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5.6

Problem - Refreshing JPanel with BufferedImage Object

Asked by abhishek88 in Java AWT & Swing, Java Programming Language

Tags: Java, Swing, AWT

In my program , i am drawing on bufferedimage object and then i am painting it to jpanel.
It is working fine
But as i want to implement undo/redo functionalities. i want to set or change bufferedimage object by new one (retreived from the vector) to the jpanel. I am getting the object from vector but it is not refreshing the jpanel means new image is not loaded into the jpanel.

Here is the sample code :

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             //This is the class whose object i am storing in the vector
public class StoreBufferedImage implements Serializable {
	private BufferedImage bufferimage;
	private int current_index;
	public StoreBufferedImage(BufferedImage bufferimage, int current_index) {
		super();
		this.bufferimage = bufferimage;
		this.current_index = current_index;
	}
	public BufferedImage getBufferimage() {
		return bufferimage;
	}
	public void setBufferimage(BufferedImage bufferimage) {
		this.bufferimage = bufferimage;
	}
	public int getCurrent_index() {
		return current_index;
	}
	public void setCurrent_index(int current_index) {
		this.current_index = current_index;
	}
	
}
 
 
public class TestPanel extends JPanel
{
      public Vector<StoreBufferedImage> undoredo=new Vector<StoreBufferedImage>();
     private BufferedImage img;
     public BufferedImage getImg() {
		return img;
	}
 
 
 
	public void setImg(BufferedImage img) {
		this.img = img;
		repaint();
	}
 
      public void refreshImage(Graphics g)
	{
		if(img==null)
		{
			int w=getWidth();
	        int h=getHeight();
	        
	        img=new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
	        setImg(img);    
	        
	        Graphics2D gd=img.createGraphics();
	        gd.setPaint(Color.WHITE);
	        gd.fillRect(0, 0, w, h);
	        gd.dispose();
	        
	        
		}
		
		g.drawImage(getImg(), 0, 0, (int)(getImg().getWidth()),(int)(getImg().getHeight()), this);
	}
 
 
	public void paint(Graphics g) {
		super.paint(g);
		refreshImage(g);
		repaint();
	}
       
    public void undoAction()
	{
		StoreBufferedImage sbi=(StoreBufferedImage)undoredo.firstElement();	
	        // i am getting the object properly.
		setImg(sbi.getBufferimage());
		repaint();
		//on repaint new image is not loaded into jpanel
	}
}
 
 
// This is the mouse listener in which i am drawing rectangle in drawbox method (not shown 
// here in which i am simply drawing the rectangle)
 
public class TestMouseListener extends MouseAdapter{
 
	TestPanel tp;
	int count=0;
	public TestMouseListener(TestPanel tp)
	{
		this.tp=tp;
	}
	
	public void mousePressed(MouseEvent e) {		
		super.mousePressed(e);		
		tp.setStartpt(e.getPoint());		
	}
 
	
	public void mouseReleased(MouseEvent e) {	
		tp.setEndpt(e.getPoint());		
		tp.drawBox(false);	
		StoreBufferedImage sbi=new StoreBufferedImage(tp.getImg(),++count);
		tp.undoredo.add(sbi);				
	} 
	
}
 
// I am having undo button in my jframe class (not shown here) . I am calling undoAction method //  of TestPanel to perform undo operation.

           
         

Problem - Refreshing JPanel with BufferedImage Object

Asked by abhishek88 in Java AWT & Swing, Java Programming Language

Tags: Java, Swing, AWT

About this solution