URGENT HELP REQUIRED _ Creating Labels for Triangle

Question

Hi everyone... the code below is my application - Pythagoras Theorem.. or rather displaying it.. But i have not been able to get the Vertex of the triangle Labelled as A B C... I need to do that and change the Triangle Table data to A B C insted of Horizontal Vertical and Hypotenuise and as the triangle is stretched on screen A B And C keep moving as well ...
Besides i need to Show this in the tabel
- Values of A ^ 2 , B^2 and C ^2 as welll as a row showing A^2+B^2 = C^2
the code is as follows..
This is the main class called Geometry
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
import java.lang.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.FileDialog;
import java.io.*;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
public class Geometry {
    CardLayout cards;
    JPanel panel;
    public Geometry() {
        cards = new CardLayout();
        panel = new JPanel(cards);
        addCards();
        JFrame f = new JFrame("Geometry");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setJMenuBar(getMenuBar());
        f.getContentPane().add(panel);
        f.setSize(500,500);
        f.setLocation(0,0);
        f.setVisible(true);
        f.addMouseMotionListener(
        new MouseMotionListener() { //anonymous inner class
            //handle mouse drag event
            public void mouseMoved(MouseEvent e) {
               System.out.println("Mouse  " + e.getX() +","  + e.getY());
            public void mouseDragged(MouseEvent e) {
                System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
        //            public void mouseMoved(MouseEvent me) {
        //                System.out.println("Moving: x=" + me.getX() + "; y=" + me.getY());
        //        panel.addMouseMotionListener(
        //        new MouseMotionListener() { //anonymous inner class
        //            //handle mouse drag event
        //           public void mouseDragged(MouseEvent me) {
        //               setTitle("Dragging: x=" + me.getX() + "; y=" + me.getY());
        //            public void mouseMoved(MouseEvent me) {
        //                setTitle("Moving: x=" + me.getX() + "; y=" + me.getY());
    private void addCards() {
        // card one
        TriangleModel tri = new TriangleModel(175,100,175,250,325,250);
        TriangleView view  = new TriangleView(tri);
        JPanel panelOne = new JPanel(new BorderLayout());
        panelOne.add(view.getUIPanel(), "North");
        panelOne.add(view);
        panelOne.add(view.getTablePanel(), "South");
        panelOne.setName("Pythagoras's Theorem");
        panel.add("Pythagoras's Theorem", panelOne);
              view.addMouseMotionListener(
        new MouseMotionListener() { //anonymous inner class
            //handle mouse drag event
             public void mouseMoved(MouseEvent e) {
                System.out.println("Mouse at " + e.getX() +","  + e.getY());
           public void mouseDragged(MouseEvent e) {
               System.out.println("Dragging: x=" + e.getX() + "; y=" + e.getY());
        // card two
        TestModel trin = new TestModel(175,100,175,250,325,250);
        TestView viewn  = new TestView(trin);
        JPanel panelTwo = new JPanel(new BorderLayout());
        panelTwo.add(viewn.getUIPanel(), "North");
      // panelTwo.setBackground(Color.blue);
        panelTwo.setName("Similar Triangles");
        panelTwo.add(viewn);
        panelTwo.add(viewn.getTablePanel(), "South");
              viewn.addMouseMotionListener(
        new MouseMotionListener() { //anonymous inner class
            //handle mouse drag event
             public void mouseMoved(MouseEvent e) {
                System.out.println("Mouse at " + e.getX() +","  + e.getY());
           public void mouseDragged(MouseEvent e) {
               System.out.println("Dragging: x=" + e.getX() + "; y=" + e.getY());
        panel.add("Similar Triangles", panelTwo);
        JPanel panelThree = new JPanel();
        panelThree.setBackground(Color.white);
        panelThree.setName("Circle Theorem1");
        panel.add("Circle Theorem1", panelThree);
    private JMenuBar getMenuBar() {
        JMenu File = new JMenu("File");
        JSeparator separator1 = new JSeparator();
        JMenuItem Open = new JMenuItem("Open");
//         Open.addActionListener(new java.awt.event.ActionListener() {
//            public void actionPerformed(java.awt.event.ActionEvent evt) {
//                openActionPerformed(evt);
        JMenuItem Save = new JMenuItem("Save");
        JMenuItem Print = new JMenuItem("Print");
        JMenuItem Exit = new JMenuItem("Exit");
        Exit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                ExitActionPerformed(evt);
