public void Update(TargetCamera camera)
{
if (UpdateFunc != null)
{
UpdateFunc(camera, this.oldMouseState, this.oldKeyboardState);
}
}
private void ArcBall(TargetCamera camera)
{
var position = camera.Position;
var target = camera.Target;
var newMouseState = Mouse.GetState();
var newKeyboardState = Keyboard.GetState();
var mouseDelta = new Vector2(newMouseState.X - oldMouseState.X, newMouseState.Y - oldMouseState.Y);
Vector3 lookAtVector = position - target;
var up = Vector3.UnitY;
if (newMouseState.LeftButton == ButtonState.Pressed && oldMouseState.LeftButton == ButtonState.Pressed)
{
Vector3 screenXAxis = Vector3.Cross(lookAtVector, up).Normalized();
Vector3 screenYAxis = Vector3.Cross(screenXAxis, lookAtVector).Normalized();
var moveDelta = 0.1f * (mouseDelta.X * screenXAxis + mouseDelta.Y * screenYAxis);
var directionVector = (lookAtVector + moveDelta).Normalized();
if (newKeyboardState.IsKeyDown(Key.ShiftLeft))
{
directionVector *= lookAtVector.Length;
position = target + directionVector;
target += moveDelta;
}
else
{
directionVector *= lookAtVector.Length;
position = target + directionVector;
}
}
if (newKeyboardState.IsKeyDown(Key.PageDown))
{
if (!oldKeyboardState.IsKeyDown(Key.PageDown))
{
lookAtVector *= 1.1f;
position = target + lookAtVector;
}
}
if (newKeyboardState.IsKeyDown(Key.PageUp))
{
if (!oldKeyboardState.IsKeyDown(Key.PageUp))
{
var wheelDelta = newMouseState.ScrollWheelValue - oldMouseState.ScrollWheelValue;
lookAtVector *= (1.0f / 1.1f);
position = target + lookAtVector;
}
}
oldMouseState = newMouseState;
oldKeyboardState = newKeyboardState;
camera.Position = position;
camera.Target = target;
}
private void FPS(TargetCamera camera)
{
var position = camera.Position;
var target = camera.Target;
var newMouseState = Mouse.GetState();
var newKeyboardState = Keyboard.GetState();
var bounds = Game.Current.Bounds;
var directionVector = (target - position).Normalized();
float halfScreen = (bounds.Top - bounds.Bottom) / 2;
float angleScreenRatio = 45.0f / halfScreen;
var mouseDelta = new Vector2(newMouseState.X - oldMouseState.X, newMouseState.Y - oldMouseState.Y);
var angleDelta = angleScreenRatio * mouseDelta;
var up = Vector3.UnitY;
Mouse.SetPosition(0.5 * (bounds.Left + bounds.Right), 0.5 * (bounds.Top + bounds.Bottom));
oldMouseState = newMouseState;
oldKeyboardState = newKeyboardState;
camera.Position = position;
camera.Target = target;
}
