BallThrow

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 BallThrow
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        GraphicsDevice device;



        public Game1()
        {

            graphics = new GraphicsDeviceManager(this);


            Content.RootDirectory = "Content";


        }



        int screenWidth;
        int screenHeight;

        MouseState mouseStateCurrent, mouseStatePrevious;

        private Vector2 ballPosition;
        private Vector2 ballMovement;
        private int ballSize;
        private Vector2 gravity;
        private float ballRotation;
        private float ballRevolution;
        private const float maxVerticalSpeed = 12;

        private Texture2D ballTexture;
        private Texture2D backgroundTexture;


        /// <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()
        {
            graphics.PreferredBackBufferWidth = 600;
            graphics.PreferredBackBufferHeight = 600;
            graphics.IsFullScreen = false;
            graphics.ApplyChanges();
            Window.Title = "BallThrow";

            IsMouseVisible = true;

            ballPosition = new Vector2(0, 0);
            ballMovement = new Vector2(0, 0);
            ballSize = 80;
            ballRotation = 0.0f;
            ballRevolution = 0.0f;

            gravity = new Vector2(0, 0.125f);

            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);
            device = graphics.GraphicsDevice;

            screenWidth = device.PresentationParameters.BackBufferWidth;
            screenHeight = device.PresentationParameters.BackBufferHeight;

            ballTexture = Content.Load<Texture2D>("BallCL");
            backgroundTexture = Content.Load<Texture2D>("TurfBackground");


        }

        /// <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();

            mouseStateCurrent = Mouse.GetState();

            Vector2 mouseClickPos;
            if (mouseStateCurrent.LeftButton == ButtonState.Released && mouseStatePrevious.LeftButton == ButtonState.Pressed)
            {
                mouseClickPos = new Vector2(mouseStateCurrent.X, mouseStateCurrent.Y);
                ballMovement += Vector2.Multiply(Vector2.Subtract(mouseClickPos,ballPosition),0.1f);
            }

            if (mouseStateCurrent.RightButton == ButtonState.Pressed && mouseStatePrevious.RightButton == ButtonState.Pressed)
                if ((mouseStateCurrent.X >= ballPosition.X - 25 && mouseStateCurrent.X <= ballPosition.X + 25)
                    && (mouseStateCurrent.Y >= ballPosition.Y - 25 && mouseStateCurrent.Y <= ballPosition.Y + 25))
                {
                    ballPosition = new Vector2(mouseStateCurrent.X, mouseStateCurrent.Y);
                    ballMovement = Vector2.Zero;
                    ballRevolution = 0.0f;
                }

            if (mouseStateCurrent.RightButton == ButtonState.Released && mouseStatePrevious.RightButton == ButtonState.Pressed)
                if ((mouseStatePrevious.X >= ballPosition.X - 25 && mouseStatePrevious.X <= ballPosition.X + 25)
                    && (mouseStatePrevious.Y >= ballPosition.Y - 25 && mouseStatePrevious.Y <= ballPosition.Y + 25))
                {
                    ballMovement = Vector2.Multiply(new Vector2(mouseStateCurrent.X - mouseStatePrevious.X, mouseStateCurrent.Y - mouseStatePrevious.Y),1f);
                    ballRevolution = 0.0f;
                }

            ProcessBallPosition();

            mouseStatePrevious = mouseStateCurrent;

            // TODO: Add your update logic here

            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.Black);

            spriteBatch.Begin();


                DrawBackground();
                DrawBall();


            spriteBatch.End();

            base.Draw(gameTime);
        }

        private void DrawBackground()
        {
            Rectangle screenRectangle = new Rectangle(0, 0, screenWidth, screenHeight);
            spriteBatch.Draw(backgroundTexture, screenRectangle, Color.White);

        }

        private void DrawBall()
        {

            Rectangle ballRectangle = new Rectangle((int)ballPosition.X, (int)ballPosition.Y, ballSize, ballSize);
            spriteBatch.Draw(ballTexture, ballRectangle, null, Color.White, ballRotation, new Vector2(50), SpriteEffects.None, 0);
        }

        private void DrawBallShadow()
        {
            Rectangle ballShadowRectangle = new Rectangle((int)ballPosition.X, (int)ballPosition.Y, ballSize, ballSize);
            Vector2 shadowV = new Vector2();
            shadowV.X = -(screenWidth - ballPosition.Y) * 0.5f;
            shadowV.Y = (screenHeight - ballPosition.Y) * 0.3f;
            spriteBatch.Draw(ballTexture, ballShadowRectangle, null, new Color(0,0,0,180), 0.0f, shadowV, SpriteEffects.None, 1);
        }

        private void ProcessBallPosition()
        {
            ballRotation += ballRevolution;
            ballRevolution = MathHelper.SmoothStep(ballRevolution, 0, 0.05f);

            ballMovement += gravity;


            if (ballMovement.Y > maxVerticalSpeed) ballMovement.Y = maxVerticalSpeed;
            if (ballMovement.Y < -maxVerticalSpeed) ballMovement.Y = -maxVerticalSpeed;
            ballPosition += ballMovement;

            //ballMovement = new Vector2(ballMovement.X * 0.8f, ballMovement.Y);
            float smoothing = Math.Abs(ballPosition.Y - (screenHeight - ballSize/2)) < 0.1 ? 0.12f : 0.01f;
            ballMovement = Vector2.SmoothStep(ballMovement, new Vector2(0, ballMovement.Y), smoothing);
            CheckBoundaries();

            if (Math.Abs(ballMovement.X) < 0.01)
                ballMovement.X = 0.00f;
            if ((Math.Abs(ballMovement.Y) < 0.05) && (Math.Abs(ballPosition.Y - (screenHeight - ballSize / 2)) < 0.1))
                ballMovement.Y = 0.00f;
        }

        private void CheckBoundaries()
        {
            float angleRate = 0.05f;

            // CHECK BOTTOM
            if ((ballPosition.Y >= screenHeight - ballSize / 2) && (ballMovement.Y > 0))
            {
                ballMovement = new Vector2(ballMovement.X, -(ballMovement.Y * 0.75f));
                ballRevolution = ballMovement.X * angleRate;
            }

            if (ballPosition.Y > screenHeight - ballSize / 2) ballPosition.Y = screenHeight - ballSize / 2;

            // CHECK TOP
            if ((ballPosition.Y <= ballSize / 2) && (ballMovement.Y < 0))
            {
                ballMovement = new Vector2(ballMovement.X, -(ballMovement.Y));
                ballRevolution = -ballMovement.X * angleRate;
            }
            if (ballPosition.Y < ballSize / 2) ballPosition.Y = ballSize / 2;

            // CHECK LEFT
            if ((ballPosition.X <= ballSize / 2) && (ballMovement.X < 0))
            {
                ballMovement = new Vector2(-ballMovement.X * 0.75f, ballMovement.Y);
                ballRevolution = ballMovement.Y * angleRate;
            }

            if (ballPosition.X < ballSize / 2) ballPosition.X = ballSize / 2;

            // CHECK RIGHT
            if ((ballPosition.X >= screenWidth - ballSize / 2) && (ballMovement.X > 0))
            {
                ballMovement = new Vector2(-ballMovement.X * 0.75f, ballMovement.Y);
                ballRevolution = -ballMovement.Y * angleRate;
            }
            if (ballPosition.X > screenWidth - ballSize / 2) ballPosition.X = screenWidth - ballSize / 2;

        }
    }
}