Jpanel 페인트 할 때 크기 조정

Question

아래 코드에서 스케일링 작업을 수행하고 있습니다. 형태의 두 슬라이더는 스케일링 아핀 변환을위한 X 및 Y 매개 변수입니다. 여기 내가 묻는 것은 이미지가 스케일링되는 슬라이더를 변경할 때,이 이미지가 그려지는 jpanel의 크기를 동적으로 조정하는 방법입니다.

/* 
    * To change this template, choose Tools | Templates 
    * and open the template in the editor. 
    */ 
    package newpackage; 

    import java.awt.Graphics; 
    import java.awt.Image; 
    import java.awt.geom.AffineTransform; 
    import java.awt.image.AffineTransformOp; 
    import java.awt.image.BufferedImage; 
    import java.io.File; 
    import java.io.IOException; 
    import java.util.logging.Level; 
    import java.util.logging.Logger; 
    import javax.imageio.ImageIO; 

    /** 
    * 
    * @author ABC 
    */ 
    public class Swon extends javax.swing.JFrame { 

     final BufferedImage img; 
     /** 
     * Creates new form Swon 
     */ 
     public Swon() throws IOException{ 
      BufferedImage im=ImageIO.read(new File("C:/Users/ABC/Desktop/I-RIX2012_Final_logo_out.jpg")); 
      this.img=new BufferedImage(im.getWidth(),im.getWidth(),BufferedImage.TYPE_BYTE_GRAY); 
      this.img.getGraphics().drawImage(im, 0, 0, null); 
      initComponents(); 
     } 

     /** 
     * This method is called from within the constructor to initialize the form. 
     * WARNING: Do NOT modify this code. The content of this method is always 
     * regenerated by the Form Editor. 
     */ 
     @SuppressWarnings("unchecked") 
     // <editor-fold defaultstate="collapsed" desc="Generated Code"> 
     private void initComponents() { 

      jPanel1 = new javax.swing.JPanel(){ 

       // @Override 

       // public void paint(Graphics g) 
       // { 
        //  super.paint(g); 
        //  g.drawImage(img.getScaledInstance(this.getWidth(), this.getHeight(), Image.SCALE_FAST),0,0,null); 
        // } 

      }; 
      jSlider1 = new javax.swing.JSlider(); 
      jSlider2 = new javax.swing.JSlider(); 

      setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

      jPanel1.setBorder(new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED)); 
      jPanel1.addComponentListener(new java.awt.event.ComponentAdapter() { 
       public void componentResized(java.awt.event.ComponentEvent evt) { 
        jPanel1ComponentResized(evt); 
       } 
      }); 

      javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); 
      jPanel1.setLayout(jPanel1Layout); 
      jPanel1Layout.setHorizontalGroup(
       jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGap(0, 268, Short.MAX_VALUE) 
      ); 
      jPanel1Layout.setVerticalGroup(
       jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGap(0, 209, Short.MAX_VALUE) 
      ); 

      jSlider1.setMaximum(5); 
      jSlider1.setValue(1); 
      jSlider1.addChangeListener(new javax.swing.event.ChangeListener() { 
       public void stateChanged(javax.swing.event.ChangeEvent evt) { 
        jSlider1StateChanged(evt); 
       } 
      }); 

      jSlider2.setMaximum(5); 
      jSlider2.setValue(1); 
      jSlider2.addChangeListener(new javax.swing.event.ChangeListener() { 
       public void stateChanged(javax.swing.event.ChangeEvent evt) { 
        jSlider2StateChanged(evt); 
       } 
      }); 

      javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
      getContentPane().setLayout(layout); 
      layout.setHorizontalGroup(
       layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
        .addGap(45, 45, 45) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
         .addComponent(jSlider2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(jSlider1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
        .addContainerGap(242, Short.MAX_VALUE)) 
      ); 
      layout.setVerticalGroup(
       layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
        .addGap(36, 36, 36) 
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
        .addGap(33, 33, 33) 
        .addComponent(jSlider1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) 
        .addComponent(jSlider2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addContainerGap(38, Short.MAX_VALUE)) 
      ); 

      pack(); 
     }// </editor-fold> 

     private void jPanel1ComponentResized(java.awt.event.ComponentEvent evt) { 
      // TODO add your handling code here: 
      // AffineTransform f=new AffineTransform(); 

     } 

     private void jSlider1StateChanged(javax.swing.event.ChangeEvent evt) { 
      // TODO add your handling code here: 

         AffineTransform scale = AffineTransform.getScaleInstance(jSlider1.getValue(),jSlider2.getValue());  
        AffineTransformOp op3 = new AffineTransformOp(scale, AffineTransformOp.TYPE_BILINEAR); 
        BufferedImage scaling = new BufferedImage(this.img.getHeight(), this.img.getWidth(), this.img.getType()); 
        BufferedImage img1=op3.filter(this.img, scaling); 
        jPanel1.getGraphics().drawImage(img1.getScaledInstance(jPanel1.getWidth(), jPanel1.getHeight(), Image.SCALE_FAST), 0, 0, null); 
     } 

     private void jSlider2StateChanged(javax.swing.event.ChangeEvent evt) { 
      // TODO add your handling code here: 
      AffineTransform scale = AffineTransform.getScaleInstance(jSlider1.getValue(),jSlider2.getValue());  
        AffineTransformOp op3 = new AffineTransformOp(scale, AffineTransformOp.TYPE_BILINEAR); 
        BufferedImage scaling = new BufferedImage(this.img.getHeight(), this.img.getWidth(), this.img.getType()); 
        BufferedImage img1=op3.filter(this.img, scaling); 
        jPanel1.getGraphics().drawImage(img1.getScaledInstance(jPanel1.getWidth(), jPanel1.getHeight(), Image.SCALE_FAST), 0, 0, null); 
     } 

