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

/**
 * Class Boat - type a current's speed and direction, 
 * and the boat's speed and direction to control a boat
 * See http://collections.ic.gc.ca/allaboutmaps/aaMaps_M4_bearing_Z.htm
 * 
 * @author Chris Thiel
 * @version 1.1
 */
public class SwimSim extends JApplet implements ActionListener
{
    // instance variables - replace the example below with your own
    
    JTextField wSpeed;
    JTextField wDirection;
    JTextField speed;
    JTextField direction;
    JButton resetButton;
    JButton startButton;
    JLabel wsLabel,wdLabel,sLabel, dLabel;
    Container c;
    JPanel p;
    DrawingSurface ds;
    Timer timer;
    Image boat;
     /**
     * Called by the browser or applet viewer to inform this JApplet that it
     * has been loaded into the system. It is always called before the first 
     * time that the start method is called.
     */
    public void init()
    {
        // this is a workaround for a security conflict with some browsers
        // including some versions of Netscape & Internet Explorer which do 
        // not allow access to the AWT system event queue which JApplets do 
        // on startup to check access. May not be necessary with your browser. 
        JRootPane rootPane = this.getRootPane();    
        rootPane.putClientProperty("defeatSystemEventQueueCheck", Boolean.TRUE);
    
        // provide any initialisation necessary for your JApplet
        boat = getImage(getCodeBase(), "Swimmer.gif");
        ds = new DrawingSurface(boat);
        wsLabel= new JLabel("Speed of Current:",JLabel.RIGHT);
        wdLabel= new JLabel("Compass Direction:",JLabel.RIGHT);
        sLabel= new JLabel("Knots:",JLabel.RIGHT);
        dLabel= new JLabel("Direction:",JLabel.RIGHT);
        wSpeed  = new JTextField("2",8);
        wDirection = new JTextField("90",8);
        speed  = new JTextField("5", 8);
        direction = new JTextField("0", 8);
        ds.setXPos(150);
        ds.setYPos(150);


        /**
         * Here I'll make an Annonymous Inner Class for the
         * ActionListener of the scrollButton which
         * converts the scrollButton into a "start" or "stop" button,
         * and switches the timer on and off
         */
        timer = new Timer(60, this);
        resetButton = new JButton("Reset");
        resetButton.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent ev) {
                        if (timer.isRunning()){
                            timer.stop();
                            startButton.setText("Start");
                        } 
                        wSpeed.setText("2");
                        wDirection.setText("90");
                        speed.setText("5");
                        direction.setText("0");
                        direction.selectAll();
                        ds.setXPos(150);
                        ds.setYPos(150);
                        
                        ds.repaint();
                        
                    }
                });
        startButton = new JButton("Start");
        startButton.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent ev) {
                        if (timer.isRunning()){
                            timer.stop();
                            startButton.setText("Start");
                        }else{
                            try{
                            double wp =Double.parseDouble(wSpeed.getText());
                            double wd =Double.parseDouble(wDirection.getText());
                            double sp =Double.parseDouble(speed.getText());
                            double dr =Double.parseDouble(direction.getText());
                        
                            ds.setWaterSpeed(wp);
                            ds.setWaterDirection(wd);
                            ds.setSpeed(sp);
                            ds.setDirection(dr);
                        }catch (NumberFormatException e){
                               
                        }
                            direction.selectAll();
                            timer.start();
                            startButton.setText("Stop");
                        }
                    }
                });
        
        
        c = getContentPane();
        c.setLayout(new FlowLayout());
        p = new JPanel();
        p.setLayout( new GridLayout(2,6));
        p.add(wsLabel);
        p.add(wSpeed);
        p.add(sLabel);
        p.add(speed);
        p.add(startButton);
        p.add(wdLabel);
        p.add(wDirection);
          
        // p.add(Box.createHorizontalGlue());
        p.add(dLabel);
        p.add(direction);
        p.add(resetButton);
        c.add(p);
        c.add(ds);   
    }

    
    /**
     * Called by the browser or applet viewer to inform this JApplet that it
     * is being reclaimed and that it should destroy any resources that it
     * has allocated. The stop method will always be called before destroy. 
     */
   


   
   
    public void actionPerformed(ActionEvent ev) {
        Object source = ev.getSource();
        if(source == timer) {
            ds.sailAway();
            repaint();
        }
    }
}