Develop Reference

setUndecorated() code is not working correctly

The program works fine, but when I add the setUndecorated code, the panel does not appear. Problem is solving when I minimize and reopen the program. I tried repaint() , but It's not working.
package testing;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class test extends JFrame{
static int width = 900;
static int height = 520;
JFrame frame;
JPanel panel;
JButton selectKey = new JButton("Select KeyIMG");
static BufferedImage bg;
class MyCanvas extends JComponent{
public void paint(Graphics g) {
try {
bg = ImageIO.read(new File("BGFILE"));
} catch (IOException e) {
e.printStackTrace();
}
g.setClip(0, 0, width, height);
g.drawImage(bg,0,0,width,height, this);
g.dispose();panel.repaint();
}
}
public test(){
super("Test");
setBounds(250, 100, width, height);
selectKey.setBounds(width/9,height/2,width/45*8,height/13);
getContentPane().add(new MyCanvas());setUndecorated(true);setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel = new JPanel();
panel.setBackground( new Color(0, 0, 0, 0));
panel.setLayout(null);
panel.add(selectKey);
add(panel);
}
public static void main(String...Args){
new test();
}
}
What's wrong ?

Issues
Overriding paint. It's highly discouraged to override paint, painting is a complex series of compounding methods which work together to produce a the final result. It's highly recommended that you override paintComponent instead
Not calling super.paint, see the previous comment. Unless you know exactly what you're doing and are prepared to take over the responsibility of the paint method, call it's super method, there only a very few use cases I'd consider it safe not to do this.
Using a alpha based color on an opaque component; panel.setBackground(new Color(0, 0, 0, 0));. This is bad idea. Swing only knows how to deal with opaque and transparent components, it doesn't know how it should paint components with alpha based colors. The API will simply ignore any components beneath it, which is likely one of the major causes of your problem
g.dispose(); don't ever dispose of a Graphics context you did not create or copy. Doing so can prevent other components from been painted
Don't call panel.repaint(); from within any paint method, painting paints the current state, it should never do anything to change it, doing so well put you into a spiral of CPU death as it begins to chew up all the CPU cycles, in fact, MyCanvas has no right to be modifying panel anyway and the way your code is set up, it could generate a NullPointerException
"Other" concerns
static BufferedImage bg; is worrisome. No body else has any need to deal with this variable, the only class which should be dealing with it is the MyCanvas class
g.setClip(0, 0, width, height); is pointless (and potentially dangerous), this has already been done before the paint method was called. This is made worse by the fact that you are not relying on the components actual size, which could cause the painting to overrun the visible bounds of the component
Extending from JFrame. You should avoid extending from top level containers, they are complex components to which you rarely add any new/reusable functionality to and they lock you into a single use case, much better to start with a JPanel and add that to whatever container you need
An example...
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Test {
class Background extends JComponent {
private BufferedImage bg;
public Background() {
try {
bg = ImageIO.read(new File("/path/to/your/image"));
} catch (IOException e) {
e.printStackTrace();
}
setLayout(new BorderLayout());
}
#Override
public Dimension getPreferredSize() {
return bg == null ? super.getPreferredSize() : new Dimension(bg.getWidth(), bg.getHeight());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (bg != null) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.drawImage(bg, 0, 0, getWidth(), getHeight(), this);
g2d.dispose();
}
}
}
public Test() {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.setContentPane(new Background());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
panel.add(new JLabel("This is a label, don't I look pretty"), gbc);
JButton selectKey = new JButton("Select KeyIMG");
panel.add(selectKey, gbc);
panel.setOpaque(false);
frame.add(panel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static void main(String... Args) {
new Test();
}
}

java - Put JComponent in front of graphics in NullLayoutManager?