        JMenu theorem = new JMenu("Theorem");
        ActionListener l = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JMenuItem item = (JMenuItem)e.getSource();
                String name = item.getActionCommand();
                cards.show(panel, name);
        Component[] c = panel.getComponents();
        for(int j = 0; j < panel.getComponentCount(); j++) {
            String name = c[j].getName();
            JMenuItem item = new JMenuItem(name);
            item.setActionCommand(name);
            item.addActionListener(l);
            theorem.add(item);
        JMenuBar menuBar = new JMenuBar();
        JMenuBar menuBar1 = new JMenuBar();
        menuBar.add(File);
        File.add(Open);
        File.add(separator1);
        File.add(Save);
        File.add(Print);       
        File.add(Exit);
        menuBar.add(theorem);
        return menuBar;
//    private void openActionPerformed(java.awt.event.ActionEvent evt) {
//        FileDialog fileDialog = new FileDialog(this, "Open...", FileDialog.LOAD);
//        fileDialog.show();
//        if (fileDialog.getFile() == null)
//            return;
//        fileName = fileDialog.getDirectory() + File.separator + fileDialog.getFile();
//        FileInputStream fis = null;
//        String str = null;
//        try {
//            fis = new FileInputStream(fileName);
//            int size = fis.available();
//            byte[] bytes = new byte [size];
//            fis.read(bytes);
//            str = new String(bytes);
//        } catch (IOException e) {
//        } finally {
//            try {
//                fis.close();
//            } catch (IOException e2) {
//        if (str != null)
//            textBox.setText(str);
    private void ExitActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        System.exit(0);
    public static void main(String[] args) {
        new Geometry();
}import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
public class Triangle
public Triangle()
TriangleModel tri = new TriangleModel(175,100,175,250,325,250);
TriangleView view = new TriangleView(tri);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(view.getUIPanel(), "North");
f.getContentPane().add(view);
f.getContentPane().add(view.getTablePanel(), "South");
f.setSize(500,500);
f.setLocation(200,200);
f.setVisible(true);
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import javax.swing.JTable;
import javax.swing.event.MouseInputAdapter;
* TriangleControl.java
* Created on 06 February 2005, 01:19
* @author  Rahindra Naidoo
public class TriangleControl extends MouseInputAdapter
    TriangleView view;
    TriangleModel model;
    Point start;
    boolean dragging, altering;
    Rectangle lineLens;            // used for line selection
    public TriangleControl(TriangleView tv)
        view = tv;
        model = view.getModel();
        dragging = altering = false;
        lineLens = new Rectangle(0, 0, 6, 6);
    public void mousePressed(MouseEvent e)
        Point p = e.getPoint();
        lineLens.setLocation(p.x - 3, p.y - 3);
        // are we over a line
        if(model.isLineSelected(lineLens))
            start = p;
            altering = true;
        // or are we within the triangle
        else if(model.contains(p))
            start = p;
            dragging = true;
    public void mouseReleased(MouseEvent e)
        altering = false;
        dragging = false;
        view.getCentroidLabel().setText("centroid location: " +
                                         model.findCentroid());
        view.repaint();  // for the construction lines
    public void mouseDragged(MouseEvent e)
        Point p = e.getPoint();
        if(altering)
            int x = p.x - start.x;
            int y = p.y - start.y;
            model.moveSide(x, y, p);
            updateTable();
            view.repaint();
            start = p;
        else if(dragging)
            int x = p.x - start.x;
            int y = p.y - start.y;
            model.translate(x, y);
            view.repaint();
            start = p;
    private void updateTable()
        String[] lengths = model.getLengths();
        String[] squares = model.getSquares();
        String[] angles  = model.getAngles();
        JTable table = view.getTable();
        for(int j = 0; j < angles.length; j++)
            table.setValueAt(lengths[j], 1, j + 1);
            table.setValueAt(squares[j], 2, j + 1);
            table.setValueAt(angles[j],  3, j + 1);
        view.getCentroidLabel().setText("centroid location: " +
                                         model.findCentroid());
* TriangleModel.java
* Created on 06 February 2005, 01:18
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
* @author  Rahindra Naidoo
public class TriangleModel                      //  (x1, y1)
