for every cell in the grid of 'val' fill all cells
        around it to de noise the grid

def denoise_grid(self, val, expand=1):
        """
        for every cell in the grid of 'val' fill all cells
        around it to de noise the grid
        """
        
        updated_grid = [[self.grd.get_tile(y,x) \
                        for x in range(self.grd.grid_width)] \
                        for y in range(self.grd.grid_height)]
        for row in range(self.grd.get_grid_height() - expand):
            for col in range(self.grd.get_grid_width() - expand):
                updated_grid[row][col] = self.grd.get_tile(row,col)  # set original point
                if self.grd.get_tile(row,col) == val:
                    for y in range(-expand, expand):
                        for x in range(-expand, expand):
                            new_x = col+x
                            new_y = row+y
                            if new_x < 0: new_x = 0
                            if new_y < 0: new_y = 0
                            if new_x > self.grd.get_grid_width() - 1: new_x = self.grd.get_grid_width() - 1
                            if new_y > self.grd.get_grid_height() - 1: new_y = self.grd.get_grid_height() - 1
                            # randomly NOT denoise to make interesting edges
                            if expand > 0: 
                                if randint(1,expand * 2) > (expand+1):
                                    updated_grid[new_y][new_x] = val
                            else:
                                updated_grid[new_y][new_x] = val
                        
        
        self.grd.replace_grid(updated_grid)