PDFBox : PDPageContentStream's append mode mis

问题:

I am drawing an image on one of the PDF page.. when I use PDPageContentStream stream = new PDPageContentStream(doc, page); to draw image, everything works fine.. see below image.

but when I use constructor PDPageContentStream(doc, page, true, true); to create PDPageContentStream and draw image, the newly added image gets inverted upside down..

not getting what's going wrong here..

PS. I am using library PdfBox-Android

回答1:

Use the constructor that has a fifth parameter, so to reset the graphic context.

public PDPageContentStream(PDDocument document, PDPage sourcePage, boolean appendContent, 
                            boolean compress, boolean resetContext) throws IOException

alternatively, save and restore the graphics state in the first content stream by calling

saveGraphicsState();
// ...
restoreGraphicsState();