// 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.Pdf.TextMap;
using GrapeCity.Documents.Common;
namespace DsPdfWeb.Demos
{
// This example shows how to find all occurrences of two words in a PDF document and
// highlight each of those words with different color using text markup highlight annotations.
// Points of interest in this code:
// - We use separate FindText() calls for each word. To speed up the searches,
// for each page we cache the text map and reuse it in the two FindText() calls.
// While the performance improvement is minor in the case of two words, it would
// be significant if the task were to find multiple words (e.g. when building a word index,
// as illustrated in the WordIndex example which uses a similar approach.
// - In order to highlight each of the two words using a different color,
// on each page we create one highlight markup annotation per word.
public class MarkupPerWord
{
public int CreatePDF(Stream stream)
{
const string word0 = "JavaScript";
const string word1 = "framework";
// Load the PDF:
var doc = new GcPdfDocument();
using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "CompleteJavaScriptBook.pdf"));
doc.Load(fs);
// A FindTextParams for each of the search words:
var ft0 = new FindTextParams(word0, wholeWord: false, matchCase: false, regex: false);
var ft1 = new FindTextParams(word1, wholeWord: false, matchCase: false, regex: false);
// Find and highlight words on the pages, caching and reusing the text map
// of each page for the two searches:
foreach (var p in doc.Pages)
{
// Find and highlight the first word:
var textMap = p.GetTextMap();
TextMarkupAnnotation markup0 = null;
List<Quadrilateral> area0 = null;
textMap.FindText(ft0, fp_ => {
markup0 ??= new TextMarkupAnnotation()
{
Subject = word0,
Page = doc.Pages[fp_.PageIndex],
MarkupType = TextMarkupType.Highlight,
Color = Color.Cyan
};
area0 ??= new List<Quadrilateral>();
foreach (var b in fp_.Bounds)
area0.Add(b);
});
if (markup0 != null)
markup0.Area = area0;
// Find and highlight the second word:
TextMarkupAnnotation markup1 = null;
List<Quadrilateral> area1 = null;
textMap.FindText(ft1, fp_ => {
markup1 ??= new TextMarkupAnnotation()
{
Subject = word1,
Page = doc.Pages[fp_.PageIndex],
MarkupType = TextMarkupType.Highlight,
Color = Color.Fuchsia
};
area1 ??= new List<Quadrilateral>();
foreach (var b in fp_.Bounds)
area1.Add(b);
});
if (markup1 != null)
markup1.Area = area1;
}
// Done:
doc.Save(stream);
return doc.Pages.Count;
}
}
}