Description Alex Boyko 2010-05-18 10:01:30 EDT

Try the following snippet:

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.printing.*;

public class TestSnippet {

	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.open();
		PrinterData data = Printer.getDefaultPrinterData();
		if (data == null) {
			System.out.println("Warning: No default printer.");
			display.dispose();
			return;
		}
		Printer printer = new Printer(data);
		if (printer.startJob("SWT Printing Snippet")) {
			Color black = printer.getSystemColor(SWT.COLOR_BLACK);
			Color white = printer.getSystemColor(SWT.COLOR_WHITE);
			Rectangle trim = printer.computeTrim(0, 0, 0, 0);
			Point dpi = printer.getDPI();
			int leftMargin = dpi.x + trim.x; // one inch from left side of paper
			if (leftMargin < 0)
				leftMargin = -trim.x; // make sure to print on theprintable area
			int topMargin = dpi.y / 2 + trim.y; // one-half inch from top edge
												// of paper
			if (topMargin < 0)
				topMargin = -trim.y; // make sure to print on the printable area
			GC gc = new GC(printer);
			if (printer.startPage()) {
				gc.setBackground(white);
				gc.setForeground(black);
				float scale = Math.round((float) printer.getDPI().x
						/ display.getDPI().x);
				int size = Math.round(scale * 50);
				int offset = Math.round(scale * 5);
				gc.setClipping(leftMargin, topMargin, size, size);
				gc.drawRectangle(leftMargin, topMargin, size, size);
				gc.setClipping(leftMargin + size + offset, topMargin, size,
						size);
				gc.drawRectangle(leftMargin + size + offset, topMargin, size,
						size);
				printer.endPage();
			}
			gc.dispose();
			printer.endJob();
		}
		printer.dispose();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}

Note that only one rectangle is printed, namely the second one. If the 2nd setClipping(int,int,int,int) call is removed and the first includes the area for both rectangles then it would work I think.
On Win XP it prints both rectangles.

Problem noticed in Draw2D PrintExample. Figures are usually drawn as follows:
1) Clip rectangle == bounds of the figure
2) paint the figure
Appears that only the last figure gets drawn everything else is wiped out for the GC built from Printer device. Works fine if the GC is built from the Display device.