public void Set(T obj, Int32 x, Int32 y)
{
if (x >= 0 && y >= 0)
{
positives.AddOrReplace(obj, x, y);
}
else if (x < 0 && y >= 0)
{
negativoPositive.AddOrReplace(obj, 1 - x, y);
}
else if (x >= 0 && y < 0)
{
positivoNegative.AddOrReplace(obj, x, 1 - y);
}
else if (x < 0 && y < 0)
{
negatives.AddOrReplace(obj, 1 - x, 1 - y);
}
}