ImagePrinterExample.java Source code

Introduction

Here is the source code for ImagePrinterExample.java

Source

//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[0]);

                            // Draw the image
                            gc.drawImage(printerImage, 0, 0, imageData[0].width, imageData[0].height, -trim.x,
                                    -trim.y, scaleFactor * imageData[0].width, scaleFactor * imageData[0].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();
        }
    }
}