I am trying to paint an image onto a panel, that is contained by a frame.
Let us say I have a 320 x 480 image.
When i try to create a frame with size 320x480 and add the panel into it, I encounter a problem.
In different operating systems, the JFrame of 320x480 is of different sizes due to title bar.
Thus my correct fit image in windows XP will not be properly painted in Windows8 or Ubuntu.
A grey patch is visible because the image was not properly placed.
I tried overriding paint method and using ImageIcon.
Please do offer a solution.
TIA
Code Snippet
CLASS PA CONTENTS
setPreferredSize(new Dimension(500,500));
.
.
JLabel image= new JLabel();
ImageIcon background = new ImageIcon(getClass().getClassLoader().getResource("Flower.jpg"));
image.setBounds(0, 0, 500, 500);
image.setIcon(background);
this.add(image); //where "this" is extending from JPanel
CLASS PB CONTENTS
frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
inserting(frame.getContentPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setResizable(false);
private void inserting(Container pane)
{
cardPanel=new JPanel();
CardLayout cards=new CardLayout();
cardPanel.setLayout(cards);
PA home= new PA();
cardPanel.add(home,"homeScreen");
pane.add(cardPanel);
}
Don't call setSize at all, call pack (as VGR stated in his comment). pack will size your JFrame based on size's of component's within it, and gaps between those component's.
Now.. issue you will encounter is that your JFrame will be small at startup. So override getPreferredSize method for your JPanel to return dimensions of your image:
public void getPreferredSize() {
return new Dimension(image.getWidth(), image.getHeight());
}
Now your image will fit perfectly and your application will be fully OS independent.
And also, do not override paint method. Instead, override paintComponent.
Here is a small demo I made in cases like yours:
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class Drawing {
JFrame frame = new JFrame();
public Drawing() {
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(new Panel());
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new Drawing();
}
});
}
class Panel extends JPanel {
BufferedImage image = null;
Panel() {
try {
image = ImageIO.read(new File("path-to-your-image"));
} catch (IOException e) {
e.printStackTrace();
}
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, this);
}
#Override
public Dimension getPreferredSize() {
// Panel will be sizes based on dimensions of image
return new Dimension(image.getWidth(), image.getHeight());
}
}
}
It seems to be the layout problem. The most obvious solution is to wrap you image panel into another container with proper layout, so your panel will always have the same size.
Related
what's the easiest way to have a drawing in a JPanel that resizes whenever the user resizes the JFrame?
I know that I can auto resize the panel with a BorderLayout but the drawings are not resized in this case. I am new to java and GUI programming and there are probably numerous solutions.
please give me a hint into the right direction to make e.g. the rectangle in
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.*;
public class DrawRect extends JPanel {
#Override
protected void paintComponent(Graphics g) {
g.drawRect(20, 20, 100, 100);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
DrawRect panel = new DrawRect();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setPreferredSize(new Dimension(200, 200));
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}
auto-resizing whenever the frame is resized.
Provide positions and sizes as a proportion of the width and height of the panel. Whenever the panel is resized, the rendering engine will schedule a call to the paintComponent() method and the rectangle will be drawn proportionally. E.G.
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.*;
public class DrawRect extends JPanel {
#Override
protected void paintComponent(Graphics g) {
int w = getWidth();
int h = getHeight();
g.drawRect(w/10, h/10, w/2, h/2);
}
/* A custom component should give the layout manager hints as to
its preferred size. */
#Override
public Dimension getPreferredSize() {
return new Dimension(200,200);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
DrawRect panel = new DrawRect();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}
frame.getContentPane().setLayout(new BorderLayout());
Insert the line before you add the component to the GUI.
You should study layoutmanagers, since it is a unique concept in Java.
Hi I Would like add to my JFrame border some image.
Is this Possible to attach picture to borders for JFrame and create it as 1 object ?
Something like this:
I'm not sure if it's possible to add the image directly to the border of a JFrame (suggestions welcome). I decided to solve this issue by using a transparent content pane, and using an inner frame to "appear" like the outer frame.
The code is pretty simple, however, let me know if you'd like an explanation of how the code works.
Here's the minimum code you'll need to get up and running.
You'll need to provide your own transparent-phone.png image, in the root of the classpath (i.e. next to your PhoneWindow.java file, in the root package).
