I created a 600 x 600 grid for a TicTacToe game, but every time I try to get the image(Using the getImg() method), it shows a white screen. The JPanel's background is darkGray, it neither draws the grid, nor does it show the JPanel background.
This is the code, I haven't tried anything
PanelManager.java
package TicTacToe.display.panel;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JPanel;
public class PanelManager extends JPanel implements Runnable{
Thread t;
BufferedImage grid;
public PanelManager() {
this.setPreferredSize(new Dimension(600,600));
this.setBackground(Color.darkGray);
this.setDoubleBuffered(true);
this.startThread();
}
public void getImg() {
try {
grid = ImageIO.read(getClass().getResourceAsStream("/TicTacToe/grid/grid.png"));
}
catch (IOException e) {
e.printStackTrace();
}
}
public void startThread() {
t = new Thread(this);
t.start();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.drawImage(grid,300,300,600,600,null);
g2.dispose();
}
public void update() {
}
public void run() {
while(t != null) {
update();
try {
Thread.sleep(10);
}
catch (Exception e) {}
repaint();
}
}
}
FrameManager.java
package TicTacToe.display;
import javax.swing.JFrame;
import javax.swing.WindowConstants;
import TicTacToe.display.panel.PanelManager;
public class FrameManager {
public static void main(String[] args) {
JFrame f = new JFrame();
PanelManager pm = new PanelManager();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.setTitle("TicTacToe Windowed Edition");
f.setResizable(false);
f.setVisible(true);
f.setSize(600,600);
f.setLocationRelativeTo(null);
f.add(pm);
}
}
After a bit of reading the code, I realized I didn't use the getImg(); method, all I had to do was add one line of code in the PanelManager() constructor as shown below :-
public PanelManager() {
this.setPreferredSize(new Dimension(600,600));
this.setBackground(Color.darkGray);
this.setDoubleBuffered(true);
this.getImg();
this.startThread();
}
Related
I used JFrame to import and display an image, and used mousemotionlistener to detect the mouse clicks, and I want to be able to draw on top of the image. I want to be able to, if the user makes a click, make that pixel a certain color while preserving the rest of the image, however, I couldn't find out how to use Graphics to do so without deleting the rest of the image or opening a new window.
public class Simple extends JFrame{
static ImageIcon icon;
static JFrame myframe;
static JLabel mylabel;
static BufferedImage image = null;
public static void main(String[] args) {
try{
image = ImageIO.read(new File("mypic.png"));
}
catch (IOException e) {
e.printStackTrace();
}
icon=new ImageIcon(image);
myframe=new JFrame();
myframe.setSize(200,200);
myframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mylabel=new JLabel();
mylabel.setIcon(icon);
myframe.getContentPane().add(mylabel);
myframe.pack();
Container container = myframe.getContentPane();
MouseMotionEvents3 mousemotion = new MouseMotionEvents3();
container.add(mousemotion);
myframe.setVisible(true);
while(1 == 1) {
if(mousemotion.signal == true) {
System.out.println("second message");
mousemotion.signal = false;
}
}
}
}
class MouseMotionEvents3 extends JPanel implements MouseListener,
MouseMotionListener {
public boolean signal;
public MouseMotionEvents3() {
addMouseListener(this);
addMouseMotionListener(this);
signal = false;
}
public void mouseClicked(MouseEvent me) {
// System.out.println("i hate you");
}
public void mouseEntered(MouseEvent me) {
}
public void mouseExited(MouseEvent me) {
}
public void mousePressed(MouseEvent me) {
signal = true;
System.out.println("message");
}
public void mouseReleased(MouseEvent me) {
}
public void mouseDragged(MouseEvent me) {
}
public void mouseMoved(MouseEvent me) {
}
}
I would highly recommend that you start by having a read through Performing Custom Painting and the 2D Graphics Trail, they will provide you with a starting point.
There are a number of ways you might achieve this, this example simply keeps track of the click points and draws dots over the top of the image
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private List<Point> points;
private BufferedImage image;
public TestPane() {
points = new ArrayList<>(25);
try {
image = ImageIO.read(new File("/Users/shanewhitehead/Desktop/Screen Shot 2017-03-09 at 1.55.18 pm.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
points.add(e.getPoint());
repaint();
}
});
}
#Override
public Dimension getPreferredSize() {
return image == null ? new Dimension(200, 200) : new Dimension(image.getWidth(), image.getHeight());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
if (image != null) {
g2d.drawImage(image, 0, 0, this);
}
g2d.setColor(Color.RED);
for (Point p : points) {
g2d.fillOval(p.x - 4, p.y - 4, 8, 8);
}
g2d.dispose();
}
}
}
This example draws the dots directly to the image itself...
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
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.SwingUtilities;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage image;
public TestPane() {
try {
image = ImageIO.read(new File("/Users/shanewhitehead/Desktop/Screen Shot 2017-03-09 at 1.55.18 pm.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
if (image != null) {
Point p = e.getPoint();
Graphics2D g2d = image.createGraphics();
g2d.setColor(Color.RED);
g2d.fillOval(p.x - 4, p.y - 4, 8, 8);
g2d.dispose();
repaint();
}
}
});
}
#Override
public Dimension getPreferredSize() {
return image == null ? new Dimension(200, 200) : new Dimension(image.getWidth(), image.getHeight());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.drawImage(image, 0, 0, this);
g2d.dispose();
}
}
}
In both cases, they simply make use of the Graphics2D API
The simplest method would be to have a list of points that represent the pixels you wish to colour. Then override the paint method for the label to first call super.paint (to display the image) and then paint the pixels that have been clicked.
