add ExtractTextBlocks

capzlog-ExtractDataFromPDF/ExtractText.cs

@@ -0,0 +1,32 @@
+using UglyToad.PdfPig;
+using UglyToad.PdfPig.DocumentLayoutAnalysis;
+using UglyToad.PdfPig.DocumentLayoutAnalysis.PageSegmenter;
+using UglyToad.PdfPig.DocumentLayoutAnalysis.ReadingOrderDetector;
+using UglyToad.PdfPig.DocumentLayoutAnalysis.WordExtractor;
+
+namespace capzlog_ExtractDataFromPDF;
+
+public class ExtractText
+{
+    public IEnumerable<TextBlock> ExtractTextBlocks(PdfDocument document, int pageNumber)
+    {
+        if (pageNumber < 1 || pageNumber > document.NumberOfPages)
+        {
+            throw new ArgumentOutOfRangeException(nameof(pageNumber), "Page number is out of range.");
+        }
+        
+        var page = document.GetPage(pageNumber);
+
+        var letters = page.Letters;
+        var wordExtractor = NearestNeighbourWordExtractor.Instance;
+
+        var words = wordExtractor.GetWords(letters);
+                
+        var pageSegmenter = DocstrumBoundingBoxes.Instance;
+
+        var textBlocks = pageSegmenter.GetBlocks(words);
+                
+        var readingOrder = UnsupervisedReadingOrderDetector.Instance;
+        return readingOrder.Get(textBlocks);
+    }
+}