//
// 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.Pdf.Annotations;

namespace DsPdfWeb.Demos
{
    // This sample shows how to use the Page.AdjustCoordinates() method
    // to convert visual coordinates (measured from the top left corner
    // of the page according to DsPdf rules) to correct coordinates in a PDF
    // that was loaded into GcPdfDocument and may have arbitrary unknown
    // transformations applied to its pages. The adjusted coordinates can be
    // used to position annotations (redact in this case) etc.
    //
    // The PDF used in this sample has one page containing the scan of a sample invoice
    // that was rotated 90 degrees clockwise. The PDF page is rotated 270 degrees to
    // compensate (so that visually the page has correct portrait orientation).
    public class AdjustCoords
    {
        public int CreatePDF(Stream stream)
        {
            var doc = new GcPdfDocument();
            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "invoice-scan-rot270.pdf"));
            doc.Load(fs);

            if (doc.Pages.Count != 1)
                throw new Exception("Unexpected: sample invoice should have exactly one page.");

            var page = doc.Pages[0];

            // The bounding rectangle of the area to redact,
            // measured from the top left corner of the PDF page.
            // If this rectangle is used as is, it will miss the target content:
            var rectToRedact = new RectangleF(20, 170, 200, 40);

            // The adjusted bounding rectangle, taking into consideration
            // any possible page transformations (rotation in this case):
            var adjusted = page.AdjustCoordinates(rectToRedact);

            // Note: if 'rectToRedact' is used instead of 'adjusted',
            // the redact will miss the target (customer name/address):
            var redact = new RedactAnnotation()
            {
                Page = page,
                Rect = adjusted,
                OverlayFillColor = Color.Orange,
                OverlayText = "Redacted",
            };
            // Apply the redact:
            doc.Redact(redact);

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