/Rendering/CameraTests/FreeCameraTests.cs

using Delta.Engine;

using Delta.Rendering.Cameras;

using Delta.Rendering.Models;

using Delta.Utilities.Datatypes;

using Delta.InputSystem;

using Delta.InputSystem.Devices;

using Delta.Utilities.Helpers;



namespace Delta.Rendering.CameraTests

{

	using Delta.Rendering.Basics.Drawing;

	using Delta.Rendering.Basics.Fonts;



	using NUnit.Framework;



	/// <summary>

	/// All unit tests for free cameras.

	/// </summary>

	public class FreeCameraTests

	{

		#region TestUpdateProjectionMatrix

		/// <summary>

		/// Test from BFoxX from the Forum to test changing camera values.

		/// </summary>

		[Test]

		public static void TestUpdateProjectionMatrix()

		{

			BaseCamera cam = new FreeCamera(new Vector(0, -10, 0));

			cam.Target = new Vector(0, 0, 0);

			cam.FieldOfView = MathHelper.DegreeToRadians(90);

			cam.NearPlane = 1; //work

			cam.FarPlane = 10; //work

			var halfSize = new Vector(3, 3, 3);



			string text;

			Application.Start(delegate

			{

				Grid.Draw();

				text = ScreenSpace.InternalViewProjection3D.Translation.ToString();

				//Look after zoom (unzoom) 

				//if camera 0 -10 0         TranslationZ   10

				//ater

				//if camera 0 -10 0         TranslationZ   8.1818 ----



				var point = new Point(0f, 0.5f);

				text += "\n Position" + cam.Position;

				text += "\n FarPlane" + cam.FarPlane;

				text += "\n Point in" + point;

				Ray ray = ScreenSpace.GetRayFromScreenPoint(point);

				Vector end = ray.Direction + ray.Position;

				point = new Point(end.X, end.Z);

				text += "\n Point on grid" + point;



				Vector vector = ScreenSpace.Project(new Vector(point.X, 0, point.Y));

				text += "\n vector" + vector;



				ray = ScreenSpace.GetRayFromScreenPoint(new Point(vector.X, vector.Y));

				end = ray.Direction + ray.Position;

				point = new Point(end.X, end.Z);

				text += "\n 2 Point on grid" + point;



				vector = ScreenSpace.Project(new Vector(point.X, 0, point.Y));

				text += "\n vector" + vector;

				

				Font.DrawTopLeftInformation(text);



				if (Input.Keyboard.IsReleased(InputButton.A))

				{

					cam.Position -= new Vector(0, 0.01f, 0);

					cam.UpdateProjectionMatrix();

					cam.FarPlane = -cam.Position.Y;

					cam.UpdateProjectionMatrix();

				}

				if (Input.Keyboard.IsReleased(InputButton.S))

				{

					cam.Position += new Vector(0, 0.01f, 0);

					cam.UpdateProjectionMatrix();

					cam.FarPlane = -cam.Position.Y;

					cam.UpdateProjectionMatrix();

				}

			});

		}

		#endregion

	}

}