Я не могу заставить свой спрайт приземлиться на вершине моей платформы

Question

Вот мой код Game1.cs.Моя цель состояла в том, чтобы спрайт "игрок" приземлился на платформах, но он не работает.Когда я использую изображение, которое не является spritesheet, оно работает.Что я здесь не так делаю?T_T Я проверил много ссылок, но все еще не могу понять это.Спасибо!Наша последняя презентация в понедельник, поэтому я в отчаянии.Я не могу передать нашу тему GameDev.

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using System.Collections.Generic;
using Microsoft.Xna.Framework.Audio;


namespace Basa_Game
{



    public class Game1 : Game
    {

        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        SoundEffect effect;
        enum GameState
        {
            Menu,
            Playing,
            Options,
        }

        GameState CurrentGameState = GameState.Menu;
        cButton btnPlay,btnControls,btnCredits,btnQuit;
        Animation player;
        Player2 player2;
        Character sample;

        List <Platform> platforms = new List<Platform>();
        KeyboardState ks;
        float elapsed;
        float delay = 200f;
        int frames = 0;

        Texture2D menuTexture;
        Rectangle destRect, sourceRect;

        Texture2D mapTexture;
        Rectangle mapRectangle;

        Texture2D tile1Texture;
        Rectangle tile1Rectangle;

        int screenWidth = 1366;
        int screenHeight =768;

        Vector2 position = new Vector2();


        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            graphics.GraphicsProfile = GraphicsProfile.HiDef;
            Content.RootDirectory = "Content";
        }
        protected override void Initialize()
        {
            // TODO: Add your initialization logic here

            destRect = new Rectangle(0, 0, 1366, 768);
            graphics.PreferredBackBufferWidth = 1366;
            graphics.PreferredBackBufferHeight = 768;
            graphics.ApplyChanges();
            base.Initialize();
        }


        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);
            menuTexture = Content.Load<Texture2D>("menu2");
            sample = new Character(Content.Load<Texture2D>("caren whole"), new Vector2(50, 50));
            player = new Animation(Content.Load<Texture2D>("basawalk"), new Vector2(200, 200), 180, 110);
            player2 = new Player2(Content.Load<Texture2D>("right2"), new Vector2(1200, 640), 180, 110);
            position = new Vector2(400, 400);
            mapTexture = Content.Load<Texture2D>("level1");
            mapRectangle = new Rectangle(0, 0, 1366,768);

            tile1Texture = Content.Load<Texture2D>("1");
            tile1Rectangle = new Rectangle(150, 540, 177, 44);


            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(20, 640)));
            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(200, 550)));
            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(650, 450)));
            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(120, 450)));
            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(900, 535)));
            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(100, 200)));
            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(400, 450)));
            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(1000, 200)));
            platforms.Add(new Platform(Content.Load<Texture2D>("1"), new Vector2(1090, 450)));


            IsMouseVisible = true;
            btnPlay = new cButton(Content.Load<Texture2D>("play"), graphics.GraphicsDevice);
            btnPlay.setPosition(new Vector2(760, 320));

            btnControls = new cButton(Content.Load<Texture2D>("btnControl"), graphics.GraphicsDevice);
            btnControls.setPosition(new Vector2(760, 450));
            screenWidth = GraphicsDevice.Viewport.Width;
            screenHeight = GraphicsDevice.Viewport.Height;



        }

        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
        }

        protected override void Update(GameTime gameTime)
        {
            MouseState mouse = Mouse.GetState();

            if (Keyboard.GetState().IsKeyDown(Keys.Escape))
                this.Exit();

            switch (CurrentGameState)
            { 
                case GameState.Menu:
                    Animate(gameTime);
                    sourceRect = new Rectangle(1366 * frames, 0, 1366, 768);
                    if (btnPlay.isClicked == true) CurrentGameState = GameState.Playing;
                    btnPlay.Update(mouse);
                    btnControls.Update(mouse);
                    break;

                case GameState.Playing:
                    foreach (Platform platform in platforms)
                        if (player.rectangle.isOnTopOf(platform.rectangle))
                        {
                            player.velocity.Y = 0f;
                            player.hasJump = false;
                        }
                      player.Update(gameTime);
                    break;

