// 完毕:
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;
}
}
}