Camera.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Graphics;

namespace The_Calling
{
        public class Camera
        {
            public Matrix viewMatrix;
            private Vector2 m_position;
            private Vector2 m_halfViewSize;

            public Camera(Rectangle clientRect)
            {
                m_halfViewSize = new Vector2(clientRect.Width * 0.5f, clientRect.Height * 0.5f);
                UpdateViewMatrix();
            }

            public Vector2 Pos
            {
                get
                {
                    return m_position;
                }

                set
                {
                    m_position = value;
                    UpdateViewMatrix();
                }
            }

            private void UpdateViewMatrix()
            {
                viewMatrix = Matrix.CreateTranslation(m_halfViewSize.X - m_position.X, m_halfViewSize.Y - m_position.Y, 0.0f);
            }
        }
}