using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework;
using XnaGraphicEngine.Helpers;

namespace XnaGraphicEngine.Game
{
	/// <summary>
	/// Simple camera class just to move around a little.
	/// Always focuses on the center and uses the same height.
	/// </summary>
	class SimpleCamera : GameComponent
	{
		#region Variables
		float x = 0, y = 0;
		float zHeight = 15.0f;
		#endregion

		#region Constructor
		public SimpleCamera(BaseGame game)
			: base(game)
		{
		} // SimpleCamera(game)
		#endregion

		#region Initialize
		public override void Initialize()
		{
			base.Initialize();
		} // Initialize
		#endregion

		#region Update
		public override void Update(GameTime gameTime)
		{
			base.Update(gameTime);

			// Update camera position (allow mouse and gamepad)
			x += Input.MouseXMovement / 10;
			y += Input.MouseYMovement / 10;
			x += Input.GamePad.ThumbSticks.Right.X;
			y += Input.GamePad.ThumbSticks.Right.Y;
			zHeight += Input.GamePad.ThumbSticks.Left.Y;
			zHeight += Input.MouseWheelDelta / 20;
			BaseGame.ViewMatrix = Matrix.CreateLookAt(
				new Vector3(x, y, zHeight), Vector3.Zero, Vector3.Up);
		} // Update(gameTime)
		#endregion
	} // class SimpleCamera
} // namespace XnaGraphicEngine.Game