//QuadraticApplet.java

import java.text.*; 
import java.awt.*;
import java.awt.event.*;   
import javax.swing.*;
import javax.swing.event.*;

public class LissajousApplet extends JApplet implements ActionListener {
                            
    JLabel aLabel, bLabel, xLowLabel, xHighLabel, yLowLabel, yHighLabel, tickIntervalLabel;
    JTextField aField, bField, 
	xLowField, xHighField, yLowField, yHighField, tickIntervalField;
    JButton aUpButton, aDownButton, bUpButton, bDownButton, zoomInButton, zoomOutButton;
    JSlider horizSlider, vertSlider;
    LissajousPlotPanel lissajousPlotPanel;
    double xLo=-1.1, xHi=1.1, yLo=-1.1, yHi=1.1, tickInt=1;
    double a, b;
    
    public void init() {  

	//int westpanelwidth=20;
	
	Container container = getContentPane();  
	container.setLayout(null);   //** no Layout Manager	
	
	lissajousPlotPanel = new LissajousPlotPanel();
	if (getHeight() < getWidth())
	    lissajousPlotPanel.setBounds(60,50,getHeight()-60,getHeight()-50);
	else
	    lissajousPlotPanel.setBounds(60,50,getWidth()-60,getWidth()-50);
	container.add(lissajousPlotPanel);

/*	JPanel westPanel = new JPanel();
	westPanel.setLayout( new GridLayout(4,1) ); 
	westPanel.setBackground(Color.LIGHT_GRAY);
	westPanel.setBounds(0,0, westpanelwidth,200);
	//westPanel.setLayout(null); 
	container.add(westPanel);
*/
        /*	
	JPanel coeffsPanel = new JPanel();
	coeffsPanel.setLayout(new FlowLayout());
	westPanel.add(coeffsPanel);
	*/
	/*
	JPanel plotXPanel = new JPanel();
	plotXPanel.setLayout(new FlowLayout());
	westPanel.add(plotXPanel);
	JPanel plotYPanel = new JPanel();
	plotYPanel.setLayout(new FlowLayout());
	westPanel.add(plotYPanel);
	JPanel plotTickPanel = new JPanel();
	plotTickPanel.setLayout(new FlowLayout());
	westPanel.add(plotTickPanel);
        */

	JPanel zoomPanel = new JPanel();
	zoomPanel.setBackground(Color.BLACK);
	//zoomPanel.setBounds(0,getHeight()-200, westpanelwidth,40);
	zoomPanel.setBounds(getWidth()-200,0, 200,40);
	container.add(zoomPanel);

	JLabel formulaLabel = new JLabel( "x=cos(at) y=sin(bt)" );
	formulaLabel.setBounds(1,5,120,20);
	container.add( formulaLabel );
	

	aLabel = new JLabel( "a" );
	//coeffsPanel.add( aLabel );
	aLabel.setBounds(20,140,20,20);
	container.add( aLabel );
	aField = new JTextField("3",3 );
	aField.setBounds(5,160,40,20);
	aField.setHorizontalAlignment(JTextField.RIGHT);
	aField.addActionListener( this );
	container.add( aField );
	//coeffsPanel.add( aField );
	aUpButton = new JButton( "\u2191" );
	aUpButton.setBounds(0,180,50,20);
	container.add( aUpButton );
	aUpButton.addActionListener( this );
	
	aDownButton = new JButton( "\u2193" );
	aDownButton.setBounds(0,200,50,20);
	container.add( aDownButton );
	aDownButton.addActionListener( this );
	
	bLabel = new JLabel( "b" );
	//coeffsPanel.add( bLabel );
	bLabel.setBounds(200,10,20,20);
	container.add( bLabel );
	bField = new JTextField("5",3 );
	bField.setBounds(220,10,40,20);
	bField.setHorizontalAlignment(JTextField.RIGHT);
	bField.addActionListener( this );
	container.add( bField );
	//coeffsPanel.add( bField );
	bUpButton = new JButton( "\u2191" );
	bUpButton.setBounds(260,5,50,20);
	container.add( bUpButton );
	bUpButton.addActionListener( this );
	
	bDownButton = new JButton( "\u2193" );
	bDownButton.setBounds(260,25,50,20);
	container.add( bDownButton );
	bDownButton.addActionListener( this );
	
