private void SplitTextElements()
{
var textElementsSplitted = new List <PdfTextElement>();
while (_textElements.Count > 0)
{
PdfTextElement elem = _textElements[0];
_textElements.Remove(elem);
double maxWidth = elem.MaxWidth();
int prevBreak = 0;
for (int i = 1; i < elem.Characters.Count; i++)
{
double prevCharEnd = elem.Characters[i - 1].Displacement + elem.Characters[i - 1].Width;
double charSeparation = elem.Characters[i].Displacement - prevCharEnd;
if (charSeparation > maxWidth)
{
PdfTextElement partElem = elem.SubPart(prevBreak, i);
textElementsSplitted.Add(partElem);
prevBreak = i;
}
}
if (prevBreak == 0)
{
textElementsSplitted.Add(elem);
continue;
}
PdfTextElement lastElem = elem.SubPart(prevBreak, elem.Characters.Count);
textElementsSplitted.Add(lastElem);
}
_textElements = textElementsSplitted;
}
private void JoinTextElements()
{
var textElementsCondensed = new List <PdfTextElement>();
while (_textElements.Count > 0)
{
PdfTextElement elem = _textElements[0];
_textElements.Remove(elem);
double blockY = elem.GetY();
double blockXMin = elem.GetX();
double blockXMax = blockXMin + elem.VisibleWidth;
// Prepare first neighbour
var textElementNeighbours = new List <PdfTextElement>();
textElementNeighbours.Add(elem);
// Search Neighbours
int i = 0;
while (i < _textElements.Count)
{
PdfTextElement neighbour = _textElements[i];
if (neighbour.Font != elem.Font || neighbour.FontSize != elem.FontSize)
{
i++;
continue;
}
double neighbourY = neighbour.GetY();
if (Math.Abs(neighbourY - blockY) > 0.001)
{
i++; continue;
}
double maxWidth = neighbour.MaxWidth();
double neighbourXMin = neighbour.GetX();
double neighbourXMax = neighbourXMin + neighbour.VisibleWidth;
double auxBlockXMin = blockXMin - maxWidth;
double auxBlockXMax = blockXMax + maxWidth;
if (auxBlockXMax >= neighbourXMin && neighbourXMax >= auxBlockXMin)
{
_textElements.Remove(neighbour);
textElementNeighbours.Add(neighbour);
if (blockXMax < neighbourXMax)
{
blockXMax = neighbourXMax;
}
if (blockXMin > neighbourXMin)
{
blockXMin = neighbourXMin;
}
i = 0;
continue;
}
i++;
}
if (textElementNeighbours.Count == 1)
{
textElementsCondensed.Add(elem);
continue;
}
// Join neighbours
var chars = new List <PdfCharElement>();
foreach (PdfTextElement neighbour in textElementNeighbours)
{
double neighbourXMin = neighbour.GetX();
foreach (PdfCharElement c in neighbour.Characters)
{
chars.Add(new PdfCharElement
{
Char = c.Char,
Displacement = (c.Displacement + neighbourXMin) - blockXMin,
Width = c.Width,
});
}
}
chars = chars.OrderBy(c => c.Displacement).ToList();
var sbText = new StringBuilder();
foreach (PdfCharElement c in chars)
{
sbText.Append(c.Char);
}
PdfTextElement blockElem = new PdfTextElement
{
Font = null,
FontSize = elem.FontSize,
Matrix = elem.Matrix.Copy(),
RawText = sbText.ToString(),
VisibleText = sbText.ToString(),
VisibleWidth = blockXMax - blockXMin,
VisibleHeight = elem.VisibleHeight,
Characters = chars,
Childs = textElementNeighbours,
};
blockElem.Matrix.Matrix[0, 2] = blockXMin;
textElementsCondensed.Add(blockElem);
}
_textElements = textElementsCondensed;
}