/*
 * @(#)Implicitgrapher.java 1.0 02/04/16
 *  Graphs an implicit relation in a 
 * 
 */

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


public class Implicitgrapher extends Applet implements ActionListener, ChangeListener{
//	Button draw;
	Panel graph;
	TextField kField;
	static JSlider s;
	public static double k;
	
//======================	
//	Function to graph...
//======================
	double f(double x, double y){
				
		return x * x + 2000. * Math.cos( k * (x + y) ) + y * y - 5000.;
	}
		
		
//==========================		
//Applet's init function....
//==========================	
	public void init() {
		setLayout(null);
		
//		draw = new Button("Draw It");
//		draw.setBounds( 0, 0, 100, 20);
//		draw.addActionListener(this);
//		add(draw);
		
		graph = new Panel();
		graph.setBounds( 20, 50, 200, 200);
		graph.setBackground(Color.yellow);
		add(graph);
		
		kField=new TextField();
		kField.setBounds( 100, 0, 100, 20);
		kField.addActionListener(this);
		add(kField);
		
		s = new JSlider(5000, 8000, 6280);
		s.setBounds(20, 250, 200, 20);
		s.addChangeListener(this);
		add(s);
				
	}
	
    public void actionPerformed(ActionEvent e){
    	//graph.setBackground(Color.white);

		try 
		{
			k=Double.parseDouble(kField.getText());
		}
		catch (Exception ex)
		{
			k=0;
			kField.setText(String.valueOf(k));
		}
		Graphit();
		
}
public void Graphit(){
    	Graphics g = graph.getGraphics();
// erase the graph...
		g.setColor(Color.yellow);
		g.fillRect( 0, 0, graph.getWidth(), graph.getHeight());
		
    	g.setColor(Color.black);
    	g.translate(100, 100);
// draw axes...
    	g.drawLine(-100,   0, 100,   0);
    	g.drawLine(   0, -100,  0, 100);
// sketch the graph...
    	double t = 0,v; 
    	g.setColor(Color.blue);
    	for(double x = -100;x <= 100;x++)
    		for(double y = -100;y <= 100;y++){

    			v = f(x,y);
    			    			
    			if (t * v < 0) g.drawLine((int)x, (int)y, (int)x, (int)y);
    			t = v; 
    		}
    		
    	for(double y = -100;y <= 100;y++)
    		for(double x = -100;x <= 100;x++){
					    			
    			v = f(x,y);
    			
    			if (t * v < 0) g.drawLine((int)x, (int)y, (int)x, (int)y);
    			t = v; 
    			
    		}
   	}// actionperformed()

	public void paint(Graphics g) {
		super.paint(g);
		g.drawString("x^2 + cos(k*(x - y)) + y^2 = 1", 50, 40 );
		g.drawString("k =", 77, 15);
	}

    public void stateChanged(ChangeEvent e) {
        JSlider source = (JSlider)e.getSource();
//        if (!source.getValueIsAdjusting()) {
            k= (double) source.getValue()/1000.;
            kField.setText(String.valueOf(k));
	   		Graphit();
        }    

public static void main(String[] args){
	
// runs this applet in a window (frame)...

	Frame window = new Frame("Implicit Grapher");
	
	Implicitgrapher a= new Implicitgrapher();
	
	window.add(a);
	window.setSize(250,300);

	// anon. inner class to make exit work...
	window.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent evt) {
                System.exit(0);
            }
        });

	a.init();
	a.start();
	window.show();// displays the applet
	s.requestFocus();
	
	
	
	}
	
}
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