//// 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.Pdf.Annotations;using GrapeCity.Documents.Svg;
namespace DsPdfWeb.Demos{    // Shows how to programmatically control which annotations to include when saving a PDF as images.    // The sample loads a one-page PDF containing several annotations, and saves that page as SVG    // using DrawAnnotationFilter to include only annotations which satisfy certain conditions    // (free text annotations that are within the page bounds).    // The SVG is then inserted as the first page of the resulting PDF.    // The second page shows the original PDF for reference.    // The PDF used by this sample was generated by AnnotationTypes.    public class AnnotationDrawFilter    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            // Load a PDF with some annotations into the document:            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "AnnotationTypes.pdf"));            doc.Load(fs);            using var svgStream = new MemoryStream();            // Draw the first page of the PDF into an SVG:            doc.Pages[0].SaveAsSvg(svgStream,                new SaveAsImageOptions()                {                    BackColor = Color.Transparent,                    DrawAnnotationFilter = (GcPdfDocument d, Page p, AnnotationBase a, ref bool draw) =>                    {                        // Draw only free text annotations which also fit horizontally within the page bounds:                        draw = a is FreeTextAnnotation fta && fta.Rect.Left > 0 && fta.Rect.Right < p.Size.Width;                    }                });            svgStream.Position = 0;            // Create a GcSvgDocument from the saved SVG so that we can draw it in the resulting PDF:            using var svgDoc = GcSvgDocument.FromStream(svgStream);            // Insert a page into the PDF and draw the SVG on it, compare to the original on the 2nd page:            var page = doc.Pages.Insert(0);            var g = page.Graphics;            var rc = new RectangleF(36, 36, page.Size.Width - 72, page.Size.Height - 72);            g.DrawRectangle(rc, Color.DarkGoldenrod);            g.FillRectangle(rc, Color.PaleGoldenrod);            g.DrawSvg(svgDoc, rc);
            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}