        /*
	xLowLabel = new JLabel( "X low" );
	plotXPanel.add( xLowLabel );
	xLowField = new JTextField( "-1",3 );
	xLowField.setHorizontalAlignment(JTextField.RIGHT);
	xLowField.addActionListener( this );
	plotXPanel.add( xLowField );
	
	xHighLabel = new JLabel( "X high" );
	plotXPanel.add( xHighLabel );
	xHighField = new JTextField( "1",3 );
	xHighField.setHorizontalAlignment(JTextField.RIGHT);
	xHighField.addActionListener( this );
	plotXPanel.add( xHighField );
	
	yLowLabel = new JLabel( "Y low" );
	plotYPanel.add( yLowLabel );
	yLowField = new JTextField( "-1",3 );
	yLowField.setHorizontalAlignment(JTextField.RIGHT);
	yLowField.addActionListener( this );
	plotYPanel.add( yLowField );
	
	yHighLabel = new JLabel( "Y high" );
	plotYPanel.add( yHighLabel );
	yHighField = new JTextField( "1",3 );
	yHighField.setHorizontalAlignment(JTextField.RIGHT);
	yHighField.addActionListener( this );
	plotYPanel.add( yHighField );
	
	tickIntervalLabel = new JLabel( "Tick interval" );
	plotTickPanel.add( tickIntervalLabel );
	tickIntervalField = new JTextField( "1",2 );
	tickIntervalField.setHorizontalAlignment(JTextField.RIGHT);
	tickIntervalField.addActionListener( this );
	plotTickPanel.add( tickIntervalField );
        */
	horizSlider = new JSlider( SwingConstants.HORIZONTAL, 0, 100, 30 );
	horizSlider.setMajorTickSpacing( 10 );
	//horizSlider.setMinorTickSpacing( 1 );
	horizSlider.setPaintTicks( true );
	//horizSlider.setPaintLabels( true );
	horizSlider.setBounds(310,0,210,40);
	container.add(horizSlider);
    	horizSlider.addChangeListener(
	        new ChangeListener() {
		    public void stateChanged( ChangeEvent e ) {
			bField.setText(""+(horizSlider.getValue()/10.0));
			bField.postActionEvent();  
		    }
		}
	);
	
	vertSlider = new JSlider( SwingConstants.VERTICAL, 0, 100, 50);
	vertSlider.setMajorTickSpacing( 10 );
	//vertSlider.setMinorTickSpacing( 1 );
	vertSlider.setPaintTicks( true );
	//vertSlider.setPaintLabels( true );
	vertSlider.setBounds(10,220,40,200);
	container.add(vertSlider);
    	vertSlider.addChangeListener(
	        new ChangeListener() {
		    public void stateChanged( ChangeEvent e ) {
			aField.setText(""+(vertSlider.getValue()/10.0));
			aField.postActionEvent();  
		    }
		}
	);
	

	zoomInButton = new JButton( "Zoom IN" );
	zoomPanel.add( zoomInButton );
	zoomInButton.addActionListener( this );
	
	zoomOutButton = new JButton( "Zoom OUT" );
	zoomPanel.add( zoomOutButton );
	zoomOutButton.addActionListener( this );

	aField.postActionEvent();  
    }


    public void actionPerformed( ActionEvent event ) {

	double aTry, bTry;
	
