Abder-Rahman Ali

I'm following all the answers, and I really don't know what is the issue posting on all forums.

I don't think that I should comply with things that actually don't make sense.

Is there a problem asking more than one person on different forums? If you can help, I would appreciate it, if you cannot, you shouldn't write things beyond the subject.

I really wish to see something related to Java here...

Think BIGGER.

Thank you so much for your reply.

I got what you mean and they are really valuable.

But, can you just give me a hint on how to work in your last point?

So you need data structures that store all shapes to be drawn - those data structures would be populated in the events handlers, and then used in the paintComponent method. At the end of the event handler, you would call the repaint() method to tell Swing that it needs to repaint the window.

Thanks.

I have the following code shown below, which will be able to draw a shape once clicking on a button. For example, if you press the "Draw Rectangle" button a rectangle should be drawn and so forth.

I have reached to the point where to determine the button pressed, but UNABLE to add the drawing functionality after that. How can I draw a shape after pressing a button?

import java.awt.BorderLayout; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class DisposeShapes extends Thread { JLabel label = new JLabel(); JButton addRectangle; JButton addSquare; JButton addCircle; Rectangle rectangle; Graphics2D g2; JPanel panel; public void paint(Graphics g) { g2 = (Graphics2D)g; rectangle = new Rectangle(100,100,100,100); } public DisposeShapes() { JFrame frame = new JFrame("Dispose shapes"); panel = new JPanel(); addRectangle = new JButton("Add Rectangle"); addRectangle.setSize(50, 100); addRectangle.addActionListener(new ButtonListener()); addSquare = new JButton("Add Square"); addSquare.setSize(50,100); addSquare.addActionListener(new ButtonListener()); addCircle = new JButton("Add Circle"); addCircle.setSize(50,100); addCircle.addActionListener(new ButtonListener()); panel.setLayout(new FlowLayout()); panel.add(addRectangle); panel.add(addSquare); panel.add(addCircle); panel.add(label); frame.getContentPane().add(panel); frame.setVisible(true); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500, 500); } public class ButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { if(e.getSource() == addRectangle) { } else if (e.getSource() == addSquare) { } else if(e.getSource() == addCircle) { } } } public static void main(String[] args) { DisposeShapes disposeShapes = new DisposeShapes(); } }

Thanks.

Thanks Rob, you are absolutely right.

I have this code which is a JFrame with a JPanel and three buttons.

When I run the program it just closes AUTOMATICALLY. Why is that?

import java.awt.BorderLayout; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; public class DisposeShapes { JLabel label = new JLabel("Add Rectangle"); public void DisposeShapes() { JFrame frame = new JFrame("Dispose shapes"); JPanel panel = new JPanel(); JButton addRectangle = new JButton("Add Rectangle"); addRectangle.setSize(50, 100); addRectangle.addMouseListener(new MouseListener()); JButton addSquare = new JButton("Add Square"); addSquare.setSize(50,100); JButton addCircle = new JButton("Add circle"); addCircle.setSize(50,100); frame.getContentPane().add(panel); panel.add(BorderLayout.NORTH, addRectangle); panel.add(BorderLayout.NORTH, addSquare); panel.add(BorderLayout.NORTH, addCircle); frame.setVisible(true); frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(500, 500); } public class MouseListener extends MouseAdapter { public void mouseClicked(MouseEvent me) { String str = label.getText(); if(str.equals("Add Rectangle")) { System.out.println("You pressed the " + " Add Rectangle " + "button"); } } } public static void main(String[] args) { DisposeShapes disposeShapes = new DisposeShapes(); } }

Thanks.

Sebastian Janisch wrote:The length in bytes

Thats what the API says ...
http://java.sun.com/javase/6/docs/api/java/io/File.html#length()

Thanks Sebastian.

So, is it counting the bytes in a file then?

If I do the following for example:

File f = new File(fileName); int fLength = (int)f.length();

What does the number returned by fLength represent? In other words, what is it counting in the file? If I have an image, what is it counting here for example?

Thanks.

Michael Dunn wrote:where do you add the picturePanel?

don't use paint() with swing components - use paintComponent()

Yes, exactly, this is the case.

How do I add the "PicturePanel" to my GUI? This is the the problem I'm facing.

Thanks.

Hello,

I have created a GUI with the menus "File" and "Help".

"File" has a menu item, "Open Image...".

I'm just having an issue DISPLAYING an image at the GUI.

I have my "Open Image..." menu item as follows:

openImageMenuItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { fileChooser = new JFileChooser(); int sts = fileChooser.showOpenDialog(AbdMedImgEditor.this); if(sts == fileChooser.APPROVE_OPTION) { File selectedFile = fileChooser.getSelectedFile(); picturePanel = new PicturePanel(selectedFile.getAbsolutePath()); } } } );

And, the code that is responsible for displaying the image is:


public class PicturePanel extends JPanel { private ImageIcon picture; PicturePanel(String fileName) { picture = new ImageIcon(fileName); } public void paint(Graphics g) { super.paint(g); g.drawImage(picture.getImage(),0,0,this); } }

And, finally the code that displays the creates and shows the GUI is as follows:

public static void createShowGUI() { JFrame frame = new JFrame("Img Editor"); AbdMedImgEditor abdEditor = new AbdMedImgEditor(); frame.setJMenuBar(abdEditor.createMenuBar()); frame.setSize(500, 500); frame.setVisible(true); }


Thanks.

Ulf Dittmer wrote:I was hoping you'd point us to a source; there are several possible interpretations of the term, but none that is commonly used.

It is actually a thing a Professor I'm working with requested and told me that it is used for historical reasons that have small header and footer, but didn't ask him yet since I didn't start yet but wondered if anyone heard of that term.

Thanks.

Ulf Dittmer wrote:That's not a term that's commonly used; where did you encounter it?

A research I'm doing. Required to read such types of images.

I just want to ask the followingL

1- What is a byte image?
2- Why do we use such images?

Thanks.

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twitter.com/abderrahmanali

David Newton wrote:Isn't it just a library?

It actually contains many files, but noticed that I have to download them in a specific way determined here: http://download.java.net/media/jai-imageio/builds/release/1.1/INSTALL-jai_imageio.html and now just getting problems in changing permission for the JDK at my MAC OS X machine.

Thanks.

How can I add JAI (Java Advanced Imaging) to the Eclipse IDE?

Thanks.

Thank you so much.