import java.awt.*;
import java.awt.event.*;

/*
<applet code="Lissajous.class" width="535" height="270"> </applet>
*/

public class Lissajous extends java.applet.Applet {
	LissajousCanvas MyCanvas;
	ControlPanel MyPanel;

	public void init() {
		setLayout(new GridLayout(1,2,5,10));
		MyCanvas = new LissajousCanvas(this);
		MyPanel = new ControlPanel(this);
		add(MyCanvas);
		add(MyPanel);
	}

	public void paint(Graphics g) {
		MyPanel.setBackground(Color.lightGray);
		MyCanvas.setBackground(Color.lightGray);
		MyPanel.paint(g);
	}

	public Insets getInsets() {
		return new Insets (5, 5, 5, 5);
	}

	public void update(Graphics g) {
		 MyCanvas.paint(g);
	}
}

// **************************** MYCANVAS CLASS ********************

class LissajousCanvas extends Canvas {
	Lissajous outerparent;
	public int W, H;
	double fx=1.0, fy=1.0, phase=0.0;

	LissajousCanvas (Lissajous outerparent) {
		this.outerparent = outerparent;
		Rectangle r = outerparent.getBounds();
		W = (r.width) / 2;
		H = r.height;
	}

	int gcd (int one, int two) {
		if (one < two)
			return gcd(two, one);
		else
			if (two == 0)
				return one;
			else
				return gcd (two, one % two);
	}

	public void paint (Graphics g) {
		int x, y, lastx=0, lasty=0, w = this.getSize().width, h = this.getSize().height;
		double t, max, ww=0.5*(double)w, hh=0.5*(double)h;

// 		g.drawRect(0, 0, w-1, h-1);
 		max = 2.0 * Math.PI * Math.max(fx, fy) / (double)gcd((int)fx,(int)fy);
 		for (t = 0.0; t <= max ; t += 0.03125) {
			x = (int) Math.round(ww * Math.sin(t * (fy>fx ? fx/fy : 1.0)));
			y = (int) Math.round(hh * Math.sin(t * (fy>fx ? 1.0 : fy/fx) + phase));
			if (t == 0.0) { lastx=x; lasty=y; }
 			g.drawLine(lastx+w/2, lasty+h/2, x+w/2, y+h/2);
 			lastx = x;
 			lasty = y;
 		}
	}

	public void setValue (int which, int what) {
		switch (which) {
			case 1: fx = (double) what; break;
			case 2: fy = (double) what; break;
			case 3: phase = (double) what; break;
			default:
		}
		repaint();
	}

}


// ******************* MYPANEL CLASS *************************

class ControlPanel extends Panel {
	Scrollbar freq1, freq2, phase;
	Label lfreq1, lfreq2, lphase;
	Lissajous parent;

	ControlPanel(Lissajous parent) {
		this.parent = parent;
		freq1 = new Scrollbar(Scrollbar.HORIZONTAL,1,1,1,100);
		freq2 = new Scrollbar(Scrollbar.HORIZONTAL,1,1,1,100);
		phase = new Scrollbar(Scrollbar.HORIZONTAL,0,1,0,180);
		freq1.setBlockIncrement(5);
		freq2.setBlockIncrement(5);
		phase.setBlockIncrement(15);
		lfreq1 = new Label("1", Label.CENTER);
		lfreq2 = new Label("1", Label.CENTER);
		lphase = new Label("0", Label.CENTER);

		GridBagLayout gridbag = new GridBagLayout();
		GridBagConstraints c = new GridBagConstraints ();
		setLayout(gridbag);
		setFont(new Font("Helvetica", Font.BOLD, 14));
		make_static_label("Lissajous Lab",gridbag, c);
		c.fill = GridBagConstraints.BOTH;
		c.weightx = 1.0;
		c.gridwidth = 1;

		make_static_label("           ",gridbag, c);
		make_static_label("Frequency 1", gridbag, c);
		make_scroll(freq1, gridbag, c);
		make_dynamic_label(lfreq1, gridbag, c);
		lfreq1.setText(String.valueOf(1));
		make_static_label("Frequency 2", gridbag, c);
		make_scroll(freq2, gridbag, c);
		make_dynamic_label(lfreq2, gridbag, c);
		lfreq2.setText(String.valueOf(1));
		make_static_label("Phase",gridbag, c);
		make_scroll(phase, gridbag, c);
		make_dynamic_label(lphase, gridbag, c); 
		lphase.setText(String.valueOf(0));

		freq1.addAdjustmentListener(new ScrollbarAL(1, lfreq1));
		freq2.addAdjustmentListener(new ScrollbarAL(2, lfreq2));
		phase.addAdjustmentListener(new ScrollbarAL(3, lphase));
	}

	void setValue (int which, int what) {
		parent.MyCanvas.setValue(which, what);
	}

	public void init() {
		freq1.setValue(1);
		freq2.setValue(1);
		phase.setValue(0);
		lfreq1.setText("1");
		lfreq2.setText("1");
		lphase.setText("0");
	}

	public void paint(Graphics g) {
//		Dimension d = getSize();
//		g.setColor(new Color(0, 0, 0));
//		g.draw3DRect(0, 7, d.width-1, d.height-10, false);
	}

	protected void make_scroll(Scrollbar tempsc, GridBagLayout gridbag, GridBagConstraints c) {
		c.weightx = 0.0;
		c.gridwidth = GridBagConstraints.REMAINDER;
		gridbag.setConstraints(tempsc, c);
		add(tempsc);
	}

	protected void make_static_label(String name, GridBagLayout gridbag, GridBagConstraints c) {
		Label label = new Label(name, Label.CENTER);
		c.weightx = 0.0;
		c.gridwidth = GridBagConstraints.REMAINDER;
		gridbag.setConstraints(label, c);
		add(label);
	}

	protected void make_dynamic_label(Label temptex, GridBagLayout gridbag, GridBagConstraints c) {
		c.weightx = 1.0;
		c.gridwidth = GridBagConstraints.REMAINDER;
		gridbag.setConstraints(temptex, c);
		add(temptex); 
	}

	class ScrollbarAL implements AdjustmentListener {
		int scrollbar;
		Label theLabel;
		ScrollbarAL (int _scrollbar, Label _theLabel) {
			scrollbar = _scrollbar;
			theLabel = _theLabel;
		}
		public void adjustmentValueChanged(AdjustmentEvent e) {
			int temp = e.getValue();
			theLabel.setText(String.valueOf(temp));
			setValue(scrollbar, temp);
		}
	}
}