public bool isCrossedBy(Freeline other) {
/* AB = this
* CD = other
*
* AB = sqrt ( (Xb - Xa)² + (Yb - Ya)² ) => AB.distance
* CD.distance
*
* AB * BC => this.segment.distance * this.segment.b.getDistanceFrom(other.segment.a);
* AB * BD => this.segment.distance * this.segment.b.getDistanceFrom(other.segment.b);
*
* CD * DA => other.segment.distance * other.segment.b.getDistanceFrom(this.segment.a);
* CD * DB => other.segment.distance * other.segment.b.getDistanceFrom(this.segment.b);
* if (AB × BC) * (AB × BD) < 0 and
* (CD × DA) * (CD × DB) < 0:
* return True
*
* Debug.Log ("AB * BC = " + abbc);
Debug.Log ("AB * BD = " + abbd);
Debug.Log ("CD * DA = " + cdda);
Debug.Log ("CD * DB = " + cddb);
*/
Segment bc, bd, da, db;
double abbc, abbd, cdda, cddb;
bc = new Segment(this.segment.b, other.segment.a);
bd = new Segment(this.segment.b, other.segment.b);
da = new Segment(other.segment.b, this.segment.a);
db = new Segment(other.segment.b, this.segment.b);
abbc = this.segment.vecto (bc);
abbd = this.segment.vecto (bd);
cdda = other.segment.vecto (da);
cddb = other.segment.vecto (db);
return (abbc * abbd < 0 && cdda * cddb < 0);
}
public bool CreateNewFreeline(Intersection one, Intersection two) {
Freeline newFreeline = new Freeline (one, two);
if (this.freelines.Exists (x => x.Equals (newFreeline)))
return (false);
if (GamePreferences.INSTANCE.ThreeDouble) {
foreach (Freeline freeline in BoardManager.INSTANCE.freelines) {
if (!excluded.Exists(x => x.Equals(freeline))
&& freeline.isCrossedBy(newFreeline))
return (true);
}
}
this.freelines.Add (newFreeline);
Debug.Log ("Freeline ajouté [" + this.freelines.Count + "]");
return false;
}
public bool Equals(Freeline freeline) {
return ((this.segment.a.Equals (freeline.segment.a) && this.segment.b.Equals (freeline.segment.b)) ||
(this.segment.a.Equals(freeline.segment.b) && this.segment.b.Equals(freeline.segment.a)));
}