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
public class PhoneWindow {
public static void main(String[] args) {
new PhoneWindow();
}
public PhoneWindow() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// create the inner frame
final JInternalFrame frame2 = new JInternalFrame("My Telephone");
frame2.setClosable(true);
frame2.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
// add elements to the outer frame
frame.setUndecorated(true);
frame.setBackground(new Color(0, 0, 0, 0));
JPanel pane = new TranslucentPane();
frame.setContentPane(pane);
frame.setLayout(new BorderLayout());
// add inner frame and phone picture
frame.add(frame2, BorderLayout.CENTER);
frame.add(new JLabel(new ImageIcon(ImageIO.read(getClass().getResource("/transparent-phone.png")))), BorderLayout.EAST);
frame.setLocationRelativeTo(null);
frame.setMinimumSize(new Dimension(400, 300));
frame.pack();
// show
frame2.setVisible(true);
frame.setVisible(true);
} catch (Throwable ex) {
ex.printStackTrace();
}
}
});
}
public class TranslucentPane extends JPanel {
public TranslucentPane() {
setOpaque(false);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(0f));
g2d.setColor(getBackground());
g2d.fillRect(0, 0, getWidth(), getHeight());
}
}
}
Here's the full Java class (including close and draggable behaviour)
https://gist.github.com/nickgrealy/16901a6428cb79d4f179
And here's a screenshot of the final product
N.B. the transparent sections inside/outside the phone.
References:
How to make a transparent JFrame but keep everything else the same?
Trying to disable dragging of a JInternalFrame
I'm trying to set the the location of an image in a JFrame. I thought label.setLocation(100, 100); would set the location of the image to 100, 100 (top left corner), but it doesn't seem to do anything no matter were I put it. I even tried panal.setLocation(100, 100). Both do nothing, I get no errors and the image does appears but at 0, 0. What am I doning wrong? Here's my code:
import javax.swing.*;
public class DisplayImage {
public DisplayImage() {
JFrame frame = new JFrame("Display Image");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = (JPanel)frame.getContentPane();
JLabel label = new JLabel();
label.setIcon(new ImageIcon("src/img/school.png"));
label.setLocation(100, 100);
panel.add(label);
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
public static void main (String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DisplayImage();
}
});
}
}
By default a JFrame uses a BorderLayout. When you add your label to the frame the label is added to the CENTER of the BorderLayout. The layout manager will override the location.
One simple solution is to add an EmptyBorder to the label with the top/left insets being 100. Then instead of add the label to the center you would add the label to the NORTH. The code would be something like:
label.setBorder( new EmptyBorder(...) );
panel.add(label, BorderLayout.SOUTH);
As a general rule you should not be trying to specify exact location of a component. Let the layout managers to their jobs.
The JFrame, by default, uses a BorderLayout as it's layout manager. This will override any settings you supply to the setLocation method.
You have a number of options...
Use something like JLayeredPane, which does not, but default, have layout manager of it's own set by default. See How to use layered panes for more details
Create a custom component capable of renderering the image where you want it. Check out Performing Custom Painting for more details
Create your own layout manager that performs the operations you want...
This works for me:
import java.awt.Dimension;
import javax.swing.*;
public class DisplayImage {
public DisplayImage() {
JFrame frame = new JFrame("Display Image");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = (JPanel)frame.getContentPane();
panel.setLayout(null);
JLabel label = new JLabel();
label.setIcon(new ImageIcon("rails.png"));
panel.add(label);
Dimension size = label.getPreferredSize();
label.setBounds(100, 100, size.width, size.height);
frame.setSize(300, 200);
frame.setVisible(true);
}
public static void main (String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DisplayImage();
}
});
}
}
But you should read this:
http://docs.oracle.com/javase/tutorial/uiswing/layout/none.html
Good day!
Is it possible to add a JPanel on top of a JLabel?
I would like my JFrame to have a background image and in order to this, i used this code (based from past stackoverflow answers):
setLocation(150,50);
setSize(700,650);
setVisible(true);
JLabel contentPane = new JLabel();
contentPane.setIcon(new ImageIcon("pics/b1.jpg"));
contentPane.setLayout( new BorderLayout());
setContentPane( contentPane );
Now my problem is, I cannot put a panel on my JFrame because of the JLabel background.
Please help.
Thanks.
To create a background image for a JFrame, I recommend that you draw the image in the paintComponent method of a JPanel, and then add this JPanel to the contentPane BorderLayout.CENTER which has it fill the contentPane. You may even want to set the JPanel's preferredSize to be that of the Image. Then you can add any components you'd like to the image panel, and don't have to worry about trying to add comopnents to a JLabel which seems bass ackwards to me.
For example here's a program that does this but slightly different. It creates an ImagePanel object, a JPanel that draws an image and sizes itself to the image and then places it in a JScrollPane which is then added to the contentPane, but you can just get rid of the JScrollPane and put your image JPanel directly in the contentPane instead:
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;
public class BigDukeImage {
public static final String IMAGE_PATH = "http://" + "duke.kenai.com/nyanya/NyaNya.jpg";
private static final Dimension SCROLLPANE_SIZE = new Dimension(900, 700);
private static void createAndShowUI() {
Image image = null;
try {
URL url = new URL(IMAGE_PATH);
image = ImageIO.read(url);
// JLabel label = new JLabel(new ImageIcon(image));
ImagePanelA imagePanel = new ImagePanelA(image);
JScrollPane scrollpane = new JScrollPane();
// scrollpane.getViewport().add(label);
scrollpane.getViewport().add(imagePanel);
scrollpane.setPreferredSize(SCROLLPANE_SIZE);
JFrame frame = new JFrame("Big Duke Image");
frame.getContentPane().add(scrollpane);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
JScrollBar vertSBar = scrollpane.getVerticalScrollBar();
JScrollBar horzSBar = scrollpane.getHorizontalScrollBar();
vertSBar.setValue((vertSBar.getMaximum() - vertSBar.getVisibleAmount()) / 2);
horzSBar.setValue((horzSBar.getMaximum() - horzSBar.getVisibleAmount()) / 2);
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}
#SuppressWarnings("serial")
class ImagePanelA extends JPanel {
private Image image;
public ImagePanelA(Image image) {
this.image = image;
setPreferredSize(new Dimension(image.getWidth(null), image.getHeight(null)));
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (image != null) {
g.drawImage(image, 0, 0, null);
}
}
}
You could use a JLayeredPane. This lets you add components to different layers and have them ontop of one another.
