My problem is that background image covers all ImageIcons I use in my JPanel. For example, in this code snippet, I'm trying to setIcon to one of the labels I have in my Panel. But the background image covers it. How can I fix this? It doesn't matter if I use label.setIcon() outside of paint method or inside of it.
public void paint(Graphics g) {
super.paint(g);
g.drawImage(backgroundImage, 0, 0, this);
label1.setIcon(iconImage);
}
Thanks in advance!
Set the layout of your base panel to BorderLayout
Add a JLabel to the base pane, setting its icon to the background image
Set the layout if the JLabel to what ever you need
Add the remaining components to this label
Try placing the label.seticon outside the overridden method.
Refer to:
How to set JFrame or JPanel Background Image in Eclipse Helios
you can implement it as;
public void paintComponent(Graphics g) {
g.drawImage(img, 0, 0, null);
}
OR
public void paint(Graphics g) {
if (img!=null) g.drawImage(img, 0, 0, null);
super.paint(g);
}
Related
I want to update an image in Java Swing and tried two different methods of rendering these images.
Define a JLabel and set the icon of it
Override the paintComponent(Graphics g) function in a custom JPanel and call g.drawImage(img, 0, 0, null)
Rendering the first image works as expected in both ways, but if I'm trying to update the image, it doesn't replace but renders one layer above which is a problem, because the images I want to render are semi-transparent, so you can see the others through.
I'm already using the repaint() method.
Method 1
public void setImage(Image img) {
this.backgroundLabel.setIcon(new ImageIcon(img));
this.repaint();
}
Method 2
public void setImage(Image img) {
this.img = img;
this.repaint();
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(img, 0, 0, null);
}
I'm thankful for any tips! <3
The first thing line in paintComponent(Graphics g) should be
super.paintComponent(g);
This clears the panel, does any background painting if necessary, and any other support functions from the overridden paintComponent method. Otherwise, you will keep drawing images over the previous ones without first clearing them.
For anyone in the future with the same problem, here is the answer I came up with.
I didn't repainted the full frame, but only the JPanel.
I had to add
frame.repaint();
in setImage().
This question already has an answer here:
Error loading background image into JPanel in a JFrame
(1 answer)
Closed 2 years ago.
I insert a background image into a JPanel but some interface elements disappear. The following Java Swing elements do not appear:
label_titulo
label_usuario
label_password
button_acceder
**Can you make the image transparent or that the elements are not opaque (setOpaque (false)), even putting it to those elements does not work for me.
Why do some elements have rectangles encapsulating them in gray?**
Code:
public class InicioSesion extends javax.swing.JFrame{
private Image imagenFondo;
private URL fondo;
public InicioSesion(){
initComponents();
try{
fondo = this.getClass().getResource("fondo.jpg");
imagenFondo = ImageIO.read(fondo);
}catch(IOException ex){
ex.printStackTrace();
System.out.print("Imagen no cargada.");
}
}
#Override
public void paint(Graphics g){
super.paint(g);
g.drawImage(imagenFondo, 0, 0, getWidth(), getHeight(), this);
}
}
When loading "RUN" the .java file appears to me as follows:
Originally the design is as follows:
public void paint(Graphics g){
super.paint(g);
g.drawImage(imagenFondo, 0, 0, getWidth(), getHeight(), this);
}
Don't override paint(). The paint method is responsible for painting the child components. So your code paints the child components and then draws the image over top of the components.
Instead, for custom painting of a component you override the paintComponent() method of a JPanel:
protected void paintComponent(Graphics g){
super.paintComponent(g);
g.drawImage(imagenFondo, 0, 0, getWidth(), getHeight(), this);
}
Read the section from the Swing tutorail on A Closer Look at the Paint Mechanism for more information.
Edit:
Read the entire section from the Swing tutorial on Custom Painting. The solution is to do the custom painting on a JPanel and then add the panel to the frame.
The content pane of a frame is a JPanel. So you will in effect be replacing the default content pane with your custom JPanel that paints the background image. Set the layout of your custom panel to a BorderLayout and it will work just like the default content pane.
My problem is that when I create or draw an image in JFrame by using
public void paint(Graphics g)
{}
Method I am getting a black screen instead of the image the problem code snippet is
ImageIcon i=new ImageIcon("logo.png);
Image im=i.getImage();
public void paint(Graphics g)
{
g=getGraphics();
}
Please suggest me an alternative method or solution to my problem
Thanks in advance
Would you consider using a JPanel and overriding the paintComponent method? Something like this:
BufferedImage image = ... //i'll leave this blank since there are several ways to get a bufferedimage. I'll leave an eg: ImageIO.read(new File("/path/to/image"));
JPanel pane = new JPanel() {
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, null);
}};
and then adding the panel to your frame. You can do the same with the container in the JFrame. The logic is simillar.
