I am making a small app, but i want to set an image as background at the whole window. I tried to make this like below but nothing happen. The image is in the folder where the class is so as a path I put only the name...Can you help me please? what can I do?
Container c = getContentPane();
setContentPane(c);
setContentPane(new JLabel(new ImageIcon("Chrysanthemum.jpg")));
One possibility is to add a BorderLayout to the JFrame, which should fill the JFrame with the JLabel, then set the background, adding the JLabel to the frame and then add components to it, like this:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Foo extends JFrame {
public Foo() {
setLayout(new BorderLayout());
JLabel background = new JLabel(new ImageIcon("Untitled.png"));
add(background);
background.setLayout(new FlowLayout());
background.add(new JButton("foo"));
setSize(500, 500);
setVisible(true);
}
public static void main(String[] args) {
Foo foo = new Foo();
}
}
The above works for me, with the JButton at the top center of the 500 by 500 JFrame with the specified background.
What I would do is create a JPanel with a background image, and add it to the JFrame. I already have a BackgroundPanel class right in one of my projects, and this is the setup I have for it.
public class MyFrame extends JFrame {
private BackgroundPanel bgPanel;
public MyFrame() {
bgPanel = new BackgroundPanel("Chrysanthemum.jpg");
setTitle("MyFrame");
setResizable(false);
setContentPane(bgPanel);
pack();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String[] args) {
new MyFrame();
}
}
// -- BackgroundPanel class
public class BackgroundPanel extends JPanel {
private static final long serialVersionUID = 1L;
private Image bg;
public BackgroundPanel(String path) {
this(Images.load(path).getImage());
}
public BackgroundPanel(Image img) {
this.bg = img;
setPreferredSize(new Dimension(bg.getWidth(null), bg.getHeight(null)));
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (bg != null) g.drawImage(bg, 0, 0, getWidth(), getHeight(), null);
}
}
Related
How can I specify the coordinates of the following panel, instead of having it aligned to the center.
I have tried a lot and used different layouts, but still couldn't get it to work. Please help me solving this problem. Thanks!
Here is my code..
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Lesson2 extends JFrame {
private static final long serialVersionUID = -198253288329146091L;
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Lesson2 frame = new Lesson2();
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Lesson2() {
contentPane = new JPanel();
setContentPane(contentPane);
JPanel panel = new JPanel() {
private static final long serialVersionUID = -5974584127539186578L;
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.GREEN);
g.fillRect(0, 0, 500, 500);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(500, 500);
}
};
contentPane.add(panel);
}
}
Here is an example of how it looks now
https://prnt.sc/moe3al
Here is the final code edited using a nulled layout with a set size
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Lesson1 extends JFrame {
private static final long serialVersionUID = -198253288329146091L;
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Lesson1 frame = new Lesson1();
frame.setSize(1000, 1000);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Lesson1() {
contentPane = new JPanel();
setContentPane(contentPane);
contentPane.setLayout(null);
JPanel panel = new JPanel() {
private static final long serialVersionUID = -5974584127539186578L;
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.GREEN);
g.fillRect(0, 0, 500, 500);
}
};
panel.setLayout(null);
panel.setSize(500, 500);
contentPane.add(panel);
}
}
All Swing/AWT containers use FlowLayout as the default layout manager, which results in the component being centered. If you want more control, you can use Absolute Positioning by calling contentPane.setLayout(null) and setting the component's coordinates via panel.setBounds(), but be aware that it may not handle window resize elegantly.
I want to add a JScrollPane to a JPanel. I have added some more code to this old question of mine.
I have a Panel class as follows:
import java.awt.*;
import javax.swing.JPanel;
public class Panel extends JPanel
{
public Panel()
{
super (true);
}
public void paintComponent (Graphics g)
{
super.paintComponent(g);
setBackground(Color.WHITE);
g.drawRect(250, 250, 10, 10);
}
}
and a JScrollPaneTest class as follows:
import javax.swing.*;
public class JScrollPaneTest extends JFrame
{
Panel panel = new Panel();
public JScrollPaneTest ()
{
super("Test JScrollPane");
add(new JScrollPane(panel, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS));
setSize(300,300);
setVisible(true);
}
public static void main (String[] args)
{
JScrollPaneTest test = new JScrollPaneTest();
test.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
}
I have drawn a small rectangle in the lower right corner on the Panel; apparently the JScrollPane does not work because when resizing the rectangle disappears.
Please let me know if you have any suggestions; thanks!
So, I am creating a new Canvas (JPanel) class: Canvas canvas = new Canvas(); and then I am calling a method on that class: canvas.addTextBox();
Now, from within this Canvas class, I want to add a new jTextArea to the Canvas. I tried using the code below but it isn't showing up. Not sure what I am doing wrong. Thanks!
