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POhow to change Jslider value and pass to paintComponent?
 

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  1. POhow to change Jslider value and pass to paintComponent?
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    <p>i am developing an application in which Brightness of image change as per user change the value of JSlider. Jslider display on window but image is not loaded and i also don't know how to pass value of JSlider to paintComponent() method.</p> <p>my code :</p> <pre><code>public class Neo_2010_Slider1 extends JFrame { private static final long serialVersionUID = 1L; private Container container ; private JSlider slider1 ; private JLabel lbl1 ; private JPanel panel1 ; private JTextField txt1 ; public Neo_2010_Slider1() { super("Slider"); setAlwaysOnTop(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBackground(new Color(14555)); setSize(new Dimension(400,400)); setResizable(true); container = getContentPane(); BorderLayout containerLayout = new BorderLayout(); container.setLayout(containerLayout); lbl1 = new JLabel("Slider 1"); /****************** TextField Properties ********************************/ txt1 = new JTextField(4); slider1 = new JSlider(JSlider.HORIZONTAL,0,1000,0);//direction , min , max , current slider1.setFont(new Font("Tahoma",Font.BOLD,12)); slider1.setMajorTickSpacing(100); slider1.setMinorTickSpacing(25); slider1.setPaintLabels(true); slider1.setPaintTicks(true); slider1.setPaintTrack(true); slider1.setAutoscrolls(true); slider1.setPreferredSize(new Dimension(500,500)); slider1.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { txt1.setText(String.valueOf(slider1.getValue())); repaint(); } }); txt1.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { try { slider1.setValue(Integer.parseInt(txt1.getText())); } catch(Exception ex) { txt1.setText("ERROR"); txt1.setToolTipText("Set Value in Range between 0 - 1000 ") ; } } }); this.addFocusListener(new FocusListener() { @Override public void focusLost(FocusEvent e){ } @Override public void focusGained(FocusEvent e) { txt1.setText(String.valueOf(slider1.getValue())); } }); panel1 = new JPanel(); container.add(panel1, BorderLayout.WEST); panel1.add(lbl1); panel1.add(txt1); panel1.add(slider1); setVisible(true); } public void paintComponent(Graphics g){ Graphics2D g2d=(Graphics2D)g; try{ BufferedImage src=ImageIO.read(new File("src.jpg")); BufferedImage dest=changeBrightness(src,0.5f); g2d.drawImage(dest,0,0,this); ImageIO.write(dest,"jpeg",new File("dest.jpg")); }catch(Exception e){ e.printStackTrace(); } } public BufferedImage changeBrightness(BufferedImage src,float val){ RescaleOp brighterOp = new RescaleOp(val, 0, null); return brighterOp.filter(src,null); //filtering } public static void main(String args[]) { new Neo_2010_Slider1(); } } </code></pre> <p>i also don't know that where to pass paintComponent method.. if anyone knows then please guide me.</p>
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