public bool AddItem(Item item, Point location, IHistoryTransaction trans,
CollisionAction collisionAction = CollisionAction.ThrowException)
{
if (!item.IsRoot)
{
throw new InvalidOperationException("Only root items may be added to the field.");
}
Size size = item.GetSize();
var l = mapManager.CurrentLayer;
var itemRect = new Rectangle(location, size);
if (IsOccupied(itemRect))
{
switch (collisionAction)
{
case CollisionAction.ThrowException:
throw new InvalidOperationException("The specified location is already occupied.");
case CollisionAction.Abort:
return(false);
case CollisionAction.Overwrite:
DeleteRect(itemRect, trans);
break;
default:
throw new ArgumentOutOfRangeException(nameof(collisionAction), collisionAction, null);
}
}
if (!IsInWorldBounds(itemRect))
{
switch (collisionAction)
{
case CollisionAction.ThrowException:
throw new InvalidOperationException("The specified location is outside of the world.");
case CollisionAction.Abort:
return(false);
case CollisionAction.Overwrite:
return(false);
default:
throw new ArgumentOutOfRangeException(nameof(collisionAction), collisionAction, null);
}
}
trans?.AddStep(new AddItemStep(item, location, this));
Item tile = l.GetTile(location);
l.SetExtensionTiles(item, location.X, location.Y);
tile.CopyFrom(item);
return(true);
}
public bool DeleteTile(Point tilePt, IHistoryTransaction?trans, bool resolveExtensions = false)
{
if (!IsInWorldBounds(tilePt))
{
return(false);
}
Item tile = mapManager.CurrentLayer.GetTile(tilePt);
if (tile.IsNone)
{
return(false);
}
if (!tile.IsRoot)
{
if (resolveExtensions)
{
if (tile.IsExtension)
{
tilePt.Offset(-tile.ExtensionX, -tile.ExtensionY);
tile = mapManager.CurrentLayer.GetTile(tilePt);
}
else
{
throw new InvalidOperationException("Specified location is not a root or extension tile.");
}
}
else
{
throw new InvalidOperationException("Specified location is not a root tile.");
}
}
Debug.Assert(tile.IsRoot);
trans?.AddStep(new DeleteItemStep(tile, tilePt, this));
mapManager.CurrentLayer.DeleteExtensionTiles(tile, tilePt);
tile.Delete();
return(true);
}