I have a Problem:
I'm rendering a BufferedImage in a JFrame. Then i add a JButton to the same frame.
when i try to make the button transparent, the button becomes transparent, but disregarding its actual position, its always transparent like it is stuck in the top left corner of the frame.
I testet some different methods to make the button transparent, always with the same result.
any ideas?
thanks
public class TestPanel extends JPanel {
public TestPanel(){
JButton foo = new JButton("test");
foo.setBackground(new Color(0, 0, 0, 0));
foo.setBounds(20, 100, 300, 50);
this.add(foo);
}
public void paint(Graphics g){
Graphics2D g2 = (Graphics2D) g;
g2.drawImage(ImageFactory.getImg(), 0, 0, null); //get a BufferedImage
g2.dispose();
}
}
I see several problems, even if I'm not sure on which of them cause your problem.I try to list them in order:
Your TestPanel doesn't specify a LayoutManager (I hope you are specifying it somewhere else in your code).
You are extending a JPanel without call super paintComponent method (don't use paint). You should do this before anything else in your paintComponent method:
public void paintComponent(Graphics g){
super.paintComponent(g);
}
remove the dispose method call. You must not destroy your graphic object.
EDIT:
this is a problem:
foo.setBounds(20, 100, 300, 50);
you are trying to explicitly set the bounds of your JButton. You shouldn't do that. If you are using a LayoutManager it probably ignore this directive. If you are using a null layout this could be a problem too.
Several problems
it's wrong to override paint, instead override paintComponent
the button has a fully transparent background but returns true for opaque, thus fooling the paint mechanism
it's wrong to dispose the Graphics passed in as parameter
working code (Edit: accidentally removed the transparent color-setting line, fixed)
public TestPanel(){
JButton foo = new JButton("test");
foo.setBackground(new Color(0, 0, 0, 0));
foo.setOpaque(false);
foo.setBorder(BorderFactory.createLineBorder(Color.RED));
this.add(foo);
}
#Override
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.drawImage(ImageFactory.getImg(), 0, 0, null); //get a BufferedImage
// g2.dispose();
}
As others already noted: LayoutManagers are a must in Swing/AWT - not using them makes the ui code brittle and hard to maintain.
setBound() will work only if you have set your layout to null. Your code does not say anything like that.
Now, the default layout manager of JPanel is FlowLayout. By default, this layout manager will arrange your components from left to right then top to bottom.
Now, to make your code work as expected. Add this line inside your constructor: setLayout(null).
But remember, setting the layout to null is a very poor practice.
Also, the points Heisenbug has mentioned are very worthy. Try to follow them.
How do I set a background image to a JTextPane - some sort of a watermark.
I tried this option - creating a child class of JTextPane and use the paint method to draw the image.
But then the text is displayed "below" the image than above.
Is there any "standard" or "well known" way to do this?
(BTW, I tried (something silly?) making the content type "text/html", and setting the image as the background image of a <div> but it did not help.)
Here's a working example:
import javax.swing.*;
import java.awt.*;
public class ScratchSpace {
public static void main(String[] args) {
JFrame frame = new JFrame("");
final MyTextPane textPane = new MyTextPane();
frame.add(textPane);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static class MyTextPane extends JTextPane {
public MyTextPane() {
super();
setText("Hello World");
setOpaque(false);
// this is needed if using Nimbus L&F - see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6687960
setBackground(new Color(0,0,0,0));
}
#Override
protected void paintComponent(Graphics g) {
// set background green - but can draw image here too
g.setColor(Color.GREEN);
g.fillRect(0, 0, getWidth(), getHeight());
// uncomment the following to draw an image
// Image img = ...;
// g.drawImage(img, 0, 0, this);
super.paintComponent(g);
}
}
}
The important things to note:
your component must not be opaque...
so setOpaque(false);
override paintComponent(Graphics g), not paint.
paint your background, with an image
or drawing BEFORE calling
super.paintComponent(g);
If you want to master this stuff, I recommend reading "Filthy Rich Clients", a book all about how to bend Swing to your will.
Try changing the paint code to this.
public void paint(Graphics g)
{
g.setXORMode(Color.white);
g.drawImage(image,0, 0, this);
super.paint(g);
}
This would make your image to be painted before the text is rendered by the actual component's paint method.
Hmm., put a background image to the JFrame/JPanel containg the JTextPane,.. and keep the JTextPane transparent to some level.