/*press arrow key to move, press space key to shoot*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
/******* game graphics ********/
public class VehicleTrackerGraphDemo {
public static void main(String[] args) {
JFrame mainFrame = new JFrame("GUI");
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setBounds(10, 10, 400, 400);
mainFrame.setLayout(new BorderLayout());
final JPanel paintPanel = new GameBoard();
mainFrame.add(paintPanel, BorderLayout.CENTER);
mainFrame.setVisible(true);
}
}
class GameBoard extends JPanel implements KeyListener {
private final int HEIGHT = 300;
private final int WIDTH = 400;
private final int TANKWIDTH = 30;
private final int TANKHEIGHT = 10;
private final int MOVESPEED = 2;
private final int TARGETX = 100;
private final int TARGETY = 200;
private int dx = WIDTH / 2;
private int dy = HEIGHT;
private boolean enmeyAlive = true;
private Rectangle2D yourtank = new Rectangle2D.Double(dx, dy, TANKWIDTH,
TANKHEIGHT);
private Rectangle2D laserBeam = new Rectangle2D.Double(-10, -10, 0,
0);
public GameBoard() {
this.addKeyListener(this);
this.setBackground(Color.white);
this.setFocusable(true);
}
@Override
protected void paintComponent(Graphics grphcs) {
cleanDead();
super.paintComponent(grphcs);
Graphics2D gr = (Graphics2D) grphcs;
gr.draw(yourtank);
gr.draw(laserBeam);
if (enmeyAlive)
drawTank(grphcs, TARGETX, TARGETY);
}
private void cleanDead() {
if (overlaps(TARGETX, TARGETY, TANKWIDTH, TANKHEIGHT, laserBeam)) {
enmeyAlive = false;
}
}
private boolean overlaps(int x, int y, int width, int height, Rectangle2D r) {
return x < r.getX() + r.getWidth() && x + width > r.getX()
&& y < r.getY() + r.getHeight() && y + height > r.getY();
}
private void drawTank(Graphics g, int x, int y) {
g.setColor(Color.yellow);
g.draw3DRect(x, y, TANKWIDTH, TANKHEIGHT, true);
}
@Override
public void keyTyped(KeyEvent e) {
System.out.println(e.getKeyCode());
shoot();
repaint();
}
@Override
public void keyPressed(KeyEvent e) {
moveRec(e);
repaint();
}
@Override
public void keyReleased(KeyEvent e) {
laserBeam.setRect(-10, -10, 0, 0); //hide it
repaint();
}
public void shoot() {
laserBeam.setRect(dx + TANKWIDTH/2, 0, 2, dy);
}
public void moveRec(KeyEvent evt) {
switch (evt.getKeyCode()) {
case KeyEvent.VK_LEFT:
dx -= MOVESPEED;
yourtank.setRect(dx, dy, TANKWIDTH, TANKHEIGHT);
break;
case KeyEvent.VK_RIGHT:
dx += MOVESPEED;
yourtank.setRect(dx, dy, TANKWIDTH, TANKHEIGHT);
break;
case KeyEvent.VK_UP:
dy -= MOVESPEED;
yourtank.setRect(dx, dy, TANKWIDTH, TANKHEIGHT);
break;
case KeyEvent.VK_DOWN:
if (dy < HEIGHT)
dy += MOVESPEED;
yourtank.setRect(dx, dy, TANKWIDTH, TANKHEIGHT);
break;
}
}
}
