Part V

by Uditha Bandara

 

This month we`ll discuss about the code and steps to use Keyboard and Mouse in a PC game.

Player inputs are one of the important thing in a Video game.

 

 

 

Help screen from NFS 6

First you need to have an image to represent mouse cursor and another image to show the keyboard usage.

You can add those files in to the content folder.

 

 

Then you are able to write a code to use keyboard and mouse.

In the Game1.cs file initialize these variables.

 

KeyboardState mykeyboardstate;

//create a keyboardstate  object to get the state of the keyboard

       

 

MouseState mymousesatate;

//get the state of the mouse

      

 SpriteFont myfont;

//add a sprite font to draw String in the screan

 

 

Texture2D mytexture, mytexture2;//creating texture object

 

float Position = 0.0f;//initializing up down position

      

float Position2 = 0.0f;//initializing left right position

       

float mousex = 0.0f;//initilizing mousex position 

      

float mousey = 0.0f;//initializing mousey position

 

 

Now in the LoadContent()method write code for load the assest.

 

//change the window title

Window.Title = "Using the keyboard+mouse-demo";

myfont = Content.Load<SpriteFont>("Arial");

mytexture = Content.Load<Texture2D>("pic");

mytexture2 = Content.Load<Texture2D>("cursor");

 

 

 

Then in the Update() methord you can chack for keyboard and mouse inputs.

 

 

 

 mykeyboardstate = Keyboard.GetState();//capturing the keybard state

 

 mymousesatate = Mouse.GetState();//capturing mouse state

 

 mousex = (float)mymousesatate.X;//getting the x position of the mouse

 

 mousey = (float)mymousesatate.Y;//getting the y position of the mouse

 

       

// Move 400 pixels each second

  float moveFactorPerSecond = 80 *            (float)gameTime.ElapsedRealTime.TotalMilliseconds / 1000.0f;

 

 

//chage the position according to the key pressed up,down,left,right

          

 if (mykeyboardstate.IsKeyDown(Keys.Up))

         Position -= moveFactorPerSecond;

 

  if (mykeyboardstate.IsKeyDown(Keys.Down))

          Position += moveFactorPerSecond;

 

 

           

if (mykeyboardstate.IsKeyDown(Keys.Left))

         Position2 -= moveFactorPerSecond;

 

 

 if (mykeyboardstate.IsKeyDown(Keys.Right))

          Position2 += moveFactorPerSecond;

 

 

In the  Draw () method you can see the Changes of the inputs by drawing the images.

 

myspitebatch.Begin();//start process

 

Vector2 position = new Vector2(200.0f + (int)Position2, 200.0f + ((int)Position));

  //setting position with variables (Position1) and (Position2)

  //those variables change the position of the image according to the key pressing

           

 myspitebatch.Draw(mytexture, position, Color.White);//drawing the image

           

 myspitebatch.DrawString(myfont, "Use Arrowkeys to move the image&use mouse to point", new Vector2(10.0f, 10.0f), Color.Gold);//drawing text on the screan

 

 myspitebatch.Draw(mytexture2, new Vector2(mousex, mousey), Color.White);

       //drawing the cursor image, acording to the mouse position

    

 myspitebatch.End();//end process

Now you can run the project by pressing F5 or by clicking the run button.

Final code of Game1.cs

 

/*

 content created by -uditha sampath bandara

 udithamail@yahoo.com

 

*/

 

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;

using Microsoft.Xna.Framework.Net;

using Microsoft.Xna.Framework.Storage;

 

namespace Mouse_and_keyboard

{

    /// <summary>

    /// This is the main type for your game

    /// </summary>

    public class Game1 : Microsoft.Xna.Framework.Game

    {

        GraphicsDeviceManager graphics;

        SpriteBatch myspitebatch;

        KeyboardState mykeyboardstate;

        MouseState mymousesatate;      

        SpriteFont myfont;

        Texture2D mytexture, mytexture2;

        float Position = 0.0f;

        float Position2 = 0.0f;

        float mousex = 0.0f;

        float mousey = 0.0f;

 

        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()

        {

                        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()

        {

            Window.Title = "Using the keyboard+mouse-demo";

            myspitebatch = new SpriteBatch(GraphicsDevice);

            myfont = Content.Load<SpriteFont>("Arial");

            mytexture = Content.Load<Texture2D>("pic");

            mytexture2 = Content.Load<Texture2D>("cursor");

        }

 

        /// <summary>

        /// UnloadContent will be called once per game and is the place to unload

        /// all content.

        /// </summary>

        protected override void UnloadContent()

        {

         }

        /// <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();

            mykeyboardstate = Keyboard.GetState();

            mymousesatate = Mouse.GetState();

            mousex = (float)mymousesatate.X;

            mousey = (float)mymousesatate.Y;

            float moveFactorPerSecond = 80 *

                (float)gameTime.ElapsedRealTime.TotalMilliseconds / 1000.0f;

 

            if (mykeyboardstate.IsKeyDown(Keys.Up))

                Position -= moveFactorPerSecond;

 

            if (mykeyboardstate.IsKeyDown(Keys.Down))

                Position += moveFactorPerSecond;

            if (mykeyboardstate.IsKeyDown(Keys.Left))

                Position2 -= moveFactorPerSecond;

 

            if (mykeyboardstate.IsKeyDown(Keys.Right))

                Position2 += moveFactorPerSecond;

 

            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);

 

            myspitebatch.Begin();

            Vector2 position = new Vector2(200.0f + (int)Position2, 200.0f + ((int)Position));        

            myspitebatch.Draw(mytexture, position, Color.White);           

            myspitebatch.DrawString(myfont, "Use Arrowkeys to move the image&use mouse to point", new Vector2(10.0f, 10.0f), Color.Gold);

            myspitebatch.Draw(mytexture2, new Vector2(mousex, mousey), Color.White);         

            myspitebatch.End();

            base.Draw(gameTime);

        }

    }

}

 

This is the end of the using Mouse and Keyboard in a PC game tutorial.

Also source project is attached with this article.

 

Form next tutorial you learn about working with game Menus in XNA.

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