Hey I am trying to make a some kind of launcher and the "window" must be transparent because I want the image I am using to be the design of it if you understand what I mean. I tried to do setUndecorated(true);
and setBackground(new Color(0, 0, 0, 0));
but it just looked weird. Here is a picture on how it looks: http://prntscr.com/2pqohq Here is my code:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
/**
*
* Our Launcher for the client
*
* @author Daniel <Skype: daniel.gusdal>
*
* Current Date: 5. feb. 2014 Current Time: 14:29:54
* Project: 742 client. File Name: Launcher.java
*
*/
public class Launcher2 {
public Launcher2() {
JFrame frame = new JFrame();
frame.getContentPane().add(new ImagePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//frame.pack(); //had to remove, got an error from it...
frame.setUndecorated(true); //transparent
frame.setBackground(new Color(0, 0, 0, 0)); //transparent
frame.setVisible(true);
frame.setSize(1080, 550);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable(){
public void run() {
new Launcher2();
}
});
}
@SuppressWarnings("serial")
public class ImagePanel extends JPanel {
BufferedImage img;
public ImagePanel() {
setLayout(new GridBagLayout());
try {
img = ImageIO.read(new File("C:/Users/Daniel/Pictures/Launcher3.png/"));
} catch (MalformedURLException ex) {
Logger.getLogger(Launcher2.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(Launcher2.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* Draws the image and sets the image dimension
*/
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
//g.drawImage(img, 100, 100, 1080, 550, this);
g.drawImage(img, 0, 0, getWidth(), getHeight(), this);
}
/**
* Sets the JPanel dimension
*/
public Dimension getPreferredSize() {
return new Dimension(1080, 550);
}
}
}
You can simply create your jPanel using drag and drop, as you always do and then for changing the panel's color and making it transparent or semi-transparent you can use this code: panel. setBackground(new Color(0.0f, 0.0f, 0.0f, 0.5f));
Methods : setBackground(Color c) : method to set the background color to color c. color(int r, int g, int b, int alpha) : creates a new color with specified red, green, blue and alpha value. where alpha is the value of translucency where 255 is opaque and 0 is transparent .
We can set a background color to JPanel by using the setBackground() method.
You need to set the ImagePanel
to setOpaque(false)
public ImagePanel() {
setOpaque(false);
Also you were getting the exception because you need to setUndecorate(true)
before you pack();
JFrame frame = new JFrame();
frame.add(new ImagePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
frame.pack();
frame.setBackground(new Color(0, 0, 0, 0));
frame.setVisible(true);
Those are the only two things I changed and it works. Also I got rid of the setSize()
Also use frame.setLocationRelativeTo(null);
after pack()
to center the frame.
Here's is an example (just for future readers, since I think this may be a popular question)
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.*;
public class CircleSplashScreen {
public CircleSplashScreen() {
JFrame frame = new JFrame();
frame.getContentPane().add(new ImagePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setUndecorated(true);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setBackground(new Color(0, 0, 0, 0));
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new CircleSplashScreen();
}
});
}
@SuppressWarnings("serial")
public class ImagePanel extends JPanel {
BufferedImage img;
public ImagePanel() {
setOpaque(false);
setLayout(new GridBagLayout());
try {
img = ImageIO.read(new URL("http://www.iconsdb.com/icons/preview/royal-blue/stackoverflow-4-xxl.png"));
} catch (IOException ex) {
Logger.getLogger(CircleSplashScreen.class.getName()).log(Level.SEVERE, null, ex);
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(img, 0, 0, getWidth(), getHeight(), this);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(500, 500);
}
}
}
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