// // 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.Svg; using GCTEXT = GrapeCity.Documents.Text; using GCDRAW = GrapeCity.Documents.Drawing; using DsPdfWeb.Demos.Common; namespace DsPdfWeb.Demos { // This sample is similar to SvgClipArt, but after loading each SVG image // it converts all strokes and fills in it to grayscale. // // The SVG clip art used in this sample is from freesvg.org. public class SvgToGrayscale { void ToGrayscale(SvgElementCollection elements) { foreach (var el in elements) { if (el is SvgGraphicsElement elg) { elg.Stroke = PaintToGrayscale(elg.Stroke); elg.Fill = PaintToGrayscale(elg.Fill); } ToGrayscale(el.Children); } } // Simplified conversion of an SvgPaint to grayscale // (Y formula from https://goodcalculators.com/rgb-to-grayscale-conversion-calculator/): SvgPaint PaintToGrayscale(SvgPaint src) { if (src == null) return null; else if (src.PaintType == SvgPaintType.Color) { var rgb = src.Color.Rgb; var Y = (int)Math.Round(0.299 * rgb.R + 0.587 * rgb.G + 0.114 * rgb.B); return new SvgPaint(Color.FromArgb(Y, Y, Y)); } else { return new SvgPaint(Color.Gray); } } public int CreatePDF(Stream stream) { // Load images from the resources folder: var images = new List<(string, GcSvgDocument)>(); foreach (var fname in Directory.GetFiles(Path.Combine("Resources", "SvgClipArt"), "*", SearchOption.AllDirectories)) { var svg = GcSvgDocument.FromFile(fname); ToGrayscale(svg.RootSvg.Children); images.Add((Path.GetFileName(fname), svg)); } images.Shuffle(); var doc = new GcPdfDocument(); // Font and format for captions: const float sMargin = 72f / 6; var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Regular.ttf")); var tf = new TextFormat() { Font = font, FontSize = sMargin * 0.65f }; // Set up a 3x4 layout 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; } var ip = new PointF(margin, margin); // Render all images within the grid, adding new pages as needed: var g = doc.NewPage().Graphics; for (int i = 0; i < images.Count(); ++i) { // Draw border around image: 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); // Draw the SVG: var svg = images[i].Item2; var s = svg.GetIntrinsicSize(SvgLengthUnits.Points); if (s.Width > 0 && s.Height > 0) { // If image proportions are different from our target rectangle, // we resize the rectangle centering the image in it: var qSrc = s.Width / s.Height; var qTgt = rect.Width / rect.Height; if (qSrc < qTgt) rect.Inflate(rect.Width * (qSrc / qTgt - 1) / 2, 0); else if (qSrc > qTgt) rect.Inflate(0, rect.Height * (qTgt / qSrc - 1) / 2); } // Render the SVG: g.DrawSvg(svg, rect); // 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; } } }