update method

@override void update(double deltaSeconds)

Called once per frame while the component is mounted, enabled, and loaded. deltaSeconds is the elapsed time since the previous tick. A traversal visits each component at most once. Removing this component or an earlier sibling is safe. A component inserted before the current traversal position starts on the next frame. Reordering component or child lists during traversal is unsupported.

Implementation

@override
void update(double deltaSeconds) {
  final dt = clampDeltaSeconds(deltaSeconds);
  final lookR = smoothingResponse(dt);
  _yaw += (_yawGoal - _yaw) * lookR;
  _pitch += (_pitchGoal - _pitch) * lookR;

  final moveForward = moveVertical
      ? forward
      : (Vector3(forward.x, 0.0, forward.z)..normalize());
  final targetVelocity = Vector3.zero();
  if (_heldKeys.contains(LogicalKeyboardKey.keyW)) {
    targetVelocity.add(moveForward);
  }
  if (_heldKeys.contains(LogicalKeyboardKey.keyS)) {
    targetVelocity.sub(moveForward);
  }
  // D moves toward the camera's right side of the screen; A moves left.
  if (_heldKeys.contains(LogicalKeyboardKey.keyD)) targetVelocity.sub(_right);
  if (_heldKeys.contains(LogicalKeyboardKey.keyA)) targetVelocity.add(_right);
  if (moveVertical) {
    if (_heldKeys.contains(LogicalKeyboardKey.keyE)) {
      targetVelocity.add(Vector3(0.0, 1.0, 0.0));
    }
    if (_heldKeys.contains(LogicalKeyboardKey.keyQ)) {
      targetVelocity.sub(Vector3(0.0, 1.0, 0.0));
    }
  }
  final boosted =
      _heldKeys.contains(LogicalKeyboardKey.shiftLeft) ||
      _heldKeys.contains(LogicalKeyboardKey.shiftRight);
  if (targetVelocity.length2 > 1e-12) {
    targetVelocity
      ..normalize()
      ..scale(speed * (boosted ? boostMultiplier : 1.0));
  }
  final moveR = settleResponse(movementSmoothing, dt);
  _velocity.addScaled(targetVelocity - _velocity, moveR);
  if (_velocity.length2 > 1e-12) _position.addScaled(_velocity, dt);

  node.lookAtFrom(_position, _position + forward);
}