Develop Reference

How to put an image into jpanel with GridBagLayout()?

Currently, the code is:
JFrame frame = new JFrame("App");
frame.setSize(1200, 800);//Give it a size
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);//Make it go away on close
JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEFT)); //TU ZMIENIAC
frame.add(panel);//Add it to your frame
(...)
JPanel panelForm = new JPanel(new GridBagLayout());
panel.add(panelForm);
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(10,10,10,10);
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.LINE_END;
(...)
panelForm.add(label_pageCount, c);
c.gridy++;
try {
URL url = new URL(JSONLists.thumbnail.get(page));
BufferedImage image = ImageIO.read(url);
JLabel label = new JLabel(new ImageIcon(image));
panelForm.add(label);
} catch (Exception exp) {
exp.printStackTrace();
}
Which results in:
Every Jlabel is put properly in its place on the grid, except the image which appears in top right corner instead of assigned place.

In this part:
try {
URL url = new URL(JSONLists.thumbnail.get(page));
BufferedImage image = ImageIO.read(url);
JLabel label = new JLabel(new ImageIcon(image));
panelForm.add(label); //here
} catch (Exception exp) {
exp.printStackTrace();
}
you add the component to the container without the GridBagConstratints. That's why the component is not being added in the proper location. So, changing it to:
panelForm.add(label,c); //Add with constraints
will fix it.

Cannot render video from BufferedImage using HashMap in Java

In my project, I have got a class FramesUtil which contains a set of frames stored in a HashMap -
ConcurrentHashMap<Integer, Frame> frameMap
I have another class Arbiter.java that should render video using frames from frameMap.
However, I can only see the first frame when the playVideo() method is being called from Arbiter.java.
public static void main(String[] args) {
try {
FramesUtil.ensureExistence();
FrameReader reader = new FrameReader();
reader.readBinary();
playVideo();
} catch (Exception e) {
e.printStackTrace();
}
}
Looks like the JFrame is not getting updated with new BufferedImage in the loop during the iteration
Below is my playVideo method from Arbiter.java -
public static void playVideo() {
BufferedImage img;
JFrame frame = new JFrame();
GridBagLayout gLayout = new GridBagLayout();
frame.getContentPane().setLayout(gLayout);
JLabel lbIm1;
for(int i=0; (img=FramesUtil.frameMap.get(i).bufferedImage)!=null; i++) {
lbIm1 = new JLabel(new ImageIcon(img));
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.CENTER;
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
System.out.println(lbIm1);
frame.getContentPane().add(lbIm1, c);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
PS. I have tried creating new JFrame and GridBagLayout instances inside the for loop

Why isn't the JPanel showing the ImageIcon?

I have a GridBagConstraints gbcImage and a JLabel that is initialized like this:
gbcImage.gridx = 1; // column 0
gbcImage.gridy = 2; // row 2
gbcImage.ipady = 100;
gbcImage.ipadx = 100;
JLabel label = new JLabel("", null, JLabel.CENTER);
label.setOpaque(true);
label.setBackground(Color.WHITE);
panel.add(label, gbcImage);
Where panel is added to a JFrame.
So I implemented a MouseListener to the label:
public void mouseClicked(MouseEvent e) {
JFileChooser jfc = new JFileChooser();
int iRet = jfc.showOpenDialog(panel);
if (iRet == jfc.APPROVE_OPTION)
{
File file = jfc.getSelectedFile();
try
{
BufferedImage bi = ImageIO.read(file);
image = new ImageIcon(bi);
JLabel label = new JLabel("", image, JLabel.CENTER);
panel.add(label, gbcImage);
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
}
But it didn't work. The image doesn't show in the panel at runtime.
What am I missing?

