import jm.audio.io.*;
import jm.audio.synth.*;
import jm.music.data.Note;
import jm.audio.AudioObject;

public final class PluckInst extends jm.audio.Instrument{
	/** The points to use in the construction of Envelopes */
	private EnvPoint[] pointArray = new EnvPoint[10];
	/** The number of channels */
	private int channels;
	/** the sample rate passed to the instrument */
	private int sampleRate;
	/** the filter cutoff frequency in hertz */
	private int cutoff;
	/** A constructor to set an initial sampling rate */
	private Filter filt;
	/** The envelope to apply, by default it does nothing */
	private double[] envPoints;
	
	
	public PluckInst(int sampleRate){
		this(sampleRate, 2);
	}

	/** A constructor to set an initial sampling rate and num of chans*/
	public PluckInst(int sampleRate, int channels){
		this(sampleRate,channels, new double[] {0.0, 1.0, 1.0, 0.0});
	}
	
	/** A constructor to set initial sampling rate, channels and envelope*/
	public PluckInst(int sampleRate, int channels, double[] envPoints){
		this(sampleRate, channels, envPoints, (int)(sampleRate * 0.45));
	}
	
        /** A constructor to set initial sampling rate, channels and envelope
         *  and cutoff point.
         */	
        public PluckInst(int sampleRate, int channels, double[] envPoints, 
                         int cutoff){
		this.sampleRate = sampleRate;
		this.channels = channels;
		this.envPoints = envPoints;
		this.cutoff = cutoff;	
	}
	
	/** Initialisation method used to build the objects that this instrument
         *  will use 
         */
	public void createChain(){
		SimplePluck plk = new SimplePluck(this, this.sampleRate, this.channels);
		filt = new Filter(plk, this.cutoff, Filter.LOW_PASS);
		Volume vol = new Volume(filt);
		StereoPan span = new StereoPan(vol);
                Envelope env = new Envelope(span, this.envPoints);
		SampleOut sout = new SampleOut(env);
	}
	
	public void actionEvent(Object obj, int intValue) {
		filt.setCutOff((double)intValue);
	}
}