/// <summary>
/// Adds the cells from prefab to the level builder.
/// </summary>
/// <param name="builder">The level builder.</param>
/// <param name="upperLeft">The upper left position of the prefab within the level.</param>
/// <param name="flipX">if set to <c>true</c> the prefab will be flipped horizontally.</param>
/// <param name="flipY">if set to <c>true</c> the prefab will be flipped vertically.</param>
/// <param name="prefabGuid">The prefab instance's unique identifier.</param>
/// <param name="prefab">The prefab.</param>
/// <param name="prefabDimensions">The prefab dimensions.</param>
private static void AddCellsFromPrefab(LevelBuilder builder,
Pos2D upperLeft,
bool flipX,
bool flipY,
Guid prefabGuid,
PrefabData prefab,
Pos2D prefabDimensions)
{
// Loop over the rows in the prefab
int y = 0;
foreach (var row in prefab.Data)
{
// Loop over the cells in the prefab
int x = 0;
foreach (var c in row)
{
// Do nothing if there's nothing assignable for the cell
if (c != ' ')
{
Pos2D cellPos =
CalculatePrefabCellPosition(new Pos2D(x, y), upperLeft, prefabDimensions, flipY, flipX);
var cell = builder.BuildPrefabCell(c, cellPos, prefab);
// Respect the IsInvulnerable flag on prefabs
if (prefab.IsInvulnerable)
{
foreach (var wall in cell.Objects.Where(o => o.ObjectType == GameObjectType.Wall))
{
wall.SetInvulnerable();
}
}
builder.AddCell(cell, prefabGuid);
}
x++;
}
y++;
}
}
/// <summary>
/// Adds a prefab room to a level under construction.
/// </summary>
/// <param name="builder">The level builder.</param>
/// <param name="upperLeft">The absolute position of the upper left point of the room.</param>
/// <param name="prefab">The prefab to add</param>
/// <param name="flipX">if set to <c>true</c> the prefab will be flipped horizontally before being applied.</param>
/// <param name="flipY">if set to <c>true</c> the prefab will be flipped vertically before being applied.</param>
/// <returns>A unique identifier for the prefab, used for encounter generation.</returns>
public Guid AddPrefab(LevelBuilder builder,
Pos2D upperLeft,
PrefabData prefab,
bool flipX = false,
bool flipY = false)
{
// Validate that the prefab was identified.
if (prefab == null)
{
throw new ArgumentNullException(nameof(prefab));
}
// Come up with a distinct prefab ID for this particular prefab instance
var prefabGuid = Guid.NewGuid();
// Declare loop formulae here so they don't have to be recomputed for every cell
Pos2D prefabDimensions = new Pos2D(prefab.Data.Max(c => c.Length), prefab.Data.Count);
AddCellsFromPrefab(builder, upperLeft, flipX, flipY, prefabGuid, prefab, prefabDimensions);
return(prefabGuid);
}