I cannot put a panel on my JFrame because of the JLabel background
Thats because a panel is opague so it paints over top of the label. You need to use:
panel.setOpaque( false );
sure..you can....Use NetBEans IDE to simplify tedious tasks like this by drag and drop and write the actual programming..
I have created one GUI using Swing of Java. I have to now set one sample.jpeg image as a background to the frame on which I have put my components.How to do that ?
There is no concept of a "background image" in a JPanel, so one would have to write their own way to implement such a feature.
One way to achieve this would be to override the paintComponent method to draw a background image on each time the JPanel is refreshed.
For example, one would subclass a JPanel, and add a field to hold the background image, and override the paintComponent method:
public class JPanelWithBackground extends JPanel {
private Image backgroundImage;
// Some code to initialize the background image.
// Here, we use the constructor to load the image. This
// can vary depending on the use case of the panel.
public JPanelWithBackground(String fileName) throws IOException {
backgroundImage = ImageIO.read(new File(fileName));
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
// Draw the background image.
g.drawImage(backgroundImage, 0, 0, this);
}
}
(Above code has not been tested.)
The following code could be used to add the JPanelWithBackground into a JFrame:
JFrame f = new JFrame();
f.getContentPane().add(new JPanelWithBackground("sample.jpeg"));
In this example, the ImageIO.read(File) method was used to read in the external JPEG file.
This is easily done by replacing the frame's content pane with a JPanel which draws your image:
try {
final Image backgroundImage = javax.imageio.ImageIO.read(new File(...));
setContentPane(new JPanel(new BorderLayout()) {
#Override public void paintComponent(Graphics g) {
g.drawImage(backgroundImage, 0, 0, null);
}
});
} catch (IOException e) {
throw new RuntimeException(e);
}
This example also sets the panel's layout to BorderLayout to match the default content pane layout.
(If you have any trouble seeing the image, you might need to call setOpaque(false) on some other components so that you can see through to the background.)
The Background Panel entry shows a couple of different ways depending on your requirements.
You can either make a subclass of the component
http://www.jguru.com/faq/view.jsp?EID=9691
Or fiddle with wrappers
http://www.java-tips.org/java-se-tips/javax.swing/wrap-a-swing-jcomponent-in-a-background-image.html
Perhaps the easiest way would be to add an image, scale it, and set it to the JFrame/JPanel (in my case JPanel) but remember to "add" it to the container only after you've added the other children components.
ImageIcon background=new ImageIcon("D:\\FeedbackSystem\\src\\images\\background.jpg");
Image img=background.getImage();
Image temp=img.getScaledInstance(500,600,Image.SCALE_SMOOTH);
background=new ImageIcon(temp);
JLabel back=new JLabel(background);
back.setLayout(null);
back.setBounds(0,0,500,600);
Here is another quick approach without using additional panel.
JFrame f = new JFrame("stackoverflow") {
private Image backgroundImage = ImageIO.read(new File("background.jpg"));
public void paint( Graphics g ) {
super.paint(g);
g.drawImage(backgroundImage, 0, 0, null);
}
};
if you are using netbeans you can add a jlabel to the frame and through properties change its icon to your image and remove the text. then move the jlabel to the bottom of the Jframe or any content pane through navigator
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class BackgroundImageJFrame extends JFrame
{
JButton b1;
JLabel l1;
public BackgroundImageJFrame()
{
setTitle("Background Color for JFrame");
setSize(400,400);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
/*
One way
-----------------*/
setLayout(new BorderLayout());
JLabel background=new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads\\colorful design.png"));
add(background);
background.setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
background.add(l1);
background.add(b1);
// Another way
setLayout(new BorderLayout());
setContentPane(new JLabel(new ImageIcon("C:\\Users\\Computer\\Downloads \\colorful design.png")));
setLayout(new FlowLayout());
l1=new JLabel("Here is a button");
b1=new JButton("I am a button");
add(l1);
add(b1);
// Just for refresh :) Not optional!
setSize(399,399);
setSize(400,400);
}
public static void main(String args[])
{
new BackgroundImageJFrame();
}
}