SWT中打印图片、图像
本文转载自：http://www.blogjava.net/Javawind/articles/129899.html//Send questions, comments, bug reports, etc. to the authors://Rob Warner (rwarner@interspatial.com)//Robert Harris (rbrt_harris@yahoo.com)import org.eclipse.swt.*;import org.eclipse.swt.graphics.*;import org.eclipse.swt.printing.*;import org.eclipse.swt.widgets.*;/** *//** * This class demonstrates printing images */public class ImagePrinterExample {/** *//** * The application entry point * @param args the command line arguments */public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display, SWT.NONE); try { // Prompt the user for an image file FileDialog fileChooser = new FileDialog(shell, SWT.OPEN); String fileName = fileChooser.open(); if (fileName == null) { return; } // Load the image ImageLoader loader = new ImageLoader(); ImageData[] imageData = loader.load(fileName); if (imageData.length > 0) { // Show the Choose Printer dialog PrintDialog dialog = new PrintDialog(shell, SWT.NULL); PrinterData printerData = dialog.open(); if (printerData != null) { // Create the printer object Printer printer = new Printer(printerData); // Calculate the scale factor between the screen resolution and printer // resolution in order to correctly size the image for the printer Point screenDPI = display.getDPI(); Point printerDPI = printer.getDPI(); int scaleFactor = printerDPI.x / screenDPI.x; // Determine the bounds of the entire area of the printer Rectangle trim = printer.computeTrim(0, 0, 0, 0); // Start the print job if (printer.startJob(fileName)) { if (printer.startPage()) { GC gc = new GC(printer); Image printerImage = new Image(printer, imageData); // Draw the image gc.drawImage(printerImage, 0, 0, imageData.width, imageData.height, -trim.x, -trim.y, scaleFactor * imageData.width, scaleFactor * imageData.height); // Clean up printerImage.dispose(); gc.dispose(); printer.endPage(); } } // End the job and dispose the printer printer.endJob(); printer.dispose(); } } } catch (Exception e) { MessageBox messageBox = new MessageBox(shell, SWT.ICON_ERROR); messageBox.setMessage("Error printing test image"); messageBox.open(); }}} 和打印文字不同。因为系统中的dpi(dot per inch)和打印机的dpi不同，所以要进行转换。
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