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Updating woth comments

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BobLd
2019-08-07 13:49:05 +01:00
parent 85d5bb7c7e
commit e19b03035e
1 changed files with 12 additions and 7 deletions
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19
src/UglyToad.PdfPig/DocumentLayoutAnalysis/TextEdgesExtractor.cs
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@@ -9,7 +9,7 @@ using UglyToad.PdfPig.Geometry;
namespace UglyToad.PdfPig.DocumentLayoutAnalysis namespace UglyToad.PdfPig.DocumentLayoutAnalysis
{ {
/// <summary> /// <summary>
/// Text edges extractor. Text edges are where words have either there BoundingBox's left, right or mid coordinates aligned on the same vertical line. /// Text edges extractor. Text edges are where words have either their BoundingBox's left, right or mid coordinates aligned on the same vertical line.
/// <para>Useful to detect text columns, tables, justified text, lists, etc.</para> /// <para>Useful to detect text columns, tables, justified text, lists, etc.</para>
/// </summary> /// </summary>
public class TextEdgesExtractor public class TextEdgesExtractor
@@ -17,11 +17,11 @@ namespace UglyToad.PdfPig.DocumentLayoutAnalysis
/// <summary> /// <summary>
/// Functions used to define left, middle and right edges. /// Functions used to define left, middle and right edges.
/// </summary> /// </summary>
private static readonly Tuple<string, Func<PdfRectangle, decimal>>[] edgesFuncs = new Tuple<string, Func<PdfRectangle, decimal>>[] private static readonly Tuple<EdgeType, Func<PdfRectangle, decimal>>[] edgesFuncs = new Tuple<EdgeType, Func<PdfRectangle, decimal>>[]
{ {
Tuple.Create<string, Func<PdfRectangle, decimal>>("left", x => Math.Round(x.Left, 0)), // use BoundingBox's left coordinate Tuple.Create<EdgeType, Func<PdfRectangle, decimal>>(EdgeType.Left, x => Math.Round(x.Left, 0)), // use BoundingBox's left coordinate
Tuple.Create<string, Func<PdfRectangle, decimal>>("mid", x => Math.Round(x.Left + x.Width / 2, 0)), // use BoundingBox's mid coordinate Tuple.Create<EdgeType, Func<PdfRectangle, decimal>>(EdgeType.Mid, x => Math.Round(x.Left + x.Width / 2, 0)), // use BoundingBox's mid coordinate
Tuple.Create<string, Func<PdfRectangle, decimal>>("right", x => Math.Round(x.Right, 0)) // use BoundingBox's right coordinate Tuple.Create<EdgeType, Func<PdfRectangle, decimal>>(EdgeType.Right, x => Math.Round(x.Right, 0)) // use BoundingBox's right coordinate
}; };
/// <summary> /// <summary>
@@ -29,11 +29,16 @@ namespace UglyToad.PdfPig.DocumentLayoutAnalysis
/// </summary> /// </summary>
/// <param name="pageWords">The words in the page.</param> /// <param name="pageWords">The words in the page.</param>
/// <param name="minimumElements">The minimum number of elements to define a text edge.</param> /// <param name="minimumElements">The minimum number of elements to define a text edge.</param>
public static Dictionary<string, List<PdfLine>> GetEdges(IEnumerable<Word> pageWords, int minimumElements = 4) public static IReadOnlyDictionary<EdgeType, List<PdfLine>> GetEdges(IEnumerable<Word> pageWords, int minimumElements = 4)
{ {
if (minimumElements < 0)
{
throw new ArgumentException("TextEdgesExtractor.GetEdges(): The minimum number of elements should be positive.", "minimumElements");
}
var cleanWords = pageWords.Where(x => !string.IsNullOrWhiteSpace(x.Text.Trim())); var cleanWords = pageWords.Where(x => !string.IsNullOrWhiteSpace(x.Text.Trim()));
ConcurrentDictionary<string, List<PdfLine>> dictionary = new ConcurrentDictionary<string, List<PdfLine>>(); ConcurrentDictionary<EdgeType, List<PdfLine>> dictionary = new ConcurrentDictionary<EdgeType, List<PdfLine>>();
Parallel.ForEach(edgesFuncs, f => Parallel.ForEach(edgesFuncs, f =>
{ {