// // 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 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; } } }