//// 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.Drawing;using System.Collections.Generic;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Text;using GrapeCity.Documents.Drawing;using DsPdfWeb.Demos.Common;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsPdfWeb.Demos{    // Creates pages of 'slides' from all images found in a directory.    //    // IMPORTANT NOTE: When you render an image in DsPdf multiple times (e.g. rendering    // the same image as part of a page header on all pages), it will automatically be    // added to a dictionary and reused throughout the document, provided you use    // the same image object on all pages. So rather than loading the same image from    // file (or stream) each time it is needed, it is always preferable to load the image    // once and cache it in an image object. This applies to all image types used in DsPdf.    public class SlidePages    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            // Get a font for captions:            var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Regular.ttf"));            // GcPdfDocument.ImageOptions allow you to control various image-related settings.            // In particular, we can lower the JPEG quality from the default 75% to reduce the file size:            doc.ImageOptions.JpegQuality = 50;
            // Load all images from the Resources/Images folder:            List<Tuple<string, IImage>> images = new List<Tuple<string, IImage>>();            foreach (var fname in Directory.GetFiles(Path.Combine("Resources", "Images"), "*", SearchOption.AllDirectories))                images.Add(Tuple.Create(Path.GetFileName(fname), Util.ImageFromFile(fname)));            images.Shuffle();            // Print all images as slide sheets in a 3x4 grid with 1/2" margins all around:            const float margin = 36;            const int rows = 4;            const int cols = 3;            float gapx = 72f / 4, gapy = gapx;            float sWidth = (doc.PageSize.Width - margin * 2 + gapx) / cols;            float sHeight = (doc.PageSize.Height - margin * 2 + gapy) / rows;            if (sWidth > sHeight)            {                gapx += sWidth - sHeight;                sWidth = sHeight;            }            else            {                gapy += sHeight - sWidth;                sHeight = sWidth;            }            const float sMargin = 72f / 6;            // Set up image alignment that would center images within the specified area:            var ia = new ImageAlign(ImageAlignHorz.Center, ImageAlignVert.Center, true, true, true, false, false);            // Text format for image captions:            var tf = new TextFormat() { Font = font, FontSize = sMargin * 0.65f };            // Insertion point:            var ip = new PointF(margin, margin);            var g = doc.NewPage().Graphics;            for (int i = 0; i < images.Count; ++i)            {                var rect = new RectangleF(ip, new SizeF(sWidth - gapx, sHeight - gapy));                g.FillRectangle(rect, Color.LightGray);                g.DrawRectangle(rect, Color.Black, 0.5f);                rect.Inflate(-sMargin, -sMargin);                // We get the actual rectangle where the image was drawn from the DrawImage method                // (via an output parameter) so that we can draw a thin border exactly around the image                // (an array is required as the image can be tiled, in which case multiple rectangles                // will be returned):                g.DrawImage(images[i].Item2, rect, null, ia, out RectangleF[] imageRect);                g.DrawRectangle(imageRect[0], Color.DarkGray, 1);                // Print image file name as caption in the bottom slide margin:                g.DrawString(Path.GetFileName(images[i].Item1), tf,                     new RectangleF(rect.X, rect.Bottom, rect.Width, sMargin),                    TextAlignment.Center, ParagraphAlignment.Near, false);                ip.X += sWidth;                if (ip.X + sWidth > doc.PageSize.Width && i < images.Count - 1)                {                    ip.X = margin;                    ip.Y += sHeight;                    if (ip.Y + sHeight > doc.PageSize.Height)                    {                        g = doc.NewPage().Graphics;                        ip.Y = margin;                    }                }            }            // Done:            doc.Save(stream);            // Dispose images after saving the PDF:            images.ForEach(t_ => t_.Item2.Dispose());            return doc.Pages.Count;        }    }}