/// <summary>
/// Stores an item in the specified tile.
/// If the tile is already full or cannot accept all of the item(s) being added,
/// then this method returns any excess.
/// Otherwise, this method returns null.
/// </summary>
internal static Item StoreItem(Chunk chunk, Point2D mapLocation, Item item)
{
Tile tile = WorldUtil.GetTile(mapLocation, chunk);
Item overflow = null;
if (tile.Item == null)
{
tile.Item = item;
}
else
{
Item final = Item.Combine(tile.Item, item, out overflow);
}
return(overflow);
}
/// <summary>
/// Stores an item in the specified tile.
/// If the tile is already full or cannot accept all of the item(s) being added,
/// then this method returns any excess.
/// Otherwise, this method returns null.
/// </summary>
internal static Item StoreItem(Chunk chunk, Point2D mapLocation, Item item)
{
Tile tile = WorldUtil.GetTile(mapLocation, chunk);
Item overflow = null;
if (tile.MainObject == null)
{
tile.MainObject = item;
}
else
{
Item existing = tile.MainObject as Item;
if (existing == null)
{
throw new UnexpectedStateException("Invalid addition of an item to a tile with an object of another type occuping the main object slot.");
}
tile.MainObject = Item.Combine(existing, item, out overflow);
}
return(overflow);
}
/// <summary>
/// Lets a chunk know that there is an item of the specified type in the specified tile position.
/// </summary>
private static void RememberWhichTile(Item item, Point2D mapLocation, Chunk chunk)
{
if (!chunk.Items.ContainsKey(item.ItemID))
{
//chunk.Items doesn't store one key and value for every item in the game upfront.
chunk.Items.Add(item.ItemID, new RTree <Point2D>());
}
RTree <Point2D> itemLocations = chunk.Items[item.ItemID];
List <Point2D> result = itemLocations.Contains(new Rectangle(mapLocation.X, mapLocation.Y, mapLocation.X, mapLocation.Y));
if (result.Count > 0)
{
//The chunk already knows that there is an item of the specified type in the specified position.
}
else
{
Rectangle r = new Rectangle(mapLocation.X, mapLocation.Y, mapLocation.X, mapLocation.Y);
Tile tile = WorldUtil.GetTile(mapLocation, chunk);
ComponentSelectable selectable = tile.GetExactComponent <ComponentSelectable>();
itemLocations.Add(r, selectable.MapLocation);
}
}
/// <summary>
/// Lets a chunk know that there is an item of the specified type in the specified tile position.
/// </summary>
internal static void RememberWhichTile(Item item, Point2D mapLocation, Chunk chunk, int dimension)
{
if (!chunk.Items.ContainsKey(item.ItemID))
{
//chunk.Items doesn't store one key and value for every item in the game upfront.
chunk.Items.Add(item.ItemID, new RTree <Point2D>());
}
RTree <Point2D> itemLocations = chunk.Items[item.ItemID];
List <Point2D> result = itemLocations.Contains(new Rectangle(mapLocation.X, mapLocation.Y, mapLocation.X, mapLocation.Y));
if (result.Count > 0)
{
//The chunk already knows that there is an item of the specified type in the specified position.
}
else
{
itemLocations.Add(new Rectangle(mapLocation.X, mapLocation.Y, mapLocation.X, mapLocation.Y), WorldUtil.GetTile(mapLocation, chunk).MapLocation);
}
}