/// <summary>
/// Remove short lines from line dictionary.
/// </summary>
/// <param name="diclines">Line dictionary</param>
void RemoveTooShortAndTooLongLines(Page page, SortedDictionary <double, FormLineList> diclines, bool isHorizontial, Rect posRect)
{
double[] pageSize = PdfTronHelper.GetPageSize(page);
double maxLength = isHorizontial ? pageSize[0] : pageSize[1];
diclines.Where(pair => pair.Value.Exists(line => Math.Abs(line.Length - maxLength) < 3))
.Select(pair => pair.Key).ToList()
.ForEach(key => diclines.Remove(key));
FormLineList _lines = new FormLineList(diclines.SelectMany(pair => pair.Value).ToList());
if (_lines.Count > 1)
{
if (isHorizontial)
{
double[] textLeftRightXValue = pdfTronHelper.GetLeftRightTextBounds(page);
maxLength = (textLeftRightXValue[1] - textLeftRightXValue[0]);
diclines.Where(x => x.Value.Sum(line => line.Length) < maxLength * 0.5
).Select(x => x.Key).ToList().ForEach(key => diclines.Remove(key));
foreach (double key in diclines.Keys.ToArray())
{
FormLineList lines = diclines[key];
if (lines.Count < 2)
{
continue;
}
double _maxLength = lines.Max(line => line.Length);
FormLine maxLengthLine = lines.Find(line => line.Length == _maxLength);
lines.Where(line => line.Length < (_maxLength * 0.7)).ToList().ForEach(line => lines.Remove(line));
}
FormLineList templines = new FormLineList(diclines.SelectMany(pair => pair.Value).ToList());
if (templines.Count > 1)
{
maxLength = templines.Select(line => line.Length).Max();
double scale = 0.4;
double minLength = maxLength * scale;
IEnumerable <double> shortLineKeys = diclines.Where(
x => x.Value.Sum(line => line.Length) < minLength
).Select(x => x.Key);
shortLineKeys.ToList().ForEach(key => diclines.Remove(key));
}
}
else
{
maxLength = posRect.Height();
if (posRect.Height() < 300)
{
maxLength = _lines.Select(line => line.Length).Max();
}
double minLength = maxLength * 0.4;
if (minLength < 9)
{
minLength = 9;
}
IEnumerable <double> shortLineKeys = diclines.Where(
x => x.Value.Sum(line => line.Length) < minLength
).Select(x => x.Key);
shortLineKeys.ToList().ForEach(key => diclines.Remove(key));
}
}
else
{
diclines.Clear();
}
}
public SortedDictionary <double, FormLineList>[] GetFormLines(int pageNum, LinePos startPos, LinePos endPos
, bool isSubsequentPage, SortedDictionary <double, FormLineList> lastPageVerticalLines)
{
//Get the information of lines and extreme points by travelsaling the page
horizontalLines = new SortedDictionary <double, FormLineList>();
verticalLines = new SortedDictionary <double, FormLineList>();
_pageNum = pageNum;
_startPos = startPos;
_endPos = endPos;
Page page = _pdfDoc.GetPage(pageNum);
pageSize = PdfTronHelper.GetPageSize(page);
topBound.AxisValue = startPos == null ? pageSize[1] : startPos.AxisValue;
bottomBound.AxisValue = endPos == null ? 0 : endPos.AxisValue;
ii = 0;
using (ElementReader page_reader = new ElementReader())
{
page_reader.Begin(page);
ProcessElements(page_reader);
}
RemoveLittleLines(horizontalLines);
RemoveLittleLines(verticalLines);
//Remove short lines.
Rect posRect = GetTablePosRect(_pageNum, _startPos, _endPos, isSubsequentPage);
RemoveTooShortAndTooLongLines(page, horizontalLines, true, posRect);
bool isNotNeedGenerateVerLines =
isSubsequentPage && lastPageVerticalLines != null && verticalLines.Count == lastPageVerticalLines.Count;
if (!isNotNeedGenerateVerLines)
{
RemoveTooShortAndTooLongLines(page, verticalLines, false, posRect);
}
//Generate drawed lines.
Rect areaRect;
bool existRealRect = horizontalLines.Count > 1 && verticalLines.Count > 1 && IsRect(posRect, horizontalLines, verticalLines);
areaRect = existRealRect ? GenerateRectByLines() : posRect;
if (existRealRect || isSubsequentPage)
{
RemoveLinesNotInRect(areaRect, horizontalLines, verticalLines);
isNotNeedGenerateVerLines =
isSubsequentPage && lastPageVerticalLines != null && verticalLines.Count == lastPageVerticalLines.Count;
}
else
{
posRect = GetTablePosRect(_pageNum, _startPos, _endPos, true);
}
FormLineGenerator.RemoveSpareNearLines(verticalLines, false);
if (!isNotNeedGenerateVerLines)
{
isNotNeedGenerateVerLines =
isSubsequentPage && lastPageVerticalLines != null && verticalLines.Count == lastPageVerticalLines.Count;
}
FormLineGenerator lineGenerator = new FormLineGenerator(page, areaRect);
SortedDictionary <double, FormLineList>[] lines = lineGenerator.GetFormLines(existRealRect, horizontalLines, verticalLines, isNotNeedGenerateVerLines);
return(lines);
}
/// <summary>
/// Constructor for TableBoundSearcher class
/// </summary>
/// <param name="pdfDoc">The pdf document object to be operated</param>
public FormLineSearcher(PDFDoc pdfDoc)
{
_pdfDoc = pdfDoc;
pdfTronHelper = new PdfTronHelper(pdfDoc);
}
