text: // Vector Math
  
  #include <windows.h>
  #include <objbase.h>
  #include <math.h>
  #include <gdiplus.h>
  using namespace Gdiplus;
  
  extern float DotProduct(PointF v1,PointF v2);
  extern float Magnitude(PointF v);
  extern PointF Normalize(PointF vPoint);
  