class Canvas extends JPanel {
public Canvas() {
this.setOpaque(true);
//this.setBackground(Color.WHITE);
}
public void addTextBox() {
final JTextArea commentTextArea = new JTextArea(10, 10);
commentTextArea.setLineWrap(true);
commentTextArea.setLineWrap(true);
commentTextArea.setWrapStyleWord(true);
commentTextArea.setVisible(true);
}
}
Full Code
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class UMLEditor {
public static void main(String[] args) {
JFrame frame = new UMLWindow();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBounds(30, 30, 1000, 700);
frame.getContentPane().setBackground(Color.white);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class UMLWindow extends JFrame {
Canvas canvas = new Canvas();
private static final long serialVersionUID = 1L;
public UMLWindow() {
addMenus();
}
public void addMenus() {
getContentPane().add(canvas);
JMenuBar menubar = new JMenuBar();
JMenuItem newTextBox = new JMenuItem("New Text Box");
newTextBox.setMnemonic(KeyEvent.VK_E);
newTextBox.setToolTipText("Exit application");
newTextBox.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent event) {
canvas.addTextBox();
}
});
menubar.add(newTextBox);
setJMenuBar(menubar);
setSize(300, 200);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
}
class Canvas extends JPanel {
public Canvas() {
this.setOpaque(true);
//this.setBackground(Color.WHITE);
}
public void addTextBox() {
final JTextArea commentTextArea = new JTextArea(10, 10);
commentTextArea.setLineWrap(true);
commentTextArea.setLineWrap(true);
commentTextArea.setWrapStyleWord(true);
commentTextArea.setVisible(true);
}
}
The addTextBox method only creates a JTextArea. It never adds it to the JPanel
You will need to add the following line to addTextBox method:
add( commentTextArea );
In case the JFrame which contains your components is already visible on screen when the addTextBox method is called, you need to invalidate the container as well. Simply add
revalidate();
repaint();
Sorry guys I know there is a lot of info on this topic, but I'm still stuck. I have two panels mainPanel and sidePanel. What I'm trying to do is paint an Image to the sidePanel. My sidePanel will have other components such as buttons and labels. I can add the Image to the sidePanel using a JLabel, however, sizing and positioning the image is a problem. Therefor, I'm experimenting with Graphics g to paint the Image onto the sidePanel instead. If anyone could help much would be appreciated. Thanks all that help.` import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Gui extends JFrame {
private JPanel j;
private ImageIcon i;
public Gui(){
this.setSize(800,600);
this.setUp();
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
void setUp(){
j = new JPanel();
JPanel contentPanel = new JPanel();
contentPanel.setLayout(new BorderLayout());
contentPanel.setSize(new Dimension(800,600));
JPanel mainPanel = new JPanel();
JPanel sidePanel = new JPanel();
sidePanel.setPreferredSize(new Dimension(200,600));
mainPanel.setPreferredSize(new Dimension(600,600));
ImagePanel v = new ImagePanel();
//v.setBackground(Color.BLUE);
v.setPreferredSize(new Dimension(100,100));
sidePanel.add(v);
mainPanel.setBackground(Color.BLACK);
sidePanel.setBackground(Color.RED);
contentPanel.add(sidePanel, BorderLayout.WEST);
contentPanel.add(mainPanel, BorderLayout.CENTER);
this.add(contentPanel);
}
private class ImagePanel extends JPanel{
public void createImage(Graphics g){
super.paintComponent(g);
ImageIcon i = new ImageIcon("/GUI Practice/src/images.jpeg");
Image ii = i.getImage();
g.drawImage(ii, 10, 10, 90, 90, Color.WHITE, this);
repaint();
validate();
updateUI();
}
}
public static void main(String [] args){
Gui g = new Gui();
}
}
`
Taken from bcash's answer here.
public class ImagePanel extends JPanel {
private BufferedImage image;
public ImagePanel() {
try {
image = ImageIO.read(new File("image name and path"));
} catch (IOException ex) {
// handle exception...
}
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, null); // see javadoc for more info on the parameters
}
}
I have a JScrollPane and on top of it I have a JPanel named 'panel1'.
I want some rectangles to be drawn on this JPanel.
I have a class named DrawRectPanel which extends JPanel and does all the drawing stuff.
The problem is that, I tried to draw the rectangles on panel1 by writing the following code :
panel1.add(new DrawRectPanel());
but nothing appeared on panel1
then I tried, just as a test to the class DrawRectPanel :
JFrame frame = new JFrame();
frame.setSize(1000, 500);
Container contentPane = frame.getContentPane();
contentPane.add(new DrawRectPanel());
frame.show();
This worked, and produced the drawings but on a separate JFrame
How can I draw the rectangles on panel1 ?
Thanks in advance.
EDIT :
code for DrawRectPanel
public class DrawRectPanel extends JPanel {
DrawRectPanel() {
Dimension g = new Dimension(400,400);
this.setPreferredSize(g);
System.out.println("label 1");
}
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
System.out.println("label 2");
g.setColor(Color.red);
g.fillRect(20, 10, 80, 30);
}
}
only label 1 is printed on the screen
still no idea,
for example
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class CustomComponent extends JFrame {
private static final long serialVersionUID = 1L;
public CustomComponent() {
setTitle("Custom Component Graphics2D");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void display() {
add(new CustomComponents());
pack();
// enforces the minimum size of both frame and component
setMinimumSize(getSize());
setVisible(true);
}
public static void main(String[] args) {
CustomComponent main = new CustomComponent();
main.display();
}
}
class CustomComponents extends JComponent {
private static final long serialVersionUID = 1L;
#Override
public Dimension getMinimumSize() {
return new Dimension(100, 100);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(400, 300);
}
#Override
public void paintComponent(Graphics g) {
int margin = 10;
Dimension dim = getSize();
super.paintComponent(g);
g.setColor(Color.red);
g.fillRect(margin, margin, dim.width - margin * 2, dim.height - margin * 2);
}
}
instead of adding
contentPane.add(new DrawRectPanel());
you should do
contentPane.add(panel1);
Because you already have new DrawRectPanel in panel1. But in your code you are adding another instance of DrawRectPanel in contentPane. And never added panel1 in none of your container.
to fix your problem, change "paintComponent" to "paint" when the window repaints automatically, it should work.