I have a JButton in a JPanel that has graphics, but the button won't show as it is in the layer BELOW the graphics.
I've already read this : Put JLabel in front of Graphics 2D Rectangle in JPanel
But the answers tell me not to use the NullLayoutManager.
Is there any way to do it with the NullLayoutManager, because I need to specifically position my JButton in my JPanel?
If this is not possible, are there any other ways I can position a JComponent at a position x, y? I've also googled that and NullLayoutManager is what the world wide web gives me.
Code:
JPanel p = new JPanel(){
#Override
public void paintComponent(Graphics gr){
Graphics2D g = (Graphics2D) gr;
g.setColor(Color.BLACK);
g.fillRect(0, 0, 800, 800);
g.setFont(titlefont);
g.setColor(Color.WHITE);
g.drawString("dont steal my game idea plz", 25, 100);
g.drawImage(bi, 138, 70, null);
repaint();
}
};
p.setLayout(null);
JButton b = new JButton("PLAY");
b.setLocation(100, 200);
b.setFont(ufont);
f.add(p);
p.add(b);

Is there any way to do it with the NullLayoutManager, because I need to specifically position my JButton in my JPanel?
The answer is "yes", but do you understand what the layout managers actually do? How they work and the role they fill in order to replace them and take over the requirements of their functionality?
null layouts are just a bad idea, there are so many things that can wrong with them it's mind numbing just trying to think about it. If none of the stock layout managers do what you want, maybe consider using MigLayout or some other layout manager, possibly even writing your own, at least this way, you will still be able to work within the API, which has been designed to work around layout managers.
There are a couple of other issues, first, you're painting your image AFTER the paint the text, this could cause some issues if the two overlap. Second, you're breaking the paint chain by not calling super.paintComponent, this could result in some unexpected and unwanted results. Third, you don't need to fill the component, use setBackground and let the super.paintComponent deal with it.
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class DownWithNullLayouts {
public static void main(String[] args) {
new DownWithNullLayouts();
}
public DownWithNullLayouts() {
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 TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private Font titlefont;
private BufferedImage bi;
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(30, 0, 0, 0);
add(new JButton("Play"), gbc);
try {
bi = ImageIO.read(...);
} catch (IOException ex) {
ex.printStackTrace();
}
titlefont = UIManager.getFont("Label.font");
setBackground(Color.BLACK);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - bi.getWidth()) / 2;
int y = (getHeight()- bi.getHeight()) / 2;
g2d.drawImage(bi, x, y, this);
g2d.setFont(titlefont);
g2d.setColor(Color.WHITE);
g2d.drawString("dont steal my game idea plz", 25, 100);
g2d.dispose();
}
}
}
Take a closer look at Painting in AWT and Swing and Performing Custom Painting for more details

java custom shaped frame using image [duplicate]

This question already has answers here:
Image/Graphic into a Shape
(3 answers)
Closed 8 years ago.
i like to create a java jframe look like this image.i have already crated jframes with different shapes like triangles ,circles ,polygons and some crazy shapes .but the problem it's too hard[99% impossible ] to create shape like this image.so how can i make a jframe like this.i used this code for create shaped window..
setUndecorated(true);
Polygon polygon = new Polygon();
polygon.addPoint(0, 0);
polygon.addPoint(100,100);
GeneralPath path = new GeneralPath();
path.append(polygon, true);
setShape(path);
now can i convert this image to a shape .then set setshapes.any idea?
or is there anyway to make jframe's fully transperent and jlable which hold image completely visible?

