private void SetupToTrackball()
{
Model3DGroup model = new Model3DGroup();
// Major arrow along x
model.Children.Add(TrackballGrabber.GetMajorArrow(Axis.X, true, _colors.TrackballAxisMajor_To, _colors.TrackballAxisSpecular));
// Minor arrow along z
model.Children.Add(TrackballGrabber.GetMinorArrow(Axis.Z, true, _colors.TrackballAxisMinor_To, _colors.TrackballAxisSpecular));
ModelVisual3D visual = new ModelVisual3D();
visual.Content = model;
_viewportTo.Children.Add(visual);
_orientationVisualsTo.Add(visual);
// Create the trackball
_orientationTrackballTo = new TrackballGrabber(grdTo, _viewportTo, 1d, _colors.TrackballGrabberHoverLight);
_orientationTrackballTo.SyncedLights.Add(_cameraToLight);
_orientationTrackballTo.RotationChanged += new EventHandler(OrientationTrackballTo_RotationChanged);
// Faint lines
_orientationTrackballTo.HoverVisuals.Add(TrackballGrabber.GetGuideLine(Axis.X, false, _colors.TrackballAxisLine_To));
_orientationTrackballTo.HoverVisuals.Add(TrackballGrabber.GetGuideLineDouble(Axis.Y, _colors.TrackballAxisLine_To));
_orientationTrackballTo.HoverVisuals.Add(TrackballGrabber.GetGuideLine(Axis.Z, false, _colors.TrackballAxisLine_To));
}
private static void EnsureSnapped45(TrackballGrabber trackball)
{
//TODO: I think this is invalid thinking. Instead?:
// Use the quaternion to project a vector
// Snap that projected vector to the nearest aligned vector
// Get a new quaternion that describes how to rotate to that snapped vector
//TODO: When the trackball's transform is set, the lights get screwed up
Quaternion currentOrientation = trackball.Transform.ToQuaternion();
// Snap the axis to nearest 45
Vector3D snappedAxis = currentOrientation.Axis;
// Snap the angle to nearest 45
double snappedAngle = GetSnappedAngle(currentOrientation.Angle, 45d);
trackball.Transform = new RotateTransform3D(new AxisAngleRotation3D(snappedAxis, snappedAngle));
}
