xna 帧动画

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;

namespace WindowsGame1
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics; 
        SpriteBatch spriteBatch;
        Texture2D texture;

        //图像的长宽都是75
        Point frameSize = new Point(75, 75);
        Point currentFrame = new Point(0, 0);
        //8 rows 6 cols
        Point sheetSize = new Point(6, 8);
        
        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        /// <summary>
        /// Allows the game to perform any initialization it needs to before starting to run.
        /// This is where it can query for any required services and load any non-graphic
        /// related content.  Calling base.Initialize will enumerate through any components
        /// and initialize them as well.
        /// </summary>
        protected override void Initialize()
        {
            // TODO: Add your initialization logic here

            base.Initialize();
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);

            // TODO: use this.Content to load your game content here

            
            texture    = Content.Load<Texture2D>(@"Images\threerings");
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// all content.
        /// </summary>
        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
        }

        /// <summary>
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Update(GameTime gameTime)
        {
            // Allows the game to exit
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            // TODO: Add your update logic here
            currentFrame.X++;
            if (currentFrame.X >= sheetSize.X)
            {
                currentFrame.X = 0;
                ++currentFrame.Y;
                if (currentFrame.Y >= sheetSize.Y)
                    currentFrame.Y = 0;
            }


            base.Update(gameTime);
        }

        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            // TODO: Add your drawing code here
            //通知显卡开始传送文件
            //从左上角开始绘制
            //white表示不会染色
            spriteBatch.Begin();
            spriteBatch.Draw(texture,
                Vector2.Zero,
                new Rectangle(currentFrame.X * frameSize.X,
                currentFrame.Y * frameSize.Y,
                frameSize.X,
                frameSize.Y),
                Color.White, 0, Vector2.Zero, 1
                , SpriteEffects.None, 0);
            spriteBatch.End();
            


            base.Draw(gameTime);
        }
    }
}