Hello world - Formule Utili

//Distanza tra due punti
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double Distance(Vect2d p1, Vect2d p2)
{
  double dx = p2.x - p1.x;
  double dy = p2.y - p1.y;

  return sqrt((double)dx*dx + dy*dy);
};

//Distanza tra un punto e un segmento
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double DistanceToLine(Vect2d lineP1, Vect2d lineP2, Vect2d point)
{
  double normalLength = _hypot(lineP2.x - lineP1.x, lineP2.y - lineP1.y);
  
double distance = (double)((point.x - lineP1.x) * (lineP2.y - lineP1.y) - (point.y - lineP1.y) * (lineP2.x - lineP1.x)) / normalLength;

  return abs(distance);
}