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Java AWT Draw on Translucent Frame

I am having trouble drawing on a translucent frame. When the "alphaValue" is 255 everything works as expected. But I need a translucent frame. I created a small test class below that demonstrates the problem. As you can see the "MIDDLE" rectangle appears all the time. But the "DRAW" rectangle only appears when "alphaValue" is 255. When it is <=254 you can see via print lines that the method is still called, but the image does not appear to refresh. Thank you in advance for any help.
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Panel;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class TransparencyTest {
private static Point startPoint = new Point();
private static Point endPoint = new Point();
public static void main(String[] args) {
new TransparencyTest().test();
}
#SuppressWarnings("serial")
private void test() {
int alphaValue = 255;
Frame myFrame = new Frame();
myFrame.setUndecorated(true);
myFrame.setBackground(new Color(0, 0, 0, alphaValue));
myFrame.setSize(800, 800);
Panel myPanel = new Panel() {
public void paint(Graphics g) {
super.paint(g);
System.out.println("PAINT");
g.setColor(new Color(255, 0, 0, 255));
if(startPoint.equals(new Point())) {
System.out.println("MIDDLE");
g.drawRect(200, 200, 400, 400);
}
else {
System.out.println("DRAW");
g.drawRect(
(int)Math.min(startPoint.getX(), endPoint.getX()),
(int)Math.min(startPoint.getY(), endPoint.getY()),
(int)Math.abs(startPoint.getX() - endPoint.getX()),
(int)Math.abs(startPoint.getY() - endPoint.getY())
);
}
}
};
myFrame.add(myPanel);
MouseAdapter myMouseAdapter = new MouseAdapter() {
public void mousePressed(MouseEvent e) {
startPoint = e.getPoint();
}
public void mouseDragged(MouseEvent e) {
endPoint = e.getPoint();
myPanel.repaint();
}
};
myPanel.addMouseListener(myMouseAdapter);
myPanel.addMouseMotionListener(myMouseAdapter);
myFrame.setVisible(true);
}
}

AWT components don't have a concept of transparency in of themselves, they are always opaque.
You have use a JPanel, which you use setOpaque to control the opacity (on or off) with. This will allow the panel to become see through and you should then be able to see the alpha affect applied directly to the frame...
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TransparencyTest {
private static Point startPoint = new Point();
private static Point endPoint = new Point();
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
new TransparencyTest().test();
}
});
}
#SuppressWarnings("serial")
private void test() {
int alphaValue = 128;
JFrame myFrame = new JFrame();
myFrame.setUndecorated(true);
myFrame.setBackground(new Color(0, 0, 0, alphaValue));
// myFrame.setOpacity(0.1f);
myFrame.setSize(800, 800);
myFrame.setLocation(100, 100);
JPanel myPanel = new JPanel() {
public void paintComponent(Graphics g) {
super.paintComponent(g);
System.out.println("PAINT");
g.setColor(new Color(255, 0, 0, 255));
if (startPoint.equals(new Point())) {
System.out.println("MIDDLE");
g.drawRect(200, 200, 400, 400);
} else {
System.out.println("DRAW");
g.drawRect(
(int) Math.min(startPoint.getX(), endPoint.getX()),
(int) Math.min(startPoint.getY(), endPoint.getY()),
(int) Math.abs(startPoint.getX() - endPoint.getX()),
(int) Math.abs(startPoint.getY() - endPoint.getY())
);
}
}
};
myPanel.setOpaque(false);
myFrame.add(myPanel);
MouseAdapter myMouseAdapter = new MouseAdapter() {
public void mousePressed(MouseEvent e) {
startPoint = e.getPoint();
}
public void mouseDragged(MouseEvent e) {
endPoint = e.getPoint();
myPanel.repaint();
}
};
myPanel.addMouseListener(myMouseAdapter);
myPanel.addMouseMotionListener(myMouseAdapter);
myFrame.setVisible(true);
}
}