            }


            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);
            spriteBatch.Begin();

            switch (CurrentGameState)
            {
                case GameState.Menu:
                    spriteBatch.Draw(menuTexture,destRect,sourceRect, Color.White);
                    btnPlay.Draw(spriteBatch);
                    btnControls.Draw(spriteBatch);
                    break;
                case GameState.Playing:

            spriteBatch.Draw(mapTexture, mapRectangle, Color.White);

            foreach (Platform platform in platforms)
               platform.Draw(spriteBatch);
          sample.Draw(spriteBatch);
            player.Draw(spriteBatch);
            player2.Draw(spriteBatch);
                    break;
            }

            spriteBatch.End();
            // TODO: Add your drawing code here

            base.Draw(gameTime);
        }
        public void Animate(GameTime gameTime)
        {
            elapsed += (float)gameTime.ElapsedGameTime.TotalMilliseconds;
            if (elapsed >= delay)
            {
                if (frames >= 2)
                {
                    frames = 0;
                }
                else
                {
                    frames++;
                }
                elapsed = 0;


            }
        }

    }
}

static class RectangleHelper
{
    const int penetrationMargin = 5;
    public static bool isOnTopOf(this Rectangle r1, Rectangle r2)
    {
        return (r1.Bottom >= r2.Top - penetrationMargin &&
            r1.Bottom <= r2.Top + 1 &&
            r1.Right >= r2.Left + 5 &&
            r1.Left <= r2.Right - 5);
    }
}

А вот мой Animation.cs, куда я помещаю движения игрока и прочее.

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Basa_Game
{
    class Animation
    {
        public Texture2D texture;
        public Rectangle rectangle;
        public Vector2 position;
        public Vector2 origin;
        public Vector2 velocity;

        SpriteEffects effect = SpriteEffects.FlipHorizontally;

        int currentFrame;
        int frameHeight = 110;
        int frameWidth = 180;

        float time;
        float interval=80f;

       public bool hasJump;


        public Animation(Texture2D newTexture, Vector2 newPostion, int newFrameHeigth, int newFrameWidth)
        {
            texture = newTexture;
            position = newPostion;
            frameHeight = newFrameHeigth;
            frameWidth = newFrameWidth;
            hasJump = true;
        }

        public void Update(GameTime gameTime)
        {
            position += velocity;
            rectangle = new Rectangle(currentFrame * frameWidth, 0, frameWidth, frameHeight);
            origin = new Vector2(rectangle.Width / 2, rectangle.Height / 2);
            position = position + velocity;

            if (Keyboard.GetState().IsKeyDown(Keys.D))
            {
                AnimateRight(gameTime);
                velocity.X = 1;
            }
            else if (Keyboard.GetState().IsKeyDown(Keys.A))
            {
                AnimateLeft(gameTime);
                velocity.X = -1;
            }
            else velocity.X = 0f;
            if (rectangle.X <= 0)
                rectangle.X = 0;

            if (Keyboard.GetState().IsKeyDown(Keys.W) && hasJump == false)
            {
                position.Y -= 10f;
                velocity.Y = -5f;
                hasJump = true;
            }

            if (hasJump == true)
            {
                float i = 1;
                velocity.Y += 0.15f * i;
            }

            if (position.Y + texture.Height >= 768)
                hasJump = false;

            if (hasJump == false)
                velocity.Y = 0f;

        }

        public void AnimateRight(GameTime gameTime)
        {
            time += (float)gameTime.ElapsedGameTime.TotalMilliseconds / 2;
            effect = SpriteEffects.None;
            if (time > interval)
            {
                currentFrame++;
                time = 0;
                if (currentFrame > 3)
                    currentFrame = 0;
            }
        }
        public void AnimateLeft(GameTime gameTime)
        {
            time += (float)gameTime.ElapsedGameTime.TotalMilliseconds / 2;

            effect = SpriteEffects.FlipHorizontally;

            if (time > interval)
            {
                currentFrame++;
                time = 0;
                if (currentFrame > 3)
                    currentFrame = 0;
            }
        }
        public void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(texture, position, rectangle, Color.White, 0f, origin, 1.0f, effect, 0);
        }

    }
}