public override void AddCellBeforeModification(TerrainCell cellBefore)
{
LayerOffsetPair pair;
if (!_layerOffsetPairs.TryGetValue(cellBefore.Position, out pair))
{
CellLayerData data = null;
CellLayerData cellData = cellBefore.GetLayerData(LayerId);
if (cellData != null)
{
data = new CellLayerData(cellData);
}
pair = new LayerOffsetPair {
Position = cellBefore.Position,
Before = data
};
_layerOffsetPairs.Add(cellBefore.Position, pair);
}
}
