public CheminMathias(GridMathias n_grille, int n_x, int n_y)
 {
     grille = n_grille;
     x      = n_x;
     y      = n_y;
 }
 public CheminMathias(int n_x, int n_y)
 {
     grille = null;
     x      = n_x;
     y      = n_y;
 }
 public PathfindingMathias(int largeur, int hauteur)
 {
     grille = new GridMathias(largeur, hauteur, 0.5f, Origine, (GridMathias grille, int x, int y) => new CheminMathias(grille, x, y));
 }