//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using System.Linq;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Pdf.TextMap;using GrapeCity.Documents.Pdf.Annotations;using System.Collections.Generic;using GrapeCity.Documents.Common;
namespace DsPdfWeb.Demos{    // This example shows how to strikeout a paragraph starting with a certain phrase    // ("Several species") using the text markup strikeout annotation.    public class StrikeoutParagraph    {        public int CreatePDF(Stream stream)        {            // Load the PDF:            var doc = new GcPdfDocument();            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "Wetlands.pdf"));            doc.Load(fs);
            // Strikeout the first paragraph that starts with the words "Several species":            ITextParagraph para = null;            foreach (var p in doc.Pages)            {                var paras = p.GetTextMap().Paragraphs;                para = paras.FirstOrDefault(p_ => p_.GetText().StartsWith("Several species"));                if (para != null)                    break;            }            if (para == null)                return doc.Pages.Count; // Should not happen.
            // Text markup strikeout annotation:            var markup = new TextMarkupAnnotation()            {                Page = para.Page,                MarkupType = TextMarkupType.StrikeOut,                Color = Color.Red            };
            // Get the coordinates of all text run fragments in the paragraph,            // and add them to the annotation's area:            List<Quadrilateral> area = new List<Quadrilateral>();            foreach (var run in para.Runs)            {                foreach (var frag in run)                {                    // Note: in v6.0.3 a method ITextRunFragment.GetBounds() was added,                    // so this code can be replaced with a single 'frag.GetBounds()' call.                    // Find the text run fragment's index in the containing line:                    int index = 0;                    var line = frag.Line;                    var frags = line.RunFragments;                    for (int i = 0; i < frags.Count && frags[i] != frag; ++i)                        index += frags[i].Count;                    // Add the fragment's bounds (quadrilateral) to the annotation area:                    area.Add(frag.Line.GetCoords(index, frag.Count));                }            }            markup.Area = area;
            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}