comparison stk/src/Envelope.cpp @ 0:4606bd505630 tip

first import

+/***************************************************/
+/*! \class Envelope
+    \brief STK linear line envelope class.
+
+    This class implements a simple linear line envelope generator
+    which is capable of ramping to an arbitrary target value by a
+    specified \e rate.  It also responds to simple \e keyOn and \e
+    keyOff messages, ramping to 1.0 on keyOn and to 0.0 on keyOff.
+
+    by Perry R. Cook and Gary P. Scavone, 1995--2014.
+*/
+/***************************************************/
+
+#include "../include/Envelope.h"
+
+namespace stk {
+
+Envelope :: Envelope( void ) : Generator()
+{    
+  target_ = 0.0;
+  value_ = 0.0;
+  rate_ = 0.001;
+  state_ = 0;
+  Stk::addSampleRateAlert( this );
+}
+
+Envelope :: ~Envelope( void )
+{
+  Stk::removeSampleRateAlert( this );
+}
+
+Envelope& Envelope :: operator= ( const Envelope& e )
+{
+  if ( this != &e ) {
+    target_ = e.target_;
+    value_ = e.value_;
+    rate_ = e.rate_;
+    state_ = e.state_;
+  }
+
+  return *this;
+}
+
+void Envelope :: sampleRateChanged( StkFloat newRate, StkFloat oldRate )
+{
+  if ( !ignoreSampleRateChange_ )
+    rate_ = oldRate * rate_ / newRate;
+}
+
+void Envelope :: setRate( StkFloat rate )
+{
+  if ( rate < 0.0 ) {
+    oStream_ << "Envelope::setRate: argument must be >= 0.0!";
+    handleError( StkError::WARNING ); return;
+  }
+
+  rate_ = rate;
+}
+
+void Envelope :: setTime( StkFloat time )
+{
+  if ( time <= 0.0 ) {
+    oStream_ << "Envelope::setTime: argument must be > 0.0!";
+    handleError( StkError::WARNING ); return;
+  }
+
+  rate_ = 1.0 / ( time * Stk::sampleRate() );
+}
+
+void Envelope :: setTarget( StkFloat target )
+{
+  target_ = target;
+  if ( value_ != target_ ) state_ = 1;
+}
+
+void Envelope :: setValue( StkFloat value )
+{
+  state_ = 0;
+  target_ = value;
+  value_ = value;
+  lastFrame_[0] = value_;
+}
+
+} // stk namespace