C:/Doug/CSharp/XnaCollisionLib/XnaCollisionLib/Utils/Camera.cs

Go to the documentation of this file.

using System;
using Microsoft.Xna.Framework;

namespace XnaCollisionLib.Utils
{
    public class Camera
    {
        public Camera()
        {
            Position = new Vector3(0, 1, 0);
            Target = new Vector3(0, 0, 0);
            Up = new Vector3(0, 0, 1);
            Aspect = 800.0f / 600.0f;
            FieldOfView = 60;
            NearPlane = 1;
            FarPlane = 5000;
        }

        public Vector3 Position
        {
            get;
            set;
        }

        public Vector3 Target
        {
            get;
            set;
        }

        public Vector3 Up
        {
            get;
            set;
        }

        public float Aspect
        {
            get;
            set;
        }

        public float FieldOfView
        {
            get;
            set;
        }

        public float NearPlane
        {
            get;
            set;
        }

        public float FarPlane
        {
            get;
            set;
        }

        public Matrix View
        {
            get { return Matrix.CreateLookAt(Position, Target, Vector3.Normalize(Up)); }
        }

        public Matrix Projection
        {
            get { return Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(FieldOfView), Aspect, NearPlane, FarPlane); }
        }

        public void RotateAroundPosition(Vector2 d, Vector3 rotationAxis)
        {
            Vector3 f = Vector3.Normalize(Target - Position);
            Vector3 u = Vector3.Normalize(Up);
            Vector3 r = Vector3.Normalize(Vector3.Cross(f, u));
            Matrix rot = Matrix.CreateFromAxisAngle(rotationAxis, MathHelper.ToRadians(d.X));

            f = Vector3.TransformNormal(f, rot);
            r = Vector3.TransformNormal(r, rot);
            u = Vector3.Normalize(Vector3.Cross(r, f));
            rot = Matrix.CreateFromAxisAngle(r, MathHelper.ToRadians(d.Y));
            Target = Position + Vector3.TransformNormal(f, rot);
            Up = Vector3.TransformNormal(u, rot);
        }
    }
}