There is no need to create a new JLabel. The problem is you added a new label to the panel but its default size is (0, 0) because you didn't reavalidate() and repaint() the panel.
There is no need to create a new label.
Instead you keep a reference to the original label (like you do for the panel) and then you just replace the icon:
image = new ImageIcon(bi);
label.setIcon( image );

Java layout when using JScrollPane

This is my code
private static KeyEvent e;
private static String text1 = null;
private static String text = null;
public fysikdel() {
super("Fysikformler");
setSize(700, 502);
setDefaultCloseOperation(EXIT_ON_CLOSE);
init();
setResizable(true);
setVisible(true);
}
public void init() {
JPanel main = new JPanel();
JPanel p = new JPanel();
CardLayout c1 = new CardLayout();
JScrollPane scrollpane = new JScrollPane(p);
JPanel Mekanik = new JPanel();
p.setSize(700, 502);
Mekanik.setLayout(new FlowLayout());
//637*237
ImageIcon likformigrorelsei = new ImageIcon();
JLabel likformigrorelsel = new JLabel();
ImageIcon lagesenergii = new ImageIcon();
JLabel lagesenergil = new JLabel();
ImageIcon a = new ImageIcon();
JLabel aa = new JLabel();
ImageIcon b = new ImageIcon();
JLabel bb = new JLabel();
try {
likformigrorelsei = new ImageIcon(new URL("http://i.imgur.com/TZFkXYa.jpg"));
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
likformigrorelsel.setIcon(likformigrorelsei);
try {
lagesenergii = new ImageIcon(new URL("http://i.imgur.com/TZFkXYa.jpg"));
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
lagesenergil.setIcon(lagesenergii);
try {
a = new ImageIcon(new URL("http://i.imgur.com/TZFkXYa.jpg"));
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
aa.setIcon(a);
try {
b = new ImageIcon(new URL("http://i.imgur.com/TZFkXYa.jpg"));
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
bb.setIcon(b);
Mekanik.add(likformigrorelsel);
Mekanik.add(lagesenergil);
Mekanik.add(aa);
Mekanik.add(bb);
JPanel Tryck = new JPanel();
main.setLayout(new GridLayout(1,1));
p.setLayout(c1);
this.add(main);
main.add(scrollpane);
p.add(Mekanik, "1");
p.add(Tryck, "2");
c1.show(p, "1");
When I add more pictures I want them to fill up from left to right untill one row is filled, then fill the next row. At the moment it just continue to fill the first row.
If I add
scrollpane.setHorizontalScrollBarPolicy(HORIZONTAL_SCROLLBAR_NEVER);
it just removes the horizontal scroll bar but the pictures are still ending up on one row.
I dont know what is wrong. Thanks for any help!

So you put all your images in the Mekanik panel, which uses a FlowLayout. As the java tutorial states,
The FlowLayout class puts components in a row, sized at their preferred size
which is obviously not what you want. So you'll have to change the layout used by your panel.
To my mind, the GridLayout would be a better fit for your problem.

New invisible layer in JPanel

I would like to ask for help. I want something like this: http://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html#glasspane
I have this application with map and i want to have a small picture in an new invisible layer. Small picture could move by JSliders up and left. That layer should be only over "label". A have this code:
private JPanel mujPanel5() {
JSlider [] posuvniky = new JSlider[2];
posuvniky[0] = new JSlider(SwingConstants.HORIZONTAL, 0, 100, 30);
posuvniky[1] = new JSlider(SwingConstants.VERTICAL, 0, 100, 60);
for (int i = 0; i < posuvniky.length; i++) {
posuvniky[i].addChangeListener(new ZmenaPosuvniku5()); //Listener do nothing
}
URL umisteniMapy = this.getClass().getResource("map.jpg");
Icon obrazek = new ImageIcon(umisteniMapy);
JLabel label = new JLabel(obrazek, SwingConstants.CENTER);
label.setOpaque(true);
label.setBackground(Color.white);
JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add(posuvniky[0], BorderLayout.NORTH);
panel.add(posuvniky[1], BorderLayout.WEST);
panel.add(label, BorderLayout.CENTER);
return panel;
}
Thanks to everybody.
MmM ...

I do not know how to create described invisible layer
See How to Use Layered Panes.