Getting Position and Size of TextFragment in PDF Documents

Environment

Version	Product	Author
2024.3.806	RadPdfProcessing	Desislava Yordanova

Description

Determining the precise location and size of a TextFragment in a PDF document is essential for various document processing tasks. A TextFragment's position is accessible through its Position property, which returns a MatrixPosition. This article outlines how to translate the MatrixPosition into (x,y) coordinates and how to calculate the width and height of a TextFragment.

This KB article also answers the following questions:

• How can I find the exact location of a text in a PDF document?
• What is the method to determine the dimensions of a text segment within a PDF file?
• How to use the MatrixPosition for locating text in a PDF document?

Solution

To obtain the (x,y) coordinates and the dimensions (width and height) of a TextFragment, follow these steps:

1. Extract the (x,y) Coordinates:

   Each TextFragment has a Position property of type MatrixPosition. The MatrixPosition object includes a Matrix that exposes OffsetX and OffsetY properties. These properties represent the fragment's offset from the top-left corner of the PDF page.

   float offsetX = textFragment.Position.Matrix.OffsetX;
   float offsetY = textFragment.Position.Matrix.OffsetY;
   

2. Calculate the Size (Width and Height):

   To determine the width and height of a TextFragment, leverage the measuring functionality of the Block object. First, insert the TextFragment into a Block, and then use the Measure method to find its size.

   private static Size GetFragmentSize(TextFragment textFragment)
   {
      Block block = new Block();
      block.Insert(textFragment);
      Size textFragmentSize = block.Measure();
      return textFragmentSize;
   }
   

By following these steps, you can accurately locate a TextFragment within a PDF document and determine its size, enabling enhanced document processing and manipulation capabilities.

Notes

• The OffsetX and OffsetY values pinpoint the location relative to the top-left corner of the PDF page.
• The Measure method of the Block object provides the width and height of the contained TextFragment, facilitating precise layout and positioning operations.

See Also

• Position Concept in RadPdfProcessing
• TextFragment in RadPdfProcessing
• Extracting Text Within a Specific Rectangle in PDF Documents