source: 2014/30/MikkoI/WindowsGame1/WindowsGame1/WindowsGame1/Camera/Camera.cs @ 5581

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

namespace WindowsGame1
{
    public class Camera
    {
        public Vector2 offset = Vector2.Zero;
        public float zoomFactor = 1;
        public float pitch = -45;
        public float yaw = 0;
        public Camera()
        {

        }
        public Matrix getMatrix(Vector2 gridSize, Vector2 mapSize, Vector2 screenSize)
        {
            viewPortBounds();

            Vector3 pixelMapSize = new Vector3((gridSize.X * mapSize.X / 2), (gridSize.Y * mapSize.Y / 2), 0);
            return Matrix.CreateTranslation(new Vector3(-pixelMapSize.X + offset.X, -pixelMapSize.Y + offset.Y, 0)) *
                Matrix.CreateRotationZ(MathHelper.ToRadians(45 + yaw)) *
                Matrix.CreateRotationX(MathHelper.ToRadians(pitch)) *
                Matrix.CreateScale(zoomFactor, zoomFactor, 0) *
                Matrix.CreateTranslation(new Vector3(screenSize.X / 2, screenSize.Y / 2, 0));
        }
        void viewPortBounds()
        {
            //rajoittaa viewporttia

            //if (yaw < -70) { yaw = -70; } else if (yaw > 70) { yaw = 70; }//rajoita pyörittämistä (-70 - 70)
            if (pitch < -88) { pitch = -88; } else if (pitch > -45) { pitch = -45; }//rajoittaa ylös-alas-liikettä
            if (zoomFactor < 0.4f) { zoomFactor = 0.4f; } else if (zoomFactor > 3f) { zoomFactor = 3f; }//rajoittaa zoomia
        }
    }
}