CheckLinevLine()

static Vector2[] Terraria.Collision.CheckLinevLine ( Vector2 a1, Vector2 a2, Vector2 b1, Vector2 b2 )

inlinestatic

Definition at line 40 of file Collision.cs.

    {
        if (a1.Equals(a2) && b1.Equals(b2))
        {
            if (a1.Equals(b1))
            {
                return new Vector2[1] { a1 };
            }
            return new Vector2[0];
        }
        if (b1.Equals(b2))
        {
            if (PointOnLine(b1, a1, a2))
            {
                return new Vector2[1] { b1 };
            }
            return new Vector2[0];
        }
        if (a1.Equals(a2))
        {
            if (PointOnLine(a1, b1, b2))
            {
                return new Vector2[1] { a1 };
            }
            return new Vector2[0];
        }
        float num = (b2.X - b1.X) * (a1.Y - b1.Y) - (b2.Y - b1.Y) * (a1.X - b1.X);
        float num2 = (a2.X - a1.X) * (a1.Y - b1.Y) - (a2.Y - a1.Y) * (a1.X - b1.X);
        float num3 = (b2.Y - b1.Y) * (a2.X - a1.X) - (b2.X - b1.X) * (a2.Y - a1.Y);
        if (!(0f - Epsilon < num3) || !(num3 < Epsilon))
        {
            float num4 = num / num3;
            float num5 = num2 / num3;
            if (0f <= num4 && num4 <= 1f && 0f <= num5 && num5 <= 1f)
            {
                return new Vector2[1]
                {
                    new Vector2(a1.X + num4 * (a2.X - a1.X), a1.Y + num4 * (a2.Y - a1.Y))
                };
            }
            return new Vector2[0];
        }
        if ((0f - Epsilon < num && num < Epsilon) || (0f - Epsilon < num2 && num2 < Epsilon))
        {
            if (a1.Equals(a2))
            {
                return OneDimensionalIntersection(b1, b2, a1, a2);
            }
            return OneDimensionalIntersection(a1, a2, b1, b2);
        }
        return new Vector2[0];
    }

References Terraria.Collision.Epsilon, Terraria.Collision.OneDimensionalIntersection(), and Terraria.Collision.PointOnLine().

Referenced by Terraria.GameContent.PortalHelper.RemoveIntersectingPortals().