/**********************************************
 *  Swing application for polynomial graphs   *                       
 *  Created by: Vivian Synteta                *
 *              (synteta8@etu.unige.ch)       *
 *  Date: 12/06/2000  (updated 13/06/2000)    *
 *  For staf2x course (Daniel Schneider)      *
 **********************************************/

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

public class graph extends Applet implements ActionListener, ChangeListener {

    Plotter plotter;
    JTextField x_min, x_max;
    JTextField y_min, y_max;
    JLabel function;

    JSlider [] slider = new JSlider[3];
    double [] coefs = new double[3];


    public Component createComponents() {

	// define general panel
	JPanel pane = new JPanel();
	pane.setBackground(Color.white);
	pane.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));
	pane.setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints ();

	// ------- components --------

	// title
	JLabel title = new JLabel("Vivian's Polynomial Plotter");
	title.setFont(new Font("Dialog",Font.BOLD,16));
	title.setForeground(Color.red);
	// constraints for title
	gbc.insets = new Insets(5,5,5,5);
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 5;
        gbc.gridheight = 1;
	gbc.weightx = 1.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	// add title
	pane.add(title, gbc);

	// constraints for plotter
	plotter = new Plotter();
	plotter.coefs = coefs;
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.gridwidth = 5;
        gbc.gridheight = 1;
	gbc.weightx = 1.0;
	gbc.weighty = 1.0;
        gbc.fill = GridBagConstraints.BOTH;
        gbc.anchor = GridBagConstraints.CENTER;
	pane.add(plotter, gbc);


	// constraints for function
	// -----------------------------------
        function = new JLabel("f(x) = 0");
	function.setFont(new Font("Dialog",0,20));
	function.setBorder(BorderFactory.createEmptyBorder(2,2,2,2));
        gbc.gridx = 0;
        gbc.gridy = 2;
        gbc.gridwidth = 5;
        gbc.gridheight = 1;
	gbc.weightx = 1.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(function, gbc);

	//----------------------------------------
	//----------------------------------------


	// constraints for limits
        JLabel limits = new JLabel("LIMITS");
	limits.setForeground(Color.red);
        gbc.gridx = 0;
        gbc.gridy = 3;
        gbc.gridwidth = 1;
        gbc.gridheight = 2;
	gbc.weightx = 0.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(limits, gbc);


	// constraints for label x_min
        JLabel labelmin = new JLabel("Xmin");
        gbc.gridx = 1;
        gbc.gridy = 3;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
	gbc.weightx = 0.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(labelmin, gbc);


	// constraints for x_min
        x_min = new JTextField("-10");
	plotter.x_min = -10;
	plotter.x_max = 10;
	x_min.addActionListener(this);
        gbc.gridx = 2;
        gbc.gridy = 3;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
	gbc.weightx = 1.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(x_min, gbc);

	// constraints for label x_max
        JLabel labelmax = new JLabel("Xmax");
        gbc.gridx = 3;
        gbc.gridy = 3;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
	gbc.weightx = 0.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(labelmax, gbc);

	// constraints for x_max
        x_max = new JTextField("10");
	x_max.addActionListener(this);
        gbc.gridx = 4;
        gbc.gridy = 3;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
	gbc.weightx = 1.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(x_max, gbc);


	// constraints for label y_min
        labelmin = new JLabel("Ymin");
        gbc.gridx = 1;
        gbc.gridy = 4;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
	gbc.weightx = 0.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(labelmin, gbc);


	// constraints for y_min
        y_min = new JTextField("-10");
	plotter.y_min = -10;
	plotter.y_max = 10;
	y_min.addActionListener(this);
        gbc.gridx = 2;
        gbc.gridy = 4;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
	gbc.weightx = 1.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(y_min, gbc);

	// constraints for label y_max
        labelmax = new JLabel("Ymax");
        gbc.gridx = 3;
        gbc.gridy = 4;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
	gbc.weightx = 0.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(labelmax, gbc);

