public static LayoutElement NewRow(IEnumerable<LayoutElement> nodes,
LayoutElementType type = LayoutElementType.Row)
{
RectangleF dummyBounds = new RectangleF(0,0,1,1);
var e = new LayoutElement(type, dummyBounds, null, nodes);
// set bounds
if (!nodes.IsEmpty())
{
e.Text = nodes.Select(x => x.Text).Where(x => !String.IsNullOrEmpty(x)).ElementsToStringS(delim: " ");
e.SetBoundsFromNodes(false);
}
return e;
}
void DetectRowBounds(PageLayout cbi, Blob[] blobs)
{
if (blobs.Length == 0) { return; }
if (cbi.Bounds == Rectangle.Empty) { return; }
List<LayoutElement> rows = new List<LayoutElement>();
LayoutElement currentRow = null;
// Attempt drawing lines between the rows.
for (int y = cbi.Bounds.Top; y < cbi.Bounds.Bottom; y++)
{
Rectangle rowRect = new Rectangle(cbi.Bounds.Left, y, cbi.Bounds.Width, 1);
var blobsInRow = blobs.Where(b => b.Rectangle.IntersectsWith(rowRect));
if (blobsInRow.FirstOrDefault() == null)
{
// Empty row detected. Commit current row (if any)
TryAddRow(rows, currentRow);
currentRow = null;
}
else
{
// Start new row if needed
if (currentRow == null)
{
currentRow = new LayoutElement();
currentRow.Type = LayoutElementType.Row;
}
currentRow.Children.AddRange(blobsInRow.Select(x => LayoutElement.NewWord(cbi.PageSize, x.Rectangle)));
// Advance to test the next empty space
// TODO: beware of off-by-1
//y = currentRow.Bounds.Bottom - 1;
}
}
// Add row at the end
TryAddRow(rows, currentRow);
FindAndRemoveHeaderAndFooter(cbi, rows);
cbi.Children = rows;
cbi.SetBoundsFromNodes(true);
}
void TryAddRow(List<LayoutElement> rows, LayoutElement currentRow)
{
if (currentRow == null) { return; }
currentRow.Children = currentRow.Children.Distinct().ToList();
currentRow.SetBoundsFromNodes(false);
rows.Add(currentRow);
}
public static LayoutElement NewWord(Size pageSize, Rectangle bounds, String text = null)
{
RectangleF unitBounds = GetUnitBounds(pageSize, bounds);
var e = new LayoutElement(LayoutElementType.Word, unitBounds, text);
return e;
}
bool StartsNewColumn(LayoutElement a, LayoutElement b)
{
return b.UnitBounds.Bottom <= a.UnitBounds.Top &&
b.UnitBounds.Left > a.UnitBounds.Right;
}
bool StartsNewRow(LayoutElement prev, LayoutElement cur)
{
// Normal case: next row
// QQ: do rows ever overlap?
if (prev.UnitBounds.Bottom <= cur.UnitBounds.Top) { return true; }
// Special case: next column
if (prev.UnitBounds.Top >= cur.UnitBounds.Bottom) { return true; }
return false;
}