Session: Scheduling. just a treat: a small sprite game

Game-2/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

Game-2/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Game-2</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

Game-2/src/Game/Board.java

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+package Game;
+
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Toolkit;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.KeyAdapter;
+import java.awt.event.KeyEvent;
+import java.util.List;
+
+import javax.swing.Timer;
+import javax.swing.JPanel;
+
+
+public class Board extends JPanel implements ActionListener {
+
+    private final int ICRAFT_X = 40;
+    private final int ICRAFT_Y = 60;
+    private final int DELAY = 10;
+    private Timer timer;
+    private SpaceShip spaceShip;
+
+    public Board() {
+
+        initBoard();
+    }
+
+    private void initBoard() {
+
+        addKeyListener(new TAdapter());
+        setBackground(Color.BLACK);
+        setFocusable(true);
+
+        spaceShip = new SpaceShip(ICRAFT_X, ICRAFT_Y);
+
+        timer = new Timer(DELAY, this);
+        timer.start();
+    }
+
+    @Override
+    public void paintComponent(Graphics g) {
+        super.paintComponent(g);
+
+        doDrawing(g);
+
+        Toolkit.getDefaultToolkit().sync();
+    }
+
+    private void doDrawing(Graphics g) {
+
+        Graphics2D g2d = (Graphics2D) g;
+        
+        g2d.drawImage(spaceShip.getImage(), spaceShip.getX(),
+                spaceShip.getY(), this);
+
+        List<Missile> missiles = spaceShip.getMissiles();
+
+        for (Missile missile : missiles) {
+            
+            g2d.drawImage(missile.getImage(), missile.getX(),
+                    missile.getY(), this);
+        }
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+
+        updateMissiles();
+        updateSpaceShip();
+
+        repaint();
+    }
+
+    private void updateMissiles() {
+
+        List<Missile> missiles = spaceShip.getMissiles();
+
+        for (int i = 0; i < missiles.size(); i++) {
+
+            Missile missile = missiles.get(i);
+
+            if (missile.isVisible()) {
+
+                missile.move();
+            } else {
+
+                missiles.remove(i);
+            }
+        }
+    }
+
+    private void updateSpaceShip() {
+
+        spaceShip.move();
+    }
+
+    private class TAdapter extends KeyAdapter {
+
+        @Override
+        public void keyReleased(KeyEvent e) {
+            spaceShip.keyReleased(e);
+        }
+
+        @Override
+        public void keyPressed(KeyEvent e) {
+            spaceShip.keyPressed(e);
+        }
+    }
+}
+

Game-2/src/Game/Missile.java

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+package Game;
+
+public class Missile extends Sprite {
+
+    private final int BOARD_WIDTH = 390;
+    private final int MISSILE_SPEED = 2;
+
+    public Missile(int x, int y) {
+        super(x, y);
+        
+        initMissile();
+    }
+    
+    private void initMissile() {
+        
+        loadImage("src/resources/missile.png");  
+        getImageDimensions();
+    }
+
+    public void move() {
+        
+        x += MISSILE_SPEED;
+        
+        if (x > BOARD_WIDTH) {
+            visible = false;
+        }
+    }
+}

Game-2/src/Game/SpaceShip.java

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+package Game;
+
+import java.awt.event.KeyEvent;
+import java.util.ArrayList;
+import java.util.List;
+
+public class SpaceShip extends Sprite {
+
+    private int dx;
+    private int dy;
+    private List<Missile> missiles;
+
+    public SpaceShip(int x, int y) {
+        super(x, y);
+        
+        initSpaceShip();
+    }
+
+    private void initSpaceShip() {
+
+        missiles = new ArrayList<>();
+        
+        loadImage("src/resources/spaceship.png"); 
+        getImageDimensions();
+    }
+
+    public void move() {
+        x += dx;
+        y += dy;
+    }
+
+    public List<Missile> getMissiles() {
+        return missiles;
+    }
+
+    public void keyPressed(KeyEvent e) {
+
+        int key = e.getKeyCode();
+
+        if (key == KeyEvent.VK_SPACE) {
+            fire();
+        }
+
+        if (key == KeyEvent.VK_LEFT) {
+            dx = -1;
+        }
+
+        if (key == KeyEvent.VK_RIGHT) {
+            dx = 1;
+        }
+
+        if (key == KeyEvent.VK_UP) {
+            dy = -1;
+        }
+
+        if (key == KeyEvent.VK_DOWN) {
+            dy = 1;
+        }
+    }
+
+    public void fire() {
+        missiles.add(new Missile(x + width, y + height / 2));
+    }
+
+    public void keyReleased(KeyEvent e) {
+
+        int key = e.getKeyCode();
+
+        if (key == KeyEvent.VK_LEFT) {
+            dx = 0;
+        }
+
+        if (key == KeyEvent.VK_RIGHT) {
+            dx = 0;
+        }
+
+        if (key == KeyEvent.VK_UP) {
+            dy = 0;
+        }
+
+        if (key == KeyEvent.VK_DOWN) {
+            dy = 0;
+        }
+    }
+}

Game-2/src/Game/Sprite.java

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+package Game;
+
+import java.awt.Image;
+import javax.swing.ImageIcon;
+
+public class Sprite {
+
+    protected int x;
+    protected int y;
+    protected int width;
+    protected int height;
+    protected boolean visible;
+    protected Image image;
+
+    public Sprite(int x, int y) {
+
+        this.x = x;
+        this.y = y;
+        visible = true;
+    }
+
+    protected void loadImage(String imageName) {
+
+        ImageIcon ii = new ImageIcon(imageName);
+        image = ii.getImage();
+    }
+    
+    protected void getImageDimensions() {
+
+        width = image.getWidth(null);
+        height = image.getHeight(null);
+    }    
+
+    public Image getImage() {
+        return image;
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public int getY() {
+        return y;
+    }
+
+    public boolean isVisible() {
+        return visible;
+    }
+
+    public void setVisible(Boolean visible) {
+        this.visible = visible;
+    }
+}
+

Game-2/src/Game/TheGame.java

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+package Game;
+
+import java.awt.EventQueue;
+import javax.swing.JFrame;
+
+public class TheGame extends JFrame {
+
+    public TheGame() {
+        
+        initUI();
+    }
+    
+    private void initUI() {
+
+        add(new Board());
+
+        setTitle("Moving sprite");
+        setSize(800, 800);
+        
+        setLocationRelativeTo(null);
+        setResizable(false);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    }
+
+    public static void main(String[] args) {
+
+        EventQueue.invokeLater(() -> {
+        	TheGame ex = new TheGame();
+            ex.setVisible(true);
+        });
+    }
+
+}