import java.awt.*;
import javax.swing.*;
import java.awt.print.*;

/** A simple utility class that lets you very simply print
 *  an arbitrary component. Just pass the component to the
 *  PrintUtilities.printComponent. The component you want to
 *  print doesn't need a print method and doesn't have to
 *  implement any interface or do anything special at all.
 *  <P>
 *  If you are going to be printing many times, it is marginally more 
 *  efficient to first do the following:
 *  <PRE>
 *    PrintUtilities printHelper = new PrintUtilities(theComponent);
 *  </PRE>
 *  then later do printHelper.print(). But this is a very tiny
 *  difference, so in most cases just do the simpler
 *  PrintUtilities.printComponent(componentToBePrinted).
 *
 *  7/99 Marty Hall, http://www.apl.jhu.edu/~hall/java/
 *  May be freely used or adapted.
 */

public class PrintUtilities implements Printable {
  private Component componentToBePrinted;

  public static void printComponent(Component c) {
    new PrintUtilities(c).print();
  }
  
  public PrintUtilities(Component componentToBePrinted) {
    this.componentToBePrinted = componentToBePrinted;
  }
  
  public void print() {
    PrinterJob printJob = PrinterJob.getPrinterJob();
    printJob.setPrintable(this);
    ((DragBox)componentToBePrinted).printerPage = new Dimension(10,10);
    if (printJob.printDialog())
      try {
        printJob.print();
      } catch(PrinterException pe) {
        System.out.println("Error printing: " + pe);
      }
  }

  public int print(Graphics g, PageFormat pageFormat, int pageIndex) {
    if (pageIndex > 0) {
      return(NO_SUCH_PAGE);
    } else {
      Graphics2D g2d = (Graphics2D)g;
//      g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
      ((DragBox)componentToBePrinted).printerPage = new Dimension((int)pageFormat.getWidth(), (int)pageFormat.getHeight());

      g2d.translate((int)pageFormat.getImageableX(),(int)pageFormat.getImageableY());
                      // scale to fill the page
      double dw = pageFormat.getImageableWidth();
      double dh = pageFormat.getImageableHeight();
      Dimension screenSize = new Dimension((int)pageFormat.getWidth(), (int)pageFormat.getHeight());
      double xScale = dw / screenSize.width;
      double yScale = dh / screenSize.height;
      double scale = Math.min(xScale,yScale);
                      // center the chart on the page
      double tx = 0.0;
      double ty = 0.0;
      if (xScale > scale) {
          tx = 0.5*(xScale-scale)*screenSize.width;
      } else {
          ty = 0.5*(yScale-scale)*screenSize.height;
      }
      ((Graphics2D)g2d).translate(tx, ty);
      ((Graphics2D)g2d).scale(scale, scale);
      Dimension bounds = new Dimension((int)dw,(int)dh);

      disableDoubleBuffering(componentToBePrinted);
      componentToBePrinted.paint(g2d);
      enableDoubleBuffering(componentToBePrinted);

      return(PAGE_EXISTS);
    }
  }

  /** The speed and quality of printing suffers dramatically if
   *  any of the containers have double buffering turned on.
   *  So this turns if off globally.
   *  @see enableDoubleBuffering
   */
  public static void disableDoubleBuffering(Component c) {
    RepaintManager currentManager = RepaintManager.currentManager(c);
    currentManager.setDoubleBufferingEnabled(false);
  }

  /** Re-enables double buffering globally. */
  
  public static void enableDoubleBuffering(Component c) {
    RepaintManager currentManager = RepaintManager.currentManager(c);
    currentManager.setDoubleBufferingEnabled(true);
  }
}