using System;
using System.Diagnostics;

namespace SpaceInvaders
{
    public abstract class SpriteBase : DLink
    {
        //-------------------------------------------------------------------
        //  FIELDS
        //-------------------------------------------------------------------

        //set of colors used by sprites?
        public static Azul.Color pRed = new Azul.Color(0.9019f, 0.0784f, 0.0784f, 1.0f);
        public static Azul.Color pGreen = new Azul.Color(0.1137f, 0.8196f, 0.2667f, 1.0f);
        public static Azul.Color pYellow = new Azul.Color(1.0f, 1.0f, 0.0f, 1.0f);
        public static Azul.Color pWhite = new Azul.Color(1.0f, 1.0f, 1.0f, 1.0f);

        //back pointer for remove
        private SpriteNode pBackSpriteNode;


        //-------------------------------------------------------------------
        //  CONSTRUCTION
        //-------------------------------------------------------------------

        public SpriteBase() : base()
        {
            this.pBackSpriteNode = null;
        }


        //-------------------------------------------------------------------
        //  PUBLIC METHODS
        //-------------------------------------------------------------------

        public void SetSpriteNode(SpriteNode pSpriteNode)
        {
            Debug.Assert(pSpriteNode != null);
            this.pBackSpriteNode = pSpriteNode;
        }

        public SpriteNode GetSpriteNode()
        {
            Debug.Assert(this.pBackSpriteNode != null);
            return this.pBackSpriteNode;
        }


        //-------------------------------------------------------------------
        //  ABSTRACT METHODS
        //-------------------------------------------------------------------

        public abstract void Update();

        public abstract void Render();


    } //end class

} //end namespace