How to calculate left or right vector

[hdn]

I know that 2 vector is perpendicular when x1*x2 + y1*y2 (+ z1*z2) =0, not to mention 3D, just talk about 2D. I still have no ideal how to calculate a left or right vector of a main direction vector. Anyone know how to calculate?

  //prototype
  Vector2 GetLeftVector(Vector2 Direction)
  {
   Vector2 ToTheLeft;
   //??
   return ToTheLeft;
  }
Vector2 GetRightVector(Vector2 Direction)
  {
return GetLeftVector(Direction)*-1.0f;
  }

[keskiverto]

http://en.wikipedia.org/wiki/Rotation_matrix#Common_rotations

[hdn]

Thanks keskiverto, It's just so simple :)

Vector2 GetLeftVector(Vector2 Direction)
  {
   Vector2 ToTheLeft;
   ToTheLeft.X = -Direction.Y;
   ToTheLeft.Y = Direction.X
   return ToTheLeft;
  }