JLabel not showing up no matter what I do

I have tried a ton of different things to try to get the JLabel to show but I don't understand why it is not working. I have tried resizing it, though that is not what i want to do, I have tried other classes, but I would prefer to stick with this one, and it is starting to get really frustrating. If you have any ideas please help. But please try to keep them simple and explain very clearly as I am still quite new to java. I have only been going for about three or four months. Here is my code:
package com.thefallenpaladin;
import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
/**
* Created by darkp_000 on 11/4/2015.
*/
#SuppressWarnings("serial")
public class Game extends JPanel implements KeyListener,MouseListener {
public boolean mainMenu = true;
public int winWidth = 700; //Window Stats
public int winHeight = 600;
public int buttonOneX = 60; // Button Stats
public int buttonOneY = 240;
public int buttonOneW = 100;
public int buttonOneH = 75;
public boolean buttonOne = false;
public int mouseX; // not set because it is set in mouseClicked
public int mouseY;
public static void main(String[] args) {
Game game = new Game();
JFrame window = new JFrame("I hate this");
JLabel onePlayer = new JLabel();
onePlayer.setLocation(0,0/*game.buttonOneX + game.buttonOneX/2,game.buttonOneY + game.buttonOneY/2*/);
window.add(game);
window.setFocusable(true);
window.setResizable(false);
window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
window.setSize(700,600); //TODO
window.setVisible(true);
game.requestFocusInWindow();
game.add(onePlayer);
game.addKeyListener(game);
game.addMouseListener(game);
window.setLocationRelativeTo(null);
while(true) { // Main Game loop
onePlayer.setText("One Player");
game.repaint();
game.customUpdate();
}
}
public void customUpdate() {
if(mouseX > buttonOneX && mouseX < buttonOneX+buttonOneX && mouseY > buttonOneY && mouseY < buttonOneY+buttonOneY && mainMenu) {
buttonOne = true;
System.out.print("Starting Game");
}
}
public void paint(Graphics g) {
if(mainMenu) {
g.setColor(Color.CYAN); // Set main menu
g.fillRect(0,0,winWidth,winHeight);
g.setColor(Color.GREEN);
g.fillRect(buttonOneX,buttonOneY,buttonOneW,buttonOneH);
}
if(buttonOne) {
mainMenu = false;
g.setColor(Color.GREEN);
g.fillRect(0,0,winWidth,winHeight);
}
}
public void keyTyped(KeyEvent e) {
}
public void keyPressed(KeyEvent e) {
System.out.println(e);
}
public void keyReleased(KeyEvent e) {
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
// System.out.println(e);
mouseX = e.getX();
mouseY = e.getY();
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
}

Okay so you've made a couple of basic mistakes...
First, JLabel onePlayer = new JLabel(); creates an empty label, with no size (0x0) and since labels are transparent by default, you'd not see it
Next, you've overridden paint of a top level container (JFrame), but failed to honor the paint chain effectively preventing any of the child components from ever getting painted
public void paint(Graphics g) {
if (mainMenu) {
g.setColor(Color.CYAN); // Set main menu
g.fillRect(0, 0, winWidth, winHeight);
g.setColor(Color.GREEN);
g.fillRect(buttonOneX, buttonOneY, buttonOneW, buttonOneH);
}
if (buttonOne) {
mainMenu = false;
g.setColor(Color.GREEN);
g.fillRect(0, 0, winWidth, winHeight);
}
}
So, if I remove your paint method and change JLabel onePlayer = new JLabel(); to JLabel onePlayer = new JLabel("I'm a label"); I get this output...
Also...
while (true) { // Main Game loop
onePlayer.setText("One Player");
game.repaint();
game.customUpdate();
}
has the potential to try screw up your program, you have no guarantee's in what thread your main method is been called and you should not make assumptions.
Start by creating a custom component, extending from something like JPanel and override it's paintComponent method, place your custom painting there. In fact, you should have a panel for each state of your game (menu, running, settings, etc).
Add these to your frame (probably using a CardLayout to enable you to easily switch between them)
Use either a Thread or Swing Timer as a main game loop, one which you create explicitly.
Have a look at Painting in AWT and Swing, Performing Custom Painting, How to Use CardLayout and How to use Swing Timers for some more details
As a "conceptual" example...
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class AwesomeGame {
public static void main(String[] args) {
new AwesomeGame();
}
public AwesomeGame() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new ContentPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public interface NavigationController {
public void letsPlay();
}
public class ContentPane extends JPanel implements NavigationController {
private CardLayout cardLayout;
private GamePane gamePane;
public ContentPane() {
cardLayout = new CardLayout();
setLayout(cardLayout);
add(new MenuPane(this), "TheMenu");
add((gamePane = new GamePane()), "TheGame");
cardLayout.show(this, "TheMenu");
}
#Override
public void letsPlay() {
cardLayout.show(this, "TheGame");
gamePane.play();
}
}
public class MenuPane extends JPanel {
public MenuPane(NavigationController navigationController) {
JLabel label = new JLabel("My Super Dupa Awesome Game!");
label.setFont(label.getFont().deriveFont(Font.BOLD, 48));
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(label, gbc);
JButton play = new JButton("Play Now!");
play.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
navigationController.letsPlay();
}
});
add(play, gbc);
setBackground(Color.GREEN);
}
}
public class GamePane extends JPanel {
public GamePane() {
setBackground(Color.BLUE);
}
public void play() {
Timer timer = new Timer(500, new ActionListener() {
int count;
#Override
public void actionPerformed(ActionEvent e) {
count++;
if (count % 2 == 0) {
setForeground(Color.BLACK);
} else {
setForeground(Color.RED);
}
repaint();
}
});
timer.start();
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
String text = "I bet you're blowen away by it's awesomness!";
FontMetrics fm = g2d.getFontMetrics();
int x = (getWidth() - fm.stringWidth(text)) / 2;
int y = ((getHeight() - fm.getHeight()) / 2) + fm.getAscent();
g2d.drawString(text, x, y);
g2d.dispose();
}
}
}

