public bool UpdateAndCheckIfRedrawRequired()
{
if (_showSceneControl.RenderSetup == null)
{
return(false);
}
// Stop all transitions when switching between camera-ops
if (_showSceneControl.RenderSetup.CurrentCameraOp != _cameraOperator)
{
_cameraOperator = _showSceneControl.RenderSetup.CurrentCameraOp;
_cameraPositionGoal = _showSceneControl.RenderSetup.CameraPosition;
_cameraTargetGoal = _showSceneControl.RenderSetup.CameraTarget;
MoveVelocity = Vector3.Zero;
_isTransitionActive = false;
}
// This is an extremely unfortunate solution to check if the camera has been manipulated from the
// outside (e.g. by another view, parameters or animation)
if (!_isTransitionActive && (PositionDistance.Length() > STOP_DISTANCE_THRESHOLD || TargetDistance.Length() > STOP_DISTANCE_THRESHOLD))
{
_cameraPositionGoal = _showSceneControl.RenderSetup.CameraPosition;
_cameraTargetGoal = _showSceneControl.RenderSetup.CameraTarget;
return(true);
}
var redrawRequired = false;
UpdateRawMouseData();
if (_lockInteraction)
{
return(false);
}
_lockInteraction = true;
// Manipulation...
redrawRequired |= ManipulateGizmos();
if (_showSceneControl.RenderSetup.TransformGizmo.State != TransformGizmo.TransformGizmo.GizmoStates.Dragged)
{
ManipulateCameraByMouse();
}
_manipulatedByKeyboard = ManipulateCameraByKeyboard();
_spaceMouse.ManipulateCamera();
// Transition...
redrawRequired |= ComputeCameraMovement();
_lockInteraction = false;
return(redrawRequired);
}
/*
* Returns false if camera didn't move
*/
private bool ComputeCameraMovement()
{
var frameDurationFactor = (float)(App.Current.TimeSinceLastFrame) / FRAME_DURATION_AT_60_FPS;
if (PositionDistance.Length() > STOP_DISTANCE_THRESHOLD ||
TargetDistance.Length() > STOP_DISTANCE_THRESHOLD ||
MoveVelocity.Length() > STOP_DISTANCE_THRESHOLD ||
_lookingAroundDelta.Length() > STOP_DISTANCE_THRESHOLD ||
_manipulatedByMouseWheel ||
_orbitDelta.Length() > 0.001f ||
_manipulatedByKeyboard)
{
if (_orbitDelta.Length() > 0.001f)
{
OrbitByAngle(_orbitDelta);
_orbitDelta *= new Vector2(ORBIT_HORIZONTAL_FRICTION, ORBIT_VERTICAL_FRICTION) / frameDurationFactor;
}
if (MoveVelocity.Length() > MaxMoveVelocity)
{
MoveVelocity *= MaxMoveVelocity / MoveVelocity.Length();
}
else if (!_manipulatedByKeyboard)
{
MoveVelocity *= (1 - _frictionKeyboardManipulation) / frameDurationFactor;
}
_cameraPositionGoal += MoveVelocity;
_cameraTargetGoal += MoveVelocity + _lookingAroundDelta;
_lookingAroundDelta = Vector3.Zero;
PositionDistance *= CAMERA_MOVE_FRICTION / frameDurationFactor;
TargetDistance *= CAMERA_MOVE_FRICTION / frameDurationFactor;
_isTransitionActive = true;
_manipulatedByMouseWheel = false;
return(true);
}
else
{
StopTransitionOfPositionTarget();
_isTransitionActive = false;
return(false);
}
}
/**
* WPF will discard some mouse-wheel events on slow framerates which leads to a laggy
* interaction in complex scenes. For that reason, we include the framerate into the zoom-speed
* and -- sadly -- avoid transitions for for zooming.
*/
public void HandleMouseWheel(float delta)
{
var transitionActive = PositionDistance.Length() > STOP_DISTANCE_THRESHOLD || TargetDistance.Length() > STOP_DISTANCE_THRESHOLD;
var viewDirection = transitionActive ? _cameraPositionGoal - _cameraTargetGoal
: _showSceneControl.RenderSetup.CameraPosition - _showSceneControl.RenderSetup.CameraTarget;
var frameDurationFactor = (float)(App.Current.TimeSinceLastFrame) / FRAME_DURATION_AT_60_FPS;
var zoomFactorForCurrentFramerate = 1 + (ZOOM_SPEED * frameDurationFactor);
if (delta < 0)
{
viewDirection *= zoomFactorForCurrentFramerate;
}
else
{
viewDirection /= zoomFactorForCurrentFramerate;
}
_showSceneControl.RenderSetup.CameraPosition = _cameraPositionGoal = _cameraTargetGoal + viewDirection;
_manipulatedByMouseWheel = true;
}
