public static VVector2D Rotation(VVector2D v1, float angle)
{
double theta = angle * Math.PI / 180;
return(new VVector2D((float)(v1.X * Math.Cos(theta) - v1.Y * Math.Sin(theta)), (float)(v1.X * Math.Sin(theta) + v1.Y * Math.Cos(theta))));
//(a_1 cos 𝜃−a_2 sin 𝜃, a_1 sin 𝜃+a_2 cos 𝜃);
}
public static float operatorscale(VVector2D v1)
{
float mathsqrt;
mathsqrt = (float)Math.Sqrt((Math.Pow(v1.X, 2) + Math.Pow(v1.Y, 2)));
return(mathsqrt);
}
public static VVector2D normalize(VVector2D v1)
{
float mathsqrt;
mathsqrt = (float)Math.Sqrt((Math.Pow(v1.X, 2) + Math.Pow(v1.Y, 2)));
return(new VVector2D(v1.X / mathsqrt, v1.Y / mathsqrt));
}
public static double Dot(VVector2D v1, VVector2D v2)
{
//if(dot>360)
//{
// throw new DivideByZeroException();
//}
double innersum = v1.X * v2.X + v1.Y * v2.Y;
double vLength = operatorscale(v1) * operatorscale(v2);
double theta = innersum / vLength;
double innerD = (double)(Math.Acos(theta) * (180 / Math.PI));
return(innerD);
}
static void Main(string[] args)
{
VVector2D v1 = new VVector2D(5f, 7f);
VVector2D v2 = new VVector2D(0f, 1f);
VVector2D v3 = new VVector2D(1f, 1f);
// v1.Disp();
// v2.Disp();
// v3.Disp();
// VVector2D.vectorCopy();
// v1.innerVector()
Console.WriteLine($"두벡터의내적{VVector2D.innerVector(v1,v2)}");
Console.WriteLine($"두벡터의코사인{VVector2D.cosDot(v1, v2)}");
Console.WriteLine($"두벡터의각{VVector2D.Dot(v1, v2)}");
VVector2D.Rotation(v1, 135);
v1.Disp();
Console.WriteLine($"회전시킨벡터{VVector2D.Rotation(v1,135)}");
}
public static VVector2D vectorCopy(VVector2D v1)//,VVector2D v2)
{
// v1.X = v2.X;
// v1.Y = v2.Y;
return(new VVector2D(v1.X, v1.Y));
}
public static VVector2D Ysymmetry(VVector2D v1)
{
return(new VVector2D(v1.X * -1, v1.Y));
}
public static VVector2D Xsymmetry(VVector2D v1)
{
return(new VVector2D(v1.X, v1.Y * -1));
}