namespace Learning1
{

public class Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager graphics;

SpriteBatch spriteBatch;

KeyboardState newstate;

public class Camera2d
{
protected float _zoom; // Camera Zoom
public Matrix _transform; // Matrix Transform
public Vector2 _pos; // Camera Position
protected float _rotation; // Camera Rotation

public Camera2d()
{
_zoom = 1.0f;
_rotation = 0.0f;
_pos = Vector2.Zero;
}

}

// Sets and gets zoom
public float Zoom
{
get { return _zoom; } // Error
set { _zoom = value; if (_zoom < 0.1f) _zoom = 0.1f; } //Error Negative zoom will flip image
}

public float Rotation
{
get { return _rotation; }
set { _rotation = value; }
}

// Auxiliary function to move the camera
public void Move(Vector2 amount)
{
_pos += amount; // _pos (no ex)tension method to contain argument
}
// Get set position
public Vector2 Pos
{
get { return _pos; }
set { _pos = value; }
}

public Matrix get_transformation(GraphicsDevice graphicsDevice)
{
_transform =
Matrix.CreateTranslation(new Vector3(-_pos.X, -_pos.Y, 0)) *
Matrix.CreateRotationZ(Rotation) *
Matrix.CreateScale(new Vector3(Zoom, Zoom, 1)) *
Matrix.CreateTranslation(new Vector3(ViewportWidth * 0.5f, ViewportHeight * 0.5f, 0));
return _transform;
}

public Game1()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";

}

protected override void Initialize()
{
// TODO: Add your initialization logic here

base.Initialize();

}

Texture2D myTexture;
Vector2 Posp = new Vector2();

Vector2 spritePosition = Vector2.Zero;

Vector2 spriteSpeed = new Vector2(50.0f, 50.0f);

protected override void LoadContent()
{

spriteBatch = new SpriteBatch(GraphicsDevice);
myTexture = Content.Load(“orange”);

}

protected override void UnloadContent()
{

}

protected override void Update(GameTime gameTime)
{

KeyboardState newstate = Keyboard.GetState();

if (newstate.IsKeyDown(Keys.Right))
{
Posp.X += 1;
}

else if (newstate.IsKeyDown(Keys.Left))
{
Posp.X -= 1;
}

else if (newstate.IsKeyDown(Keys.Up))
{
Posp.Y -= 1;
}

else if (newstate.IsKeyDown(Keys.Down))
{
Posp.Y += 1;
}

}

protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.CornflowerBlue);
Camera2d cam = new Camera2d();
cam.Pos = new Vector2(500.0f, 200.0f);

spriteBatch.Begin(SpriteSortMode.BackToFront,
BlendState.AlphaBlend,
null,
null,
null,
null,
cam.get_transformation(device /*Send the variable that has your graphic device here*/));
spriteBatch.Draw(myTexture, Pos, Color.White);
spriteBatch.End();

base.Draw(gameTime);
}
}
}

hi , i really need help with that as i managed to move the char but when i am applying ur code to create the camera to my char it keep giving me error about the 4 variables ( _Pos , _zoom , _ rotation , _transform) beside the ( cam.get_transformation(device

[...]XNA Camera 2d with zoom and rotation | David Amador[...]…

Great code but i am wondering,
Is there a way to see if an object is in/out sight of the camera??

Thanks

Awesome job commenters on the contributions! Special thanks to Tux89 for the code to translate vectors between local and world. Works like a charm. Now, there must be a way to move the camera’s position intuitively based on screen orientation while rotated instead of based on world coordinates.

First of all, great tutorial. And great comments to. It´s a nice contribution.

But I still dont get one thing. This “problem” has been said here. When I rotate my camera and press the button to go to the right, I would like to go to the right of the screen, not to the right of the camera, making my scene go “up”, for example.

I figure out that I must use the method Move of the camera object with a parameter regarding the rotation of this camera, but I missed out the calculations…

Any help?

Thanks a lot.

You need those:

Camera2D cam = new Camera2D();
MouseState old_mouse;
 
 
In the "void Update":
 
            if (Mouse.GetState().LeftButton == ButtonState.Pressed)
            {
                cam.Move(new Vector2((Mouse.GetState().X - old_mouse.X) * -0.5f, (Mouse.GetState().Y - old_mouse.Y) * -0.5f));
            }
 
            if (Mouse.GetState().ScrollWheelValue != old_mouse.ScrollWheelValue)
            {
                if (cam.Zoom > 1)
                {
                    cam.Zoom += (Mouse.GetState().ScrollWheelValue - old_mouse.ScrollWheelValue) / 120.0f / 10.0f;
                }
                else
                {
                    cam.Zoom *= 1+(Mouse.GetState().ScrollWheelValue - old_mouse.ScrollWheelValue) / 120.0f / 20.0f;
                }
            }
            if (Mouse.GetState().RightButton  == ButtonState.Pressed)
            {
                cam.Rotation += ((Mouse.GetState().X - old_mouse.X) / 500.0f);
                cam.Rotation += ((Mouse.GetState().Y - old_mouse.Y) / 500.0f);
            }
 
            old_mouse = Mouse.GetState();

Hope html works here…