private bool LassoSelect(InqCanvas.StroqCollectedEventArgs e)
{
if (e.Stroq.OldPolylineCusps().Length <= 4 && e.Stroq.Count > 4)
{
Stroq estroq = e.Stroq;
CuspDetector.CuspSet cs = CuspDetector.FeaturePoints(estroq);
Pt[] first = new Pt[cs.pts.Count / 2];
for (int i = 0; i < first.Length; i++)
if (cs.distances[i] > cs.dist / 2)
break;
else first[i] = cs.pts[i];
Pt[] second = new Pt[cs.pts.Count - first.Length];
for (int j = 0; j < second.Length; j++) second[j] = cs.pts[first.Length + j];
Stroq s1 = new Stroq(first);
Stroq s2 = new Stroq(second);
float d1, d2;
s1.OldNearestPoint(s2[-1], out d1);
s2.OldNearestPoint(s1[0], out d2);
if (Math.Min(d1, d2) / Math.Max(estroq.GetBounds().Width, estroq.GetBounds().Height) < 0.3f)
{
StroqCollection stqs = _mathStroqs.HitTest(estroq, 50);
StroqCollection stqs2 = _mathStroqs.HitTest(estroq.Reverse1(), 50);
if (stqs2.Count > stqs.Count)
stqs = stqs2;
stqs.Remove(estroq);
StroqCollection stqs3 = new StroqCollection(stqs.Where((Stroq s) => _mrec.Charreco.Classification(_mrec.Sim[s]) != null));
stqs = stqs3;
Recognition rtemp = _mrec.ClassifyOneTemp(estroq);
if (stqs.Count > 0 && (rtemp == null || !rtemp.alts.Contains(new Recognition.Result(Unicode.S.SQUARE_ROOT))))
{
if (rtemp != null) Console.WriteLine("select recognized for " + rtemp.allograph);
Deselect();
estroq.BackingStroke.DrawingAttributes.Color = Colors.Purple;
Selected.Contents = new StroqSel(stqs, estroq, (Stroq s) => _mrec.Charreco.Classification(_mrec.Sim[s]),
(Recognition r) => _mrec.Sim[r.strokes], inqCanvas.Stroqs);
StroqSel Sel = (StroqSel)Selected.Contents;
HashSet<Recognition> recogs = new HashSet<Recognition>(Sel.AllStroqs.Select((Stroq s) => _mrec.Charreco.Classification(_mrec.Sim[s]))
.Where((Recognition r) => r != null));
if (recogs.Count != 0) showSidebarAlts(recogs, Sel.AllStroqs);
return true;
}
else
{
// Generic additional selections would be called here.
return false;
}
}
}
return false;
}
//BOKANG TODO, check for the tap gesture
public bool isTapGesture(InqCanvas.StroqCollectedEventArgs e)
{
Stroq currentStroq = e.Stroq;
Recognition rtempt = _mrec.ClassifyOneTemp(currentStroq);
if (rtempt != null && rtempt.alts.Contains<Recognition.Result>(Unicode.F.FULL_STOP))
{
return true;
}
return false;
}
private bool ScribbleDelete(InqCanvas.StroqCollectedEventArgs e)
{
bool canBeScribble = e.Stroq.OldPolylineCusps().Length > 4;
if (e.Stroq.OldPolylineCusps().Length == 4)
{
int[] pcusps = e.Stroq.OldPolylineCusps();
Deg a1 = fpdangle(e.Stroq[0], e.Stroq[pcusps[1]], e.Stroq[pcusps[2]] - e.Stroq[pcusps[1]]);
Deg a2 = fpdangle(e.Stroq[pcusps[1]], e.Stroq[pcusps[1]], e.Stroq[pcusps[3]] - e.Stroq[pcusps[1]]);
if (a1 < 35 && a2 < 35)
canBeScribble = e.Stroq.BackingStroke.HitTest(e.Stroq.ConvexHull().First(), 1);
}
if (canBeScribble)
{
IEnumerable<Pt> hull = e.Stroq.ConvexHull();
StroqCollection stqs = inqCanvas.Stroqs.HitTest(hull, 1);
if (stqs.Count > 1)
{
inqCanvas.Stroqs.Remove(stqs);
_mathStroqs.Remove(stqs);
inqCanvas.Stroqs.Remove(e.Stroq);
return true;
}
}
return false;
}
void inqCanvas_StroqCollected(object sender, InqCanvas.StroqCollectedEventArgs e)
{
/* filter out gestures before taking everything else as math */
//BOKANG, check user's tap gesture in order to trigger the animation
/*
if (Selected.Contents != null)
{
if (isTapGesture(e))
{
triggerAnimationForLogicExpression(Selected.Contents);
_mathStroqs.Remove(e.Stroq);
inqCanvas.Stroqs.Remove(e.Stroq);
return;
}
}
* */
/* If we get here, it's a real stroke (not movement), so deselect any selection */
Deselect();
/* check for scribble delete */
if (ScribbleDelete(e)) return;
/* check for lassos/circles around stuff */
if (LassoSelect(e)) return;
_mathStroqs.Add(e.Stroq);
}
