Merge pull request #240 from SyncfusionExamples/1005534

1005534 : how to find specific text using the PDF library, redact it, and then draw an image at the same location.

Author: chinnumuniyappan

Text Extraction/Redact-Text-and-Replace-It-with-an-Image-in-a-PDF/.NET/Redact-Text-and-Replace-It-with-an-Image-in-a-PDF.slnx

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+<Solution>
+  <Project Path="Redact-Text-and-Replace-It-with-an-Image-in-a-PDF/Redact-Text-and-Replace-It-with-an-Image-in-a-PDF.csproj" />
+</Solution>

Text Extraction/Redact-Text-and-Replace-It-with-an-Image-in-a-PDF/.NET/Redact-Text-and-Replace-It-with-an-Image-in-a-PDF/Data/Image.jpg

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+using Syncfusion.Drawing;
+using Syncfusion.Pdf;
+using Syncfusion.Pdf.Graphics;
+using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Redaction;
+
+// Open the image once; reuse for all redactions.
+using FileStream imageStream = new FileStream(Path.GetFullPath(@"Data/Image.jpg"), FileMode.Open, FileAccess.Read);
+PdfBitmap image = new PdfBitmap(imageStream);
+
+// Load the source PDF.
+using (PdfLoadedDocument document = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
+{
+    // Find all bounds of the search text across pages.
+    Dictionary<int, List<RectangleF>> hits;
+    document.FindText("Fusce", out hits);
+    // For each page with matches
+    foreach (KeyValuePair<int, List<RectangleF>> kvp in hits)
+    {
+        int pageIndex = kvp.Key;
+        PdfLoadedPage page = document.Pages[pageIndex] as PdfLoadedPage;
+        // Replace each matched region by drawing the image in a redaction appearance.
+        foreach (RectangleF match in kvp.Value)
+        {
+            float pad = 1f; // Small padding around the text box.
+            RectangleF box = new RectangleF(
+                match.X - pad,
+                match.Y - pad,
+                match.Width + pad * 2,
+                match.Height + pad * 2
+            );
+            // Create a transparent redaction over the text area.
+            PdfRedaction redaction = new PdfRedaction(box, Color.Transparent);
+            // Draw the image to fully cover the redaction area (stretched to fit).
+            RectangleF dest = new RectangleF(0, 0, box.Width, box.Height);
+            redaction.Appearance.Graphics.DrawImage(image, dest);
+            // Add the redaction to the page.
+            page.AddRedaction(redaction);
+        }
+    }
+    // Apply all redactions so the text is removed and image overlays are finalized.
+    document.Redact();
+    // Save the result.
+    document.Save(Path.GetFullPath(@"Output/Output.pdf"));
+}

Text Extraction/Redact-Text-and-Replace-It-with-an-Image-in-a-PDF/.NET/Redact-Text-and-Replace-It-with-an-Image-in-a-PDF/Data/Input.pdf

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Redact_Text_and_Replace_It_with_an_Image_in_a_PDF</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Pdf.Imaging.Net.Core" Version="*" />
+  </ItemGroup>
+
+</Project>