Modifying an image

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.Ellipse2D;

import java.awt.image.BufferedImage;

import java.io.*;

import java.util.Hashtable;

import javax.imageio.ImageIO;

import javax.swing.*;

import javax.swing.event.*;

public class StringOverImage extends JPanel implements ChangeListener

{

BufferedImage image;

Dimension size;

Font font;

String text;

boolean showText;

int x;

int y;

public StringOverImage(BufferedImage image)

{

this.image = image;

size = new Dimension(image.getWidth(), image.getHeight());

font = getFont().deriveFont(18f);

showText = false;

}

public void stateChanged(ChangeEvent e)

{

JSlider slider = (JSlider)e.getSource();

String name = slider.getName();

if(name.equals("x"))

x = slider.getValue();

else if(name.equals("y"))

y = slider.getValue();

repaint();

}

protected void paintComponent(Graphics g)

{

super.paintComponent(g);

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

Point origin = getImageOrigin();

g2.drawImage(image, origin.x, origin.y, this);

g2.setPaint(Color.red);

float sx = origin.x + x;

float sy = origin.y + y;

if(showText)

{

g2.setFont(font);

g2.drawString(text, sx, sy);

}

else // show text origin

g2.fill(new Ellipse2D.Double(sx-2, sy-2, 4, 4));

}

private Point getImageOrigin()

{

Point p = new Point();

p.x = (getWidth() - size.width)/2;

p.y = (getHeight() - size.height)/2;

return p;

}

public Dimension getPreferredSize()

{

return size;

}

public static void main(String[] args) throws IOException

{

BufferedImage bi = ImageIO.read(new File("images/cougar.jpg"));

StringOverImage test = new StringOverImage(bi);

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(new JScrollPane(test));

f.getContentPane().add(test.getUIPanel(), "South");

f.setSize(400,400);

f.setLocation(200,200);

f.setVisible(true);

}

private void save()

{

int w = image.getWidth();

int h = image.getHeight();

BufferedImage save = new BufferedImage(w, h, image.getType());

Graphics2D g2 = save.createGraphics();

Point p = getImageOrigin();

g2.translate(-p.x, -p.y);

paint(g2);

g2.dispose();

try

{

ImageIO.write(save, "png", new File("stringOverImage.png"));

}

catch(IOException ioe)

{

System.err.println("write error: " + ioe.getMessage());

}

}

private JPanel getUIPanel()

{

JPanel panel = new JPanel(new GridBagLayout());

GridBagConstraints gbc = new GridBagConstraints();

gbc.weightx = 1.0;

gbc.insets = new Insets(2,0,2,0);

gbc.fill = GridBagConstraints.HORIZONTAL;

gbc.gridwidth = GridBagConstraints.REMAINDER;

panel.add(getSliders(), gbc);

panel.add(getEditor(), gbc);

return panel;

}

private JPanel getSliders()

{

JSlider xSlider = getSlider(image.getWidth(), "x");

JSlider ySlider = getSlider(image.getHeight(), "y");

// instantiate member variables

x = xSlider.getValue();

y = ySlider.getValue();

JPanel panel = new JPanel(new GridBagLayout());

GridBagConstraints gbc = new GridBagConstraints();

gbc.weightx = 1.0;

gbc.fill = GridBagConstraints.HORIZONTAL;

panel.add(xSlider, gbc);

panel.add(ySlider, gbc);

return panel;

}

private JSlider getSlider(int max, String s)

{

JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, max, max/2);

slider.setName(s);

slider.setPaintLabels(true);

slider.setLabelTable(getLabels(max, s));

slider.addChangeListener(this);

return slider;

}

private Hashtable getLabels(int n, String s)

{

// generic declaration for j2se 1.5+

//Hashtable<Integer,JComponent> ht = new Hashtable<Integer,JComponent>();

Hashtable ht = new Hashtable(); // non-generic for j2se 1.4-

ht.put(new Integer(0), new JLabel("0"));

int w = getFontMetrics(font).stringWidth(s);

ht.put(new Integer((n-w)/2), new JLabel(s));

ht.put(new Integer(n), new JLabel(String.valueOf(n)));

return ht;

}

private JPanel getEditor()

{

final JTextField editor = new JTextField(8);

final JCheckBox show = new JCheckBox("show");

final JButton save = new JButton("save");

show.setActionCommand("show text");

save.setActionCommand("save");

ActionListener l = new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String ac = e.getActionCommand();

if(ac.equals("show text"))

{

text = editor.getText();

showText = show.isSelected();

repaint();

}

else if(ac.equals("save"))

save();

}

};

show.addActionListener(l);

save.addActionListener(l);

JPanel panel = new JPanel(new GridBagLayout());

GridBagConstraints gbc = new GridBagConstraints();

gbc.insets = new Insets(1,1,1,1);

gbc.weightx = 1.0;

gbc.fill = GridBagConstraints.HORIZONTAL;

panel.add(editor, gbc);

gbc.weightx = 0.10;

gbc.fill = GridBagConstraints.NONE;

panel.add(show, gbc);

panel.add(save, gbc);

return panel;

}

}

74philipa at 2007-7-14 0:48:27 >