//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System;using System.IO;using System.Drawing;using GrapeCity.Documents.Pdf;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;        }    }}