英文:
Pdfbox : Draw image in rotated page
问题
我有一个简单的A4 PDF文档，其中有一个属性 /Rotate 90 ：我的原始PDF版本是横向的，但打印时是纵向的。
我正在尝试在纵向文档的左下方绘制一个小图像。
以下是我目前的代码：
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"));}
以下是最终结果：正如您所看到的，图像被放置在左上角（这是旋转之前的 0,0 坐标），并且没有进行旋转。
我尝试使用 drawImage(PDImageXObject image, Matrix matrix) 进行操作，但没有成功。
以下是原始文档 pdf with 90° rotation。
英文:
I have a simple A4 pdf document with a property /Rotate 90 : The original version of my pdf is landscape but printed portrait.
I am trying to draw a small image at the bottom left of the portait document.
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"));}
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.
I tried playing with drawImage(PDImageXObject image, Matrix matrix) without success.
Here is the orignal document pdf with 90° rotation
答案1
得分: 5
这是一个针对页面旋转90度的解决方案：
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/恢复图形状态。
旋转270度的页面解决方案：
cs.transform(Matrix.getRotateInstance(Math.toRadians(270), 0, page.getCropBox().getHeight() + page.getCropBox().getLowerLeftY()));
对于180度的情况：
cs.transform(Matrix.getRotateInstance(Math.toRadians(180), page.getCropBox().getWidth() + page.getCropBox().getLowerLeftX(), page.getCropBox().getHeight() + page.getCropBox().getLowerLeftY()));
英文:
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();
If it is only the image, then you don't need the save/restore.
Solution for a page that is rotated 270°:
cs.transform(Matrix.getRotateInstance(Math.toRadians(270), 0, page.getCropBox().getHeight() + page.getCropBox().getLowerLeftY()));
For 180°:
cs.transform(Matrix.getRotateInstance(Math.toRadians(180), page.getCropBox().getWidth() + page.getCropBox().getLowerLeftX(), page.getCropBox().getHeight() + page.getCropBox().getLowerLeftY()));
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