internal override bool GetCollisionCircle(CollisionCircle obj)
{
//float rd2 = Pow2(obj.Radius + Width);
//Vector2 ao = obj.Position - Position;
//Vector2 bo = obj.Position - End;
//if (ao.LengthSquared() <= rd2 || bo.LengthSquared() <= rd2) return true;
//if (!(Vector2.Dot(-Line, ao) * Vector2.Dot(Line, bo) >= 0)) return false;
//if ((Line.Y * obj.Position.X + Line.X * obj.Position.Y + Position.X * Line.Y - Position.Y * Line.X)
// / Line.LengthSquared() <= rd2) return true;
if (System.Math.Abs(MathUtilXNA.Cross(obj.Position - Begin, Line) / (Line.Length())) > obj.Radius) return false;
if (Vector2.Dot(Line, obj.Position - Begin) * Vector2.Dot(-Line, obj.Position - End) <= 0) return true;
if (obj.GetCollision(new CollisionPoint(Begin)) || obj.GetCollision(new CollisionPoint(End))) return true;
return false;
}
public CollisionPolygon(Vector2[] v)
{
vertices = (Vector2[])v.Clone();
Trans = true;
temp = new Vector2[v.Length];
float or = 0, ir = float.MaxValue;
float t;
foreach (var item in vertices)
{
t = item.LengthSquared();
or = MathHelper.Max(or, t);
ir = MathHelper.Min(ir, t);
}
or = (float)System.Math.Sqrt(or);
ir = (float)System.Math.Sqrt(ir);
outCircle = new CollisionCircle(or, Position);
inCircle = new CollisionCircle(ir, Position);
}
internal override bool GetCollisionCircle(CollisionCircle obj)
{
return obj.GetCollision(this);
}
internal override bool GetCollisionCircle(CollisionCircle obj)
{
Apply();
if (!outCircle.GetCollision(obj)) return false;
if (inCircle.GetCollision(obj)) return true;
if (GetCollisionPoint(new CollisionPoint(obj.Position))) return true;//円が完全に入っている
for (int i = 0; i < temp.Length; i++)//辺と円が交わる
{
if (Line(i).GetCollision(obj)) return true;
}
foreach (var item in temp)//頂点と円が交わる
{
if (new CollisionPoint(item).GetCollision(obj)) return true;
}
return false;
}
internal override bool GetCollisionCircle(CollisionCircle obj)
{
return Pow2(obj.Radius + Radius) >= (obj.Position - Position).LengthSquared();
}
internal abstract bool GetCollisionCircle(CollisionCircle obj);
//適当
internal override bool GetCollisionCircle(CollisionCircle obj)
{
return obj.Position.X + obj.Radius > Left && obj.Position.X - obj.Radius < Right && obj.Position.Y - obj.Radius < Top && obj.Position.Y + obj.Radius > Bottom;
}