/// <summary>
/// Checks in every direction around the centerPos for atleast
/// 4 animal tiles of the same type in a row. Animal rows that are found
/// are marked matched at the tile level.
/// </summary>
/// <param name="centerPos"></param>
public void CheckForMatches(IntVector2 centerPos)
{
if (!IsValidIndex(centerPos))
{
return;
}
AnimalTile centerAnimal = GetAnimal(centerPos);
if (AnimalTile.IsNullOrMoving(centerAnimal))
{
return;
}
//Match count for each direction.
int[] matchCounts = { 1, 1, 1, 1, 0, 0, 0, 0 };
//Count matches found extending out from (x,y) in each direction.
foreach (SwipeDirection direction in Enum.GetValues(typeof(SwipeDirection)))
{
IntVector2 currPos = GetNextNeighbor(centerPos, direction);
AnimalTile currAnimal = GetAnimal(currPos);
//While neighbor in direction is the same as center. Add to count and move to next
while (!AnimalTile.IsNullOrMoving(currAnimal) && AnimalTile.IsSameType(centerAnimal, currAnimal))
{
matchCounts[(int)direction]++;
currPos = GetNextNeighbor(currPos, direction);
currAnimal = GetAnimal(currPos);
}
}
//Only iterate: North, NorthEast, East, SouthEast. The rest can be considered part of these.
for (int i = 0; i < 4; i++)
{
IntVector2 currStartPos = new IntVector2(centerPos.x, centerPos.y);
SwipeDirection currDirection = (SwipeDirection)i;
int currLength = 0;
//Center is not start of match
SwipeDirection invertedDirection = InputController.InvertDirection(currDirection);
//Find correct start, and how long it really is.
currStartPos = GetNextNeighbor(currStartPos, invertedDirection, matchCounts[i + 4]);
currLength += matchCounts[i + 4] + matchCounts[i];
//If the row is 4 or longer and has an unmatched animal in it. Remove it.
if (currLength >= MinMatch && DoesRowHaveNonMatched(currStartPos, currLength, currDirection))
{
IsReady = false;
//Set them marked in the board. And give player points.
MarkRowMatched(currStartPos, currLength, currDirection);
playerScore.AddPoints(currStartPos, currLength, currDirection);
}
}
}
