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#ifndef INCLUDE_ENVELOPE_H
#define INCLUDE_ENVELOPE_H
/*
* This is the Loris C++ Class Library, implementing analysis,
* manipulation, and synthesis of digitized sounds using the Reassigned
* Bandwidth-Enhanced Additive Sound Model.
*
* Loris is Copyright (c) 1999-2010 by Kelly Fitz and Lippold Haken
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY, without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* Envelope.h
*
* Definition of abstract interface class Envelope.
*
* Kelly Fitz, 21 July 2000
* loris@cerlsoundgroup.org
*
* http://www.cerlsoundgroup.org/Loris/
*
*/
#include <memory> // for autoptr
// begin namespace
namespace Loris {
// ---------------------------------------------------------------------------
// class Envelope
//
//! Envelope is an base class for objects representing real functions
//! of time.
//!
//! Class Envelope is an abstract base class, specifying interface for
//! prototypable (clonable) objects representing generic, real-valued
//! (double) functions of one real-valued (double) time argument. Derived
//! classes (like BreakpointEnvelope) must implement valueAt() and
//! clone(), the latter to support the Prototype pattern. Clients of
//! Envelope, like Morpher and Distiller, can use prototype Envelopes to
//! make their own private Envelopes.
//!
//! \sa Distiller, Envelope, Morpher
//
class Envelope
{
// -- public interface --
public:
// -- construction --
// allow compiler to generate constructors
//! Destroy this Envelope (virtual to allow subclassing).
virtual ~Envelope( void );
// -- Envelope interface --
//! Return an exact copy of this Envelope (following the Prototype
//! pattern).
virtual Envelope * clone( void ) const = 0;
//! Return the value of this Envelope at the specified time.
virtual double valueAt( double x ) const = 0;
}; // end of abstract class Envelope
// ---------------------------------------------------------------------------
// class ScaleAndOffsetEnvelope
//
//! ScaleAndOffsetEnvelope is an derived Envelope class for objects
//! representing envelopes having a scale and offset applied (in that order).
class ScaleAndOffsetEnvelope : public Envelope
{
// -- public interface --
public:
// -- construction --
//! Construct a new envelope that is a scaled and offset
//! version of another.
ScaleAndOffsetEnvelope( const Envelope & e, double scale, double offset ) :
m_env( e.clone() ),
m_scale( scale ),
m_offset( offset )
{
}
//! Construct a copy of an envelope.
ScaleAndOffsetEnvelope( const ScaleAndOffsetEnvelope & rhs ) :
m_env( rhs.m_env->clone() ),
m_scale( rhs.m_scale ),
m_offset( rhs.m_offset )
{
}
//! Assignment from another envelope.
ScaleAndOffsetEnvelope &
operator=( const ScaleAndOffsetEnvelope & rhs )
{
if ( &rhs != this )
{
m_env.reset( rhs.m_env->clone() );
m_scale = rhs.m_scale;
m_offset = rhs.m_offset;
}
return *this;
}
// -- Envelope interface --
//! Return an exact copy of this Envelope (following the Prototype
//! pattern).
ScaleAndOffsetEnvelope * clone( void ) const
{
return new ScaleAndOffsetEnvelope( *this );
}
//! Return the value of this Envelope at the specified time.
virtual double valueAt( double x ) const
{
return m_offset + ( m_scale * m_env->valueAt( x ) );
}
// -- private member variables --
private:
std::auto_ptr< Envelope > m_env;
double m_scale, m_offset;
}; // end of class ScaleAndOffsetEnvelope
// ---------------------------------------------------------------------------
// math operators
// ---------------------------------------------------------------------------
inline
ScaleAndOffsetEnvelope
operator*( const Envelope & e, double x )
{
return ScaleAndOffsetEnvelope( e, x, 0 );
}
inline
ScaleAndOffsetEnvelope
operator*( double x, const Envelope & e )
{
return e * x;
}
} // end of namespace Loris
#endif /* ndef INCLUDE_ENVELOPE_H */
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