I want to display variations of the same image in the same JFrame, for example display an image in JFrame, then replace it with gray scale of the same image.
To build on camickr's solution (for the lazy like me who want quick code to copy/paste) here's a code illustration:
JFrame frame = new JFrame();
frame.getContentPane().setLayout(new FlowLayout());
frame.getContentPane().add(new JLabel(new ImageIcon(img)));
frame.getContentPane().add(new JLabel(new ImageIcon(img2)));
frame.getContentPane().add(new JLabel(new ImageIcon(img3)));
frame.pack();
frame.setVisible(true);
//frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // if you want the X button to close the app
You will have to repaint the JFrame whenever you update the image.
Here is what a simple google on the topic brings up: (I use those tutorials for all my Java coding)
Java Tutorial: Drawing an Image
Just incase life's to short too read the official docs here's a dirty way to get it done multiple times over
private static JFrame frame;
private static JLabel label;
public static void display(BufferedImage image){
if(frame==null){
frame=new JFrame();
frame.setTitle("stained_image");
frame.setSize(image.getWidth(), image.getHeight());
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
label=new JLabel();
label.setIcon(new ImageIcon(image));
frame.getContentPane().add(label,BorderLayout.CENTER);
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}else label.setIcon(new ImageIcon(image));
}
I'm not really sure what you question is but if you have a BufferedImage then you simply create an ImageIcon using the image, then you add the icon to a JLabel and add the label to the GUI like any other component.
If you question is about how to create a gray scale, the I suggest you search the web using those terms as the search keywords, I'm sure you will find examples out there.
Related
I'm developing a game in Java Swing. I use absolut coords and a fixed window size in order to set every element in its place. But if I resize the JFrame, the drawn elements dont scale. How can I achieve that?
In my example I would set the default window size to 1280 x 720 and develop the game according to this size. Then it'd be perfect to just let java automatically resize the elements.
If you want a fixed size window, you can use JFrame.setResizable(boolean) API to make your window non-resizable. Example:
public class FixedSizeJFrame
{
public static void main(String[] args)
{
JFrame frame = new JFrame("My Title");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBounds(100, 100, 1280, 720);
frame.getContentPane().add(new JLabel("My Label"), BorderLayout.NORTH);
frame.getContentPane().add(new JTextArea("Sample text"), BorderLayout.CENTER);
frame.setResizable(false);
frame.setVisible(true);
}
}
I have problem with this. The button is taking up the entire JFrame. I've tried changing the dimensions of the JFrame and the JButton but with no changed. It's completely hiding a JTable underneath. Could someone please tell me what I'm doing wrong.
JFrame FRAME = new JFrame();
JButton BUTTON = new JButton("OK");
FRAME.add(new JScrollPane(TableName));
BUTTON.setPreferredSize(new Dimension(20,30));
FRAME.add(BUTTON);
FRAME.setSize(700, 600);
FRAME.setVisible(true);
FRAME.setLocationRelativeTo(null);
The default layout manager for a a JFrame is a BorderLayout. You are attempting to add two component the CENTER which is not allowed. Only the last one added will be displayed.
You need to specify constraints when adding components to a BorderLayout. Your code should be something like:
frame.add(new JScrollPane(TableName), BorderLayout.CENTER);
button.setPreferredSize(new Dimension(20,30));
frame.add(button, BorderLayout.PAGE_START);
Also, variables names should NOT be upper cased. Follow Java convention.
Read the section from the Swing tutorial on How to Use BorderLayout for more information and working examples. The tutorial code will also show you how to better structure your program so you follow Swing coding conventions.
Don't add the button straight to the frame, create a JPanel first, add the button to the panel then add the panel to the frame.
JFrame frame = new JFrame();
// frame.setBounds(x axis, y axis, weight, height)
frame.setBounds(10,10,304,214);
frame.getContentPane().setLayout(null);
JButton button = new JButton("Button");
button.setBounds(98, 75, 126, 39);
frame.getContentPane().add(button);
frame.setVisible(true);
I can't seem to add a JButton to a JPanel.
