//// 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.Pdf;using GrapeCity.Documents.Pdf.Graphics;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsPdfWeb.Demos{    // This sample shows how to convert a PDF with A3 landscape oriented pages to a PDF    // in which each source PDF's A3 landscape page is split into two A4 portrait pages.    //     // For each of the source PDF's A3 landscape pages we create a FormXObject representing it,    // add two A4 portrait pages to the target document, and then render the FormXObject    // onto each of the A4 pages' graphics with left and right alignment and no scaling.    // Effectively, this renders the left half of the source A3 page on the first A4 page,    // and the right half of it on the second A4 page.    public class SplitA3toA4x2    {        public int CreatePDF(Stream stream)        {            // A3 and A4 page sizes:            // A3 is 11.69" � 16.54":            var sizeA3 = new SizeF(11.69f * 72, 16.54f * 72);            // A4 is 8.27" x 11.60":            var sizeA4 = new SizeF(8.27f * 72, 11.60f * 72);
            // Create a sample source PDF with A3 landscape oriented pages:            var docA3 = new GcPdfDocument()            {                PageSize = sizeA3,                Landscape = true,            };                        // First page is a horizontal image filling the whole page:            var p0 = docA3.Pages.Add();            var imgA3 = GCDRAW.Image.FromFile(Path.Combine("Resources", "Images", "aurora.jpg"));            p0.Graphics.DrawImage(imgA3, new RectangleF(PointF.Empty, docA3.PageSize), null, GCDRAW.ImageAlign.StretchImage);
            // Add a few more A3 pages as two columns of random 'lorem ipsum' text:            var p1 = docA3.Pages.Add();            var g = p1.Graphics;            var tl = g.CreateTextLayout();            tl.DefaultFormat.Font = StandardFonts.Times;            tl.DefaultFormat.FontSize = 12;            tl.TextAlignment = GCTEXT.TextAlignment.Justified;            tl.FirstLineIndent = 72 / 2;            tl.ParagraphSpacing = 72 / 8;            // Add random text:            tl.Append(Common.Util.LoremIpsum(37));            // Specify 1/4" margins all around:            const float margin = 72 / 4;            tl.MarginAll = margin;            var colWidth = p1.Size.Width / 2;            tl.MaxWidth = colWidth;            tl.MaxHeight = p1.Size.Height;            tl.PerformLayout(true);            // In a loop, split and render the text in a 2 column layout, adding pages as needed:            int col = 0;            while (true)            {                // 'rest' will accept the text that did not fit:                var splitResult = tl.Split(null, out GCTEXT.TextLayout rest);                g.DrawTextLayout(tl, new PointF(col * colWidth, 0));                if (splitResult != GCTEXT.SplitResult.Split)                    break;                tl = rest;                if (++col == 2)                {                    docA3.Pages.Add();                    g = docA3.Pages.Last.Graphics;                    col = 0;                }            }            // At this point, 'docA3' is a PDF with landscape oriented A3 pages,            // the first page contains an image filling the whole page,            // other pages contain random text in two vertical column layout.            //            // The document may be saved for reference if needed:            // docA3.Save("docA3.pdf");
            // Create the resulting (target) PDF with A4 page size:            var doc = new GcPdfDocument()            {                PageSize = sizeA4,                Landscape = false,            };
            // FormXObjects are rendered on graphics like images, but without losing fidelity.            // We create two image alignments for the left and the right halves of the source A3 page:            var iaLeft = new GCDRAW.ImageAlign(GCDRAW.ImageAlignHorz.Left, GCDRAW.ImageAlignVert.Top, false, false, true, false, false);            var iaRight = new GCDRAW.ImageAlign(GCDRAW.ImageAlignHorz.Right, GCDRAW.ImageAlignVert.Top, false, false, true, false, false);            foreach (var pA3 in docA3.Pages)            {                // Create FormXObject representing the source page:                var fxoA3 = new FormXObject(doc, pA3);                // Draw its left and right halves on separate pages of the target PDF:                var pLeft = doc.Pages.Add();                pLeft.Graphics.DrawForm(fxoA3, pLeft.Bounds, pLeft.Bounds, iaLeft);                var pRight = doc.Pages.Add();                pRight.Graphics.DrawForm(fxoA3, pLeft.Bounds, pLeft.Bounds, iaRight);            }
            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}