SpriteChanger

using System;
using UnityEngine;
using UnityEngine.UI;

namespace Antnomoly
{
    public enum StateValues
    {
        None = 0,
        beginning,
        beginningFAKE,
        antnomoly,
        canister_inside2
        // ...
    }
}


namespace Antnomoly
{
    public class SpriteChanger : MonoBehaviour
    {
        Image m_Image;
        public Sprite Sprite1;
        public Sprite Sprite2;
        public Sprite Sprite3;

        AntnomolyGame game;

        void Awake ( )
        {
            game = GetComponent<AntnomolyGame> ( );
            m_Image = GetComponent<Image> ( );

            // Subscribe the the "StateChange" event, fired in the AntnomolyGame script.
            // This script will now listen for "AntnomolyGame.StateChange" events.
            game.StateChange += OnStateChange;
        }

        /// <summary>
        /// Handle the "StateChange" event, when it's fired in the AntnomolyGame script.
        /// </summary>
        private void OnStateChange ( object sender, StateChangeArgs e )
        {
            switch ( e.State )
            {
                case StateValues.None:
                    m_Image.sprite = null;
                    break;

                case StateValues.beginning:
                    m_Image.sprite = Sprite1;
                    break;

                case StateValues.antnomoly:
                case StateValues.canister_inside2:
                    m_Image.sprite = Sprite2;
                    break;
                case StateValues.beginningFAKE:
                    m_Image.sprite = Sprite1;
                    break;
            }
        }
    }
}