To make a transparent window, you need to set the frames background color's alpha to 0. This is probably the most counter intuitive call I've seen in a while, as if you do this to any other Swing component, you will completely screw up the paint process.
You don't want to change the opacity of the window, as it effectives the entire window and it's contents equally.
For example...
JWindow frame = new JWindow();
frame.setBackground(new Color(0, 0, 0, 0));
You don't have to use a JWindow, but this means I don't need to undecorate it myself...
You also need to make sure that whatever content you add to the window is transparent (opaque = false), so that it doesn't "hide" what's underneath it...
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JWindow;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;
public class LeafWindow {
public static void main(String[] args) {
new LeafWindow();
}
public LeafWindow() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JWindow frame = new JWindow();
frame.setBackground(new Color(0, 0, 0, 0));
frame.setContentPane(new LeafPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setAlwaysOnTop(true);
}
});
}
public class LeafPane extends JPanel {
private BufferedImage leaf;
public LeafPane() {
setBorder(new CompoundBorder(
new LineBorder(Color.RED),
new EmptyBorder(0, 0, 250, 0)));
try {
leaf = ImageIO.read(getClass().getResource("/Leaf.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
setOpaque(false);
setLayout(new GridBagLayout());
JButton button = new JButton("Close");
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
add(button);
}
#Override
public Dimension getPreferredSize() {
return leaf == null ? new Dimension(200, 200) : new Dimension(leaf.getWidth(), leaf.getHeight());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (leaf != null) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.drawImage(leaf, 0, 0, this);
g2d.dispose();
}
}
}
}
This example deliberate adds a line border to the content as you can see what the original window bounds would be. It also uses a EmptyBorder to force the JButton onto the graphics, but this is just an example...

You'll have to create a shape based on your image. There are different threads here on SO that provide some way how to do this. The best one (based on the description, I didn't try it myself) might be Java - Create a shape from border around image. Another option for more complex images could be Image/Graphic into a Shape.
Another solution might be to use an undecorated frame along with "per-pixel transparency", as explained by Oracle here: http://docs.oracle.com/javase/tutorial/uiswing/misc/trans_shaped_windows.html

Layering text over JLabel

This is how I want my app to look like.
Trouble is, if I drag the JLabel with the "Hello, I'm Myra" over another JLabel (whose icon is the speech bubble), rather than superimposing or layering, NetBeans shifts the JLabels to be adjacent.
How do I superimpose ie. place the text JLabel on top of another JLabel?
Do note, I'm using NetBeans. It doesn't allow me to edit much of the JFrame or JLabel code.

Netbeans won't let you add components to a JLabel, it doesn't see them as a valid Container.
This won't be easily achieved using component labels, as the icon placement is outside of your control. A better solution might be to use a custom component, such as a JPanel and manually draw the speech bubble image yourself, then using a combination of Border and LayoutManager it would allow you to add other components to it
This is a very basic example...
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class SpeechBubble {
public static void main(String[] args) {
new SpeechBubble();
}
public SpeechBubble() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
SpeechBubblePane bubble = new SpeechBubblePane();
JLabel hello = new JLabel("Hello, I'm Myra");
hello.setFont(hello.getFont().deriveFont(28f));
hello.setForeground(Color.CYAN);
JLabel message = new JLabel("<html>What would you like to know today?</html>");
message.setFont(message.getFont().deriveFont(22f));
message.setForeground(Color.WHITE);
bubble.setLayout(new GridLayout(2, 1));
bubble.add(hello);
bubble.add(message);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setBackground(Color.BLACK);
frame.add(bubble);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class SpeechBubblePane extends JPanel {
private BufferedImage background;
public SpeechBubblePane() {
setOpaque(false);
try {
background = ImageIO.read(getClass().getResource("/speechbubble.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
setBorder(new EmptyBorder(19, 19, 66, 19));
}
#Override
public Dimension getPreferredSize() {
Dimension size = new Dimension(200, 200);
if (background != null) {
size = new Dimension(background.getWidth(), background.getHeight());
}
return size;
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (background != null) {
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - background.getWidth()) / 2;
int y = (getHeight()- background.getHeight()) / 2;
g2d.drawImage(background, x, y, this);
g2d.dispose();
}
}
}
}
If I was doing this, I would consider developing up a "9-path" which would allow you to break the image down into 9 parts and scale the outer sections based on what the content requires, for example...

