public IEnumerable <SentenceModel> Right(SentenceModel sentence)
{
var i = GetIndex(sentence);
if (i < 0)
{
yield break;
}
i += 1;
while (i < Sentences.Count)
{
var candidate = Sentences[i];
if (Math.Abs(candidate.Bottom - sentence.Bottom) < YTolerance)
{
if (candidate.Right > sentence.Right)
{
yield return(candidate);
}
else
{
yield break;
}
}
i += 1;
}
}
public IEnumerable <SentenceModel> Left(SentenceModel sentence)
{
var i = GetIndex(sentence);
if (i < 0)
{
yield break;
}
i -= 1;
while (i > 0)
{
var candidate = Sentences[i];
if (Math.Abs(candidate.Bottom - sentence.Bottom) < YTolerance)
{
if (candidate.Left < sentence.Left)
{
yield return(candidate);
}
else
{
yield break;
}
}
i -= 1;
}
}
private bool AreInSameColumn(SentenceModel main, SentenceModel secondary)
{
var isMainRightMost = !Right(main).Any();
var isSecondaryRightMost = !Right(secondary).Any();
if (isMainRightMost && isSecondaryRightMost)
{
var leftOfMain = Left(main).FirstOrDefault();
var leftOfSecondary = Left(secondary).FirstOrDefault();
if (leftOfMain?.Right < main.Left &&
leftOfMain.Right < secondary.Left &&
leftOfSecondary?.Right < main.Left &&
leftOfSecondary.Right < secondary.Left
)
{
return(true);
}
}
var midX = main.Left + main.Width / 2;
var secondaryLeft = (Left(secondary).FirstOrDefault()?.Right + secondary.Left) / 2 ?? secondary.Left - 100;
var candidateRight = (Right(secondary).FirstOrDefault()?.Left + secondary.Right) / 2 ?? secondary.Right + 100;
var areInSameColumn = secondaryLeft <= midX && midX <= candidateRight;
return(areInSameColumn);
}
private int GetIndex(SentenceModel sentence)
{
var index = sentence.PageIndex;
if (index < 0)
{
return(-1);
}
if (index > Sentences.Count)
{
return(-1);
}
return(Sentences[index] == sentence ? index : -1);
}
public IEnumerable <SentenceModel> Below(SentenceModel sentence)
{
var i = GetIndex(sentence);
if (i < 0)
{
yield break;
}
i += 1;
while (i < Sentences.Count)
{
var candidate = Sentences[i];
if (candidate.Bottom > sentence.Bottom)
{
if (AreInSameColumn(sentence, candidate))
{
yield return(candidate);
}
}
i += 1;
}
}
public SentenceModel Above(SentenceModel sentence)
{
var i = GetIndex(sentence);
if (i < 0)
{
return(null);
}
i -= 1;
while (i >= 0)
{
var candidate = Sentences[i];
if (candidate.Bottom < sentence.Bottom)
{
if (AreInSameColumn(sentence, candidate))
{
return(candidate);
}
}
i -= 1;
}
return(null);
}