//// 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 GrapeCity.Documents.Text;using GrapeCity.Documents.Pdf;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsPdfWeb.Demos{    // This sample demonstrates how to extract text from an existing PDF.    // It loads an arbitrary PDF into a temporary GcPdfDocument, then    // retrieves text from each page of that document using the Page.GetText() method,    // adds all those texts to a TextLayout and renders it into the current document.    // An alternative to Page.GetText() is the method GcPdfDocument.GetText()    // which retrieves the text from the whole document at once.    public class ExtractParagraphs    {        public int CreatePDF(Stream stream)        {            const int margin = 36;            var c1 = Color.PaleGreen;            var c2 = Color.PaleGoldenrod;
            var doc = new GcPdfDocument();            var page = doc.NewPage();
            var rc = Common.Util.AddNote(                "Here we load an existing PDF (Wetlands) into a temporary GcPdfDocument, " +                "and iterate over the pages of that document, printing all paragraphs found on the page. " +                "We alternate the background color for the paragraphs so that the bounds between paragraphs are more clear. " +                "The original PDF is appended to the generated document for reference.",                page,                new RectangleF(margin, margin, page.Size.Width - margin * 2, 0));
            // Text format for captions:            var tf = new TextFormat()            {                Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSerif-Regular.ttf")),                FontSize = 14,                ForeColor = Color.Blue            };            // Text format for the paragraphs:            var tfpar = new TextFormat()            {                Font = StandardFonts.Times,                FontSize = 12,                BackColor = c1,            };            // Text layout to render the text:            var tl = page.Graphics.CreateTextLayout();            tl.MaxWidth = doc.PageSize.Width;            tl.MaxHeight = doc.PageSize.Height;            tl.MarginAll = rc.Left;            tl.MarginTop = rc.Bottom + 36;            // Text split options for widow/orphan control:            var to = new TextSplitOptions(tl)            {                MinLinesInFirstParagraph = 2,                MinLinesInLastParagraph = 2,                RestMarginTop = rc.Left,            };
            // Open an arbitrary PDF, load it into a temp document and get all page texts:            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "Wetlands.pdf"));            var doc1 = new GcPdfDocument();            doc1.Load(fs);
            for (int i = 0; i < doc1.Pages.Count; ++i)            {                tl.AppendLine(string.Format("Paragraphs from page {0} of the original PDF:", i + 1), tf);
                var pg = doc1.Pages[i];                var pars = pg.GetTextMap().Paragraphs;                foreach (var par in pars)                {                    tl.AppendLine(par.GetText(), tfpar);                    tfpar.BackColor = tfpar.BackColor == c1 ? c2 : c1;                }            }
            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;        }    }}