public void UpdateDotSelection(Dot dot, List <Dot> currentDotPath)
{
if (currentDotPath.Count == 0)
{
// highlight a new dot
dot.Activate();
currentDotPath.Add(dot);
}
else
{
// highlight a new dot on the path if the dot is selectable according to the game rules
Dot lastDot = currentDotPath[currentDotPath.Count - 1];
int lastDotX = lastDot.Column;
int lastDotY = lastDot.Row;
int newDotX = dot.Column;
int newDotY = dot.Row;
if (
lastDot != dot && // not same as last dot
lastDot.DotType == dot.DotType && // same type of dot
!currentDotPath.Contains(dot) && // not already in current path
Mathf.Abs(newDotX - lastDotX) <= 1 && // only one step away on the board horizontally
Mathf.Abs(newDotY - lastDotY) <= 1 && // only one step away on the board vertically
(newDotX == lastDotX || newDotY == lastDotY) // only horizontal/vertical dot connections are allowed
)
{
dot.Activate();
currentDotPath.Add(dot);
}
}
// display the path as connected lines
currentPathDisplay.positionCount = currentDotPath.Count;
currentPathDisplay.enabled = currentPathDisplay.positionCount > 0;
currentPathDisplay.SetPositions(currentDotPath.Select(d => d.transform.position).ToArray());
}