//
// 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.Pdf.Annotations;

namespace DsPdfWeb.Demos
{
    // This sample demonstrates the use of RedactOptions.CopyImagesOnRedact property.
    // By default, if all or part of an image falls within a redact area, and the image
    // appears elsewhere in the PDF, all locations are affected, i.e. the image will look
    // redacted throughout the document.
    // The RedactOptions.CopyImagesOnRedact property allows you to change this behavior.
    // If that property is true (it is false by default), the image is copied prior to
    // applying the redact, and only the copy under the redacted area is affected by the
    // redact.
    // This sample loads a two page PDF with the same image appearing three times
    // on the first, and three times on the second page.
    // Two redact annotations are then added to the document, both cover different parts
    // of the first image location on the first page.
    // The first redact uses red overlay fill color, and (by default) affects the image
    // in all locations, note the red rectangle in the top left part of the image
    // in all locations throughout the document.
    // The second redact uses blue overlay, and sets CopyImagesOnRedact to true, so
    // that only the instance of the image under the actual redact area is affected,
    // note the blue rectangle in the lower right part of the first image only.
    // The PDF used by this sample was generated by ImageTransparency.
    public class RedactCopyImages
    {
        public int CreatePDF(Stream stream)
        {
            var doc = new GcPdfDocument();
            // Load a PDF that contains the same image in several locations:
            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "ImageTransparency.pdf"));
            doc.Load(fs);
            // Duplicate the first page:
            doc.Pages.ClonePage(0, 1);

            // This redact will affect all image locations:
            var redact0 = new RedactAnnotation()
            {
                Page = doc.Pages[0],
                Rect = new RectangleF(50, 50, 50, 50),
                OverlayFillColor = Color.Red,
            };
            // This redact will affect only the image at the actual redact location:
            var redact1 = new RedactAnnotation()
            {
                Page = doc.Pages[0],
                Rect = new RectangleF(120, 120, 50, 50),
                OverlayFillColor = Color.Blue,
            };

            // Apply redact0 with default options:
            doc.Redact(redact0);
            // Apply redact1 with CopyImagesOnRedact on:
            doc.Redact(redact1, new RedactOptions() { CopyImagesOnRedact = true });

            // Save the PDF:
            doc.Save(stream);
            return doc.Pages.Count;
        }
    }
}