//// 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.TextMap;
namespace DsPdfWeb.Demos{    // Finds all occurrences of a regular expression (specifically,    // the regex searches for strings that look like dates or times)    // and changes the text rendering attributes of all those occurrences.    // The following attributes can be changed:    // - Text rendering mode (fill/stroke/clip);    // - Text fill color and alpha;    // - Text stroke color and alpha.    // For reference, the original PDF without changes is appended to the result.    // The original PDF and the search regex are the same as used in DeleteText.    public class ChangeTextAttrs    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "TimeSheet.pdf"));            doc.Load(fs);            var pageCount = doc.Pages.Count;            // Duplicate the PDF:            doc.MergeWithDocument(doc);            // Modify text on the first copy:            for (int i = 0; i < pageCount; ++i)            {                var ftps = new FindTextParams(@"\d+/\d+/\d+|\d+:\d+| am| pm", false, false, 72, 72, false, true);                // TextRenderingAttrs allows you to specify the following text rendering attributes:                // - RenderingMode                // - FillAlpha                // - FillColor                // - StrokeAlpha                // - StrokePen                doc.Pages[i].SetTextRenderingAttrs(ftps, new TextRenderingAttrs() {                    RenderingMode = TextRenderingMode.FillStroke,                    FillColor = Color.Red,                    FillAlpha = 0.5f,                    StrokeAlpha = 1.0f,                    StrokePen = new GrapeCity.Documents.Drawing.Pen(Color.Blue, 1)});            }            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}