This question already has an answer here:
Closed 11 years ago.
Possible Duplicate:
Using an image for the background of a JPanel and JButton
Similar question to this one HAVE been asked before, but this is slightly different. I want to know if anyone knows how to set the BACKGROUND of a JPanel/JFrame in swing. I need to place buttons and text fields OVER this image eventually. All the solutions on here so far have been adding the image to a JPanel which doesn't work when I use GridLayout etc.
You may create a custom JPanel by inheriting it which paint the given image as background. Here is the code. Here is an example:
public class ImagePanel extends JPanel {
private Image img;
public ImagePanel(String img) {
this(new ImageIcon(img).getImage());
}
public ImagePanel(Image img) {
this.img = img;
Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
setPreferredSize(size);
setMinimumSize(size);
setMaximumSize(size);
setSize(size);
setLayout(null);
}
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, null);
}
}
Related
//Calling function
ImagePanel Panel_2 = new ImagePanel(new ImageIcon("C:/Users/kagarwal/Downloads/intacct_logo_standard_web.png").getImage());
Panel_2.add(new JButton());
Panel_2.revalidate();
//Called function
public class ImagePanel extends JPanel {
private Image img;
public ImagePanel(String img) {
this(new ImageIcon(img).getImage());
}
public ImagePanel(Image img) {
this.img = img;
Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
setPreferredSize(size);
setMinimumSize(size);
setMaximumSize(size);
setSize(size);
setLayout(null);
}
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, null);
}
}
Requirement is: that JPanel2 needs to have a background image, and on top of that we need to add JButton. But, issue here is that the newly added JButton does not appears in the given JPanel, it only shows background image. Am i missing refresh ?
The problem is in paintComponent, where you only ask the graphics object to draw the image.
But you should call the superclass paintComponent method by invoking super.paintComponent() passing the graphics object, in order to have all the components of the panel correctly displayed.
I am new to making GUIs so I decided to try the the windows builder for eclipse, and while great I do have some doubts. I have been searching but I cannot seen to find a good way to add a background image to my "menu". For example I tried this:
public Menu() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(50, 50, 300, 250); //Dimensiones
contentPane = new JPanel() { //Imagen de Fondo
public void paintComponent(Graphics g) {
Image img = Toolkit.getDefaultToolkit().getImage(
Menu.class.getResource("/imgs/rotom.jpg"));
g.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), this);
}
};
And adding the following classes:
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
But to no avail the window remains with its dull grey color, so far my code is just the standard one WindowsBuilder cooks for you plus 4 buttons but I doubt they're of importance here. Shouldn't the code I added override the paintComponent() method of the jPanel and draw the image in it?
The class for the menu is in a package within my project and the image is within a imgs package is within the same project as well.
Thanks a lot in advance.
A simple method, if you're not interested in resizing the background image or applying any effects is to use a JLabel...
BufferedImage bg = ImageIO.read(Menu.class.getResource("/imgs/rotom.jpg"));
JLabel label = new JLabel(new ImageIcon(bg));
setContentPane(label);
setLayout(...);
There are limitations to this approach (beyond scaling), in that the preferred size of the label will always be that of the image and never take into account it's content. This is both good and bad.
The other approach, which you seem to be using, is to use a specialised component
public class BackgroundPane extends JPanel {
private BufferedImage img;
public BackgroundPane(BufferedImage img) {
this.img = img;
}
#Override
public Dimension getPreferredSize() {
return img == null ? super.getPreferredSize() : new Dimension(img.getWidth(), img.getHeight());
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(img, 0, 0, this);
}
}
You should avoid trying to perform any task in the paintComponent method which may take time to complete as paintComponent may be called often and usually in quick succession....
Getting the image to scale when the component is resized is an entire question into of it self, for some ideas, you could take a look at...
Java: maintaining aspect ratio of JPanel background image
Java: JPanel background not scaling
Quality of Image after resize very low -- Java
Reading/Loading images
Oh, and, you should avoid extending directly from top level containers, like JFrame, they reduce the reusability for your components and lock you into a single container
This question already has answers here:
How to add an image to a JPanel?