I have a PropWindow (JFrame) that has a PropView (JPanel) in it. the PropView-JPanel seems to be added correctly because I can draw shapes on it with paint().
But when I use this to try adding a button it just won't show up att all :/
JButton testButton;
public PropView(int width, int height) {
super(true);
setLayout(null);
setSize(width, height);
//TestButton
testButton = new JButton("Test");
testButton.setLocation(10,10);
testButton.setSize(100, 50);
testButton.setVisible(true);
add(testButton);
setFocusable(true);
setVisible(true);
}
The JFrame and the JPanel are both 250x600 px.
I can't tell from the code snippet you posted but just in case: make sure you call pack () on the frame after you have added the panel or any other components.
Also, it's usually discouraged to extend a JPanel or JFrame, unless you have a good reason to do it, just a heads up.
Here you have a short tutorial about displaying frames:
And some sample code in it that might help:
//1. Create the frame.
JFrame frame = new JFrame("FrameDemo");
//2. Optional: What happens when the frame closes?
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//3. Create components and put them in the frame.
//...create emptyLabel...
frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);
//4. Size the frame.
frame.pack();
//5. Show it.
frame.setVisible(true);
Make sure you added PropPanel to PropWindow using myPropWindow.getContentPane().add(myPropPanel), not just myPropWindow.add(myPropPanel).
I just want to make a JFrame that will say "Hello world", nothing big, no interaction needed. How do I do this?
I can create the JFrame, however I do not know how to put a JPanel with simple text in it.
Here is what I got so far
JFrame frame = new JFrame("Relief Valve");
frame.setResizable(false);
frame.setLocation(500,300);
JPanel p1 = new JPanel();
frame.setVisible(true);
Instead of creating the JPanel, try:
JLabel label = new JLabel("this is my text");
frame.add(label);
frame.pack();
JFrame window = new JFrame("Hello World App");
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLayout(new BorderLayout());
window.add(new JLabel("Hello World"), BorderLayout.CENTER);
window.pack();
window.setVisible(true);
window.setLocationRelativeTo(null);
I'm currently on a mobile device but I'll be happy to document that when I get on a computer, feel free to ask any questions though.
You need to create a JLabel (witch is from Swing library) the code for that is:
JLabel label = new JLabel("Hello world");
if u want to set it to a specific loaction you need to create a render method :
public void render(Graphics g){
g.drawString(label,x,y);
}
the x and y is the position of the string with your label.
In order to create a JFrame with a simple text, you have to create a label and attach it to your frame.
Let's assume you have a JFrame created:
JFrame myFrame = new JFrame("My Frame");
Let's create the text label:
JLabel myLabel = new JLabel("Text");
To change a text of already created label:
myLabel.setText("New Text");
And eventually to clear the label:
myLabel.setText("");
Let's connect all the dots:
myFrame.add(myLabel, BorderLayout.CENTER);
myFrame.pack();
To learn more about JFrames, check: https://javatutorial.net/swing-jframe-basics-create-jframe
I am trying to write a retro snake game. I set a background image of an old Nokia, and I want to play the snake from its screen. However, I cannot put my gamepanel on my background image.
Can I do that?
I used this code for my background image.
Thanks.
JFrame frame = new JFrame("Retro Snake");
frame.getContentPane().add(new GamePanel());
try {
frame.setContentPane(new JLabel(new ImageIcon(ImageIO.read(new File("Images\\background.jpg")))));
} catch (IOException e) {
e.printStackTrace();
}
frame.setLocation(500, 100);
frame.pack();
frame.setVisible(true);
Don't add the JPanel to a contentPane that you are only going to discard on the next line or two (as you're currently doing).
Give your new contentPane-JLabel a BorderLayout via setLayout(new BorderLayout())
add the gamepanel to the JLabel above, Borderlayout.CENTER.
Be sure that you make your gamepanel JPanel non-opaque by calling setOpaque(false) on it, so that the background JLabel shows its image.