adding components to frame

Hi ,

I found an application for my project on the net and want to tweak it in that i want to add an image and a graph to a frame. But what is happening currently is that whenever i add image the graph disappears. How do i use the layout manager for frames in java.

Code:

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import java.awt.*;
import java.awt.Rectangle;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.*;

public class SquareGrid extends JPanel {
    SquareRx[][] squares;
    final int PAD = 20;
    final int ROWS = 5;
    final int COLS = 7;
    BufferedImage image;

    public SquareGrid() {
        addMouseListener(ml);
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        if(squares == null) {
            initSquares();
        }
        // Draw squares.
        g2.setPaint(Color.blue);
        for(int i = 0; i < ROWS; i++) {
            for(int j = 0; j < COLS; j++) {
                squares[i][j].draw(g2);
            }
        }
    }

    private void initSquares() {
        squares = new SquareRx[ROWS][COLS];
        int w = getWidth();
        int h = getHeight();
        double xInc = (double)(w - 2*PAD)/COLS;
        double yInc = (double)(h - 2*PAD)/ROWS;
        for(int i = 0; i < ROWS; i++) {
            double y = PAD + i*yInc;
            for(int j = 0; j < COLS; j++) {
                double x = PAD + j*xInc;
                Rectangle2D.Double r =
                    new Rectangle2D.Double(x, y, xInc, yInc);
                squares[i][j] = new SquareRx(i, j, r);
            }
        }
    }

    private MouseListener ml = new MouseAdapter() {
        public void mousePressed(MouseEvent e) {
            Point p = e.getPoint();
            if(!isInGrid(p)) return;
            double xInc = (double)(getWidth() - 2*PAD)/COLS;
            double yInc = (double)(getHeight() - 2*PAD)/ROWS;
            int row = (int)((p.y-PAD)/yInc);
            int col = (int)((p.x-PAD)/xInc);
            System.out.println(squares[row][col]);
            boolean isSelected = squares[row][col].isSelected();
            squares[row][col].setSelected(!isSelected);
            repaint();
        }
    };

    private boolean isInGrid(Point p) {
        Rectangle r = getBounds();
        r.grow(-PAD, -PAD);
        return r.contains(p);
    }
   
    public void ShowImage() {
        try {
      String imageName="C:/Documents and Settings/ROHAN/Desktop/RG.jpg";
      File input = new File(imageName);
          image = ImageIO.read(input);
        } catch (IOException ie) {
          System.out.println("Error:"+ie.getMessage());
        }
      }


    public static void main(String[] args) {
        SquareGrid test = new SquareGrid();
        JFrame f = new JFrame("RoboGuard RoutePlanner");
        Panel panel = new ShowImage();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test);
        //f.getContentPane().add(panel);
        f.setSize(400,400);
        f.setLocation(100,100);
        f.setVisible(true);
        test.addComponentListener(test.cl);
    }

    private ComponentListener cl = new ComponentAdapter() {
        public void componentResized(ComponentEvent e) {
            squares = null;
            repaint();
        }
    };
}

class SquareRx {
    private final int row;
    private final int col;
    Rectangle2D.Double rect;
    Color color = new Color(140,200,160);
    Color bgColor = Color.orange;
    Color selColor = Color.red;
    private boolean selected = false;

    public SquareRx(int r, int c, Rectangle2D.Double rect) {
        row = r;
        col = c;
        this.rect = rect;
    }

    public void draw(Graphics2D g2) {
        g2.setPaint(selected ? selColor : bgColor);
        g2.fill(rect);
        g2.setPaint(color);
        g2.draw(rect);
    }

    public void setSelected(boolean selected) {
        this.selected = selected;
    }

    public boolean isSelected() { return selected; }

    public String toString() {
        return "SQUARE[row:" + row + ", col:" + col +
                    ", selected:" + selected + "]";
    }
}

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Quote:

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Originally Posted by roaan

How do i use the layout manager for frames in java.

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Please have a look here: How to use Layout Managers

edit: the current code as posted does not compile for us, so it is hard to test.

