Printing memory and performance optimization

Question

Hello,
I am using JVM 1.3 for a big Java Application.
Print Preview consumes 1.5MB of JVM's memory and performance is slow.
Please give your valuable ways to reduce memory usage and performance improvement
will be appreciated.
/* print method in ScrollablePanel extends JPanel */
     public int print(Graphics g, PageFormat pf, int pi) throws PrinterException
          double pageHeight = 0;
          double pageWidth = 0;
          Graphics2D g2 = (Graphics2D)g;
          pageWidth = pf.getImageableWidth();
          if (pi >= pagecount)
               return Printable.NO_SUCH_PAGE;
          g2.translate(pf.getImageableX(),pf.getImageableY());
// < Print Height manipultion>
          g2.setClip(0,(int)(startHeight[pi]), (int) pageWidth, (int)(endHeight[pi] - startHeight[pi]) );
          g2.scale(scaleX,scaleX);
          this.print(g2);
          g2.dispose();
          System.gc();
          return PAGE_EXISTS;
/* print preview */
private void pagePreview()
BufferedImage img = new BufferedImage(m_wPage, m_hPage, BufferedImage.TYPE_INT_ARGB);
Graphics g = img.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, m_wPage, m_hPage);
target.print(g, pageFormat, pageIndex);
pp = new PagePreview(w, h, img); // pp is JPanel
g.dispose();
img.flush();
m_preview = new PreviewContainer(); //m_preview is JPanel
m_preview.add(pp);
ps = new JScrollPane(m_preview);
getContentPane().add(ps, BorderLayout.CENTER);
Best Regards,
Krish

Answer 1

Good day,
As I tried, there are two ways of doing printPreview.
To handle this problem, add only one page at a time.
To browse through the page use Prev Page, Nexe Page buttons in the toolbar.
1) BufferedImage - occupies memory .
Class PagePreview extends JPanel
public void paint(Graphics g) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
g.drawImage(m_img, 0, 0, this);
paintBorder(g);
This gives better performance, but consumes memory.
2) getPageGraphics in the preview panel . This occupies less memory, but re-paint the graphics everytime when paint(Graphics g) is called.
Class PagePreview extends JPanel
public void paint(Graphics g)
g.setColor(Color.white);
RepaintManager currentManager = RepaintManager.currentManager(this);
currentManager.setDoubleBufferingEnabled(false);
Graphics2D g2 = scrollPanel.getPageGraphics();
currentManager.setDoubleBufferingEnabled(true);
g2.dispose();
This addresses memory problem, but performance is better.
Is there any additional info from you?
Good Luck,
Kind Regards,
Krish