/// <summary>
/// Checks nonogram for obvious errors related to specified tile.
/// </summary>
/// <param name="row">Row index of tile</param>
/// <param name="column">Column index of tile</param>
/// <returns>True if error was found.</returns>
private bool Error(int row, int column)
{
int lineSum = _ng.RowSum(row);
for (int i = 0; i < _ng.Width; i++)
{
if (_grid[row][i].HasValue && _grid[row][i].Value)
{
lineSum--;
}
if (lineSum < 0)
{
return(true);
}
}
lineSum = _ng.ColumnSum(column);
for (int i = 0; i < _ng.Height; i++)
{
if (_grid[i][column].HasValue && _grid[i][column].Value)
{
lineSum--;
}
if (lineSum < 0)
{
return(true);
}
}
if (_grid[row].All(x => x.HasValue))
{
int num = 0;
List <int> nums = new List <int>();
for (int i = 0; i < _ng.Width; i++)
{
if (_grid[row][i].HasValue && _grid[row][i].Value)
{
num++;
}
else
{
if (num != 0)
{
nums.Add(num);
}
num = 0;
}
}
if (num != 0)
{
nums.Add(num);
}
for (int i = 0; i < nums.Count; i++)
{
if (nums[i] != _ng.GetRowNum(row, i))
{
return(true);
}
}
if (_ng.GetRowNum(row, nums.Count) != 0)
{
return(true);
}
}
if (_grid.All(x => x[column].HasValue))
{
int num = 0;
List <int> nums = new List <int>();
for (int i = 0; i < _ng.Height; i++)
{
if (_grid[i][column].HasValue && _grid[i][column].Value)
{
num++;
}
else
{
if (num != 0)
{
nums.Add(num);
}
num = 0;
}
}
if (num != 0)
{
nums.Add(num);
}
for (int i = 0; i < nums.Count; i++)
{
if (nums[i] != _ng.GetColumnNum(column, i))
{
return(true);
}
}
if (_ng.GetColumnNum(column, nums.Count) != 0)
{
return(true);
}
}
return(false);
}
public void RowSumTest()
{
Assert.AreEqual(4, ng.RowSum(0));
Assert.AreEqual(3, ng.RowSum(3));
}
