/// <summary>
/// Requests an entity from the entity manager.
/// </summary>
/// <typeparam name="T">The entity type.</typeparam>
/// <param name="position">The starting position of the entity.</param>
/// <returns>A reference to the entity.</returns>
public IEntity RequestEntity <T>(Vector3 position) where T : AbstractEntity, new()
{
// Store the type of entity requested.
Type entityType = typeof(T);
// Variable to hold requested entity.
AbstractEntity entity = null;
// Check if there is an inactive entity.
if (inactiveEntities.ContainsKey(entityType))
{
if (inactiveEntities[entityType].Count > 0)
{
// Get entity.
entity = inactiveEntities[entityType].ElementAt(0);
// Set ID.
entity.Setup(++entitiesCreated);
// Remove entity from the map.
inactiveEntities[entityType].RemoveAt(0);
}
}
// Else, create new entity.
else
{
// Create new entity.
entity = new T();
// Set ID.
entity.Setup(++entitiesCreated);
// Check if entity is loadable.
// If loadable, add to load system.
if (entity is ILoadable)
{
loadSystem.AddEntity(entity);
}
}
// Initialise entity.
entity.Initialise(position, this, sceneStateManager);
// Add entity to active pool.
activeEntities.Add(entity.Id, entity);
// Return entity as IEntity.
return(entity);
}
/// <summary>
/// Adds an entity to a scene.
/// </summary>
/// <param name="sceneId">The ID of the scene.</param>
/// <param name="entity">The entity to add.</param>
public void AddEntity(int sceneId, IEntity entity)
{
// Check if scene exists.
if (scenes.ContainsKey(sceneId))
{
// Get scene.
IScene scene = scenes[sceneId];
// Add entity.
scenes[sceneId].AddEntity(entity);
// If scene is running, add to systems.
if (((ISceneState)scene).State == SceneState.Running)
{
collisionSystem.AddEntity(entity);
inputSystem.AddEntity(entity);
if (entity is IRenderable)
{
renderSystem.AddEntity(entity);
}
if (entity is IUpdatable)
{
updateSystem.AddEntity(entity);
}
}
// Else if, scene is paused, add to render system only.
else if (((ISceneState)scene).State == SceneState.Paused)
{
if (entity is IRenderable)
{
renderSystem.AddEntity(entity);
}
}
}
}