	// constraints for y_max
        y_max = new JTextField("10");
	y_max.addActionListener(this);
        gbc.gridx = 4;
        gbc.gridy = 4;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
	gbc.weightx = 1.0;
	gbc.weighty = 0.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.WEST;
	pane.add(y_max, gbc);


	for (int i=0; i<coefs.length; i++) {
	    coefs[i] = 0;
	    // constraints for slider label(i)
	    JLabel label = new JLabel("a["+(coefs.length-i-1)+"]:");
	    gbc.gridx = 0;
	    gbc.gridy = 5+i;
	    gbc.gridwidth = 1;
	    gbc.gridheight = 1;
	    gbc.weightx = 0.0;
	    gbc.weighty = 0.0;
	    gbc.fill = GridBagConstraints.HORIZONTAL;
	    gbc.anchor = GridBagConstraints.WEST;
	    pane.add(label, gbc);

	    // constraints for slider label(i)
	    slider[i] = new JSlider(JSlider.HORIZONTAL, -20, 20, 0);
	    slider[i].addChangeListener(this);
	    slider[i].setMajorTickSpacing(5);
	    slider[i].setMinorTickSpacing(1);
	    slider[i].setPaintLabels(true);
	    slider[i].setPaintTicks(true);
	    slider[i].setSnapToTicks(true);
	    slider[i].setBackground(Color.white);
	    //	    slider[i].setForeground(Color.red);

	    gbc.gridx = 1;
	    gbc.gridy = 5+i;
	    gbc.gridwidth = 4;
	    gbc.gridheight = 1;
	    gbc.weightx = 1.0;
	    gbc.weighty = 0.0;
	    gbc.fill = GridBagConstraints.HORIZONTAL;
	    gbc.anchor = GridBagConstraints.WEST;
	    pane.add(slider[i], gbc);

	}
	showFunction();
	return pane;
    }

    public void showFunction() {
	String func = "f(x) = ";
	for (int i=0; i<coefs.length; i++) {
	    if (coefs[i] >= 0.0)
		func = func + " + " + coefs[i];
	    else
		func = func + coefs[i];
	    if (i==coefs.length-1) break;
	    func = func + " x^" + (coefs.length-i-1) + " ";
	}
       	function.setText(func);
    }


    public void actionPerformed(ActionEvent event) {
	if (event.getSource() == x_min) {
	    plotter.x_min = Double.valueOf(x_min.getText()).doubleValue();
	    plotter.repaint();
	} 
	if (event.getSource() == x_max) {
	    plotter.x_max = Double.valueOf(x_max.getText()).doubleValue();
	    plotter.repaint();
	} 
	if (event.getSource() == y_min) {
	    plotter.y_min = Double.valueOf(y_min.getText()).doubleValue();
	    plotter.repaint();
	} 
	if (event.getSource() == y_max) {
	    plotter.y_max = Double.valueOf(y_max.getText()).doubleValue();
	    plotter.repaint();
	} 
    }

    // ----------- for the applet ----------------
    // -------------------------------------------
    public void stateChanged(ChangeEvent event) {
	for (int i=0; i<slider.length; i++) {
	    if (event.getSource() == slider[i]) {
		coefs[i] = slider[i].getValue();
		plotter.repaint();
	    }
	}
	showFunction();
    }



    public void init() {
	graph app = new graph();
	add(createComponents());
	//add(contents, BorderLayout.CENTER);
	//pack();
	setSize(300,400);
	setVisible(true);
    }

    // ----------- for the application -----------
    // -------------------------------------------
    public static void main (String [] args ) {
	JFrame frame = new JFrame("Vivian's swing application for polynomial graphs");
	graph app = new graph();

	Component contents = app.createComponents();
	frame.getContentPane().add(contents, BorderLayout.CENTER);
	frame.addWindowListener(new WindowAdapter() {
		public void windowClosing(WindowEvent e) {
		    System.exit(0);
		}
	    });

	frame.pack();
	//frame.setSize(400,600);
	frame.show();
    }
}