//// 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 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.Graphics;
namespace DsPdfWeb.Demos{    // This sample shows how to create FormXObject representing a page    // from a PDF loaded into a temporary GcPdfDocument, and render that    // object into the current document.    public class PageFormXObject    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            var page = doc.NewPage();            var g = page.Graphics;
            var rc = Common.Util.AddNote(                "The thumbnails below are pages from an existing document. " +                "We load an arbitrary PDF into a temporary GcPdfDocument, " +                "then create a FormXObject representing each of its pages, " +                "and render those objects as thumbnails into the current document. " +                "To show that the same FormXObject can be used more than once, " +                "we also render each thumbnail a second time applying a mirror transform.",                page);
            // Layout params:            var margin = rc.Left;            var pad = 36;            var side = (page.Size.Width - margin * 2 - pad) / 2;            var ip = new PointF(margin, rc.Bottom + pad);            // Mirror transform:            var tr = Matrix3x2.CreateScale(-1, 1) * Matrix3x2.CreateTranslation(page.Size.Width, 0);            // Text format for the overlaid page captions:            var color = Color.DarkRed;            var tf = new TextFormat()            {                Font = StandardFonts.HelveticaBold,                FontSize = 16,                ForeColor = Color.FromArgb(128, color),            };            // Open an arbitrary PDF, load it into a temp document and loop over its pages,            // drawing each into the current document:            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "Wetlands.pdf"));            var doc1 = new GcPdfDocument();            doc1.Load(fs);            // Create a list of FormXObject for the pages of the loaded PDF:            var fxos = new List<FormXObject>();            doc1.Pages.ToList().ForEach(p_ => fxos.Add(new FormXObject(doc, p_)));            // Render the thumbnails into the current document:            for (int i = 0; i < fxos.Count; ++i)            {                if (ip.Y + side > page.Size.Height - margin)                {                    page = doc.NewPage();                    g = page.Graphics;                    ip = new PointF(margin, margin);                }                var rcfx = new RectangleF(ip.X, ip.Y, side, side);                // Draw direct:                g.DrawForm(fxos[i], rcfx, null, ImageAlign.ScaleImage);                g.DrawRectangle(rcfx, color);                g.DrawString($"Page {i + 1}", tf, rcfx, TextAlignment.Center, ParagraphAlignment.Center, false);                // Draw reversed:                g.Transform = tr;                g.DrawForm(fxos[i], rcfx, null, ImageAlign.ScaleImage);                g.DrawRectangle(rcfx, color);                g.Transform = Matrix3x2.Identity;                rcfx.Offset(side + pad, 0);                g.DrawString($"Reversed page {i + 1}", tf, rcfx, TextAlignment.Center, ParagraphAlignment.Center, false);                //                ip.Y += side + pad;            }            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}