Instead of:
SquarePosition.X -= (float)(3 * Math.Cos(rotation));
SquarePosition.Y -= (float)(3 * Math.Sin(rotation));

Use:
if (XDistance >= 3 | YDistance >= 3 | XDistance <= -3 | YDistance <= -3 )
{
SquarePosition.X -= (float)(3 * Math.Cos(rotation));
SquarePosition.Y -= (float)(3 * Math.Sin(rotation));
}
else
{
SquarePosition.X -= (float)(0 * Math.Cos(rotation));
SquarePosition.Y -= (float)(0 * Math.Sin(rotation));
}

Mess around with the = numbers to get a different range. Enjoy.

This code helped a lot in a project I’m working on.
But I have a question, is it possible to “Lock” the rotation?

I’m doing a shoot’em up game, where the player is faced upwards, since he is moving in that direction. Aiming and rotation of the player sprite is controlled by the mouse, but I don’t want the Player to be able to rotate around.

Basivally I only want him/her to aim in a cone, upwards like: \/

So can you somehow stop the rotation?
By lots of “if(){}”?

Thanks in advance!

Position += Vector2.Normalize(SqurePosition – Mouse);

Learn OOP fast, it helps later on in xna game development, or basicly code 101.

As for your demo code, its pretty neat.

– Xna 4.0, windows phone 7 is the future?

My code so far:

namespace LastManDead
{
public class Game1 : Microsoft.Xna.Framework.Game
{
//Variables

GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
Texture2D soldier;
Texture2D monster;
Texture2D aim;
Texture2D background;
Vector2 soldierPosition;
Vector2 monsterPosition;
Vector2 aimPosition;
float rotation;
float mrotation;
float timer = 0f;
float mtimer = 0f;
float interval = 200f;
float minterval = 200f;
Point framesize = new Point(60, 60);
Point mFramesize = new Point(60, 60);
int currentFrame = 0;
int mcurrentFrame = 0;

public Game1()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = “Content”;
}

protected override void Initialize()
{
//make the mouse invisible!
this.IsMouseVisible = false;
base.Initialize();
}

protected override void LoadContent()
{
spriteBatch = new SpriteBatch(GraphicsDevice);

soldier = Content.Load(@”Images\Soldier”);
monster = Content.Load(@”Images\Monster”);
aim = Content.Load(@”Images\Aim”);
background = Content.Load(@”Images\skullfield”);
soldierPosition = new Vector2(GraphicsDevice.Viewport.Width / 2, GraphicsDevice.Viewport.Height / 2);
}

protected override void UnloadContent()
{
}

protected override void Update(GameTime gameTime)
{
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
this.Exit();

//Soldier Movement!!!!!

//Store the mouse state
MouseState mouse = Mouse.GetState();

aimPosition.X = mouse.X;
aimPosition.Y = mouse.Y;

//Calculate the distance from the square to the mouse’s X and Y position
float XDistance = soldierPosition.X – mouse.X;
float YDistance = soldierPosition.Y – mouse.Y;

//Calculate the required rotation by doing a two-variable arc-tan
rotation = (float)Math.Atan2(YDistance, XDistance);

if (XDistance > 20 || XDistance 20 || YDistance interval)
{
//If is incrememnt current frame
++currentFrame;

//Check frame is within direction frames, if not set back to standing
if (currentFrame >= 2)
{
currentFrame = 0;
}
//Reset timer
timer = 0f;
}
}
else
currentFrame = 0;

//Monster Movement!!!!!!

Rectangle soldierRect = new Rectangle((int)soldierPosition.X, (int)soldierPosition.Y, framesize.X, framesize.Y);

float mXDistance = monsterPosition.X – soldierRect.Location.X;
float mYDistance = monsterPosition.Y – soldierRect.Location.Y;

//Calculate the required rotation by doing a two-variable arc-tan
mrotation = (float)Math.Atan2(mYDistance, mXDistance);

//Move soldier towards mouse by closing the gap 3 pixels per update
monsterPosition.X -= (float)(1 * Math.Cos(mrotation));
monsterPosition.Y -= (float)(1 * Math.Sin(mrotation));

//Incremement timer using paramater
mtimer += (float)gameTime.ElapsedGameTime.TotalMilliseconds;

//Check if timer is greater than interval
if (mtimer > minterval)
{
//If is incrememnt current frame
++mcurrentFrame;

//Check frame is within direction frames, if not set back to standing
if (mcurrentFrame >= 4)
{
mcurrentFrame = 0;
}
//Reset timer
mtimer = 0f;
}

base.Update(gameTime);
}

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

spriteBatch.Begin(SpriteBlendMode.AlphaBlend,SpriteSortMode.FrontToBack,
SaveStateMode.None);

spriteBatch.Draw(aim,aimPosition, new Rectangle(0, 0, 20, 20), Color.White,
0,new Vector2(aim.Height /2,aim.Width/2),1, SpriteEffects.None, 0);

spriteBatch.Draw(soldier, soldierPosition, new Rectangle(currentFrame * framesize.X,
0, framesize.X, framesize.Y), Color.White, rotation,
new Vector2(framesize.X / 2, framesize.Y / 2), .7f, SpriteEffects.None, 0);

spriteBatch.Draw(background, new Rectangle(0, 0, Window.ClientBounds.Width, Window.ClientBounds.Height),
Color.White);

spriteBatch.Draw(monster, monsterPosition, new Rectangle(mcurrentFrame * mFramesize.X,
0, mFramesize.X, mFramesize.Y), Color.White, mrotation,
new Vector2(mFramesize.X / 2, mFramesize.Y / 2), .85f, SpriteEffects.None, 0);

spriteBatch.End();

base.Draw(gameTime);
}
}
}