//
// 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 System.Numerics;
using System.Collections.Generic;
using System.Linq;
using GrapeCity.Documents.Text;
using GrapeCity.Documents.Drawing;
using GrapeCity.Documents.Pdf;
using GrapeCity.Documents.Pdf.Annotations;
using GrapeCity.Documents.Pdf.Graphics;
using GrapeCity.Documents.Pdf.TextMap;
namespace DsPdfWeb.Demos
{
// This sample shows how to use the text map for a page in a PDF
// to find geometric positions of text lines on the page,
// and to locate the text at a specific position.
// The PDF used in this sample was created by TimeSheet.
public class TextMap
{
public int CreatePDF(Stream stream)
{
var doc = new GcPdfDocument();
var page = doc.NewPage();
var rc = Common.Util.AddNote(
"This sample loads the PDF created by the TimeSheet sample into a temporary GcPdfDocument, " +
"gets the text map for the first page, and prints out the coordinates and texts of all " +
"line fragments in the map. " +
"It also uses the map's HitTest method to find the text at specific coordinates in the PDF " +
"and prints the result. " +
"The original TimeSheet.pdf used by this sample (consisting of 1 page) is appended for reference.",
page);
// Setup text formatting and layout:
var tf = new TextFormat()
{
Font = StandardFonts.Times,
FontSize = 13
};
var tfFound = new TextFormat()
{
Font = StandardFonts.TimesBold,
FontSize = 14,
ForeColor = Color.DarkBlue
};
var tl = new TextLayout(72)
{
MaxWidth = doc.PageSize.Width,
MaxHeight = doc.PageSize.Height,
MarginAll = rc.Left,
MarginTop = rc.Bottom + 36,
TabStops = new List<TabStop>() { new TabStop(72 * 2) },
};
var to = new TextSplitOptions(tl)
{
MinLinesInFirstParagraph = 2,
MinLinesInLastParagraph = 2,
RestMarginTop = rc.Left,
};
// Open an arbitrary PDF, load it into a temp document and use the map to find some texts:
using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "TimeSheet.pdf"));
var doc1 = new GcPdfDocument();
doc1.Load(fs);
var tmap = doc1.Pages[0].GetTextMap();
// We retrieve the text at a specific (known to us) geometric location on the page:
float tx0 = 2.1f, ty0 = 3.37f, tx1 = 3.1f, ty1 = 3.4f;
HitTestInfo htiFrom = tmap.HitTest(tx0 * 72, ty0 * 72);
HitTestInfo htiTo = tmap.HitTest(tx1 * 72, ty1 * 72);
tmap.GetFragment(htiFrom.Pos, htiTo.Pos, out TextMapFragment range1, out string text1);
tl.AppendLine($"Looked for text in rectangle x={tx0:F2}\", y={ty0:F2}\", width={tx1 - tx0:F2}\", height={ty1 - ty0:F2}\", found:", tf);
tl.AppendLine(text1, tfFound);
tl.AppendLine();
// Get all text fragments and their locations on the page:
tl.AppendLine("List of all texts found on the page", tf);
tmap.GetFragment(out TextMapFragment range, out string text);
foreach (TextLineFragment tlf in range)
{
var coords = tmap.GetCoords(tlf);
tl.Append($"Text at ({coords.B.X / 72:F2}\",{coords.B.Y / 72:F2}\"):\t", tf);
tl.AppendLine(tmap.GetText(tlf), tfFound);
}
// Print the results:
tl.PerformLayout(true);
while (true)
{
// 'rest' will accept the text that did not fit:
var splitResult = tl.Split(to, out TextLayout rest);
doc.Pages.Last.Graphics.DrawTextLayout(tl, PointF.Empty);
if (splitResult != SplitResult.Split)
break;
tl = rest;
doc.NewPage();
}
// Append the original document for reference:
doc.MergeWithDocument(doc1, new MergeDocumentOptions());
// Done:
doc.Save(stream);
return doc.Pages.Count;
}
}
}