public abstract void Update(UIContext uiContext);
public override void Update(UIContext uiContext)
{
// update mouse look vector, for now, let's assume that we'll want to track the mouse perfectly
Vector2 relative = uiContext.ScreenCenter;
if (uiContext.MouseDiffVector2.Length() < 100) // ignore game startup snap
{
relative += uiContext.MouseDiffVector2 * 3;
}
Matrix world = Matrix.Identity;
Matrix view = GetView();
Matrix projection = Matrix.CreatePerspectiveFieldOfView((float)(Math.PI / 4), uiContext.AspectRatio, 0.01f, 10f);
Vector3 unprojected = uiContext.Unproject(new Vector3(relative.X, relative.Y, 0.25f), projection, view, world);
Vector3 unprojected2 = uiContext.Unproject(new Vector3(relative.X, relative.Y, 0.75f), projection, view, world);
var newCameraLookUnitVector = unprojected2 - unprojected;
newCameraLookUnitVector.Normalize();
cameraLookUnitVector = newCameraLookUnitVector;
float walkSpeed = 4.317f;
float ascendSpeed = walkSpeed; // not sure
// minecraft walk speed is about 4.317 m/s, sprint is 5.612, jump-sprint is 7.143, fly is 10.92, fly-sprint is 21.6
Vector3 flatCameraLookUnitVector = new Vector3(cameraLookUnitVector.X, 0, cameraLookUnitVector.Z);
flatCameraLookUnitVector.Normalize();
// TODO: I guess this is counter-clockwise around y-axis??
Vector3 flatRightUnitVector = Vector3.Transform(flatCameraLookUnitVector, Matrix.CreateRotationY((float)(-Math.PI / 2)));
float forwardAmount = 0;
float rightAmount = 0;
float upAmount = 0;
if (Keyboard.GetState().IsKeyDown(Keys.W) || Keyboard.GetState().IsKeyDown(Keys.Up))
{
forwardAmount++;
}
if (Keyboard.GetState().IsKeyDown(Keys.S) || Keyboard.GetState().IsKeyDown(Keys.Down))
{
forwardAmount--;
}
if (Keyboard.GetState().IsKeyDown(Keys.D) || Keyboard.GetState().IsKeyDown(Keys.Right))
{
rightAmount++;
}
if (Keyboard.GetState().IsKeyDown(Keys.A) || Keyboard.GetState().IsKeyDown(Keys.Left))
{
rightAmount--;
}
if (Keyboard.GetState().IsKeyDown(Keys.Space))
{
upAmount++;
}
if (Keyboard.GetState().IsKeyDown(Keys.LeftShift))
{
upAmount--;
}
float len = (float)Math.Sqrt(forwardAmount * forwardAmount + rightAmount * rightAmount);
if (len > 0)
{
forwardAmount /= len;
rightAmount /= len;
}
cameraPosition += flatCameraLookUnitVector * forwardAmount * (float)uiContext.ElapsedSeconds * walkSpeed;
cameraPosition += flatRightUnitVector * rightAmount * (float)uiContext.ElapsedSeconds * walkSpeed;
cameraPosition += Vector3.Up * upAmount * (float)uiContext.ElapsedSeconds * ascendSpeed;
uiContext.CenterMouse();
}