//Override this to get all entities on the world at a specific location
public override ICollection<XmasEntity> GetEntities(XmasPosition pos)
{
var vpos = (VacuumPosition)pos;
//check if the vacuum cleaner is located at the position
//then return the entity, if not give an empty collection
XmasEntity[] vacuum;
if (this.vacuumTiles[vpos.PosID] != null)
vacuum = new XmasEntity[] { this.vacuumTiles[vpos.PosID] };
else
vacuum = new XmasEntity[0];
//Check if dirt is located on the given position
XmasEntity[] dirt;
if (this.dirtTiles[vpos.PosID] != null)
dirt = new XmasEntity[] { this.dirtTiles[vpos.PosID] };
else
dirt = new XmasEntity[0];
//Concatenate the two collections of dirt and vacuum cleaner
//and make them into an array for the data to be immutable
return vacuum.Concat(dirt).ToArray();
}
//Override this to provide the ability for the world to change position of the entity
public override bool SetEntityPosition(XmasEntity xmasEntity, XmasPosition tilePosition)
{
//This can be implemented by removing the entity from its last location
//and re-add it to the tile of its new position
var pos = (VacuumPosition) tilePosition;
var lastpos = (VacuumPosition)this.GetEntityPosition(xmasEntity);
if (xmasEntity is VacuumCleanerAgent)
{
this.vacuumTiles[lastpos.PosID] = null;
this.vacuumTiles[pos.PosID] = xmasEntity as VacuumCleanerAgent;
return true;
}
else if (xmasEntity is DirtEntity)
{
this.dirtTiles[lastpos.PosID] = null;
this.dirtTiles[pos.PosID] = xmasEntity as DirtEntity;
return true;
}
return false;
}
public VacuumMovedEvent(XmasPosition from, XmasPosition to)
{
this.From = from;
this.To = to;
}
/// <summary>
/// Constructor for making an EntitySpawnInformation
/// </summary>
/// <param name="pos">The position of the spawn</param>
public EntitySpawnInformation(XmasPosition pos)
{
this.pos = pos;
}
