import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; /** * Viewer/controller for ball world simulation. * This panel contains the view plus buttons and mouse input controllers * that allow the user to pause and stop the simulation, and add new * objects to the simulation. * CSE 331 12au, 13wi, 13au */ public class BallSimControl extends JPanel { // instance variables private BallGraphicsView viewPane; // the panel displaying the model private SimModel world; // the simulation world model private static Random random; // random number generator (used to // initialize new balls added to model) /** * Construct a viewer/controller for the given world * @param w the model object this object is controlling and viewing */ public BallSimControl(SimModel w) { // save reference to model this.world = w; // initialize random number sequence with system clock to get different // results each time. (For debugging, would be better to use the same seed // value each time.) random = new Random(System.currentTimeMillis()); // default layout manager for JPanel is flow layout - we want a border layout setLayout(new BorderLayout()); // create paneel with ball display and place it in the center viewPane = new BallGraphicsView(world); viewPane.setPreferredSize(new Dimension(world.getWidth(), world.getHeight())); add(viewPane, BorderLayout.CENTER); // register the view with the model world.addView(viewPane); // set up listener for mouse clicks on the view viewPane.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { world.add(randomBall(e.getX(), e.getY())); } }); // create panel with buttons and add it at the bottom JButton pause = new JButton("pause"); JButton resume = new JButton("resume"); JButton stop = new JButton("stop"); JPanel buttons = new JPanel(); buttons.add(pause); buttons.add(resume); buttons.add(stop); pause.setBackground(Color.yellow); resume.setBackground(Color.green); stop.setBackground(Color.red); buttons.setBackground(Color.lightGray); add(buttons, BorderLayout.SOUTH); // set up listener for the buttons SimButtonListener buttonListener = new SimButtonListener(); pause.addActionListener(buttonListener); resume.addActionListener(buttonListener); stop.addActionListener(buttonListener); } /** * Create a new ball with random color, size, and velocity * @param x initial x coordinate of the new ball * @param y initial y coordinate of the new ball */ private Ball randomBall(int x, int y) { return new Ball(x, y, random.nextInt(21) - 11, // dx random.nextInt(21) - 11, // dy new Color(random.nextInt(256), // color random.nextInt(256), random.nextInt(256)), random.nextInt(20) + 5, // diameter world); // model containing window size } /////////////// Inner Classes ///////////////// /** * Handle button clicks for the BallSimControl window. */ class SimButtonListener implements ActionListener { /** * Process button clicks by turning the simulation on and off * @param e the event created by the button click */ public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("pause")) { world.pause(); } else if (e.getActionCommand().equals("resume")) { world.resume(); } else if (e.getActionCommand().equals("stop")) { world.stop(); } } } }