(14 answers)
Closed 8 years ago.
i am using netbeans IDE problem is how to set background image for JPanel without using JLabel. Can anyone tell me how to do this?
This is fairly straight forward.
public class ImagePanel extends JPanel{
Image image;
public ImagePanel(Image image){
this.image = image;
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0,0, this);
}
}
If you want more complex have a look at this link. This has a couple of settings like fit image to panel...
This question already has answers here:
How to add an image to a JPanel?
(14 answers)
Closed 8 years ago.
I am trying to display a jpeg image to a panel in a JPanel. I have two panels panel, and panel1. I'm trying to display the image in one panel and then remove the panel to display another.
panel.g2d.drawImage(myimage, 0, 0, null);
It gives me about 50 errors and I can't type them all because I'm writing this on my phone because I don't have Internet right now.
Why not just use a JLabel instead?
Image image = ImageIO.read(getClass().getResource("/images/MyImage.png"));
JLabel label = new JLabel(new ImageIcon(image));
panel.add(label);
Use Buffered Image with JPanel. Here is an example
try{
BufferedImage myPicture = ImageIO.read(new File("c://pic.jpg"));
picLabel = new JLabel(new ImageIcon(myPicture));
picLabel.setHorizontalAlignment(SwingConstants.CENTER);
frame.getContentPane().add(picLabel);
}catch (IOException e){}
To display an image in a panel, override the paintComponent(Graphics) method and draw it there:
public class ImagePanel extends JPanel {
private Image image;
public void setImage (Image image) {
this.image = image;
revalidate();
repaint();
}
#Override
protected void paintComponent (Graphics g) {
super.paintComponent(g);
if (image != null)
g.drawImage(image, 0, 0, this);
}
}
you also should override the getPreferredSize() method to expose how large your image component should be (will be used by the layout manager of the parent container):
#Override
public Dimension getPreferredSize () {
if (image == null) {
return super.getPreferredSize();
}
Insets insets = getInsets();
return new Dimension(image.getWidth(this) + insets.left + insets.right, image.getHeight(this) + insets.top + insets.bottom);
}
Edit: JLabel (as pointed out by the other answers) is fine for displaying simple images or icons, but when you need advanced features such as automatic up-/downscaling (with or without keeping proportions), tiling (x, y, both), it's usually better to create a specialized image panel class for that.
So im making a gui, and i have a background image for it. i dont know how to make it set as the background, so any help with that would be good. an explination would also be good. also, after we get that image as a background, how do we get the image resize to the size of the window. such as
image.setSize(frame.getHeight(), frame.getWidth());
but i dont know if that would work. the image name is ABC0001.jpg and the frame name is frame. thanks!
To get the image to resize, you can either use
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, getWidth(), getHeight(), this); // draw the image
}
or you can use a componentlistener, implemented like:
final Image img = ...;
ComponentListener cl = new ComponentAdapter() {
public void componentResized(ComponentEvent ce) {
Component c = ce.getComponent();
img = im1.getScaledInstance(c.getWidth(), c.getHeight(), Image.SCALE_SMOOTH);
}
};
Image quality will degrade over time with the second solution, so it is recommended that you keep the original and the copy separate.
Create a class the extends JPanel. Have that class load the image by overriding paintComponent
class BackgroundPanel extends JPanel
{
Image img;
public BackgroundPanel()
{
// Read the image and place it in the variable img so it can be used in paintComponent
img = Toolkit.getDefaultToolkit().createImage("ABC0001.jpg");
}
public void paintComponent(Graphics g)
{
g.drawImage(img, 0, 0, null); // draw the image
}
}
Now that you have this class, simply add this to your JFrame (or whereever you want the background).
//create refrence if you want to add stuff ontop of the panel
private BackgroundPanel backGroundPanel;
//constructor
add(backGroundPanel, BorderLayout.CENTER);
The size of the background will fill the entire frame so no need to scale it unless you want it smaller