window crash in java game development

This is my code which would create a window that would takeover my full screen and would have a background colour of blue and would print "Hello World" in black, but when I run this application my screen freezes and the text "Hello World" comes out and after 5 seconds the thread terminates, but background colour does not changes and the screen becomes like this!
Can anyone point out what am I doing wrong?
This is my Screen class:
import java.awt.DisplayMode;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Window;
import javax.swing.JFrame;
public class Screen {
private GraphicsDevice graphic_card;
public Screen() {
GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
graphic_card = environment.getDefaultScreenDevice();
}
public void set_full_screen(DisplayMode mode, JFrame window) {
window.setUndecorated(true);
window.setResizable(false);
graphic_card.setFullScreenWindow(window);
if ((mode != null) && (graphic_card.isDisplayChangeSupported())) {
try {
graphic_card.setDisplayMode(mode);
} catch (Exception exception) {
// No handling of exception
}
}
}
public Window getFullScreenWindow() {
return graphic_card.getFullScreenWindow();
}
public void restore_screen() {
Window window = graphic_card.getFullScreenWindow();
if (window != null) {
window.dispose();
}
graphic_card.setFullScreenWindow(null);
}
}
And this my Mayank class:
import java.awt.Color;
import java.awt.DisplayMode;
import java.awt.Font;
import java.awt.Graphics;
import javax.swing.JFrame;
public class Mayank extends JFrame {
public static void main(String[] args) {
DisplayMode display_mode = new DisplayMode(800, 600, 16, DisplayMode.REFRESH_RATE_UNKNOWN);
Mayank mayank = new Mayank();
mayank.run(display_mode);
}
public void run(DisplayMode display_mode) {
setBackground(Color.BLUE);
setForeground(Color.BLACK);
setFont(new Font("Arial", Font.PLAIN, 24));
Screen game_screen = new Screen();
try {
game_screen.set_full_screen(display_mode, this);
try {
Thread.sleep(5000);
} catch (Exception exception) {
// No handling of exception
}
} finally {
game_screen.restore_screen();
}
}
public void paint(Graphics g) {
g.drawString("Hello World!!", 200, 200);
}
}

