无边距打印

Question

我正在尝试编写一个照相亭程序，但我很难进行无边框打印。我非常接近，但图像无法填满 4" x 6" 的印刷品。我将不胜感激有关实现无边框打印的任何提示。

干杯！

    final BufferedImage img = ImageIO.read(new File(image));

    // Assuming that images are going to be 300 DPI
    PrinterResolution pr = new PrinterResolution(300, 300,
        PrinterResolution.DPI);

    PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();
    pras.add(pr);

    // Set print job so the image name shows (in the print queue)
    this.pj.setJobName(new File(image).getName());

    PageFormat pf = this.pj.getPageFormat(null);
    Paper paper = pf.getPaper();
    paper.setSize(4 * 72, 6 * 72);
    paper.setImageableArea(
        0.0, 0.0,
        paper.getWidth(), paper.getHeight()
    );

    if(img.getWidth(null) > img.getHeight(null))
        pf.setOrientation(PageFormat.LANDSCAPE);
    else
        pf.setOrientation(PageFormat.PORTRAIT);

    pf.setPaper(paper);

    // Create the page
    this.pj.setPrintable(new Printable() {
        public int print(Graphics g, PageFormat pf, int i) throws 
            PrinterException {
            if (i != 0)
                return NO_SUCH_PAGE;

            double width = img.getWidth(null);
            double height = img.getHeight(null);

            double w = Math.floor(pf.getImageableWidth() - 
                pf.getImageableX()) / (width * 1.0);

            double h = Math.floor(pf.getImageableHeight() - 
                pf.getImageableY()) / (height * 1.0);

            double scale = Math.min(w, h);

            Graphics2D g2 = (Graphics2D) g;
            g2.translate(0, 0);
            g2.scale(scale, scale);
            g2.drawImage(img, 0, 0, (int)width, (int)height, null);

            return PAGE_EXISTS;
        }
    }, this.pj.validatePage(pf));

    // Get number of copies
    int nCopies = SetPrintQuantity.getPrintQuantity(new File(image));

    // Print
    if(nCopies != 0)
        for(int i = 0; i < nCopies; i++)
            this.pj.print(pras);

    System.out.println(nCopies + ((nCopies == 1) ? " copy" : " copies"));

this.pj = PrinterJob

Answer 1

我已经和同样的问题作斗争有一段时间了。 这是我的解决方案：

确定打印机的实际页面尺寸：

final PrinterJob printJob = PrinterJob.getPrinterJob();
printJob.setPrintService(ps);
final PageFormat pf = printJob.defaultPage();
System.out.println("Printer Page width=" + pf.getWidth() + " height=" + pf.getHeight());

对于我的 HiTi P720L 照片打印机，使用 4"x6" 纸张，实际上是 4.133"x6.147"。

创建并设置一个具有完整页面大小和完整可成像区域的新 Paper 对象：

final Paper paper = new Paper();
paper.setSize(pageWidth * 72.0f, pageHeight * 72.0f);
paper.setImageableArea(0.0, 0.0, paper.getWidth(), paper.getHeight());
pf.setPaper(paper);

最后一个技巧，绘制到范围之外的 x/y 坐标。 就我而言，我必须将 x 坐标缩放 10%，并将 x 坐标平移 -55（将其置于负 x 值）。

printJob.setPrintable(new Printable() {
public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
    Graphics2D g2 = (Graphics2D) graphics;
    final double xScale = 1.1;
    final double xTranslate = -55;
    final double yScale = 1;
    final double yTranslate = 0;
    final double widthScale = (pageFormat.getWidth() / image.getWidth()) * xScale;
    final double heightScale = (pageFormat.getHeight() / image.getHeight()) * yScale;
    System.out.println("Setting scale to " + widthScale + "x" + heightScale);
    final AffineTransform at = AffineTransform.getScaleInstance(widthScale, heightScale);
    System.out.println("Setting translate to " + xTranslate + "x" + yTranslate);
    at.translate(xTranslate, yTranslate);
    if (pageIndex != 0) {
        return NO_SUCH_PAGE;
    }
    g2.drawRenderedImage(image, at);
    return PAGE_EXISTS;
}
}, pf);

Answer 2

只是在这里添加我的发现。

摆脱边框问题的技巧是将图形上的剪辑设置为空：

Graphics2D g2d = (Graphics2D) graphics;
g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
g2d.setClip(null);