private bool IsValidSlot(TileSlot slot, Tile tile)
{
// flag to explore for adjacent files as we check for
// other failure conditions
bool adjacent = false;
// if the target slot has a tile to the North
// and if that tile has incompatible borders,
// then reject
if (slot.hasN() && slot.N.hasTile())
{
adjacent = true;
if(slot.N.tile.borders.S != tile.borders.N)
return false;
}
if(slot.hasS() && slot.S.hasTile())
{
adjacent = true;
if(slot.S.tile.borders.N != tile.borders.S)
return false;
}
if(slot.hasE() && slot.E.hasTile())
{
adjacent = true;
if (slot.E.tile.borders.W != tile.borders.E)
return false;
}
if(slot.hasW() && slot.W.hasTile())
{
adjacent = true;
if(slot.W.tile.borders.E != tile.borders.W)
return false;
}
// if no adjacent tiles were found, then the slot is not valid
if(!adjacent)
return false;
return true;
}
