LevelLinkBehavior.cs

using System;
using System.Diagnostics;
using log4net;
using SharpDX;

namespace Ramp.Simulation
{
    /// <summary>
    ///     A link that, when activated by touching or script, moves the activator to another level.
    /// </summary>
    public class LevelLinkBehavior : Behavior, IActivatable
    {
        private static readonly ILog Log = LogManager.GetLogger(typeof(LevelLinkBehavior));

        private Collider _collider;

        public LevelLinkBehavior(ActorComponentInitializer aci)
            : base(aci)
        {
            aci.Bind(out _collider, true);
            _collider.TouchBegan += OnTouchBegan;

            TargetName = aci.GetSpawnArgument<string>("LinkLevel");
            TargetPosition = aci.GetSpawnArgument<Vector2>("LinkPosition");
        }

        /// <summary>
        ///     Name of the target level.
        /// </summary>
        public string TargetName { get; set; }

        /// <summary>
        ///     Target position to place the actor in.
        /// </summary>
        public Vector2 TargetPosition { get; set; }

        /// <summary>
        ///     Activate the level link, causing the target to be moved to the destination level and position.
        /// </summary>
        public virtual async void Activate(Actor target)
        {
            if (!Enabled || target == Actor || !target.CanChangeLevels)
                return;

            Debug.Assert(!target.IsLevelChanging, "!target.IsLevelChanging");

            try
            {
                await target.ChangeLevelAync(TargetName, TargetPosition);
            }
            catch (InvalidOperationException ex)
            {
                Log.Error("Level link activation failed", ex);
            }
        }

        protected virtual void OnTouchBegan(object sender, ActorCollisionEventArgs e)
        {
            Activate(e.Instigator.Actor);
        }
    }
}