//// 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.Collections.Generic;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Text;using GrapeCity.Documents.Drawing;using DsPdfWeb.Demos.Common;using GrapeCity.Documents.Pdf.Annotations;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsPdfWeb.Demos{    // This sample loads all images found in a directory, then renders each image    // in the largest possible size on a separate page of the PDF.    // Finally it inserts a TOC of image thumbnails linked to the large images    // into the document.    // See also SlidePages.    public class ImageLinks    {        private class ImageInfo        {            public string Name;            public IImage Image;            public int PageIdx;        }
        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Bold.ttf"));            // 1/2" page margins all around:            const float margin = 36;
            // Load all images from the Resources/Images folder:            List<ImageInfo> imageInfos = [];            foreach (var fname in Directory.GetFiles(Path.Combine("Resources", "Images"), "*", SearchOption.AllDirectories))                imageInfos.Add(new ImageInfo() { Name = Path.GetFileName(fname), Image = Util.ImageFromFile(fname) });            imageInfos.Shuffle();            // Set up image alignment that would center images horizontally and align to top vertically:            var ia = new ImageAlign(ImageAlignHorz.Center, ImageAlignVert.Top, true, true, true, false, false);            // Image rectangle for full-sized images - whole page:            var rBig = new RectangleF(margin, margin, doc.PageSize.Width - margin * 2, doc.PageSize.Height - margin * 2);            // Render all images full-size, one image per page:            for (int i = 0; i < imageInfos.Count; ++i)            {                var g = doc.NewPage().Graphics;                var ii = imageInfos[i];                g.DrawImage(ii.Image, rBig, null, ia);                ii.PageIdx = i;            }            // Insert page(s) with thumbnails into the beginning of the document as a 4x5 grid (see SlidePages):            const int rows = 5;            const int cols = 4;            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;            // Center thumbnails vertically too:            ia.AlignVert = ImageAlignVert.Center;            // Text format for image captions:            var tf = new TextFormat() { Font = font, FontSize = sMargin * 0.65f };            // Insertion point:            var ip = new PointF(margin, margin);            var page = doc.Pages.Insert(0);            for (int i = 0; i < imageInfos.Count; ++i)            {                var ii = imageInfos[i];                var rect = new RectangleF(ip, new SizeF(sWidth - gapx, sHeight - gapy));                // Add a link to the page where the full-sized image is (the page index                // will be updated when we know how many pages are in TOC, see below):                page.Annotations.Add(new LinkAnnotation(rect, new DestinationFit(ii.PageIdx)));                // Draw thumbnail:                var g = page.Graphics;                g.FillRectangle(rect, Color.LightGray);                g.DrawRectangle(rect, Color.Black, 0.5f);                rect.Inflate(-sMargin, -sMargin);                g.DrawImage(ii.Image, 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(ii.Name, 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)                {                    ip.X = margin;                    ip.Y += sHeight;                    if (ip.Y + sHeight > doc.PageSize.Height)                    {                        page = doc.Pages.Insert(doc.Pages.IndexOf(page) + 1);                        ip.Y = margin;                    }                }            }            // We now go through all TOC pages, updating page indices in links' destinations            // to account for the TOC pages inserted in the beginning of the document:            int tocPages = doc.Pages.IndexOf(page) + 1;            for (int i = 0; i < tocPages; ++i)            {                foreach (var ann in doc.Pages[i].Annotations)                    if (ann is LinkAnnotation link && link.Dest is DestinationFit dest)                        link.Dest = new DestinationFit(dest.PageIndex.Value + tocPages);            }            // Done:            doc.Save(stream);            imageInfos.ForEach((ii_) => ii_.Image.Dispose());            return doc.Pages.Count;        }    }}