/// <summary>
/// Swap of two units.
/// </summary>
/// <param name="units"></param>
private void SwapTwoUnits(params UnitInfo[] units)
{
if (units == null || units.Length != 2)
{
return;
}
SetGameState(Match3GameStates.Swap);
for (int i = 0; i < 2; i++)
{
UnitsToMove.Add(units[i]);
_unitsPossToCheckMatches.Add(units[i].MPos);
//Replace links for swapped units in the common array of units.
_unitsArray[units[i].MPos.X, units[i].MPos.Y] = units[i == 0 ? 1 : 0];
}
//Replace positions for swapped units.
Position temp = units[0].MPos;
units[0].SetNewPosition(units[1].MPos);
units[1].SetNewPosition(temp);
}
/// <summary>
/// Check for matches.
/// If successful, start displaying the received changes in the units, by performing sequentially game states.
/// </summary>
/// <returns></returns>
public bool CheckForMatches()
{
//Exit if there are no places to check new matches.
if (_unitsPossToCheckMatches.Count == 0)
{
return(false);
}
//Received changes in the units.
List <Position> matchedUnits;
List <PositionVector> fallingUnits;
List <UnitData> newUnits;
_game.DoMatchesPipeline(out matchedUnits, out fallingUnits, out newUnits, _unitsPossToCheckMatches.ToArray());
UnitsToMove.Clear();
_unitsPossToCheckMatches.Clear();
//Exit if there are no new matches found.
if (matchedUnits == null || matchedUnits.Count == 0)
{
return(false);
}
//We keep the places of the matched units and units that are going to fall, to check them for new matches in the future.
foreach (PositionVector posv in fallingUnits)
{
_unitsPossToCheckMatches.Add(posv.From);
}
foreach (Position pos in matchedUnits)
{
_unitsPossToCheckMatches.Add(pos);
}
//Falling units keep their target positions and are added to the list of units to be moved.
foreach (PositionVector pos in fallingUnits)
{
UnitInfo unit = _unitsArray[pos.From.X, pos.From.Y];
unit.SetNewPosition(pos.To);
UnitsToMove.Add(unit);
}
//Matched units are highlighted and take on new positions and colors for rebirth. And they are added to the list of units to be moved (die and reborn).
for (int i = 0; i < newUnits.Count; i++)
{
Position pos = matchedUnits[i];
UnitInfo unit = _unitsArray[pos.X, pos.Y];
unit.SetNewPosition(newUnits[i].Pos);
unit.SetNewUnitIdAndColor(newUnits[i].Id, _colors[newUnits[i].Id]);
unit.ShowShadow();
UnitsToDieAndReborn.Add(unit);
}
//Replacing links to units according to their new positions (in which they have to be after their movements).
foreach (UnitInfo unit in UnitsToDieAndReborn)
{
_unitsArray[unit.MPos.X, unit.MPos.Y] = unit;
}
foreach (UnitInfo unit in UnitsToMove)
{
_unitsArray[unit.MPos.X, unit.MPos.Y] = unit;
}
return(true);
}
