使图像适合打印区域

您需要按比例缩小图像以适合可用区域。

private int currentPage = -1;private Image cachedScaledImage = null;public double getScaleFactor(int iMasterSize, int iTargetSize) {    double dScale = 1;    if (iMasterSize > iTargetSize) {        dScale = (double) iTargetSize / (double) iMasterSize;    } else {        dScale = (double) iTargetSize / (double) iMasterSize;    }    return dScale;}public double getScaleFactorToFit(BufferedImage img, Dimension size) {    double dScale = 1;    if (img != null) {        int imageWidth = img.getWidth();        int imageHeight = img.getHeight();        dScale = getScaleFactorToFit(new Dimension(imageWidth, imageHeight), size);    }    return dScale;}public double getScaleFactorToFit(Dimension original, Dimension toFit) {    double dScale = 1d;    if (original != null && toFit != null) {        double dScaleWidth = getScaleFactor(original.width, toFit.width);        double dScaleHeight = getScaleFactor(original.height, toFit.height);        dScale = Math.min(dScaleHeight, dScaleWidth);    }    return dScale;}public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {    if (pageIndex >= images.size()) {        return Printable.NO_SUCH_PAGE;    }    RenderedImage image;    Graphics2D graphics2D = (Graphics2D) graphics;    int width = (int)Math.round(pageFormat.getImageableWidth());    int height = (int)Math.round(pageFormat.getImageableHeight());    if (currentPage != pageIndex || cachedScaledImage == null) {        currentPage = pageIndx;        image = new NullOpImage((RenderedImage) images.get(pageIndex), null, null, OpImage.OP_IO_BOUND);        BufferedImage imageCopy = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB);        Graphics2D g2d = imageCopy.createGraphics();        g2d.drawImage(imageCopy, 0, 0, null);        g2d.dispose();        double scaleFactor = getScaleFactorToFit(new Dimension(image.getWidth(), image.getHeight()), new Dimension(width, height));        int imageWidth = (int)Math.round(image.getWidth() * scaleFactor);        int imageHeight = (int)Math.round(image.getHeight() * scaleFactor);        double x = ((pageFormat.getImageableWidth() - imageWidth) / 2) + pageFormat.getImageableX();        double y = ((pageFormat.getImageableHeight() - imageHeight) / 2) + pageFormat.getImageableY();        cachedScaledImage = imageCopy.getScaledInstance(imageWidth, imageHeight, Image.SCALE_SMOOTH);    }    graphics2D.drawRenderedImage(cachedScaledImage, AffineTransform.getTranslateInstance(x, y));    return PAGE_EXISTS;}