- //
- // This code is part of Document Solutions for PDF demos.
- // Copyright (c) MESCIUS inc. All rights reserved.
- //
- using System;
- using System.IO;
- using System.Drawing;
- using GrapeCity.Documents.Pdf;
- using GrapeCity.Documents.Text;
- using GrapeCity.Documents.Pdf.Annotations;
- using System.Collections.Generic;
- using GrapeCity.Documents.Common;
- namespace DsPdfWeb.Demos
- {
- // This example shows how to find all occurrences of two words in a PDF document and
- // underline those occurrences using the text markup underline annotation.
- // This example is similar to FindAndUnderline, but here we create one text markup
- // annotation per page, adding all occurrences of the words to highlight to it,
- // rather than adding a separate annotation for each occurrence.
- public class MarkupPerPage
- {
- public int CreatePDF(Stream stream)
- {
- // Load the PDF:
- var doc = new GcPdfDocument();
- using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "The-Rich-History-of-JavaScript.pdf"));
- doc.Load(fs);
- // Find all occurrences of "JavaScript" or "ECMAScript" using regex:
- var ft = new FindTextParams("JavaScript|ECMAScript", wholeWord: false, matchCase: false, regex: true);
- var found = doc.FindText(ft, null);
- // Add a text markup annotation per page (keys are page indices):
- Dictionary<int, Tuple<TextMarkupAnnotation, List<Quadrilateral>>> markups = new Dictionary<int, Tuple<TextMarkupAnnotation, List<Quadrilateral>>>();
- foreach (var f in found)
- {
- if (!markups.TryGetValue(f.PageIndex, out var markup))
- {
- markup = new Tuple<TextMarkupAnnotation, List<Quadrilateral>>(
- new TextMarkupAnnotation()
- {
- Page = doc.Pages[f.PageIndex],
- MarkupType = TextMarkupType.Highlight,
- Color = Color.Chartreuse
- },
- new List<Quadrilateral>());
- markups[f.PageIndex] = markup;
- }
- foreach (var b in f.Bounds)
- markup.Item2.Add(b);
- }
- foreach (var v in markups.Values)
- v.Item1.Area = v.Item2;
- // Done:
- doc.Save(stream);
- return doc.Pages.Count;
- }
- }
- }