Issue with graphics2d

[Dimitar Dimitrov]

Hello there, I have the following issue: I have 2 images drawn in a JPanel ... I use Graphics2D for a rotation and translation for each images... I'd assigned different buttons for different images to operate with them... for example I have up/down/left/right for the one and w/s/a/d for the other... when I start the jframe and use the keys for moving... they move well but when I move the one the other one stays still... and opposite.. how to prevent that.. I know I need some kind of threading but I'm newbie with that... Thanks in advance

[pete stein]

Without code, how can anyone guess what is being done wrong? Consider creating and posting an SSCCE (please click on and read the link).

[Maneesh Godbole]

And welcome to the Ranch
In case you haven't already do so, please check out these tips on getting the most of the Ranch.

[Dimitar Dimitrov]

 public class GamePanel extends JPanel implements KeyListener {

	private static final long serialVersionUID = 1L;

	private Tank tank1;
	private Tank tank2;

	private Point tank1Position = new Point(0, 0);
	private Point tank2Position = new Point(0, 0);

	private Point tank1RotationPoint = new Point(0, 0);
	private Point tank2RotationPoint = new Point(0, 0);

	private double tank1Angle = 0;
	private double tank2Angle = 180;

	public GamePanel(final Image first, final Image second) {
		super();

		new Thread() {
			public void run() {
				tank1 = new Tank(first, 100);
			}
		}.start();

		new Thread() {
			public void run() {
				tank2 = new Tank(second, 100);
			}
		}.start();
		// tank1 = new Tank(second, 100);
		// tank2 = new Tank(second, 100);

		setFocusable(true);
		addKeyListener(this);
	}

	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		Graphics2D g2d = (Graphics2D) g;

		// get the default transform
		AffineTransform origTransform = g2d.getTransform();

	//if no positions of tanks - assign the default...	
if (new Point(0, 0).equals(tank1Position) && tank1Position.equals(tank2Position) && tank2Position.equals(tank2RotationPoint)) {
			tank1Position = new Point(getWidth() / 2 - tank1.getCenter().x, getHeight() - tank1.getCenter().y * 2);
			tank2Position = new Point(getWidth() / 2 - tank2.getCenter().x, 0);
			tank2RotationPoint = new Point(tank2Position.x + tank2.getCenter().x, tank2Position.y + tank2.getCenter().y);
		}

		tank1.paintTank(g2d, tank1Position, tank1RotationPoint, tank1Angle);
		tank2.paintTank(g2d, tank2Position, tank2RotationPoint, tank2Angle);

		g2d.setTransform(origTransform);

		g2d.dispose();
	}

	public void keyPressed(KeyEvent e) {
		if (e.getKeyCode() == KeyEvent.VK_UP) {
			tank1Position.y -= 1;
			repaint();
		}
		if (e.getKeyCode() == KeyEvent.VK_DOWN) {
			tank1Position.y += 1;
			repaint();
		}
		if (e.getKeyCode() == KeyEvent.VK_LEFT) {
			tank1RotationPoint.x = tank1Position.x + tank1.getCenter().x;
			tank1RotationPoint.y = tank1Position.y + tank1.getCenter().y;
			tank1Angle -= 1;
			repaint();
		}
		if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
			tank1RotationPoint.x = tank1Position.x + tank1.getCenter().x;
			tank1RotationPoint.y = tank1Position.y + tank1.getCenter().y;
			tank1Angle += 1;
			repaint();
		}
		if (e.getKeyCode() == KeyEvent.VK_CONTROL && e.getKeyLocation() == KeyEvent.KEY_LOCATION_RIGHT) {
			System.out.println("RIGHT CTRL");
		}

		if (e.getKeyCode() == KeyEvent.VK_W) {
			tank2Position.y -= 1;
			repaint();
		}
		if (e.getKeyCode() == KeyEvent.VK_S) {
			tank2Position.y += 1;
			repaint();
		}
		if (e.getKeyCode() == KeyEvent.VK_A) {
			tank2RotationPoint.x = tank2Position.x + tank1.getCenter().x;
			tank2RotationPoint.y = tank2Position.y + tank1.getCenter().y;
			tank2Angle += 1;
			repaint();
		}
		if (e.getKeyCode() == KeyEvent.VK_D) {
			tank2RotationPoint.x = tank2Position.x + tank1.getCenter().x;
			tank2RotationPoint.y = tank2Position.y + tank1.getCenter().y;
			tank2Angle -= 1;
			repaint();
		}
		if (e.getKeyCode() == KeyEvent.VK_CONTROL && e.getKeyLocation() == KeyEvent.KEY_LOCATION_LEFT) {
			System.out.println("LEFT CTRL");
		}
	}   

and this is the paintTank() method:

  public void paintTank(Graphics2D g, Point p, Point rot, double angle) {
		AffineTransform tankTransform = new AffineTransform();
		g.setTransform(tankTransform);
		g.rotate(Math.toRadians(angle), rot.x, rot.y);
		g.translate(p.x, p.y);
		g.drawImage(tankImage, tankTransform, null);
	}  

it is not the completed text.. I need to make changes.. so if you have any idea about the issue.. I'll be glad to hear it... thanks

[Michael Dunn]

what does a tank have to do with the problem?

read the link provided.