private int recursiveGetSpread(List <Cell> curWordList, RowColPair dir, int lastScore, int spreadSum)
{
if (curWordList.Count == 1)
{
return(spreadSum);
}
spreadSum += getSpreadForLetterPair(curWordList[0], curWordList[1], ref dir, ref lastScore);
curWordList.RemoveAt(0);
return(recursiveGetSpread(curWordList, dir, lastScore, spreadSum));
}
private RowColPair getNextCell(RowColPair cell, string word)
{
int count = 0;
while (++count < 50)
{
RowColPair newCell = getRandomAdjacentCell(cell);
if (cellIsValid(newCell, word))
{
return(newCell);
}
}
return(null);
}
internal bool insertWord(string word)
{
//start with a random location
RowColPair cell = new RowColPair(Utils.RandomNumber(0, dim), Utils.RandomNumber(0, dim));
//we're building the level from the final state to the initial state, so iterate over the letters in reverse order
for (int i = word.Length - 1; i >= 0; --i)
{
cell = getNextCell(cell, word);
//Got into a bad state, so bail and start over!
if (cell == null)
{
return(false);
}
insertCharacter(word[i], word, cell);
}
return(true);
}
private void insertCharacter(char ch, string word, RowColPair cell)
{
if (board[cell.Row, cell.Col] != null)
{
//raise the characters to make room
int curRow = dim - 1;
while (curRow != cell.Row)
{
if (board[curRow, cell.Col] == null && board[curRow - 1, cell.Col] != null)
{
board[curRow, cell.Col] = board[curRow - 1, cell.Col];
board[curRow - 1, cell.Col] = null;
}
--curRow;
}
}
board[cell.Row, cell.Col] = new Cell()
{
c = ch.ToString(), Word = word, h = hintIndex--
};
}
private int getSpreadForLetterPair(Cell cell1, Cell cell2, ref RowColPair dir, ref int lastScore)
{
int rowDiff = cell1.loc.Row - cell2.loc.Row;
int colDiff = cell1.loc.Col - cell2.loc.Col;
RowColPair newDir = new RowColPair(rowDiff, colDiff);
bool isDiag = Math.Abs(newDir.Col) == 1 && Math.Abs(newDir.Row) == 1;
if (dir == null)
{
lastScore = (isDiag ? 5 : 1);
dir = newDir;
}
else
{
if (dir.equals(newDir))
{
lastScore--;
}
}
return(lastScore);
}
//returns 1 of 9 possible locations
private RowColPair getRandomAdjacentCell(RowColPair cell)
{
int pos = Utils.RandomNumber(0, 9);
switch (pos)
{
case 0:
return(new RowColPair(cell.Row - 1, cell.Col - 1));
case 1:
return(new RowColPair(cell.Row - 1, cell.Col));
case 2:
return(new RowColPair(cell.Row - 1, cell.Col + 1));
case 3:
return(new RowColPair(cell.Row, cell.Col - 1));
case 4:
return(new RowColPair(cell.Row, cell.Col));
case 5:
return(new RowColPair(cell.Row, cell.Col + 1));
case 6:
return(new RowColPair(cell.Row + 1, cell.Col - 1));
case 7:
return(new RowColPair(cell.Row + 1, cell.Col));
case 8:
return(new RowColPair(cell.Row + 1, cell.Col + 1));
default:
throw new Exception("Should not get here!");
}
}
private bool cellIsValid(RowColPair cell, string word)
{
//check it's inside grid
if (cell.Row >= dim || cell.Row < 0 || cell.Col >= dim || cell.Col < 0)
{
return(false);
}
//check there is no null space immediately below the cell
// -- you can only build up on top of other blocks
if (cell.Row > 0 && board[cell.Row - 1, cell.Col] == null)
{
return(false);
}
//can push up ONLY if there is space - if top space is null, then there's room. If not, return false
if (board[dim - 1, cell.Col] != null)
{
return(false);
}
//AND if no Cells above contain the current word (or it will be unsolvable!)
for (int row = dim - 1; row >= cell.Row; --row)
{
//null cells are good for business, move along
if (board[row, cell.Col] == null)
{
continue;
}
//not valid!
if (board[row, cell.Col].Word.Equals(word))
{
return(false);
}
}
return(true);
}
internal bool equals(RowColPair p)
{
return(Row == p.Row && Col == p.Col);
}