[sadam@serv16 ~/Fall05]$ cat P3/Poly.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class Poly extends JFrame
{
    int polyCount = 0;
    int firstpoint = 0;
    int lastx, lasty;
    Color selectedColor;
    String[] comboList = {"Red","Blue","Green","Black","Yellow"};
    JComboBox combo = new JComboBox(comboList);
    JMenuItem menuRed;
    JMenuItem menuBlue;
    JMenuItem menuGreen;
    JMenuItem menuBlack;
    JMenuItem menuYellow;
    MyPolygon[] polygons = new MyPolygon[5];
    JPanel centerPanel = new DrawPanel();
    int transx, transy;

    Poly()
    {
        addWindowListener(new WindowAdapter()
            {public void windowClosing(WindowEvent e){System.exit(0);}});


        MH mh = new MH();
        CH ch = new CH();

        JPanel southPanel = new JPanel();
        southPanel.setLayout(new BorderLayout());
        centerPanel.setLayout(new BorderLayout());

        JMenuBar menuBar = new JMenuBar();

        JMenu menu = new JMenu("Color");

        JMenuItem menuRed = new JMenuItem("Red");
        menuRed.addActionListener(mh);
        JMenuItem menuBlue = new JMenuItem("Blue");
        menuBlue.addActionListener(mh);
        JMenuItem menuGreen = new JMenuItem("Green");
        menuGreen.addActionListener(mh);
        JMenuItem menuBlack = new JMenuItem("Black");
        menuBlack.addActionListener(mh);
        JMenuItem menuYellow = new JMenuItem("Yellow");
        menuYellow.addActionListener(mh);
        JMenuItem exit = new JMenuItem("Exit");
        exit.addActionListener(mh);

        menu.add(menuRed);
        menu.add(menuBlue);
        menu.add(menuGreen);
        menu.add(menuBlack);
        menu.add(menuYellow);
        menu.addSeparator();
        menu.add(exit);

        menuBar.add(menu);
        setJMenuBar(menuBar);

        southPanel.add(combo);
        combo.add(ch);
        getContentPane().add(southPanel, "South");

        centerPanel.setBackground(Color.white);
        getContentPane().add(centerPanel, "Center");

    }

    class MyPolygon extends Polygon
    {
        boolean isComplete = false;
        Color color;

        MyPolygon(Color c)
        {
            color = c;
        }
    }

    class DrawPanel extends JPanel
    {
        DrawPanel()
        {
            addMouseListener(new Down());
            addMouseMotionListener(new Drag());
        }
    }

    class Drag extends MouseMotionAdapter
    {
        public void mouseDragged(MouseEvent e)
        {
            int x = e.getX(), y = e.getY();
            if(e.isShiftDown())
                {
                    for(int count = 4; count >= 0; count--)
                        {
                            if(polygons[count] != null)
                                {
                                    if(polygons[count].contains(x,y))
                                        {
                                            polygons[count].translate(transx-x,transy-y);
                                        }
                                    break;
                                }
                        }
                }
        }
    }

    class Down extends MouseAdapter
    {
        public void mousePressed(MouseEvent e)
        {
            Graphics g = centerPanel.getGraphics();
            int x = e.getX(), y = e.getY();
            transx = x; transy = y;
            if(firstpoint == 0)
                polygons[polyCount] = new MyPolygon(selectedColor);
            polygons[polyCount].addPoint(x,y);

            if(firstpoint == 0)
                firstpoint = 1;
            else
                g.drawLine(lastx, lasty, x, y);

            lastx = x; lasty = y;

            if(e.getClickCount() == 2)
                {
                    firstpoint = 0;
                    g.setColor(polygons[polyCount].color);
                    g.fillPolygon(polygons[polyCount]);
                }
        }
    }

    class CH implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            Object source = e.getSource();
            JComboItem selection = (JComboItem)source;
            String cmd = selection.getText();
            if(cmd.equals("Red"))
                {
                    selectedColor = Color.red;
                    combo.setSelectedIndex(0);
                }
            else if(cmd.equals("Blue"))
                {
                    if(firstpoint == 0)
                        g.setColor(Color.blue);
                    combo.setSelectedIndex(1);
                }
            else if(cmd.equals("Green"))
                {
                    if(firstpoint == 0)
                        g.setColor(Color.green);
                    combo.setSelectedIndex(2);
                }
            else if(cmd.equals("Black"))
                {
                    if(firstpoint == 0)
                        g.setColor(Color.black);
                    combo.setSelectedIndex(3);
                }
            else if(cmd.equals("Yellow"))
                {
                    if(firstpoint == 0)
                        g.setColor(Color.yellow);
                    combo.setSelectedIndex(4);
                }
        }
    }

    class MH implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            Graphics g = centerPanel.getGraphics();
            Object source = e.getSource();
            JMenuItem selection = (JMenuItem)source;
            String cmd = selection.getText();
            if(cmd.equals("Red"))
                {
                    selectedColor = Color.red;
                    combo.setSelectedIndex(0);
                }
            else if(cmd.equals("Blue"))
                {
                    if(firstpoint == 0)
                        g.setColor(Color.blue);
                    combo.setSelectedIndex(1);
                }
            else if(cmd.equals("Green"))
                {
                    if(firstpoint == 0)
                        g.setColor(Color.green);
                    combo.setSelectedIndex(2);
                }
            else if(cmd.equals("Black"))
                {
                    if(firstpoint == 0)
                        g.setColor(Color.black);
                    combo.setSelectedIndex(3);
                }
            else if(cmd.equals("Yellow"))
                {
                    if(firstpoint == 0)
                        g.setColor(Color.yellow);
                    combo.setSelectedIndex(4);
                }
            else
                System.exit(0);
            for(int count = 4; count >= 0; count--)
                {
                    if(polygons[count] != null)
                        {
                            if(polygons[count].isComplete)
                                {
                                    g.setColor(polygons[count].color);
                                    g.fillPolygon(polygons[count]);
                                }
                        }
                }
        }
    }

    public static void main(String [] args)
    {
        JFrame poly = new Poly();
        poly.setTitle("Polygons!");
        poly.setSize(500,400);
        poly.setVisible(true);
    }
}