public override void UpdateView()
{
if (effect != null)
{
FreeLook freelook = Demo.Freelook;
effect.View = Matrix.CreateLookAt(MathHelper.Convert(freelook.Eye), MathHelper.Convert(freelook.Target), MathHelper.Convert(freelook.Up));
effect.View *= Matrix.CreateScale(-1, 1, 1);
}
}
protected override void Initialize()
{
basicEffect = new BasicEffect(GraphicsDevice);
basicEffect.TextureEnabled = true;
basicEffect.VertexColorEnabled = true;
basicEffect.View = XNAMatrix.CreateLookAt(
orgCameraPosition,
XNAVector3.Zero,
XNAVector3.Up
);
basicEffect.Projection = XNAMatrix.CreatePerspectiveFieldOfView(
XNAMathHelper.ToRadians(45.0f),
(float)GraphicsDevice.Viewport.Width / GraphicsDevice.Viewport.Height,
1.0f,
10000.0f
);
basicEffect.Texture = null;
dummyTexture = XNATexture.Load(GraphicsDevice, "./dummyTexture.png");
}
void UpdateCamera(Matrix transform)
{
float ox = transform.OffsetX;
float oy = transform.OffsetY;
float scale = transform.Elements.ElementAt(0);
Console.WriteLine(string.Format("({0}, {1}), {2}", ox, oy, scale));
if (scale <= 0)
{
return;
}
XNAVector3 zoomCamPos = orgCameraPosition;
zoomCamPos.Z /= scale;
var zoomView = XNAMatrix.CreateLookAt(
zoomCamPos,
XNAVector3.Zero,
XNAVector3.Up
);
XNAVector3 offset = new XNAVector3(ox, oy, 0);
XNAVector3 p0 = Unproject(XNAVector3.Zero, basicEffect.Projection, zoomView, XNAMatrix.Identity, zoomCamPos);
XNAVector3 p1 = Unproject(offset, basicEffect.Projection, zoomView, XNAMatrix.Identity, zoomCamPos);
cameraPosition = p0 - p1;
cameraPosition.Z = zoomCamPos.Z;
XNAVector3 targetPos = cameraPosition;
targetPos.Z = 0;
basicEffect.View = XNAMatrix.CreateLookAt(
cameraPosition,
targetPos,
XNAVector3.Up
);
}
/// <summary>
/// Calculates the <see cref="ViewMatrix"/> by creating a look-at Matrix.
/// </summary>
/// <returns>A <see cref="Microsoft.Xna.Framework.Matrix"/> representing the View matrix of the CameraComponent.</returns>
internal Matrix CalculateViewMatrix()
{
var forward = Vector3.Transform(Vector3.Forward, RotationQuaternion);
var up = Vector3.Transform(Vector3.Up, RotationQuaternion);
if (IsInitialized)
{
if (Target == null)
{
forward = WorldPosition + forward;
}
else
{
forward = Target.Position;
}
}
return(Matrix.CreateLookAt(
WorldPosition.MonoGameVector,
forward.MonoGameVector,
up.MonoGameVector
));
}
public static Matrix CreateLookAt(Vector3 pos, Vector3 target, Vector3 up)
{
return(new Matrix(Matrix4x4.CreateLookAt(pos, target, up)));
}