//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//
using System;using System.IO;using System.Collections.Generic;using GrapeCity.Documents.Pdf;
namespace DsPdfWeb.Demos{    // This sample creates a multi-layer PDF document from a set of PDFs    // each of which shows a certain part of an electrical plan of a house.    // Each PDF is added as a separate layer. The resulting PDF provides    // optional content that allows the user to selectively see parts of    // the electrical wiring of a house (e.g. just the HVAC setup, or    // just the outlets, etc.).    public class HousePlanLayers    {        public int CreatePDF(Stream stream)        {            // The list of PDF names' parts identifying their semantics:            string[] fnames =            [                "full_electrical_plan.pdf",                "all_outlets.pdf",                "data_plan_and_detectors.pdf",                "HVAC_with_wiring.pdf",                "lighting_plan.pdf",                "lighting_plan_with_wiring.pdf",                "security_system_plan.pdf",            ];            // The common base name:            var fbase = "how_to_read_electrical_plans_";            // The directory containing the PDFs:            var dir = Path.Combine("Resources", "PDFs");
            GcPdfDocument doc = null;            Page page = null;            GcPdfGraphics g = null;            var disposables = new List<IDisposable>();            // Combine all PDFs into a single document.            // The first PDF is used as the base,            // additional PDFs are added as optional content (layers):            for (int i = 0; i < fnames.Length; ++i)            {                var iname = fnames[i];                var idoc = new GcPdfDocument();                var ifs = File.OpenRead(Path.Combine(dir, fbase + iname));                idoc.Load(ifs);                disposables.Add(ifs);                if (i == 0)                {                    doc = idoc;                    page = idoc.Pages.Last;                    g = page.Graphics;                }                else                {                    doc.OptionalContent.AddLayer(iname);                    doc.OptionalContent.SetLayerDefaultState(iname, false);                    g.BeginLayer(iname);                    g.DrawPdfPage(idoc.Pages[0], page.Bounds);                    g.EndLayer();                }            }            // Save the PDF:            doc.Save(stream);
            // Dispose file streams:            disposables.ForEach(d_ => d_.Dispose());            return doc.Pages.Count;        }    }}