// // 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 GrapeCity.Documents.Pdf; using GrapeCity.Documents.Text; using GrapeCity.Documents.Drawing; using GCTEXT = GrapeCity.Documents.Text; using GCDRAW = GrapeCity.Documents.Drawing; namespace DsPdfWeb.Demos { // This sample demonstrates the ability of DsPdf to render // images using a specified transparency (opacity). public class ImageTransparency { public int CreatePDF(Stream stream) { var doc = new GcPdfDocument(); var page = doc.NewPage(); var g = page.Graphics; var rc = Common.Util.AddNote( "GcPdfGraphics.DrawImage() method allows rendering images with a specified opacity. " + "Below is a random text with an image drawn on top of it using opacity 0.2 (almost transparent), " + "0.5 (medium transparency) and 1 (non-transparent).", page); var tl = g.CreateTextLayout(); tl.DefaultFormat.Font = StandardFonts.Times; tl.DefaultFormat.FontSize = 12; tl.MaxWidth = page.Size.Width; tl.MaxHeight = page.Size.Height; tl.MarginAll = 36; tl.MarginTop += rc.Bottom; tl.Append(Common.Util.LoremIpsum(2)); tl.PerformLayout(true); g.DrawTextLayout(tl, PointF.Empty); using (var image = GCDRAW.Image.FromFile(Path.Combine("Resources", "Images", "puffins.jpg"))) { var imageRc = new RectangleF(tl.MarginLeft, tl.MarginTop, 144, 144); // Opacity 0.2: g.DrawImage(image, imageRc, null, ImageAlign.ScaleImage, 0.2f); imageRc.Offset(imageRc.Width + 36, 0); // Opacity 0.5: g.DrawImage(image, imageRc, null, ImageAlign.ScaleImage, 0.5f); imageRc.Offset(imageRc.Width + 36, 0); // Opacity 1 (default): g.DrawImage(image, imageRc, null, ImageAlign.ScaleImage); // NOTE: we must save document BEFORE disposing the image(s) used in it: doc.Save(stream); } return doc.Pages.Count; } } }