VisualComparisonTest

1//
2// Copyright (c) 2001-2020 by PDFTron Systems Inc. All Rights Reserved.
3//
4
5using System;
6using System.IO;
7using System.Threading.Tasks;
8using Windows.Foundation;
9
10using pdftron.PDF;
11using pdftron.SDF;
12
13using PDFNetUniversalSamples.ViewModels;
14
15namespace PDFNetSamples
16{
17    public sealed class VisualComparisionTest : Sample
18    {
19        public VisualComparisionTest() :
20            base("VisualComparision", "PDFNet can generate a visual comparison between two different documents. The comparison result itself is a resolution independent PDF -- well suited for adding high-quality diff support into existing app workflows.")
21        {
22        }
23
24        public override IAsyncAction RunAsync()
25        {
26            return Task.Run(new System.Action(async () => {
27                WriteLine("--------------------------------");
28                WriteLine("Starting Visual Comparision Test...");
29                WriteLine("--------------------------------\n");
30
31                bool error = await DiffingTestAsync();
32
33                if (error)
34                {
35                    WriteLine("Visual Comparision failed");
36                }
37                else
38                {
39                    WriteLine("Visual Comparision succeeded");
40                }
41
42                WriteLine("\n--------------------------------");
43                WriteLine("Done Visual Comparision Test.");
44                WriteLine("--------------------------------\n");
45            })).AsAsyncAction();
46        }
47
48        private async Task<bool> DiffingTestAsync()
49        {
50            bool error = false;
51
52            string firstDocumentPath = Path.Combine(InputPath, "diff_doc_1.pdf");
53            string secondDocumentPath = Path.Combine(InputPath, "diff_doc_2.pdf");
54            string outputDocumentPath = Path.Combine(OutputPath, "VisualComparision.pdf");
55
56            if ((!File.Exists(firstDocumentPath)) || (!File.Exists(secondDocumentPath)))
57            {
58                WriteLine("Atleast one input file does not exist. Aborting.");
59                error = true;
60                return error;
61            }
62
63            try
64            {
65				using (PDFDoc firstDocument = new PDFDoc(firstDocumentPath))
66				using (PDFDoc secondDocument = new PDFDoc(secondDocumentPath))
67				{
68					Page firstDocumentPage = firstDocument.GetPage(1);
69					Page secondDocumentPage = secondDocument.GetPage(1);
70
71					DiffOptions diffOptions = new DiffOptions();
72					diffOptions.SetColorA(new ColorPt(1, 0, 0));
73					diffOptions.SetColorB(new ColorPt(0, 0, 0));
74					diffOptions.SetBlendMode(GStateBlendMode.e_bl_normal);
75
76					PDFDoc outputDocument = new PDFDoc();
77					outputDocument.AppendVisualDiff(firstDocumentPage, secondDocumentPage, diffOptions);
78					await outputDocument.SaveAsync(outputDocumentPath, SDFDocSaveOptions.e_linearized);
79                    await AddFileToOutputList(outputDocumentPath).ConfigureAwait(false);
80                }
81            }
82            catch (Exception e)
83            {
84                WriteLine(GetExceptionMessage(e));
85                error = true;
86            }
87
88            return error;
89        }
90    }
91}