使用iText平铺，并添加边距 [英] Tiling with iText, and adding margins

问题描述

我正在关注Tiling Hero示例（ http://itextpdf.com/examples/iia .php？id = 116 ）但我希望能够为每个页面添加页边距。

Im following the Tiling Hero example (http://itextpdf.com/examples/iia.php?id=116) but I'd like to be able to add margins to each page.

推荐答案

请查看 TileClipped 示例。它基于 TilingHero 示例，但它有一个转折点：

Please take a look at the TileClipped example. It is based on the TilingHero example, but it has a twist:

public void manipulatePdf(String src, String dest)
    throws IOException, DocumentException {
    float margin = 30;
    // Creating a reader
    PdfReader reader = new PdfReader(src);
    Rectangle rect = reader.getPageSizeWithRotation(1);
    Rectangle pagesize = new Rectangle(rect.getWidth() + margin * 2, rect.getHeight() + margin * 2);
    // step 1
    Document document = new Document(pagesize);
    // step 2
    PdfWriter writer
        = PdfWriter.getInstance(document, new FileOutputStream(dest));
    // step 3
    document.open();
    // step 4
    PdfContentByte content = writer.getDirectContent();
    PdfImportedPage page = writer.getImportedPage(reader, 1);
    // adding the same page 16 times with a different offset
    float x, y;
    for (int i = 0; i < 16; i++) {
        x = -rect.getWidth() * (i % 4) + margin;
        y = rect.getHeight() * (i / 4 - 3) + margin;
        content.rectangle(margin, margin, rect.getWidth(), rect.getHeight());
        content.clip();
        content.newPath();
        content.addTemplate(page, 4, 0, 0, 4, x, y);
        document.newPage();
    }
    // step 4
    document.close();
    reader.close();
}

您是否看到我们如何区分 rect 和 pagesize ？我们将 rect 定义为原始页面的大小，我们将 pagesize 定义为稍大的大小（取决于 margin 的值。

Do you see how we make a distinction between rect and pagesize? We define rect as the size of the original pages and we define pagesize as a size that is slightly bigger (depending on the value of margin).

我们在定义偏移时使用rect x 和 y ，但我们添加 margin 来稍微改变该偏移量。我们更改了偏移量，因为我们剪切了 pagesize 。通过定义剪切路径来完成剪辑：

We use rect when we define the offset x and y, but we add margin to slightly change that offset. We change the offset because we clip the pagesize. Clipping is done by defining a clipping path:

content.rectangle(margin, margin, rect.getWidth(), rect.getHeight());
content.clip();
content.newPath();

这三行之后添加的所有内容都将被我们在 rectangle（）方法。如果您还想添加其他内容，可能需要添加额外的 saveState（） / restoreState（）方法如果需要在剪切路径之外添加内容。

Everything added after these three lines will be clipped by the rectangle we define in the rectangle() method. You may want to add extra saveState()/restoreState() methods if you also want to add other content, especially if that content needs to be added outside the clipping path.

这篇关于使用iText平铺，并添加边距的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！