//https://github.com/pdfminer/pdfminer.six/blob/f389b97923c7a847bc9c6f4c3374951e1a7ff764/pdfminer/layout.py#L593
/// <summary>
/// group_objects: group text object to textlines.
/// </summary>
/// <param name="laparams"></param>
/// <param name="objs"></param>
/// <returns></returns>
public IEnumerable <TextLine> group_objects(LAParams laparams, IEnumerable <Letter> objs)
{
Letter obj0 = null;
TextLine line = null;
foreach (var obj1 in objs)
{
if (obj0 != null)
{
// halign: obj0 and obj1 is horizontally aligned.
//
// +------+ - - -
// | obj0 | - - +------+ -
// | | | obj1 | | (line_overlap)
// +------+ - - | | -
// - - - +------+
//
// |<--->|
// (char_margin)
var halign = obj0.is_compatible(obj1) && obj0.is_voverlap(obj1) &&
Math.Min(obj0.GlyphRectangle.Height, obj1.GlyphRectangle.Height) * laparams.line_overlap < obj0.voverlap(obj1) &&
obj0.hdistance(obj1) < Math.Max(obj0.GlyphRectangle.Width, obj1.GlyphRectangle.Width) * laparams.char_margin;
var is_hoverlap = DocstrumBoundingBoxes.GetStructuralBlockingParameters(new PdfLine(obj0.StartBaseLine, obj0.EndBaseLine), new PdfLine(obj1.StartBaseLine, obj1.EndBaseLine), 1e-3,
out double angularDifference, out double normalisedOverlap, out double perpendicularDistance);
// valign: obj0 and obj1 is vertically aligned.
//
// +------+
// | obj0 |
// | |
// +------+ - - -
// | | | (char_margin)
// +------+ - -
// | obj1 |
// | |
// +------+
//
// |<-->|
// (line_overlap)
var valign = laparams.detect_vertical && obj0.is_compatible(obj1) && obj0.is_hoverlap(obj1) &&
Math.Min(obj0.GlyphRectangle.Width, obj1.GlyphRectangle.Width) * laparams.line_overlap < obj0.hoverlap(obj1) &&
obj0.vdistance(obj1) < Math.Max(obj0.GlyphRectangle.Height, obj1.GlyphRectangle.Height) * laparams.char_margin;
if ((halign && line.isHorizontal()) || (valign && line.isVertical()))
{
//line.Add(obj1);
throw new NotImplementedException();
}
else if (line != null)
{
yield return(line);
line = null;
}
else
{
if (valign && !halign)
{
throw new NotImplementedException();
}
else if (halign && !valign)
{
throw new NotImplementedException();
}
else
{
throw new NotImplementedException();
}
}
}
}
if (line == null)
{
//line = LTTextLineHorizontal(laparams.word_margin)
//line.add(obj0)
}
yield return(line);
}
/// <summary>
/// https://github.com/pdfminer/pdfminer.six/blob/f389b97923c7a847bc9c6f4c3374951e1a7ff764/pdfminer/layout.py#L705
/// </summary>
public IEnumerable <IEnumerable <TextBlock> > group_textboxes(LAParams laparams, IEnumerable <object> boxes)
{
throw new NotImplementedException();
}
/// <summary>
/// https://github.com/pdfminer/pdfminer.six/blob/f389b97923c7a847bc9c6f4c3374951e1a7ff764/pdfminer/layout.py#L786
/// </summary>
/// <param name="laparams"></param>
public void analyze(Page page, LAParams laparams)
{
// textobjs is a list of LTChar objects, i.e.
// it has all the individual characters in the page.
var textobjs = page.Letters;
//(textobjs, otherobjs) = fsplit(lambda obj: isinstance(obj, LTChar), self)
// for obj in otherobjs:
// obj.analyze(laparams)
if (textobjs.Count == 0)
{
return;
}
var textlines = group_objects(laparams, textobjs);
IEnumerable <TextLine> empties;
// (empties, textlines) = fsplit(lambda obj: obj.is_empty(), textlines)
var lu = textlines.ToList().ToLookup(obj => obj.IsEmpty());
(empties, textlines) = (lu[true], lu[false]);
// for obj in empties:
// obj.analyze(laparams)
var textboxes = group_textlines(laparams, textlines);
if (float.IsNaN(laparams.boxes_flow))
{
//for textbox in textboxes:
// textbox.analyze(laparams)
(int, float, float) getKey(TextBlock box)
{
if (box.TextOrientation == TextOrientation.Rotate90 || box.TextOrientation == TextOrientation.Rotate270)
{
return(0, -box.X1(), -box.Y0());
}
else
{
return(1, -box.Y0(), box.X0());
}
}
textboxes = textboxes.OrderBy(box => getKey(box));
}
else
{
int index = 0;
var groups = group_textboxes(laparams, textboxes);
// assigner = IndexAssigner()
foreach (var g in groups)
{
//group.analyze(laparams)
foreach (var b in g)
{
b.SetReadingOrder(index);
index++;
}
}
textboxes = textboxes.OrderBy(box => box.ReadingOrder);
}
//self._objs = textboxes + otherobjs + empties
}
/// <summary>
/// Group neighboring lines to textboxes
/// <para>https://github.com/pdfminer/pdfminer.six/blob/f389b97923c7a847bc9c6f4c3374951e1a7ff764/pdfminer/layout.py#L674</para>
/// </summary>
/// <param name="laparams"></param>
/// <param name="lines"></param>
/// <returns></returns>
public IEnumerable <TextBlock> group_textlines(LAParams laparams, IEnumerable <TextLine> lines)
{
throw new NotImplementedException();
}