It sounds like you just want to add a z-order. If so, you need a LayeredPane:
http://docs.oracle.com/javase/7/docs/api/index.html
http://docs.oracle.com/javase/7/docs/api/javax/swing/JLayeredPane.html

JAVA Showing Image -GUI

I'm trying to make a simple GUI using JAVA
no image is shown
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.swing.*;
import javax.imageio.*;
public class EmiloLadderSnack {
public JFrame frame=new JFrame("EmiloLadderSnack");
public Image img;
public Graphics g;
public EmiloLadderSnack()
{
frame.setBounds(0, 0, Toolkit.getDefaultToolkit().getScreenSize().width, Toolkit.getDefaultToolkit().getScreenSize().height);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
try
{
img= ImageIO.read(new File("/media/01CCE00FA6888D80/Achieve/Eclipse/EmiloLadderSnack/src/photo.jpg"));
g.drawImage(img, 50, 50, null);
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
public static void main(String args[])
{
new EmiloLadderSnack();
}
}
please help me to show an image in my simple GUI using JAVA
I'm using Eclipse

Hovercraft Full Of Eels is right, as he/she usually is. It really did not look like you tried.
Look at the tutorials, but I do believe when Hovercraft Full Of Eels says the correct way, hover means as follows.
Let me explain what I did below. First I created a new class that extended the JFrame. The JFrame is what is suppose to hold all of the components in a window. Then draw on the JPanel so that all of your drawings are contained in a lightweight container. I set the layout with a new layout I just discovered due to StackOverflow which I am very thankful for. The layout is called the MigLayout and it is a third party resource. You have to download it and import it. Please note that you do not have to have the MigLayout, but it is preferable to use due to its ease of use. After I set the Layout Constraint to fill and docked the JPanel in the center I created a new class which extended the JPanel so that I could change the paint method. The #Override lets you, in a way, re create the method for that extended class. As you can see once draw to that one graphics class then you are all set. There is a lot more you should read up on. Read the comments below your post, they suggest fairly good material.
Anything I get wrong Hovercraft will say below in the comments. So look for that as well.
Hovers corrections:
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class GraphicExample extends JPanel {
private static final String IMG_FILE_PATH = "/media/01CCE00FA6888D80/" +
"Achieve/Eclipse/EmiloLadderSnack/src/photo.jpg";
private BufferedImage img;
public GraphicExample(BufferedImage img) {
this.img = img;
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null) {
g.drawImage(img, 0, 0, this);
}
}
#Override
public Dimension getPreferredSize() {
if (img != null) {
return new Dimension(img.getWidth(), img.getHeight());
}
return super.getPreferredSize();
}
private static void createAndShowGui() {
try {
BufferedImage img = ImageIO.read(new File(IMG_FILE_PATH));
JFrame frame = new JFrame("GraphicExample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new GraphicExample(img));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
// the easy way to display an image -- in a JLabel:
ImageIcon icon = new ImageIcon(img);
JLabel label = new JLabel(icon);
JOptionPane.showMessageDialog(frame, label);
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
My initial recommendations:
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
import net.miginfocom.swing.MigLayout;
public class DrawCircle extends JFrame {
JPanel panel;
public DrawCircle(String title, int width, int height) {
this.setTitle(title);
this.setSize(width, height);
this.setLocationRelativeTo(null); // Center JFrame
this.setLayout(new MigLayout("fill")); // Download external jar
this.panel = new DrawOval();
this.add(panel, "dock center"); // Link: http://www.miglayout.com/
this.setVisible(true);
}
public class DrawOval extends JPanel {
Color color = new Color(1, 1, 1);
public DrawOval() {
}
#Override
public void paint(Graphics g) {
g.setColor(color.RED);
g.fillOval(0, 0, this.getWidth(), this.getHeight());
}
}
}

I can't imagine that this is compiling. There must be a NullPointerException.
When you want to draw something you usually subclass JPanel and do the drawing in the paintComponent() method, like this:
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(img, 50, 50, null);
}