        DecimalFormat d2, d1;
	d2 = new DecimalFormat ("0.00");
	d1 = new DecimalFormat ("0.0");

	if ( event.getSource() == aField || event.getSource() == bField ) {
	    try {
	        aTry = Double.parseDouble(aField.getText());
	        bTry = Double.parseDouble(bField.getText());
	    }
	    catch (NumberFormatException e) {
	        JOptionPane.showMessageDialog(null,
					  "a, and b must be numbers",
					  "Quadratic: Invalid input",
					  JOptionPane.ERROR_MESSAGE);
	        return;
	    }
	    
	    a = aTry;
	    b = bTry;
	    horizSlider.setValue((int)(b*10));  //doesn't invoke handler?
	    vertSlider.setValue ((int)(a*10));
	}
		
//	double xLo, xHi, yLo, yHi, tickInt;
/*	try {
	    xLo = Double.parseDouble(xLowField.getText());
	    xHi = Double.parseDouble(xHighField.getText());
	    yLo = Double.parseDouble(yLowField.getText());
	    yHi = Double.parseDouble(yHighField.getText());
	    tickInt = Double.parseDouble(tickIntervalField.getText());
	}
	catch (NumberFormatException e) {
	    JOptionPane.showMessageDialog(null,
					  "Plotting coordinates must be numbers",
					  "Quadratic plotting: Invalid input",
					  JOptionPane.ERROR_MESSAGE);
	    return;
	}

	if (xLo>xHi || yLo>yHi || tickInt<=0) {
	    JOptionPane.showMessageDialog(null,
					  "Bad plotting coordinates",
					  "Quadratic plotting: Invalid input",
					  JOptionPane.ERROR_MESSAGE);
	    return;
	}
*/
	else if ( event.getSource() == aUpButton ) {
	    a += .1;
	    aField.setText(""+d1.format(a));
	    vertSlider.setValue ((int)(a*10));
	}
	else if ( event.getSource() == aDownButton ) {
	    if (a >= .1)
	        a -= .1;
	    else
	    	a = 0;
	    aField.setText(""+d1.format(a));
	    vertSlider.setValue ((int)(a*10));
	}
	else if ( event.getSource() == bUpButton ) {
	    b += .1;
	    bField.setText(""+d1.format(b));
	    horizSlider.setValue ((int)(b*10));
	}
	else if ( event.getSource() == bDownButton ) {
	    if (b >= .1)
	        b -= .1;
	    else
	    	b = 0;
	    bField.setText(""+d1.format(b));
	    horizSlider.setValue ((int)(b*10));
	}

	if ( event.getSource() == zoomInButton ) {
	    double scale = .9;   //shrink the grid by 10%
	    xLo *= scale;
	    xHi *= scale;
	    yLo *= scale;
	    yHi *= scale;
	    /*xLowField.setText(""+d2.format(xLo));
	    xHighField.setText(""+d2.format(xHi));
	    yLowField.setText(""+d2.format(yLo));
	    yHighField.setText(""+d2.format(yHi));
	    *///repaint();    
	}
	else if ( event.getSource() == zoomOutButton ) {
	    double scale = 1.1;   //grow the grid by 10%
	    xLo *= scale;
	    xHi *= scale;
	    yLo *= scale;
	    yHi *= scale;
	/*    xLowField.setText(""+d2.format(xLo));
	    xHighField.setText(""+d2.format(xHi));
	    yLowField.setText(""+d2.format(yLo));
	    yHighField.setText(""+d2.format(yHi));
	  */  //repaint();    
	}

	int numPoints=5000;
	double [] X = new double[numPoints];
        double [] Y = new double[numPoints];
        double dt = 2*Math.PI/numPoints;
        double t=0;
        for (int i=0; i<X.length; i++) {
            X[i] = Math.cos(a * t);
            Y[i] = Math.sin(b * t);
            t += dt;
        }
        lissajousPlotPanel.newPlot(X,Y, a,b,xLo,xHi,yLo,yHi,tickInt);

    }

}