private static PartialResults CheckDiagonals(FourInARowState state)
{
PartialResults summary = new PartialResults();
//// from left bottom to right top
for (Int32 startY = 0, mStartY = FourInARowState.RowCount - WinningCount + 1; startY < mStartY; startY++)
{
FieldContext context = new FieldContext();
for (Int32 x = 0, y = startY, my = FourInARowState.RowCount, mx = FourInARowState.ColumnCount; y < my && x < mx /* && y < state.LastEmptyRow */; x++, y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
for (Int32 startX = 1, mStartX = FourInARowState.ColumnCount - WinningCount + 1; startX < mStartX; startX++)
{
FieldContext context = new FieldContext();
for (Int32 x = startX, y = 0, my = FourInARowState.RowCount, mx = FourInARowState.ColumnCount; y < my && x < mx /* && y < state.LastEmptyRow */; x++, y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
//// from right bottom to left top
for (Int32 startY = 0, mStartY = FourInARowState.RowCount - WinningCount + 1; startY < mStartY; startY++)
{
FieldContext context = new FieldContext();
for (Int32 x = FourInARowState.ColumnCount - 1, y = startY, my = FourInARowState.RowCount; y < my && x >= 0 /* && y < state.LastEmptyRow */; x--, y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
for (Int32 sStartX = FourInARowState.ColumnCount - 2, mStartX = WinningCount - 1; sStartX >= mStartX; sStartX--)
{
FieldContext context = new FieldContext();
for (Int32 x = sStartX, y = 0, my = FourInARowState.RowCount; y < my && x >= 0 /* && y < state.LastEmptyRow */; x--, y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
return(summary);
}
public Int32 Evaluate(IGameState gameState, GamePlayer player)
{
FourInARowState state = (FourInARowState)gameState;
PartialResults summary = new PartialResults();
PartialResults result = CheckColumns(state);
summary.Add(result);
result = CheckRows(state);
summary.Add(result);
result = CheckDiagonals(state);
summary.Add(result);
return(CalculateScore(summary, player));
}
private static PartialResults CheckColumns(FourInARowState state)
{
PartialResults summary = new PartialResults();
for (Int32 x = 0, mx = FourInARowState.ColumnCount; x < mx; x++)
{
FieldContext context = new FieldContext();
for (Int32 y = 0, my = FourInARowState.RowCount; y < my /* && y < state.LastEmptyRow */; y++)
{
ProcessField(state, x, y, context);
}
summary.Add(context.PartialResults);
}
return(summary);
}