{                                         //      |\
    static final int SIDES = 3;         //      | \
    private int cx, cy;                  //      |  \
    Polygon triangle;                     //      |_ _\ (x3, y3)
    int selectedIndex;                   //  (x2, y2)
    NumberFormat nf;
    Line2D[] medians;
    Point2D centroid;
    public TriangleModel(int x1, int y1, int x2, int y2, int x3, int y3)
        int[] x = new int[] { x1, x2, x3 };
        int[] y = new int[] { y1, y2, y3 };
        triangle = new Polygon(x, y, SIDES);
        nf = NumberFormat.getNumberInstance();
        nf.setMaximumFractionDigits(1);
    public boolean contains(Point p)
        // Polygon.contains doesn't work well enough
        return (new Area(triangle)).contains(p);
    public boolean isLineSelected(Rectangle r)
        Line2D line = new Line2D.Double();
        for(int j = 0; j < SIDES; j++)
            int[] x = triangle.xpoints;
            int[] y = triangle.ypoints;
            int x1 = x[j];
            int y1 = y[j];
            int x2 = x[(j + 1) % SIDES];
            int y2 = y[(j + 1) % SIDES];
            line.setLine(x1, y1, x2, y2);
            if(line.intersects(r))
                selectedIndex = j;
                return true;
        selectedIndex = -1;
        return false;
     * Only works for right triangle with right angle at (x2, y2)
    public void moveSide(int dx, int dy, Point p)
        int[] x = triangle.xpoints;
        int[] y = triangle.ypoints;
        switch(selectedIndex)
            case 0:
                x[0] += dx;
                x[1] += dx;
                break;
            case 1:
                y[1] += dy;
                y[2] += dy;
                break;
            case 2:
                double rise  = y[2] - y[0];
                double run   = x[2] - x[0];
                double slope = rise/run;
                // rise / run == (y[2] - p.y) / (x[2] - p.x)
                x[2] = p.x + (int)((y[2] - p.y) / slope);
                // rise / run == (p.y - y[0]) / (p.x - x[0])
                y[0] = p.y - (int)((p.x - x[0]) * slope);
    public void translate(int dx, int dy)
        triangle.translate(dx, dy);
    public Polygon getTriangle()
        return triangle;
    public String findCentroid()
        int[] x = triangle.xpoints;
        int[] y = triangle.ypoints;
        // construct the medians defined as the line from
        // any vertex to the midpoint of the opposite line
        medians = new Line2D[x.length];
        for(int j = 0; j < x.length; j++)
            int next = (j + 1) % x.length;
            int last = (j + 2) % x.length;
            Point2D vertex = new Point2D.Double(x[j], y[j]);
            // get midpoint of line opposite vertex
            double dx = ((double)x[last] - x[next])/2;
            double dy = ((double)y[last] - y[next])/2;
            Point2D oppLineCenter = new Point2D.Double(x[next] + dx,
                                                       y[next] + dy);
            medians[j] = new Line2D.Double(vertex, oppLineCenter);
        // centroid is located on any median 2/3 the way from the
        // vertex (P1) to the midpoint (P2) on the opposite side
        double[] lengths = getSideLengths();
        double dx = (medians[0].getX2() - medians[0].getX1())*2/3;
        double dy = (medians[0].getY2() - medians[0].getY1())*2/3;
        double px = medians[0].getX1() + dx;
        double py = medians[0].getY1() + dy;
        //System.out.println("px = " + nf.format(px) +
        //                 "\tpy = " + nf.format(py));
        centroid = new Point2D.Double(px, py);
        return "(" + nf.format(px) + ",  " + nf.format(py) + ")";
    public String[] getAngles()
        double[] lengths = getSideLengths();
        String[] vertices = new String[lengths.length];
        for(int j = 0; j < lengths.length; j++)
            int opp  = (j + 1) % lengths.length;
            int last = (j + 2) % lengths.length;
            double top = lengths[j] * lengths[j] +
                         lengths[last] * lengths[last] -
                         lengths[opp] * lengths[opp];
            double divisor = 2 * lengths[j] * lengths[last];
            double vertex = Math.acos(top / divisor);
            vertices[j] = nf.format(Math.toDegrees(vertex));
        return vertices;
    public String[] getLengths()
        double[] lengths = getSideLengths();
        String[] lengthStrs = new String[lengths.length];
        for(int j = 0; j < lengthStrs.length; j++)
            lengthStrs[j] = nf.format(lengths[j]);
        return lengthStrs;
    public String[] getSquares()
        double[] lengths = getSideLengths();
        String[] squareStrs = new String[lengths.length];
        for(int j = 0; j < squareStrs.length; j++)
