the range of voicings, as a MIDI key number (default = 36).

std::vector<Node *> csound::Node::children [inherited]

Child Nodes, if any.

The number of equally tempered divisions of the octave (default = 12). Note that the octave is always size 12. The size of a division of the octave is then 1 in 12-tone equal temperament, 0.5 in 24-tone equal temperament, 1.33333 in 9-tone equal temperament, and so on.

ublas::matrix<double> csound::Node::localCoordinates [protected, inherited]

Voice-leading operations stored in order of starting time.

The range of voicings, from the lowest to the highest pitch, as a MIDI key number (default = 60).

If true (the default), rescale times of voice-leading operations in proportion to the duration of the notes produced by this and its child nodes.