public GridLineEnumerable(Definition.Sudoku sudoku, Definition.LineType lineType)
{
if (sudoku == null)
{
throw new ArgumentNullException("sudoku");
}
this.sudoku = sudoku;
this.lineType = lineType;
}
public static int GetLayer(int index, Definition.LineType lineType)
{
switch (lineType)
{
case Definition.LineType.Row: return(index / 3);
case Definition.LineType.Column: return(index % 3);
default: throw new NotImplementedException();
}
}
private static int GetLayerWithOppositeLineType(int index, Definition.LineType oppositeLineType)
{
switch (oppositeLineType)
{
case Definition.LineType.Row: return(index % 3);
case Definition.LineType.Column: return(index / 3);
default: throw new NotImplementedException();
}
}
private Definition.LineType getOppositeLineType(Definition.LineType sourceLineType)
{
switch (sourceLineType)
{
case Definition.LineType.Row:
return(Definition.LineType.Column);
case Definition.LineType.Column:
return(Definition.LineType.Row);
default: throw new NotImplementedException();
}
}
private int getSudokuLineIndex(int gridLineIndex, int gridIndex, Definition.LineType lineType)
{
switch (lineType)
{
case Definition.LineType.Row:
return((gridIndex / 3) * 3 + gridLineIndex);
case Definition.LineType.Column:
return((gridIndex % 3) * 3 + gridLineIndex);
default: throw new InvalidOperationException(lineType.ToString());
}
}
private IEnumerable <Definition.Line> Iterator(Definition.Sudoku sudoku, Definition.LineType lineType)
{
switch (lineType)
{
case Definition.LineType.Row:
return(sudoku.Rows);
case Definition.LineType.Column:
return(sudoku.Columns);
case Definition.LineType.Both:
return(sudoku.Rows.Concat(sudoku.Columns));
default: throw new NotImplementedException();
}
}
public static void GetOtherGrids(this Definition.Grid sourceGrid, Definition.LineType gridLineType, out Definition.Grid otherGrid1, out Definition.Grid otherGrid2)
{
int currentLayer = GetLayerWithOppositeLineType(sourceGrid.Index, gridLineType);
switch (gridLineType)
{
case Definition.LineType.Row:
{
switch (currentLayer)
{
case 0:
{
sourceGrid.TryGetAdjacentGrid(GridAdjacentDirection.Right, out otherGrid1);
otherGrid1.TryGetAdjacentGrid(GridAdjacentDirection.Right, out otherGrid2);
}
break;
case 1:
{
sourceGrid.TryGetAdjacentGrid(GridAdjacentDirection.Left, out otherGrid1);
sourceGrid.TryGetAdjacentGrid(GridAdjacentDirection.Right, out otherGrid2);
}
break;
case 2:
{
sourceGrid.TryGetAdjacentGrid(GridAdjacentDirection.Left, out otherGrid2);
otherGrid2.TryGetAdjacentGrid(GridAdjacentDirection.Left, out otherGrid1);
}
break;
default: throw new NotImplementedException();
}
}
break;
case Definition.LineType.Column:
{
switch (currentLayer)
{
case 0:
{
sourceGrid.TryGetAdjacentGrid(GridAdjacentDirection.Down, out otherGrid1);
otherGrid1.TryGetAdjacentGrid(GridAdjacentDirection.Down, out otherGrid2);
}
break;
case 1:
{
sourceGrid.TryGetAdjacentGrid(GridAdjacentDirection.Up, out otherGrid1);
sourceGrid.TryGetAdjacentGrid(GridAdjacentDirection.Down, out otherGrid2);
}
break;
case 2:
{
sourceGrid.TryGetAdjacentGrid(GridAdjacentDirection.Up, out otherGrid2);
otherGrid2.TryGetAdjacentGrid(GridAdjacentDirection.Up, out otherGrid1);
}
break;
default: throw new NotImplementedException();
}
}
break;
default: throw new NotImplementedException();
}
}
public static IEnumerable <Definition.Element> GetElementsInCurrentGridLine(this Definition.Grid sourceGrid, int layerIndex, Definition.LineType lineType)
{
IEnumerable <Definition.GridLine> lines;
switch (lineType)
{
case Definition.LineType.Row:
lines = sourceGrid.Rows;
break;
case Definition.LineType.Column:
lines = sourceGrid.Columns;
break;
default: throw new NotImplementedException();
}
return(lines.Skip(layerIndex).First().Elements);
}
/// <param name="skipIndex">line index to skip</param>
public static IEnumerable <Definition.Element> GetElementsInOtherGridLine(this Definition.Grid sourceGrid, int skipIndex, Definition.LineType lineType)
{
IEnumerable <Definition.GridLine> lines;
switch (lineType)
{
case Definition.LineType.Row:
lines = sourceGrid.Rows;
break;
case Definition.LineType.Column:
lines = sourceGrid.Columns;
break;
default: throw new NotImplementedException();
}
foreach (var line in lines)
{
if (line.Index != skipIndex)
{
foreach (var element in line.Elements)
{
yield return(element);
}
}
}
}
