/MangoLander/MangoLander/Graphics/AnimatedSprite.cs

using Microsoft.Xna.Framework;

using Microsoft.Xna.Framework.Graphics;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace MangoLander.Graphics

{

    class AnimatedSprite : IUpdateable

    {

        public Texture2D Texture { get; private set; }

        public int FrameWidth { get; set; }

        public int FrameHeight { get; set; }



        public int CurrentFrame { get; private set; }

        public int TotalFrames { get; private set; }



        public double FrameDelay { get; set; }

        public bool LoopAnimation { get; set; }



        private bool _initialized = false;



        private double _elapsedSinceLastFrame = 0;

        private bool _playing = false;



        public AnimatedSprite()

        {

        }



        public AnimatedSprite(Texture2D texture, int frameWidth, int frameHeight, double frameDelay, bool loopAnimation)

        {

            Initialize(texture, frameWidth, frameHeight, frameDelay, loopAnimation);

        }



        public void Initialize(Texture2D texture, int frameWidth, int frameHeight, double frameDelay, bool loopAnimation)

        {

            this.Texture = texture;

            this.FrameWidth = frameWidth;

            this.FrameHeight = frameHeight;

            this.FrameDelay = frameDelay;

            this.LoopAnimation = loopAnimation;

            this.CurrentFrame = 0;



            if (this.FrameWidth > this.Texture.Width || this.FrameHeight > this.Texture.Height)

            {

                // Illegal texture and frame height/width specification

                _initialized = false;

                return;

            }



            this.TotalFrames = this.Texture.Width / this.FrameWidth;

            _initialized = true;

        }



        private Rectangle GetCurrentFrameRectangle()

        {

            return new Rectangle(this.FrameWidth * this.CurrentFrame, 0, this.FrameWidth, this.FrameHeight);

        }



        // Control methods

        public void Play()

        {

            this.CurrentFrame = 0;

            _playing = true;

            _elapsedSinceLastFrame = 0;

        }



        public void Stop()

        {

            _playing = false;

            _elapsedSinceLastFrame = 0;

        }



        public void Reset()

        {

            this.CurrentFrame = 0;

            _elapsedSinceLastFrame = 0;

        }



        public void Draw(SpriteBatch spriteBatch, Rectangle destinationRectangle, Color color, float rotation, Vector2 origin, SpriteEffects effects, float layerDepth)

        {

            if (!_initialized)

                return;



            spriteBatch.Draw(this.Texture, destinationRectangle, this.GetCurrentFrameRectangle(), color, rotation, origin, effects, layerDepth);

        }



        public void Update(GameTime gameTime)

        {

            if (!_initialized || !_playing || this.FrameDelay <= 0 || this.TotalFrames == 0)

                return;



            double currentFrameTime = gameTime.ElapsedGameTime.TotalSeconds;

            _elapsedSinceLastFrame += currentFrameTime;



            while (_elapsedSinceLastFrame > this.FrameDelay)

            {

                _elapsedSinceLastFrame -= this.FrameDelay;

                this.CurrentFrame++;



                // Are we at the end?

                if (this.CurrentFrame == this.TotalFrames)

                {

                    if (this.LoopAnimation)

                    {

                        // Loop back to the start

                        this.CurrentFrame = 0;

                    }

                    else

                    {

                        // Stop playing

                        _playing = false;

                        _elapsedSinceLastFrame = 0;

                        break;

                    }

                }

            }

        }

    }

}