public static float GetDistance(StraightLine self, Vector2 p)
{
var v = p - self.p;
// 本当は this.Cross(this.dir, v) / this.dir.magnitude だが、DirectionのMagnitudeは1.
return(Mathf.Abs(Vector2Util.Cross(self.dir, v)));
}
public static bool IsCrossing(StraightLine self, LineSegment other)
{
return(Vector2Util.Cross(self.dir, other.p0 - self.p) * Vector2Util.Cross(self.dir, other.p1 - self.p) < 0f);
}
public static bool IsCrossing(StraightLine self, HalfStraightLine other)
{
return(Vector2Util.Cross(self.dir, other.p - self.p) * Vector2Util.Cross(self.dir, other.dir) < 0f);
}
public static bool IsCrossing(StraightLine self, StraightLine other)
{
// a × b == 0 ⇔ a // b
return(!(Mathf.Abs(Vector2Util.Cross(self.dir, other.dir)) < EPS));
}
public static Vector2 GetIntersection(StraightLine self, HalfStraightLine other)
{
var t = GetIntersectionParametric(self.p, self.dir, other.p, other.dir);
return(self.p + t * self.dir);
}
public static Vector2 GetIntersection(StraightLine self, LineSegment other)
{
return(GetIntersectionWithLineSegment(other, self.p, self.dir));
}
