package	rice2604hw;

/* =================================================
                RandomEnvelopeCreator
   -------------------------------------------------
   A static class which returns an array of doubles
   to be used by Jsyn as an envelope.  The numbers are
   calculated randomly, but time will add up to the
   received total time 'length'.

   =================================================
   2604                  J.Rice                10/99	
   =================================================*/
	
import java.lang.*;

//--------------------------------------------------------------------------
public class	RandomEnv {

   public static double[] getEnv(double length) {
	
      int			i, x = 0;
      double		localT = 0.0;
      double[]	d = new double[30];
      //----------------------------------
      for (i = 0; localT < length; i++) {
		
         d[i * 2] = (Math.random() * (length / 2.0)); //Calc Time
         localT = localT + d[i * 2];			//Add time to sum for comparison
			
         d[i * 2 + 1] = (Math.random());		//Calculate level
         x = i;				//<--Preserve index value to take out of loop
						
      }	//End loop
      //----------------------------------			

      d[x * 2] = d[x * 2] - (localT - length);	//trim last value to 
													//conform to total time
      d[x * 2 + 1] = 0.0;		// set last level to zero													
													
      return d;

   }
}//==========================================================================