The Camera Class

This is the Camera Class you will need for the Demo


Note that the full visual studio project can be downloaded from source forge
https://sourceforge.net/projects/aphysicsengine/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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;
using PhysicsEngine;

namespace WindowsGame1
{
    public class Camera
    {

        public Vector3 cameraPosition, cameraTarget, cameraUpVector;
        public float fieldOfView, aspectRatio, nearPlaneDistance, farPlaneDistance;

        public Camera(Vector3 cameraPosition, Vector3 cameraTarget, Vector3 cameraUpVector, float fieldOfView, float aspectRatio, float nearPlaneDistance, float farPlaneDistance)
        {
            this.cameraPosition = cameraPosition;
            this.cameraTarget = cameraTarget;
            this.cameraUpVector = cameraUpVector;
            this.fieldOfView = fieldOfView;
            this.aspectRatio = aspectRatio;
            this.nearPlaneDistance = nearPlaneDistance;
            this.farPlaneDistance = farPlaneDistance;
        }

        public Matrix View
        {
            get
            {
                return Matrix.CreateLookAt(cameraPosition, cameraTarget, cameraUpVector);
            }
        }

        public Matrix Projection
        {
            get
            {
                return Matrix.CreatePerspectiveFieldOfView
                (
                    fieldOfView,
                    aspectRatio,
                    nearPlaneDistance,
                    farPlaneDistance
                );
            }
        }

        public void Draw(DefaultEntity entity, Model model)
        {
            Matrix[] boneTransforms = new Matrix[model.Bones.Count];
            Matrix rotation = entity.Rotation;
            Matrix position = Matrix.CreateTranslation(entity.Position);
            model.Root.Transform = Matrix.Identity * rotation * position;
            model.CopyAbsoluteBoneTransformsTo(boneTransforms);

            foreach (ModelMesh mesh in model.Meshes)
            {
                foreach (BasicEffect effect in mesh.Effects)
                {
                    effect.EnableDefaultLighting();
                    effect.World = boneTransforms[mesh.ParentBone.Index];
                    effect.View = this.View;
                    effect.Projection = this.Projection;
                }
                mesh.Draw();
            }
        }
    }
}