private void FollowLine(ILine start, Shape s, MyLineQueue q, List<ILine> lines)
{
// q.Remove(start);
if (!s.AddPoint(start.Point1))
return;
List<ILine> l = new List<ILine>();
for (int i = 0; i < lines.Count; i++)
{
if (!lines[i].IsCongruentTo(start))
{
if (lines[i].HasPoint(start.Point2))
{
if (start.Point2 != lines[i].Point1)
{
lines[i] = Line.Flip(lines[i]);
}
l.Add(lines[i]);
}
}
}
if (l.Count == 1)
{
FollowLine(l[0], s, q, lines);
}
else
{
int iR = -1;
int iL = -1;
int iU = -1;
for (int i = 0; i < l.Count; i++)
{
switch (start.RelativeDirection(l[i]))
{
case Line.Direction.Right: iR = i; break;
case Line.Direction.Left: iL = i; break;
case Line.Direction.Up: iU = i; break;
case Line.Direction.Down: iU = i; break;
case Line.Direction.Undef: iU = i; break;
default: break;
}
}
if (iR > -1)
{
if (iU > -1)
q.Enqueue(l[iU], shapes);
if (iL > -1)
q.Enqueue(l[iL], shapes);
FollowLine(l[iR], s, q, lines);
}
else if (iU > -1)
{
if (iL > -1)
q.Enqueue(l[iL], shapes);
FollowLine(l[iU], s, q, lines);
}
else if (iL > -1)
{
FollowLine(l[iL], s, q, lines);
}
}
return;
}
