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Place one-inch margins on the page

If you need centimeters instead of inches, multiply each inch value by 2.54 to get the number of centimeters. import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.printing.PrintDialog; import org.eclipse.swt.printing.Printer; import org.eclipse.swt.printing.PrinterData; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class MainClass {   public static void main(String[] args) {     Display display = new Display();     Shell shell = new Shell(display);     PrintDialog dlg = new PrintDialog(shell);     dlg.setScope(PrinterData.SELECTION);     PrinterData printerData = dlg.open();     if (printerData != null) {       Printer printer = new Printer(printerData);       System.out.println(printer.getClientArea());       Point dpi = printer.getDPI(); // Get the DPI       Rectangle rect = printer.getClientArea(); // Get the printable area       Rectangle trim = printer.computeTrim(0, 0, 0, 0); // Get the whole page       int left = trim.x + dpi.x; // Set left margin one inch from left side of paper       int top = trim.y + dpi.y; // Set top margin       int right = (rect.width + trim.x + trim.width) - dpi.x; // 1st three                                                               // values give       // you the right side of the page       int bottom = (rect.height + trim.y + trim.height) - dpi.y; // Set bottom                                                                   // margin       // use left, top, right, and bottom as the boundaries that govern where       // you draw on the page.       printer.dispose();     }     while (!shell.isDisposed()) {       if (!display.readAndDispatch()) {         display.sleep();       }     }     display.dispose();   } }