Oh i think its because it needs an image location when you try to compile at the point

String imageName="C:/Documents and Settings/ROHAN/Desktop/alien.jpeg";

No, one reason is because you don't post the code for the ShowImage class which appears to extend Panel (which suggests you are doing something else bad -- mixing AWT and Swing components).

Also, please be upfront when cross-posting the same question in multiple fora. Many can get upset if they put time and effort trying to answer a question here (all as volunteers mind you) only to find that the same answer has been given hours ago in a cross-post. Please help prevent that from happening by providing links to all of your cross-posts. Thanks.

Okay this is the original code. It just displays a grid. I want to add an image to it as well. The layout should be such that the grid is at top and image below it.

Also posted at:
forums.sun.com/thread.jspa?threadID=5395747&tstart=0

Code:

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import java.awt.*;
import java.awt.Rectangle;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.*;

public class SquareGrid extends JPanel {
    SquareRx[][] squares;
    final int PAD = 10;
    final int ROWS = 5;
    final int COLS = 7;
    BufferedImage image;

    public SquareGrid() {
        addMouseListener(ml);
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        if(squares == null) {
            initSquares();
        }
        // Draw squares.
        g2.setPaint(Color.blue);
        for(int i = 0; i < ROWS; i++) {
            for(int j = 0; j < COLS; j++) {
                squares[i][j].draw(g2);
            }
        }
    }

    private void initSquares() {
        squares = new SquareRx[ROWS][COLS];
        int w = getWidth();
        int h = getHeight();
        double xInc = (double)(w - 2*PAD)/COLS;
        double yInc = (double)(h - 2*PAD)/ROWS;
        for(int i = 0; i < ROWS; i++) {
            double y = PAD + i*yInc;
            for(int j = 0; j < COLS; j++) {
                double x = PAD + j*xInc;
                Rectangle2D.Double r =
                    new Rectangle2D.Double(x, y, xInc, yInc);
                squares[i][j] = new SquareRx(i, j, r);
            }
        }
    }

    private MouseListener ml = new MouseAdapter() {
        public void mousePressed(MouseEvent e) {
            Point p = e.getPoint();
            if(!isInGrid(p)) return;
            double xInc = (double)(getWidth() - 2*PAD)/COLS;
            double yInc = (double)(getHeight() - 2*PAD)/ROWS;
            int row = (int)((p.y-PAD)/yInc);
            int col = (int)((p.x-PAD)/xInc);
            System.out.println(squares[row][col]);
            boolean isSelected = squares[row][col].isSelected();
            squares[row][col].setSelected(!isSelected);
            repaint();
        }
    };

    private boolean isInGrid(Point p) {
        Rectangle r = getBounds();
        r.grow(-PAD, -PAD);
        return r.contains(p);
    }
   

    public static void main(String[] args) {
        SquareGrid test = new SquareGrid();
        JFrame f = new JFrame("RoboGuard RoutePlanner");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test);
        f.setSize(400,400);
        f.setLocation(100,100);
        f.setVisible(true);
        test.addComponentListener(test.cl);
    }

    private ComponentListener cl = new ComponentAdapter() {
        public void componentResized(ComponentEvent e) {
            squares = null;
            repaint();
        }
    };
}

class SquareRx {
    private final int row;
    private final int col;
    Rectangle2D.Double rect;
    Color color = new Color(140,200,160);
    Color bgColor = Color.black;
    Color selColor = Color.red;
    private boolean selected = false;

    public SquareRx(int r, int c, Rectangle2D.Double rect) {
        row = r;
        col = c;
        this.rect = rect;
    }

    public void draw(Graphics2D g2) {
        g2.setPaint(selected ? selColor : bgColor);
        g2.fill(rect);
        g2.setPaint(color);
        g2.draw(rect);
    }

    public void setSelected(boolean selected) {
        this.selected = selected;
    }

    public boolean isSelected() { return selected; }

    public String toString() {
        return "SQUARE[row:" + row + ", col:" + col +
                    ", selected:" + selected + "]";
    }
}

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