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.
Related
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.
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);
}
my goal is to draw some bufferedimage onto another. then all this stuff draw onto some other bufferedimage and so on. And finally draw this on top of a panel.
For now i'm trying to draw bufferedimage onto panel and nothing works. My bufferedimage looks completely white:
public class Main2 {
public static void main(String[] args) {
JFrame frame = new JFrame("asdf");
final JPanel panel = (JPanel) frame.getContentPane();
frame.setSize(500,500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
panel.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
somepaint(panel);
}
});
}
private static void somepaint(JPanel panel) {
BufferedImage image = new BufferedImage(200,200,BufferedImage.TYPE_INT_ARGB);
image.getGraphics().setColor(Color.red);
image.getGraphics().fillRect(0, 0, 200, 200);
Graphics2D graphics = (Graphics2D) panel.getGraphics();
graphics.setColor(Color.magenta);
graphics.fillRect(0, 0, 500, 500);
graphics.drawImage(image, null, 0, 0); // draws white square instead of red one
}
}
thanks
Re:
private static void somepaint(JPanel panel) {
BufferedImage image = new BufferedImage(200,200,BufferedImage.TYPE_INT_ARGB);
image.getGraphics().setColor(Color.red);
image.getGraphics().fillRect(0, 0, 200, 200);
Graphics2D graphics = (Graphics2D) panel.getGraphics();
This is not how you draw inside of a JPanel or JComponent.
Don't call getGraphics() on a component as the Graphics object returned will be short-lived, and anything drawn with it will not persist. Instead do your JPanel's drawing inside of its paintComponent(Graphics G) method override. You will need to create a class that extends JPanel in order to override paintComponent(...).
Most importantly, to see how to do Swing graphics correctly, don't guess. You'll want to read the Swing Graphics Tutorials first as it will require you to toss out some incorrect assumptions (I know that this is what I had to do to get it right).
You need to rectify your parameters in the drawImage() call. Change this:
graphics.drawImage(image, null, 0, 0);
to
graphics.drawImage(image, 0, 0,null);
Check the Java docs for more details.
Can JPanels background be set to transparent?
My frame is has two JPanels:
Image Panel and
Feature Panel.
Feature Panel is overlapping Image Panel.
The Image Panel is working as a background and it loads image from a remote URL.
On Feature Panel I want to draw shapes. Now Image Panel cannot be seen due to Feature Panel's background color.
I need to make Feature Panel background transparent while still drawing its shapes and I want Image Panel to be visible (since it is doing tiling and cache function of images).
I'm using two JPanel's, because I need to seperate the image and shape drawing .
Is there a way the overlapping Jpanel have a transparent background?
Calling setOpaque(false) on the upper JPanel should work.
From your comment, it sounds like Swing painting may be broken somewhere -
First - you probably wanted to override paintComponent() rather than paint() in whatever component you have paint() overridden in.
Second - when you do override paintComponent(), you'll first want to call super.paintComponent() first to do all the default Swing painting stuff (of which honoring setOpaque() is one).
Example -
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TwoPanels {
public static void main(String[] args) {
JPanel p = new JPanel();
// setting layout to null so we can make panels overlap
p.setLayout(null);
CirclePanel topPanel = new CirclePanel();
// drawing should be in blue
topPanel.setForeground(Color.blue);
// background should be black, except it's not opaque, so
// background will not be drawn
topPanel.setBackground(Color.black);
// set opaque to false - background not drawn
topPanel.setOpaque(false);
topPanel.setBounds(50, 50, 100, 100);
// add topPanel - components paint in order added,
// so add topPanel first
p.add(topPanel);
CirclePanel bottomPanel = new CirclePanel();
// drawing in green
bottomPanel.setForeground(Color.green);
// background in cyan
bottomPanel.setBackground(Color.cyan);
// and it will show this time, because opaque is true
bottomPanel.setOpaque(true);
bottomPanel.setBounds(30, 30, 100, 100);
// add bottomPanel last...
p.add(bottomPanel);
// frame handling code...
JFrame f = new JFrame("Two Panels");
f.setContentPane(p);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300, 300);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
// Panel with a circle drawn on it.
private static class CirclePanel extends JPanel {
// This is Swing, so override paint*Component* - not paint
protected void paintComponent(Graphics g) {
// call super.paintComponent to get default Swing
// painting behavior (opaque honored, etc.)
super.paintComponent(g);
int x = 10;
int y = 10;
int width = getWidth() - 20;
int height = getHeight() - 20;
g.drawArc(x, y, width, height, 0, 360);
}
}
}
Alternatively, consider The Glass Pane, discussed in the article How to Use Root Panes. You could draw your "Feature" content in the glass pane's paintComponent() method.
Addendum: Working with the GlassPaneDemo, I added an image:
//Set up the content pane, where the "main GUI" lives.
frame.add(changeButton, BorderLayout.SOUTH);
frame.add(new JLabel(new ImageIcon("img.jpg")), BorderLayout.CENTER);
and altered the glass pane's paintComponent() method:
protected void paintComponent(Graphics g) {
if (point != null) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setComposite(AlphaComposite.getInstance(
AlphaComposite.SRC_OVER, 0.3f));
g2d.setColor(Color.yellow);
g2d.fillOval(point.x, point.y, 120, 60);
}
}
As noted here, Swing components must honor the opaque property; in this variation, the ImageIcon completely fills the BorderLayout.CENTER of the frame's default layout.
In my particular case it was easier to do this:
panel.setOpaque(true);
panel.setBackground(new Color(0,0,0,0,)): // any color with alpha 0 (in this case the color is black
(Feature Panel).setOpaque(false);
Hope this helps.
To set transparent you can set opaque of panel to false like
JPanel panel = new JPanel();
panel.setOpaque(false);
But to make it transculent use alpha property of color attribute like
JPanel panel = new JPanel();
panel.setBackground(new Color(0,0,0,125));
where last parameter of Color is for alpha and alpha value ranges between 0 and 255 where 0 is full transparent and 255 is fully opaque
public void paintComponent (Graphics g)
{
((Graphics2D) g).setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,0.0f)); // draw transparent background
super.paintComponent(g);
((Graphics2D) g).setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,1.0f)); // turn on opacity
g.setColor(Color.RED);
g.fillRect(20, 20, 500, 300);
}
I have tried to do it this way, but it is very flickery
As Thrasgod correctly showed in his answer, the best way is to use the paintComponent, but also if the case is to have a semi transparent JPanel (or any other component, really) and have something not transparent inside. You have to also override the paintChildren method and set the alfa value to 1.
In my case I extended the JPanel like that:
public class TransparentJPanel extends JPanel {
private float panelAlfa;
private float childrenAlfa;
public TransparentJPanel(float panelAlfa, float childrenAlfa) {
this.panelAlfa = panelAlfa;
this.childrenAlfa = childrenAlfa;
}
#Override
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(getBackground());
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setComposite(AlphaComposite.getInstance(
AlphaComposite.SRC_OVER, panelAlfa));
super.paintComponent(g2d);
}
#Override
protected void paintChildren(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(getBackground());
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setComposite(AlphaComposite.getInstance(
AlphaComposite.SRC_ATOP, childrenAlfa));
super.paintChildren(g);
}
//getter and setter
}
And in my project I only need to instantiate Jpanel jp = new TransparentJPanel(0.3f, 1.0f);, if I want only the Jpanel transparent.
You could, also, mess with the JPanel shape using g2d.fillRoundRect and g2d.drawRoundRect, but it's not in the scope of this question.