List<Point> points = new ArrayList<>();
myLabel = new JLabel() {
#Override
public void paint(Graphics g) {
super.paint(g);
points.forEach(p -> g.fillRect(p.x, p.y, 1, 1));
}
};
In your mouse handling just add the current point to the list and repaint the label.
public void mouseClicked(MouseEvent me) {
points.add(me.getPoint());
myLabel.repaint();
}
There are more sophisticated methods that involve buffered images but this is likely good enough to get you started.
I figured it out, I can use the getGraphics() method of the JFrame to allow myself to draw on top of the image.
edit: Andrew Thompson is right, minimizing the window removes the changes.
I used JFrame to import and display an image, and used mousemotionlistener to detect the mouse clicks, and I want to be able to draw on top of the image. I want to be able to, if the user makes a click, make that pixel a certain color while preserving the rest of the image, however, I couldn't find out how to use Graphics to do so without deleting the rest of the image or opening a new window.
public class Simple extends JFrame{
static ImageIcon icon;
static JFrame myframe;
static JLabel mylabel;
static BufferedImage image = null;
public static void main(String[] args) {
try{
image = ImageIO.read(new File("mypic.png"));
}
catch (IOException e) {
e.printStackTrace();
}
icon=new ImageIcon(image);
myframe=new JFrame();
myframe.setSize(200,200);
myframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mylabel=new JLabel();
mylabel.setIcon(icon);
myframe.getContentPane().add(mylabel);
myframe.pack();
Container container = myframe.getContentPane();
MouseMotionEvents3 mousemotion = new MouseMotionEvents3();
container.add(mousemotion);
myframe.setVisible(true);
while(1 == 1) {
if(mousemotion.signal == true) {
System.out.println("second message");
mousemotion.signal = false;
}
}
}
}
class MouseMotionEvents3 extends JPanel implements MouseListener,
MouseMotionListener {
public boolean signal;
public MouseMotionEvents3() {
addMouseListener(this);
addMouseMotionListener(this);
signal = false;
}
public void mouseClicked(MouseEvent me) {
// System.out.println("i hate you");
}
public void mouseEntered(MouseEvent me) {
}
public void mouseExited(MouseEvent me) {
}
public void mousePressed(MouseEvent me) {
signal = true;
System.out.println("message");
}
public void mouseReleased(MouseEvent me) {
}
public void mouseDragged(MouseEvent me) {
}
public void mouseMoved(MouseEvent me) {
}
}
I would highly recommend that you start by having a read through Performing Custom Painting and the 2D Graphics Trail, they will provide you with a starting point.
There are a number of ways you might achieve this, this example simply keeps track of the click points and draws dots over the top of the image
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private List<Point> points;
private BufferedImage image;
public TestPane() {
points = new ArrayList<>(25);
try {
image = ImageIO.read(new File("/Users/shanewhitehead/Desktop/Screen Shot 2017-03-09 at 1.55.18 pm.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
points.add(e.getPoint());
repaint();
}
});
}
#Override
public Dimension getPreferredSize() {
return image == null ? new Dimension(200, 200) : new Dimension(image.getWidth(), image.getHeight());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
if (image != null) {
g2d.drawImage(image, 0, 0, this);
}
g2d.setColor(Color.RED);
for (Point p : points) {
g2d.fillOval(p.x - 4, p.y - 4, 8, 8);
}
g2d.dispose();
}
}
}
This example draws the dots directly to the image itself...
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
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.SwingUtilities;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private BufferedImage image;
public TestPane() {
try {
image = ImageIO.read(new File("/Users/shanewhitehead/Desktop/Screen Shot 2017-03-09 at 1.55.18 pm.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
if (image != null) {
Point p = e.getPoint();
Graphics2D g2d = image.createGraphics();
g2d.setColor(Color.RED);
g2d.fillOval(p.x - 4, p.y - 4, 8, 8);
g2d.dispose();
repaint();
}
}
});
}
#Override
public Dimension getPreferredSize() {
return image == null ? new Dimension(200, 200) : new Dimension(image.getWidth(), image.getHeight());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.drawImage(image, 0, 0, this);
g2d.dispose();
}
}
}
In both cases, they simply make use of the Graphics2D API
The simplest method would be to have a list of points that represent the pixels you wish to colour. Then override the paint method for the label to first call super.paint (to display the image) and then paint the pixels that have been clicked.
List<Point> points = new ArrayList<>();
myLabel = new JLabel() {
#Override
public void paint(Graphics g) {
super.paint(g);
points.forEach(p -> g.fillRect(p.x, p.y, 1, 1));
}
};
In your mouse handling just add the current point to the list and repaint the label.
public void mouseClicked(MouseEvent me) {
points.add(me.getPoint());
myLabel.repaint();
}
There are more sophisticated methods that involve buffered images but this is likely good enough to get you started.
I figured it out, I can use the getGraphics() method of the JFrame to allow myself to draw on top of the image.
edit: Andrew Thompson is right, minimizing the window removes the changes.
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);
}
});
}
}
}
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);
}
}
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