I don't know where you got this code, but it is so wrong.
I created a GUI that displays a blue background for 5 seconds, then changes the background to white.
Here's the GUI.
All Swing applications must start with a call to the SwingUtilities invokeLater method to put the creation and execution of Swing components on the Event Dispatch thread (EDT).
Always draw on a JPanel. Never draw directly on a JFrame.
Your timer blocked the EDT. You must put timing and update events in a separate thread. When you change the GUI from a separate thread, you must execute the invokeLater method to ensure the update of the drawing panel is done on the EDT.
Here's the code.
package com.ggl.testing;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Manyak implements Runnable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Manyak());
}
#Override
public void run() {
JFrame frame = new JFrame("Hello Word Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DrawingPanel drawingPanel = new DrawingPanel();
frame.add(drawingPanel);
frame.pack();
frame.setVisible(true);
new Thread(new Delay(drawingPanel)).start();
}
public class DrawingPanel extends JPanel {
private static final long serialVersionUID = -685508126882892538L;
private Color color;
public DrawingPanel() {
this.setPreferredSize(new Dimension(400, 400));
this.color = Color.BLUE;
}
public void setColor(Color color) {
this.color = color;
this.repaint();
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(color);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.BLACK);
g.setFont(new Font("Arial", Font.PLAIN, 24));
g.drawString("Hello World!", 120, 200);
}
}
public class Delay implements Runnable {
private DrawingPanel drawingPanel;
public Delay(DrawingPanel drawingPanel) {
super();
this.drawingPanel = drawingPanel;
}
#Override
public void run() {
try {
Thread.sleep(5000L);
} catch (InterruptedException e) {
}
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
drawingPanel.setColor(Color.WHITE);
}
});
}
}
}

Window Resize event

I have a program that scales an image to the size of the screen. I currently have a component listener listening for a componentResized event, but this is not what I want. I would like the method to only be called one the user lift's there finger off their mouse, not as they are doing the resizing. This way, my image will not constantly be resizing to the user's specifications.
Thanks!

A solution is to supply a Swing Timer which is reset each time componentResized is called. This injects a small delay between the last resize event and the time you should perform the resize action.
import javax.swing.Timer;
//...
// Declare an instance variable...
private Timer resizeTimer;
//...
// Probably in you classes constructor
resizeTimer = new Timer(250, new ActionListener() {
public void actionPerformed(ActionEvent evt) {
// Actually perform the resizing of the image...
resizeBackgroundImage();
}
});
// Don't want a repeating event...
resizeTimer.setRepeats(false);
//...
public void componentResized(ComponentEvent evt) {
resizeTimre.restart();
}
This basically, sets it up so that it will require 250 milliseconds between resize events before an attempt is made to resize the image. You can play around with the value to suit your own needs.
Updated with runnable example
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class RescaleTest {
public static void main(String[] args) {
new RescaleTest();
}
public RescaleTest() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage master;
private Image scaled;
private Timer resizeTimer;
public TestPane() {
try {
master = ImageIO.read(new File("/path/to/your/image"));
scaled = master;
} catch (IOException exp) {
exp.printStackTrace();
}
resizeTimer = new Timer(250, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
resizeBackground();
}
});
resizeTimer.setRepeats(false);
addComponentListener(new ComponentAdapter() {
#Override
public void componentResized(ComponentEvent e) {
resizeTimer.restart();
}
});
}
protected void resizeBackground() {
// This is not my preferred scaling process, I prefer to use
// a divide and conqure approach and do so in the background
// where possible, but this is beyond the scope of the question...
if (getWidth() < getHeight()) {
scaled = master.getScaledInstance(getWidth(), -1, Image.SCALE_SMOOTH);
} else {
scaled = master.getScaledInstance(-1, getHeight(), Image.SCALE_SMOOTH);
}
repaint();
}
#Override
public Dimension getPreferredSize() {
return master != null ? new Dimension(master.getWidth(), master.getHeight()) : new Dimension(200, 200);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (scaled != null) {
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - scaled.getWidth(this)) / 2;
int y = (getHeight() - scaled.getHeight(this)) / 2;
g2d.drawImage(scaled, x, y, this);
g2d.dispose();
}
}
}
}
nb: The scaling used in this example is not my preferred method and was done for demonstration purposes only. See The Perils of Image.getScaledInstance() for details and Scale the ImageIcon automatically to label size for an alterantive approach...

If you put Toolkit.getDefaultToolkit().setDynamicLayout(false); right inside of main it will disable the frame from updating dynamically as you increase/decrease it's size. The ui will only be updated after you stop resizing.
import MainMenu.GameManager;
import java.awt.*;
import java.io.IOException;
public class Main {
Main(){
}
public static void main(String[] args) throws IOException {
GameManager manager = new GameManager();
Toolkit.getDefaultToolkit().setDynamicLayout(false);
}
}

Why won't my JFrame program change background color?

