itext - itextpdf pdfcontentbyte addtemplate的参数是什么意思

Question

我正在使用 itextpdf 将一些 pdf 合并为一个。
itextpdf pdfcontentbyte addtemplate的参数是什么意思，没有文档描述。

Answer 1

下面的代码成功了，感谢帮助我的人。

        FileInputStream pdfInput = new FileInputStream(pdf);
        PdfReader pdfReader = new PdfReader(pdfInput);
        for (int index = 1; index <= pdfReader.getNumberOfPages(); index++) {
            main.newPage();
            PdfImportedPage page = pdfWriter.getImportedPage(pdfReader,
                index);
            Rectangle pagesize = pdfReader.getPageSizeWithRotation(index);
            float oWidth = pagesize.getWidth();
            float oHeight = pagesize.getHeight();
            float scale = getScale(oWidth, oHeight);
            float scaledWidth = oWidth * scale;
            float scaledHeight = oHeight * scale;
            int rotation = pagesize.getRotation();

            AffineTransform transform = new AffineTransform(scale, 0, 0, scale, 0, 0);
            switch (rotation) {
                case 0:
                    cb.addTemplate(page, transform);
                    break;
                case 90:
                    AffineTransform rotate90 = new AffineTransform(0, -1f, 1f, 0, 0, scaledHeight);
                    rotate90.concatenate(transform);
                    cb.addTemplate(page, rotate90);
                    break;
                case 180:
                    AffineTransform rotate180 = new AffineTransform(-1f, 0, 0, -1f, scaledWidth,
                        scaledHeight);
                    rotate180.concatenate(transform);
                    cb.addTemplate(page, rotate180);
                    break;
                case 270:
                    AffineTransform rotate270 = new AffineTransform(0, 1f, -1f, 0, scaledWidth, 0);
                    rotate270.concatenate(transform);
                    cb.addTemplate(page, rotate270);
                    break;
                default:
                    cb.addTemplate(page, scale, 0, 0, scale, 0, 0);
            }
        }

private static float getScale(float width, float height) {
    float scaleX = PageSize.A4.getWidth() / width;
    float scaleY = PageSize.A4.getHeight() / height;
    return Math.min(scaleX, scaleY);
}