Drawing a basic radar

gistfile1.cs

 Matrix radarTrans = Matrix.CreateScale(0.04f);
            Matrix radarScreenTrans = Matrix.CreateScale(0.3f);

//draw radar background            
spriteBatch.Begin(SpriteSortMode.Immediate, null, null, null, null, null, radarScreenTrans);
            spriteBatch.Draw(radar, Vector2.Zero, Color.White);
            spriteBatch.End();

//draw world entities
            spriteBatch.Begin(SpriteSortMode.Immediate, null, null, null, null, null, radarTrans);
            foreach (Sprite s in sprites)
                s.Draw(gameTime, spriteBatch, true);
            spriteBatch.End();

//draw radar mask
            spriteBatch.Begin(SpriteSortMode.Immediate, null, null, null, null, null, radarScreenTrans);
            spriteBatch.Draw(radar_mask, Vector2.Zero, Color.White);
            spriteBatch.End();