private static Vector3[] CreatePositions()
{
var top = new Vector3(0f, 1f, 0f);
var left = new Vector3(-1f, -1f, 0f);
var right = new Vector3(1f, -1f, 0f);
return new[] { top, right, left };
}
private static Vector3[] CreateColors()
{
var top = new Vector3(1f, 0f, 0f);
var left = new Vector3(0f, 1f, 0f);
var right = new Vector3(0f, 0f, 1f);
return new[] { top, right, left };
}
public void Up_set_and_get()
{
var stand = new Stand();
var up = new Vector3(1, 2, 3);
stand.Up = up;
Assert.AreEqual(up, stand.Up);
}
public void Position_set_and_get()
{
var stand = new Stand();
var position = new Vector3(7, 8, 9);
stand.Position = position;
Assert.AreEqual(position, stand.Position);
}
public void Direction_set_and_get()
{
var stand = new Stand();
var direction = new Vector3(4, 5, 6);
stand.Direction = direction;
Assert.AreEqual(direction, stand.Direction);
}
private static Vector3[] CreateColors()
{
var topLeft = new Vector3(1f, 0f, 0f);
var topRight = new Vector3(0f, 1f, 0f);
var bottomLeft = new Vector3(0f, 0f, 1f);
var bottomRight = new Vector3(1f, 1f, 0f);
return new[] { topLeft, topRight, bottomLeft, bottomRight };
}
private static Vector3[] CreatePositions()
{
var topLeft = new Vector3(-1f, 1f, 0f);
var topRight = new Vector3(1f, 1f, 0f);
var bottomLeft = new Vector3(-1f, -1f, 0f);
var bottomRight = new Vector3(1f, -1f, 0f);
return new[] { topLeft, topRight, bottomLeft, bottomRight };
}
public void Constructor_from_a_vector_sets_XYZ_to_the_vector_values_and_W_to_0()
{
var vector3 = new Vector3(1, 2, 3);
var quaternion = new Quaternion(vector3);
quaternion.W.ShouldEqual(0);
quaternion.X.ShouldEqual(vector3.X);
quaternion.Y.ShouldEqual(vector3.Y);
quaternion.Z.ShouldEqual(vector3.Z);
}
/// <summary>
/// Calculates the view matrix.
/// </summary>
/// <param name="position">The position.</param>
/// <param name="direction">The direction.</param>
/// <param name="up">The up direction.</param>
/// <returns>The calculated view matrix.</returns>
public static Matrix CalculateViewMatrix(Vector3 position, Vector3 direction, Vector3 up)
{
var n = -direction.Normalized();
var u = up.Cross(n).Normalized();
var v = n.Cross(u);
var e = -position;
return new Matrix(
u.X, v.X, n.X, 0,
u.Y, v.Y, n.Y, 0,
u.Z, v.Z, n.Z, 0,
u.Dot(e), v.Dot(e), n.Dot(e), 1);
}
public void CalcualteViewMatrix_with_simple_values()
{
var position = new Vector3(0, 0, 3);
var direction = new Vector3(0, 0, -1);
var up = new Vector3(0, 1, 0);
var view = Stand.CalculateViewMatrix(position, direction, up);
var xna = Microsoft.Xna.Framework.Matrix.CreateLookAt(
position.ToXna(), (position + direction).ToXna(), up.ToXna());
Assert.AreEqual(xna.ToMath(), view);
}
