//// 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.Linq;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.).    // Note that this example is similar to HousePlanLayers, but unlike    // that sample, here ALL content is added as layers (in HousePlanLayers,    // the full electrical plan content does not belong to any layer).    public class HousePlanAllLayers    {        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");
            var doc = new GcPdfDocument();            var page = doc.Pages.Add();            var g = page.Graphics;            var disposables = new List<IDisposable>();            // Combine all PDFs into a single document as layers on the first page:            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);                doc.OptionalContent.AddLayer(iname);                doc.OptionalContent.SetLayerDefaultState(iname, false);                g.BeginLayer(iname);                g.DrawPdfPage(idoc.Pages[0], page.Bounds);                g.EndLayer();            }            // Make the last layer visible by default:            doc.OptionalContent.SetLayerDefaultState(fnames.Last(), true);
            // Save the PDF:            doc.Save(stream);
            // Dispose file streams:            disposables.ForEach(d_ => d_.Dispose());            return doc.Pages.Count;        }    }}