private static void ClearMentions(Util.Set <IParse> mentions, IParse nounPhrase)
{
Util.Span nounPhraseSpan = nounPhrase.Span;
//loop backwards through the set so that we can remove from the end forwards
for (int currentMention = mentions.Count - 1; currentMention > -1; currentMention--)
{
if (mentions[currentMention].Span.Contains(nounPhraseSpan))
{
mentions.Remove(mentions[currentMention]);
}
}
}
/// Input format: each two vectors represents a segment from the beginning.
/// Considering all triangles are filled and non-triangle structure is always empty.
/// Extract the outlines (may have holes) and return the outline.
/// Points in each edge is arranged where their left-side is filled.
/// Notice edges are not in order, but two points in each edge has its order.
public static List <Vector2> ExtractEdge(this List <Vector2> src)
{
var adj = new Dictionary <Vector2, List <Vector2> >();
for (int i = 0; i < src.Count; i += 2)
{
adj.GetOrDefault(src[i]).Add(src[i + 1]);
adj.GetOrDefault(src[i + 1]).Add(src[i]);
}
// Sort the adjacent edges.
foreach (var x in adj)
{
var curVert = x.Key;
var adjList = x.Value;
int Compare(Vector2 va, Vector2 vb)
{
Vector2 da = curVert.To(va);
Vector2 db = curVert.To(vb);
float aa = Mathf.Atan2(da.y, da.x);
float ba = Mathf.Atan2(db.y, db.x);
return(aa <ba ? -1 : aa> ba ? 1 : 0);
}
adjList.Sort(Compare);
}
// output size should not exceeded input size.
var rest = new Util.Set <Edge>(src.Count);
foreach (var vert in src.Distinct().ToList())
{
var adx = adj[vert];
for (int i = 0; i < adx.Count; i++)
{
var from = adx[i];
var to = adx[(i + 1).ModSys(adx.Count)];
// Exclude the edge if triangle edges are arranged clockwise.
if (new Triangle(vert, from, to).area <= 0)
{
continue;
}
// Edges can either appear for 1 or 2 times.
// Because an edge can only be owned by 1 or 2 triangles.
// Use this to extract outlines, including outlines inside.
var edge = new Edge(from, to);
// take up about 200ms time when src.Length == 60000.
if (rest.Contains(edge))
{
rest.Remove(edge);
}
else
{
rest.Add(edge);
}
}
}
var res = new List <Vector2>();
rest.Foreach((i) => { res.Add(i.a); res.Add(i.b); });
return(res);
}