Version 0.99

Envelope.h

@@ -0,0 +1,40 @@
+/*******************************************/
+/*  Envelope Class, Perry R. Cook, 1995-96 */ 
+/*  This is the base class for envelopes.  */
+/*  This one is capable of ramping state   */
+/*  from where it is to a target value by  */
+/*  a rate.  It also responds to simple    */
+/*  KeyOn and KeyOff messages, ramping to  */         
+/*  1.0 on keyon and to 0.0 on keyoff.     */
+/*  There are two tick (update value)      */
+/*  methods, one returns the value, and    */
+/*  other returns 0 if the envelope is at  */
+/*  the target value (the state bit).      */
+/*******************************************/
+
+#if !defined(__Envelope_h)
+#define __Envelope_h
+
+#include "Object.h"
+
+class Envelope : public Object
+{
+  protected:  
+    MY_FLOAT value;
+    MY_FLOAT target;
+    MY_FLOAT rate;
+    int state;
+  public:
+    Envelope();
+    ~Envelope();
+    void keyOn();
+    void keyOff();
+    void setRate(MY_FLOAT aRate);
+    void setTarget(MY_FLOAT aTarget);
+    void setValue(MY_FLOAT aValue);
+    MY_FLOAT tick();
+    int informTick();
+    MY_FLOAT lastOut();
+};
+
+#endif