SearchInLayers.cs
- //
- // This code is part of Document Solutions for PDF demos.
- // Copyright (c) MESCIUS inc. All rights reserved.
- //
-
- using System;
- using System.IO;
- using System.Linq;
- using System.Drawing;
- using System.Collections.Generic;
- using GrapeCity.Documents.Common;
- using GrapeCity.Documents.Pdf;
- using GrapeCity.Documents.Pdf.Layers;
- using GrapeCity.Documents.Pdf.Annotations;
- using GrapeCity.Documents.Pdf.Graphics;
- using GrapeCity.Documents.Text;
- using GrapeCity.Documents.Drawing;
-
- namespace DsPdfWeb.Demos
- {
- // This example shows how to search for text in certain layers only.
- // The input PDF for this sample was created by LangLayers.
- public class SearchInLayers
- {
- public int CreatePDF(Stream stream)
- {
- using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "lang-layers.pdf"));
- var doc = new GcPdfDocument();
- doc.Load(fs);
-
- var regex = "\\b(Windows|macOS|Linux|Mac)\\b";
- // var regex = @"(?=(\W|^))(shoes|shirt|pants)(?!(\W|$))";
- FindInLayer(doc, "English", regex, Color.FromArgb(100, Color.Red));
- FindInLayer(doc, "French", regex, Color.FromArgb(100, Color.Blue));
- FindInLayer(doc, "Russian", regex, Color.FromArgb(100, Color.Green));
-
- // Save the PDF:
- doc.Save(stream);
- return doc.Pages.Count;
- }
-
- static void FindInLayer(GcPdfDocument doc, string layer, string text, Color highlight)
- {
- // Create a view state with just the specified layer visible:
- var viewState = new ViewState(doc);
- viewState.SetLayersUIStateExcept(false, layer);
- viewState.SetLayersUIState(true, layer);
-
- // Create a FindTextParams using our custom view state
- // so that the search is limited to the specified layer only:
- var ftp = new FindTextParams(text, false, false, viewState, 72f, 72f, true, true);
-
- // Find all occurrences of the search text:
- var finds = doc.FindText(ftp, OutputRange.All);
-
- // Highlight all occurrences on the specified layer only:
- foreach (var find in finds)
- foreach (var ql in find.Bounds)
- {
- var g = doc.Pages[find.PageIndex].Graphics;
- g.BeginLayer(layer);
- doc.Pages[find.PageIndex].Graphics.FillPolygon(ql, highlight);
- g.EndLayer();
- }
- }
- }
- }
-