protected override bool OnMouseDown(MouseDownEvent e)
{
ScreenSpaceDragPosition = e.ScreenSpaceMousePosition;
DragPosition = HitObject.ToLocalSpace(e.ScreenSpaceMousePosition);
return(base.OnMouseDown(e));
}
protected override bool OnDrag(DragEvent e)
{
var result = base.OnDrag(e);
ScreenSpaceDragPosition = e.ScreenSpaceMousePosition;
DragPosition = HitObject.ToLocalSpace(e.ScreenSpaceMousePosition);
return(result);
}