Shape RecognizeBoxOrLines(DragState state, out bool potentialSelection)
{
// Okay so this is a rectangular recognizer that only sees things at
// 45-degree angles.
List<Section> sections1 = BreakIntoSections(state);
List<Section> sections2 = new List<Section>(sections1);
// Figure out if a box or a line string is a better interpretation
EliminateTinySections(sections1, 10);
LineOrArrow line = InterpretAsPolyline(state, sections1);
Shape shape = line;
// Conditions to detect a box:
// 0. If both endpoints are anchored, a box cannot be formed.
// continued below...
EliminateTinySections(sections2, 10 + (int)(sections1.Sum(s => s.LengthPx) * 0.05));
if (line.ToAnchor == null || line.FromAnchor == null || line.FromAnchor.Equals(line.ToAnchor))
shape = (Shape)TryInterpretAsBox(sections2, (line.FromAnchor ?? line.ToAnchor) != null, out potentialSelection) ?? line;
else
potentialSelection = false;
return shape;
}
