//// 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 GrapeCity.Documents.Pdf;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;        }    }}