public Vec2 toVector(Point2D v){
  return new Vec2(toMeters(v.getX()),toMeters(-v.getY()));
}

public Vec2 toVector ( Point2D v ) { return new Vec2 ( toMeters ( v . getX ( ) ) , toMeters ( - v . getY ( ) ) ) ; }
converts a vector of type point2d to vector of type vec2
