private static Line MoveLineLeft(int line)
{
var levels = BitBoardHandler.ToLevels((Line)line);
for (int i = 0; i < 3; ++i)
{
int j = i + 1;
while (j < 4 && levels[j] == 0)
{
++j;
}
if (j >= 4)
{
break;
}
if (levels[i] == 0)
{
levels[i] = levels[j];
levels[j] = 0;
--i;
}
else if (levels[i] == levels[j])
{
if (levels[i] != LevelMask)
{
++levels[i];
}
levels[j] = 0;
}
}
return(BitBoardHandler.ToLine(levels));
}
private static void CacheLineScores(int line)
{
var levels = BitBoardHandler.ToLevels((Line)line);
int score = 0;
for (int i = 0; i < 4; ++i)
{
int level = levels[i];
if (level >= 2)
{
score += (level - 1) * (1 << level);
}
}
lineScores[line] = score;
}