This is a program that goes full screen for five seconds then go back to normal. What i am trying to do is change the back ground color to yellow. I tried getContentPane().setBackground(Color.YELLOW) but it still does not work.
package gamedev;
import java.awt.Color;
import java.awt.DisplayMode;
import java.awt.Font;
import java.awt.Graphics;
import java.io.PrintWriter;
import javax.swing.JFrame;
public class GameDev extends JFrame {
public static void main(String[] arg) {
DisplayMode dm = new DisplayMode(800, 600, 16, DisplayMode.REFRESH_RATE_UNKNOWN);
GameDev b = new GameDev();
b.getContentPane().setBackground(Color.yellow);
b.run(dm);
}
public void run(DisplayMode dm) {
setBackground(Color.YELLOW);
setForeground(Color.red);
setFont(new Font("Arial", Font.PLAIN, 25));
Screen s = new Screen();
try {
s.setFullScreen(dm, this);
try {
Thread.sleep(5000);
} catch (Exception ex) {
}
} finally {
s.restoreScreen();
}
}
public void paint(Graphics g) {
g.drawString("You know you love me home boy.", 200, 200);
}
}
and second class
package gamedev;
import java.awt.DisplayMode;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Window;
import javax.swing.JFrame;
public class Screen {
GraphicsDevice videoCard;
public Screen() {
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
videoCard = env.getDefaultScreenDevice(); // acces computer screen
}
public void setFullScreen(DisplayMode dm, JFrame window) {
window.setUndecorated(true);
window.setResizable(false);
videoCard.setFullScreenWindow(window);
if (dm != null && videoCard.isDisplayChangeSupported()) {
try {
videoCard.setDisplayMode(dm);
} catch (Exception ex) {
}
}
}
public Window getFullScreenWindow() {
return videoCard.getFullScreenWindow(); //returns ur window
}
public void restoreScreen() {
Window w = videoCard.getFullScreenWindow();
if (w != null) {
w.dispose();
}
videoCard.setFullScreenWindow(null); // takes away from full screen.
}
}

Basically, you are blocking the Event Dispatching Thread, preventing from processing any new incoming events, including paint requests. Instead, you should use something like a javax.swing.Timer to wait in the background until the required time has elapsed, then restore the screen.
The javax.swing.Timer will provide notification after the specified delay within the context of the Event Dispatching Thread, making it safe to use when you need to make modifications to the UI.
Take a closer look at Concurrency in Swing for more details...
import java.awt.Color;
import java.awt.DisplayMode;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.Timer;
public class GameDev extends JFrame {
public static void main(String[] arg) {
DisplayMode dm = new DisplayMode(800, 600, 16, DisplayMode.REFRESH_RATE_UNKNOWN);
GameDev b = new GameDev();
b.getContentPane().setBackground(Color.yellow);
b.run(dm);
}
public void run(DisplayMode dm) {
setBackground(Color.YELLOW);
setForeground(Color.red);
setFont(new Font("Arial", Font.PLAIN, 25));
final Screen s = new Screen();
s.setFullScreen(dm, this);
Timer timer = new Timer(5000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
s.restoreScreen();
}
});
timer.setRepeats(false);
timer.start();
}
public void paint(Graphics g) {
super.paint(g);
g.drawString("You know you love me home boy.", 200, 200);
}
public class Screen {
GraphicsDevice videoCard;
public Screen() {
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
videoCard = env.getDefaultScreenDevice(); // acces computer screen
}
public void setFullScreen(DisplayMode dm, JFrame window) {
window.setUndecorated(true);
window.setResizable(false);
videoCard.setFullScreenWindow(window);
if (dm != null && videoCard.isDisplayChangeSupported()) {
try {
videoCard.setDisplayMode(dm);
} catch (Exception ex) {
}
}
}
public Window getFullScreenWindow() {
return videoCard.getFullScreenWindow(); //returns ur window
}
public void restoreScreen() {
Window w = videoCard.getFullScreenWindow();
if (w != null) {
w.dispose();
}
videoCard.setFullScreenWindow(null); // takes away from full screen.
}
}
}
You should also take a look at Performing Custom Painting, as your paint method may be preventing it from actually painting the background