Thus, in this answer a base PdfCanvasEditor class has been developed on top of the text extraction framework. The text extraction framework in iText already contains code to follow the graphics state.
to properly recognize the text drawn by a text showing operation one needs to know the current font to map the character codes to Unicode characters. When editing PDF content streams it is helpful to know the current graphics state at each instruction, e.g. Based on your example files I assume it to be approximately the start of the base line of the text to rotate. This is a generalization of your case.įurthermore, you did not mention the center of rotation. To keep the code in the answer simple, therefore, I can assume the text to rotate is drawn in a consecutive sequence of text showing instructions in a text object in the page content stream framed by instructions that are not text showing ones. In that example I saw that the text to rotate was drawn using a single text showing instruction which is the only such instruction in the encompassing text object in the page content stream. You did not explain what kind of text pieces you want to rotate but offered a representative example PDF. You also mention you are looking for a solution using itext or pdfbox and used the tags itext, pdfbox, and itext7. The process of guessing which graphics might be related to the text and, therefore, probably should be rotated along, is a topic in its own right.
Slightly rotate pdf page how to#
First of all, in your question you only talk about how to rotate a specific text but in your example you additionally rotate a red rectangle.
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