mirror of
https://github.com/cookiengineer/audacity
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74 lines
1.5 KiB
C++
74 lines
1.5 KiB
C++
/***************************************************/
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/*! \class Envelope
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\brief STK envelope base class.
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This class implements a simple envelope
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generator which is capable of ramping to
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a target value by a specified \e rate.
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It also responds to simple \e keyOn and
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\e keyOff messages, ramping to 1.0 on
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keyOn and to 0.0 on keyOff.
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by Perry R. Cook and Gary P. Scavone, 1995 - 2005.
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*/
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/***************************************************/
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#ifndef STK_ENVELOPE_H
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#define STK_ENVELOPE_H
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#include "Generator.h"
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namespace Nyq
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{
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class Envelope : public Generator
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{
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public:
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//! Default constructor.
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Envelope(void);
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//! Copy constructor.
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Envelope( const Envelope& e );
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//! Class destructor.
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virtual ~Envelope(void);
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//! Assignment operator.
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Envelope& operator= ( const Envelope& e );
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//! Set target = 1.
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virtual void keyOn(void);
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//! Set target = 0.
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virtual void keyOff(void);
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//! Set the \e rate.
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void setRate(StkFloat rate);
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//! Set the \e rate based on a time duration.
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void setTime(StkFloat time);
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//! Set the target value.
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virtual void setTarget(StkFloat target);
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//! Set current and target values to \e aValue.
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virtual void setValue(StkFloat value);
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//! Return the current envelope \e state (0 = at target, 1 otherwise).
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virtual int getState(void) const;
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protected:
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virtual StkFloat computeSample( void );
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StkFloat value_;
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StkFloat target_;
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StkFloat rate_;
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int state_;
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};
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} // namespace Nyq
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#endif
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