/Users/kfitz/Projects/Loris/Loris development/src/Envelope.h

#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
//
//
class Envelope
{
//      -- public interface --
public:
//      -- construction --

    // allow compiler to generate constructors

        virtual ~Envelope( void );

//      -- Envelope interface --

        virtual Envelope * clone( void ) const = 0;

        virtual double valueAt( double x ) const = 0;   
        
};      //      end of abstract class Envelope


// ---------------------------------------------------------------------------
//      class ScaleAndOffsetEnvelope
//

class ScaleAndOffsetEnvelope : public Envelope
{
//      -- public interface --
public:
//      -- construction --

    ScaleAndOffsetEnvelope( const Envelope & e, double scale, double offset ) :
        m_env( e.clone() ),
        m_scale( scale ),
        m_offset( offset )
    {
    }

        ScaleAndOffsetEnvelope( const ScaleAndOffsetEnvelope & rhs ) :
                m_env( rhs.m_env->clone() ),
        m_scale( rhs.m_scale ),
        m_offset( rhs.m_offset )
    {
    }

        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 --

        ScaleAndOffsetEnvelope * clone( void ) const 
        {
                return new ScaleAndOffsetEnvelope( *this );
        }

        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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