/// <summary>
/// Rotates this by "a" degrees and returns the result
/// </summary>
/// <param name="degrees"></param>
/// <param name="result"></param>
/// <returns></returns>
public JJVector rotate(double degrees, JJVector result)
{
result.set(this);
result.rotateSelf(degrees);
return(result);
}
/// <summary>
/// returns the distance beteween the two vectors. Will always be positive.Same as minus(v).mag().
/// </summary>
/// <param name="v"></param>
/// <returns></returns>
// Useful Functions
public double dist(JJVector v)
{
var dx = mX - v.x();
var dy = mY - v.y();
return(Math.Sqrt(dx * dx + dy * dy));
}
/// <summary>
/// Computes the velocity vector, which is just the vector pointing
/// in the same direction as "this", but with both time and distance
/// scaled, such that result.t() == 1. (See below for the
/// usefulness of the second form.)
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
public JJVector velocity(JJVector result)
{
mult(1.0d / mT, result);
result.set_t(1.0);
return(result);
}
public static JJVector Polar(double r, double a, double t)
{
JJVector pR = new JJVector(r, 0, t);
pR.rotateSelf(a);
return(pR);
}
public void set(JJVector v) => set(v.mX, v.mY, v.mT);
public JJVector(JJVector v) : this(v.mX, v.mY, v.mT)
{
}
/// <summary>
/// returns the "unit-ised" vector of this. This function works in the same way as plus, minus and mult.
/// </summary>
/// <param name="result"></param>
/// <returns></returns>
public JJVector unit(JJVector result)
{
var invMag = 1.0d / mag();
return(mult(invMag, result));
}
public JJVector mult(double k, JJVector result)
{
result.set(mX * k, mY * k, mT * k);
return(result);
}
public JJVector minus(JJVector v)
{
return(minus(v, new JJVector()));
}
public JJVector minus(JJVector v, JJVector result)
{
result.set(mX - v.x(), mY - v.y(), mT - v.t());
return(result);
}
public JJVector plus(JJVector v)
{
return(plus(v, new JJVector()));
}
public JJVector plus(JJVector v, JJVector result)
{
result.set(mX + v.x(), mY + v.y(), mT + v.t());
return(result);
}
/// <summary> /// /// </summary> /// <param name="v"></param> /// <returns>returns this . v, i.e. the dot product of this and v.</returns> public double dot(JJVector v) => mX *v.x() + mY * v.y();