// // This code is part of Document Solutions for PDF demos. // Copyright (c) MESCIUS inc. All rights reserved. // using System; using System.IO; using System.Drawing; using System.Linq; 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; } } }