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POproblem in setting scrollpane for canvas
 

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  1. POproblem in setting scrollpane for canvas
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    <p>In the below program I want to zoomin and zoomout the image which is selected by the user.the problem is that when I zoomin or zoomout the image by clicking on zoomin zoomout button then scrollabars are not working. please help what is hte problem</p> <pre> import java.awt.BorderLayout; import java.awt.Canvas; import java.awt.Container; import java.awt.Cursor; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JScrollPane; public class ImageProcess extends JFrame implements ActionListener { private JMenuItem newimage; private JMenuItem open; private Image image; private File file; private JFrame jf; private JPanel panel; private Cursor zoomCursor; public ImageProcess() { super("Image Demo"); this.setBounds(200, 200, 100, 100); this.setSize(800, 800); this.setResizable(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container con = this.getContentPane(); this.setVisible(true); JMenuBar menubar = new JMenuBar(); this.setJMenuBar(menubar); JMenu file = new JMenu("File"); newimage = new JMenuItem("New"); open = new JMenuItem("Open"); menubar.add(file); file.add(newimage); file.addSeparator(); file.add(open); newimage.addActionListener(this); open.addActionListener(this); } public void actionPerformed(ActionEvent e) { if (e.getSource() == newimage) { ReadImage ri = new ReadImage(); } if (e.getSource() == open) { OpenImage oi = new OpenImage(); } } public static void main(String args[]) { ImageProcess imagepro = new ImageProcess(); } } class ImageFileFilter extends javax.swing.filechooser.FileFilter { public boolean accept(File file) { if (file.isDirectory()) return false; String name = file.getName().toLowerCase(); return (name.endsWith(".jpg") || name.endsWith(".png") || name .endsWith(".gif")); } public String getDescription() { return "Images (*.gif,*.bmp, *.jpg, *.png )"; } } class ReadImage extends JFrame { File file; JFileChooser chooser; public ReadImage() { chooser = new JFileChooser(); chooser.setMultiSelectionEnabled(false); chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES); int returnVal = chooser.showOpenDialog(ReadImage.this); if (returnVal == JFileChooser.APPROVE_OPTION) { file = chooser.getSelectedFile(); try { final BufferedImage bi = ImageIO.read(file); Canvas can = new Canvas() { public void paint(Graphics g) { Graphics2D g2d = (Graphics2D) g; g2d.drawImage(bi, 0, 0, this); } }; this.getContentPane().add(can); can.setPreferredSize(new Dimension(bi.getWidth(), bi .getHeight())); this.pack(); this.setVisible(true); } catch (IOException ie) { ie.printStackTrace(); } } } } class OpenImage extends JFrame implements ActionListener { private JFileChooser chooser; private File file; private JFrame jf; Canvas can; JPanel pan; public JScrollPane sp; Dimension imgSize, iniSize; private JButton butIn = new JButton("ZoomIN"); private JButton butOut = new JButton("ZoomOUT"); private JButton butReset = new JButton("Reset"); public OpenImage() { chooser = new JFileChooser(); chooser.setCurrentDirectory(new File(".")); chooser.addChoosableFileFilter(new ImageFileFilter()); int returnVal = chooser.showOpenDialog(null); if (returnVal == JFileChooser.APPROVE_OPTION) { file = chooser.getSelectedFile(); String filename = file.getName(); try { final BufferedImage bi = ImageIO.read(file); imgSize = iniSize = new Dimension(bi.getWidth(), bi.getHeight()); jf = new JFrame(); this.setResizable(false); this.setTitle(filename); pan = new JPanel(); pan.add(butIn); pan.add(butOut); // pan.add(butReset); butIn.addActionListener(this); butOut.addActionListener(this); butReset.addActionListener(this); can = new Canvas() { public void paint(Graphics g) { Graphics2D g2d = (Graphics2D) g; if (imgSize.width = iniSize.width) { can.setSize(imgSize); } can.repaint(); can.validate(); } public void zoomOUT() { if (!(getWidth() > imgSize.width)) { int x = 10 * imgSize.width / 100; int y = 10 * imgSize.height / 100; imgSize = new Dimension(imgSize.width - x, imgSize.height - y); if (getWidth() >= iniSize.width + 50) { can.setSize(imgSize); } can.repaint(); can.validate(); } else { repaint(); } } } </pre>
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    1. USagarwal_achhnera
    1. USagarwal_achhnera
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      1. POproblem in setting scrollpane for canvas
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    1. COreally for deepest debuging :-)
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      1. USmKorbel
    2. COThere is something missing from your code starting line 156
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      1. POproblem in setting scrollpane for canvas
      1. USBernd Elkemann
 

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