            squareStrs[j] = nf.format(lengths[j] * lengths[j]);
        return squareStrs;
    private double[] getSideLengths()
        int[] x = triangle.xpoints;
        int[] y = triangle.ypoints;
        double[] lengths = new double[SIDES];
        for(int j = 0; j < SIDES; j++)
            int next = (j + 1) % SIDES;
            lengths[j] = Point.distance(x[j], y[j], x[next], y[next]);
        return lengths;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
* TriangleView.java
* Created on 06 February 2005, 01:21
public class TriangleView extends JPanel
    private TriangleModel model;
    private Polygon triangle;
    private JTable table;
    private JLabel centroidLabel;
    private boolean showConstruction;
    TriangleControl control;
    public TriangleView(TriangleModel model)
        this.model = model;
        triangle = model.getTriangle();
        showConstruction = false;
        control = new TriangleControl(this);
        addMouseListener(control);
        addMouseMotionListener(control);
    public void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.draw(triangle);
        if(model.medians == null)
            centroidLabel.setText("centroid location: " + model.findCentroid());
        // draw medians and centroid point
        if(showConstruction && !control.dragging)
            g2.setPaint(Color.red);
            for(int j = 0; j < 3; j++)
                g2.draw(model.medians[j]);
            g2.setPaint(Color.blue);
            g2.fill(new Ellipse2D.Double(model.centroid.getX() - 2,
                                         model.centroid.getY() - 2, 4, 4));
    public TriangleModel getModel()
        return model;
    public JTable getTable()
        return table;
    public JLabel getCentroidLabel()
        return centroidLabel;
    public JPanel getUIPanel()
        JCheckBox showCon = new JCheckBox("show construction");
        showCon.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent e)
                boolean state = ((JCheckBox)e.getSource()).isSelected();
                showConstruction = state;
                repaint();
        JPanel panel = new JPanel();
        panel.add(showCon);
        return panel;
    public JPanel getTablePanel()
        String[] headers = new String[] { "", "", "", "" };
        // row and column data labels
        String[] rowHeaders = {
            "sides", "lengths", "squares", "angles", "degrees"
        String[] sidesRow = { "vertical", "horizontal", "hypotenuse" };
        String[] anglesRow = { "hyp to ver", "ver to hor", "hor to hyp" };
        // collect data from model
        String[] angles  = model.getAngles();
        String[] lengths = model.getLengths();
        String[] squares = model.getSquares();
        String[][] allData = { sidesRow, lengths, squares, anglesRow, angles };
        int rows = 5;
        int cols = 4;
        Object[][] data = new Object[rows][cols];
        for(int row = 0; row < rows; row++)
            data[row][0] = rowHeaders[row];
            for(int col = 1; col < cols; col++)
                data[row][col] = allData[row][col - 1];
        table = new JTable(data, headers)
            public boolean isCellEditable(int row, int col)
                return false;
        DefaultTableCellRenderer renderer =
            (DefaultTableCellRenderer)table.getDefaultRenderer(String.class);
        renderer.setHorizontalAlignment(JLabel.CENTER);
        centroidLabel = new JLabel("centroid location:  ", JLabel.CENTER);
        Dimension d = centroidLabel.getPreferredSize();
        d.height = table.getRowHeight();
        centroidLabel.setPreferredSize(d);
        JPanel panel = new JPanel(new BorderLayout());
        panel.setBorder(BorderFactory.createTitledBorder("triangle data"));
        panel.add(table);
        panel.add(centroidLabel, "South");
        return panel;
}PLEASE HELP ---- Also does any one know how to draw a Triangle on a screen which can be controlled by a JSlider such that as and whenits incremented the triangle increase and vice versa... I need to prove Similarity in triangles using A Jslider that controls one triangle while the other triangle is Still on screen

Answer 1

Sharan,
The code given was part of the assignment and you are supposed to make the changes for your part right?
Please give details of what you have done so far and not expect us to do your assignment for you. We'll be glad to help answer questions and point to the right direction, but giving us the entire assignment and saying, very nicely I might add, "Please do it for me." Just seems to make a mockery of the hours, days, and years that many of us has spent earning our degrees and learning our skills.
Work on it and ask specific questions with examples of what you have done and you'll get a much better response.