     /** 
     * @param args the command line arguments 
     */ 
     public static void main(String args[]) { 
      /* Set the Nimbus look and feel */ 
      //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
      /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
      * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
      */ 
      try { 
       for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
        if ("Nimbus".equals(info.getName())) { 
         javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
         break; 
        } 
       } 
      } catch (ClassNotFoundException ex) { 
       java.util.logging.Logger.getLogger(Swon.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
      } catch (InstantiationException ex) { 
       java.util.logging.Logger.getLogger(Swon.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
      } catch (IllegalAccessException ex) { 
       java.util.logging.Logger.getLogger(Swon.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
      } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
       java.util.logging.Logger.getLogger(Swon.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
      } 
      //</editor-fold> 

      /* Create and display the form */ 
      java.awt.EventQueue.invokeLater(new Runnable() { 
       public void run() { 
        try { 
         new Swon().setVisible(true); 
        } catch (IOException ex) { 
         Logger.getLogger(Swon.class.getName()).log(Level.SEVERE, null, ex); 
        } 
       } 
      }); 
     } 
     // Variables declaration - do not modify 
     public javax.swing.JPanel jPanel1; 
     private javax.swing.JSlider jSlider1; 
     private javax.swing.JSlider jSlider2; 
     // End of variables declaration 
    } 

Answer 1

좋아, 첫째, 패널이 다시 그릴 this.img.getGraphics().drawImage(im, 0, 0, null)을하지 않는, 이미지가 업데이트되지 않습니다. JComponent (JPanel을 선호)의 paintComponent 메서드를 재정의하고 적절한 비율로 이미지를 다시 칠할 필요가 있습니다.

두 번째로 이미지 패널을 실제로 패널 크기를 염두에 둘 수있는 레이아웃 (예 : GridBagLayout)에 배치해야합니다. 이렇게하려면

... getPreferredSize 방법을 무시하고 조정 된 이미지의 크기를 반환

public class ResizableImagePane { 

    public static void main(String[] args) { 
     new ResizableImagePane(); 
    } 

    public ResizableImagePane() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException ex) { 
       } catch (InstantiationException ex) { 
       } catch (IllegalAccessException ex) { 
       } catch (UnsupportedLookAndFeelException ex) { 
       } 

       JFrame frame = new JFrame(); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       frame.setLayout(new BorderLayout()); 
       frame.add(new ScalerPane()); 
       frame.pack(); 
       frame.setLocationRelativeTo(null); 
       frame.setVisible(true); 
      } 
     }); 
    } 

    protected class ScalerPane extends JPanel { 
     private JSlider slider; 
     private ImagePane imagePane; 
     public ScalerPane() { 

      setLayout(new GridBagLayout()); 
      GridBagConstraints gbc = new GridBagConstraints(); 

      gbc.gridx = 0; 
      gbc.gridy = 0; 

      imagePane = new ImagePane(); 

      add(imagePane, gbc); 

      gbc.gridy = 1; 
      gbc.weightx = 0; 
      gbc.weighty = 0; 
      gbc.fill = GridBagConstraints.HORIZONTAL; 

      slider = new JSlider(); 
      slider.setMinimum(1); 
      slider.setMaximum(100); 
      gbc.weightx = 1; 
      gbc.weighty = 1; 
      gbc.anchor = GridBagConstraints.SOUTH; 
      gbc.fill = GridBagConstraints.HORIZONTAL; 
      add(slider, gbc); 

      slider.addChangeListener(new ChangeListener() { 
       @Override 
       public void stateChanged(ChangeEvent ce) { 
        imagePane.setZoom(slider.getValue()/100f); 
       } 
      }); 
      slider.setValue(100); 
     } 
    } 

    protected class ImagePane extends JPanel { 
     private BufferedImage background; 
     private Image scaled; 
     private float zoom; 
     public ImagePane() { 
      try { 
       background = ImageIO.read(new File("path/to/your/image")); 
      } catch (IOException ex) { 
       ex.printStackTrace(); 
      } 

      setZoom(1f); 
      setBorder(new LineBorder(Color.RED)); 
     } 

     @Override 
     public Dimension getPreferredSize() { 
      return new Dimension(scaled.getWidth(this), scaled.getHeight(this)); 
     } 

     public void setZoom(float zoom) { 
      this.zoom = zoom; 
      int width = Math.round(background.getWidth() * zoom); 
      scaled = background.getScaledInstance(width, -1, Image.SCALE_SMOOTH); 

      invalidate(); 
      revalidate(); 
      repaint(); 
     } 

     public float getZoom() { 
      return zoom; 
     } 

     @Override 
     protected void paintComponent(Graphics grphcs) { 
      super.paintComponent(grphcs); 

      int x = (getWidth() - scaled.getWidth(this))/2; 
      int y = (getHeight() - scaled.getHeight(this))/2; 

      grphcs.drawImage(scaled, x, y, this); 
     } 
    } 
}