PingPong

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 WindowsGame4
{
    class Paddle
    {
        public Paddle(int width, int height)
        {
            position = new Vector2(0, 0);
            rect = new Rectangle(0, 0, width, height);
        }

        public void Update()
        {
            rect.X = (int)position.X;
            rect.Y = (int)position.Y;
        }

        public void Draw(SpriteBatch spritebatch, Texture2D _texture)
        {
            spritebatch.Draw(_texture, position, Color.White);
        }

        public Vector2 position;
        public Rectangle rect;
        public const int speed = 400;
        public int point;
        public bool looser;
    }

    class Ball
    {
        public Ball(int width, int height)
        {
            position = new Vector2(400, 285);
            rect = new Rectangle(0, 0, width, height);
            angle = 20;
            speed = 300;
        }

        public void Update()
        {
            rect.X = (int)position.X;
            rect.Y = (int)position.Y;
        }

        public void Draw(SpriteBatch spriteBatch, Texture2D _texture)
        {
            spriteBatch.Draw(_texture, position, Color.White);
        }

        public Vector2 position;
        public Rectangle rect;
        public float angle;
        public int speed;
        public const int maxSpeed = 1000;
    }

    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        SpriteFont spriteFont;

        Texture2D background, redPaddle, bluePaddle, ballText;
        Paddle red, blue;
        Ball ball;

        double deltaTime;
        bool isPlaying;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            graphics.PreferredBackBufferWidth = 800;
            graphics.PreferredBackBufferHeight = 600;
            red = new Paddle(25, 100);
            blue = new Paddle(25, 100);
            blue.position.X = 775;
            blue.position.Y = red.position.Y = 250;
            ball = new Ball(20, 20);
            isPlaying = red.looser = blue.looser = false;
            red.point = blue.point = 0;
            Content.RootDirectory = "Content";
        }

        protected override void Initialize()
        {
            base.Initialize();
        }

        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);
            background = Content.Load<Texture2D>("Background2");
            redPaddle = Content.Load<Texture2D>("RedPaddle");
            bluePaddle = Content.Load<Texture2D>("BluePaddle");
            ballText = Content.Load<Texture2D>("Ball");
            spriteFont = this.Content.Load<SpriteFont>("Arial");
        }

        protected override void UnloadContent()
        {        }

        protected override void Update(GameTime gameTime)
        {
            deltaTime = (float)gameTime.ElapsedGameTime.Milliseconds / 1000.0f;
            if (Keyboard.GetState().IsKeyDown(Keys.Escape)) this.Exit();

            if (Keyboard.GetState().IsKeyDown(Keys.Space))
            {
                if (!isPlaying)
                    isPlaying = true;
            }

            if (isPlaying)
            {
                if (Keyboard.GetState().IsKeyDown(Keys.Q))
                {
                    if (red.position.Y > 5)
                        red.position.Y += (float)(-Paddle.speed * deltaTime);
                }
                if (Keyboard.GetState().IsKeyDown(Keys.P))
                {
                    if (blue.position.Y > 5)
                        blue.position.Y += (float)(-Paddle.speed * deltaTime);
                }
                if (Keyboard.GetState().IsKeyDown(Keys.A))
                {
                    if (red.position.Y < 600 - red.rect.Height - 5)
                        red.position.Y += (float)(Paddle.speed * deltaTime);
                }
                if (Keyboard.GetState().IsKeyDown(Keys.L))
                {
                    if (blue.position.Y < 600 - blue.rect.Height - 5)
                        blue.position.Y += (float)(Paddle.speed * deltaTime);
                }
            }

            // Ball move
            ball.position.X -= (float)(Math.Cos(ball.angle) * (ball.speed * deltaTime));
            ball.position.Y += (float)(Math.Sin(ball.angle) * (ball.speed * deltaTime));

            if (ball.position.Y < 0)
            {
                ball.angle = -ball.angle;
                ball.position.Y = 0.1f;
            }
            else if (ball.position.Y + ball.rect.Height > 600)
            {
                ball.angle = -ball.angle;
                ball.position.Y = (600 - ball.rect.Width - 0.1f);
            }
            if (ball.position.X < 0 && (isPlaying == true))
            {
                blue.point++;
                red.looser = true;
                Reset();
            }
            if (ball.position.X > 775 && (isPlaying == true))
            {
                red.point++;
                blue.looser = true;
                Reset();
            }

            red.Update();
            blue.Update();
            ball.Update();

            if (red.rect.Intersects(ball.rect))
            {
                ball.angle = MathHelper.Pi - ball.angle;
                ball.position.X = (red.position.X + red.rect.Width + 0.1f);
                ball.speed += 10;
            }
            else if (blue.rect.Intersects(ball.rect))
            {
                ball.angle = MathHelper.Pi - ball.angle;
                ball.position.X = (blue.position.X - ball.rect.Width - 0.1f);
                ball.speed += 10;
            }

            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            spriteBatch.Begin();
            spriteBatch.Draw(background, new Vector2(0, 0), Color.White);

            spriteBatch.DrawString(spriteFont, "Czerwony: " + red.point, new Vector2(50, 10), Color.White);
            spriteBatch.DrawString(spriteFont, "Niebieski: " + blue.point, new Vector2(650, 10), Color.White);

            red.Draw(spriteBatch, redPaddle);
            blue.Draw(spriteBatch, bluePaddle);

            if(isPlaying == true)
            {
                ball.Draw(spriteBatch, ballText);

                if ((ball.position.X < 0) || (ball.position.X + ball.rect.Width > 800))
                    isPlaying = false;
            }

            spriteBatch.End();
            base.Draw(gameTime);
        }

        public void Reset()
        {
            blue.position.X = 775;
            blue.position.Y = red.position.Y = 250;

            if (red.looser == true)
                ball.position.X += (float)(Math.Cos(ball.angle) * (ball.speed * deltaTime));
            else if (blue.looser == true)
                ball.position.X -= (float)(Math.Cos(ball.angle) * (ball.speed * deltaTime));

            ball.position.Y = 250;
            ball.angle = 10;
            ball.speed = 300;

            isPlaying = false;
        }
    }
}