// �O��(outer product, cross product, vector product) : a �~ b �� |a||b|sin�� �� ax by - ay bx
// zero if two vectors run parallelly
public double CrossProduct(GPoint p)
{
return(X * p.Y - Y * p.X);
}
public bool IsEqual(GPoint p)
{
return((Math.Abs(X - p.X) < Double.Epsilon) && (Math.Abs(Y - p.Y) < Double.Epsilon));
}
// ����(inner product, dot product, scalar product) : a�Eb �� |a||b|cos�� �� ax bx + ay by
// zero if two vectors run orthogonally
public double DotProduct(GPoint p)
{
return(X * p.X + Y * p.Y);
}
public double Distance(GPoint p)
{
return((this - p).Length());
}