/// <summary>
/// A pretty simple method to check if there are certain cells that must be filled in regardless of clue position
/// </summary>
/// <remarks>
/// If the clues are positioned as far left as they can go and then as far right as they can go there may be
/// certain cells that will always be covered.
/// For example, in an element of 15 cells a clue of length 10 will always cover cells 5 to 9
/// </remarks>
private static int Overlap(Grid grid, Clues clues, Blocks blocks, Spaces spaces, int element, int elementLength, bool isRow)
{
int filled = 0;
int firstFree = grid.GetFirstFreeCell(element, isRow);
int lastFree = grid.GetLastFreeCell(element, isRow);
int rowToUpdate;
int colToUpdate;
//For a given space, find the clues that HAVE to be in that space and check limits
for (int spaceNo = 0; spaceNo < spaces.getSpaceCount(); spaceNo++)
{
Clues cluesToTest = FindFewestClues(spaces, clues, spaceNo);
}
for (int clueNo = 0; clueNo < clues.GetClueCount(); clueNo++)
{
//this needs adapted to take account of filled cells
int endClueLeft = firstFree - 1 + clues.GetClueLength(0, clueNo);
int startClueRight = lastFree + 1 - clues.GetClueLength(clueNo, clues.GetClueCount() - 1);
if (startClueRight <= endClueLeft)
{
for (int cellNo = startClueRight; cellNo <= endClueLeft; cellNo++)
{
rowToUpdate = (isRow) ? element : cellNo;
colToUpdate = (isRow) ? cellNo : element;
if (Update(grid, colToUpdate, rowToUpdate, clues.getClue(clueNo).Colour))
{
filled += 1;
}
}
}
}
return(filled);
}
