Pdfbox:在旋转的页面中绘制图像 [英] Pdfbox : Draw image in rotated page
问题描述
我有一个简单的A4 pdf文档,其属性为 / Rotate 90
:我的pdf的原始版本为横向但打印为纵向。
I have a simple A4 pdf document with a property /Rotate 90
: The original version of my pdf is landscape but printed portrait.
我正在尝试在portait文档的左下方绘制一个小图像。
I am trying to draw a small image at the bottom left of the portait document.
到目前为止,这是我的代码:
Here is my code so far :
File file = new File("rotated90.pdf");
try (final PDDocument doc = PDDocument.load(file)) {
PDPage page = doc.getPage(0);
PDImageXObject image = PDImageXObject.createFromFile("image.jpg", doc);
PDPageContentStream contents = new PDPageContentStream(doc, page, PDPageContentStream.AppendMode.APPEND, false, true);
contents.drawImage(image, 0, 0);
contents.close();
doc.save(new File("newpdf.pdf"));
}
这是最终结果:如您所见,图像位于左上方(是旋转之前的0,0坐标),并且没有旋转。
Here is the end result : As you can see the image was placed at the top left (which was the 0,0 coordinate before rotation) and was not rotated.
我尝试过与 drawImage(PDImageXObject图像,矩阵矩阵)
没有成功。
以下是原始文档 pdf旋转90°
推荐答案
以下是将页面旋转90°的解决方案:
Here's a solution for a page that is rotated 90°:
PDPageContentStream cs = new PDPageContentStream(doc, page, PDPageContentStream.AppendMode.APPEND, true, true);
PDImageXObject image = ....
cs.saveGraphicsState();
cs.transform(Matrix.getRotateInstance(Math.toRadians(90), page.getCropBox().getWidth() + page.getCropBox().getLowerLeftX(), 0));
cs.drawImage(image, 0, 0);
cs.restoreGraphicsState();
cs.close();
如果只是图像,则不需要保存/恢复。
If it is only the image, then you don't need the save/restore.
将页面旋转270°的解决方案:
Solution for a page that is rotated 270°:
cs.transform(Matrix.getRotateInstance(Math.toRadians(270), 0, page.getCropBox().getHeight() + page.getCropBox().getLowerLeftY()));
对于180°:
cs.transform(Matrix.getRotateInstance(Math.toRadians(180), page.getCropBox().getWidth() + page.getCropBox().getLowerLeftX(), page.getCropBox().getHeight() + page.getCropBox().getLowerLeftY()));
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