/** 	
	FMSpectrumApplet.java

	GUI provides controls to plot spectrum of simple FM pair.
	
 * @author Phil Burk and Nick Didkovsky
 */
/*
 * (C) 1997 Phil Burk and Nick Didkovsky, All Rights Reserved
 * JMSL is based upon HMSL (C) Phil Burk, Larry Polansky and David Rosenboom.
 */

package jmsltutorial;

import java.awt.*;

import com.softsynth.jmsl.view.JMSLScrollbar;
import com.softsynth.jmsl.view.JMSLScrollbarProcessor;

public class FMSpectrumApplet extends java.applet.Applet implements JMSLScrollbarProcessor {

	FMSpectrumCalculator myFMSpectrumCalculator;
	SpectrumCanvas mySpectrumCanvas;

	JMSLScrollbar carrFreqScrollbar;
	JMSLScrollbar modAmpScrollbar;
	JMSLScrollbar modFreqScrollbar;
	Label carrFreqLabel;
	Label modAmpLabel;
	Label modFreqLabel;
	Label modIndexLabel;

	public void init() {
		myFMSpectrumCalculator = new FMSpectrumCalculator();
		carrFreqScrollbar = new JMSLScrollbar(this, (int) myFMSpectrumCalculator.getCarrierFreq(), 20, 20000);
		carrFreqScrollbar.setSize(320, 25);
		modAmpScrollbar = new JMSLScrollbar(this, (int) myFMSpectrumCalculator.getModAmp(), 0, 20000);
		modAmpScrollbar.setSize(320, 25);
		modFreqScrollbar = new JMSLScrollbar(this, (int) myFMSpectrumCalculator.getModFreq(), 20, 20000);
		modFreqScrollbar.setSize(320, 25);

		carrFreqLabel = new Label("Carrier Freq =" + myFMSpectrumCalculator.getCarrierFreq() + "    ");
		modAmpLabel = new Label("Mod Amp =" + myFMSpectrumCalculator.getModAmp() + "    ");
		modFreqLabel = new Label("Mod Freq =" + myFMSpectrumCalculator.getModFreq() + "    ");
		modIndexLabel = new Label("Modulation Index                    ");

		Panel controlPanel = new Panel();
		controlPanel.setLayout(new GridLayout(0, 1));

		Panel p = new Panel();
		p.add(carrFreqScrollbar);
		p.add(carrFreqLabel);
		controlPanel.add(p);

		p = new Panel();
		p.add(modAmpScrollbar);
		p.add(modAmpLabel);
		controlPanel.add(p);

		p = new Panel();
		p.add(modFreqScrollbar);
		p.add(modFreqLabel);
		controlPanel.add(p);

		p = new Panel();
		p.add(modIndexLabel);
		controlPanel.add(p);

		add(controlPanel);

		mySpectrumCanvas = new SpectrumCanvas();
		add(mySpectrumCanvas);
	}

	public void start() {
		newSpectrum();
	}

	public void stop() {

	}

	void recalculateSpectrum() {
		myFMSpectrumCalculator.setModAmp((double) modAmpScrollbar.getValue());
		myFMSpectrumCalculator.setModFreq((double) modFreqScrollbar.getValue());
		myFMSpectrumCalculator.setCarrierFreq((double) carrFreqScrollbar.getValue());
		myFMSpectrumCalculator.calculateSpectrum();
	}

	void handleModFreq() {
		modFreqLabel.setText("Mod Freq =" + modFreqScrollbar.getValue());
	}

	void handleModAmp() {
		modAmpLabel.setText("Mod Amp =" + modAmpScrollbar.getValue());
	}

	void handleCarrFreq() {
		carrFreqLabel.setText("Carrier Freq =" + carrFreqScrollbar.getValue());
	}

	void setModIndexLabel() {
		modIndexLabel.setText("Modulation Index = " + myFMSpectrumCalculator.getIndexOfModulation());
	}

	void newSpectrum() {
		recalculateSpectrum();
		setModIndexLabel();
		mySpectrumCanvas.setSpectrum(myFMSpectrumCalculator.getSpectrum());
		mySpectrumCanvas.repaint();
	}

	public void JMSLScrollbarValueChanged(JMSLScrollbar jsb) {
		if (jsb == modFreqScrollbar)
			handleModFreq();
		if (jsb == modAmpScrollbar)
			handleModAmp();
		if (jsb == carrFreqScrollbar)
			handleCarrFreq();
		newSpectrum();
	}
}