[vtkusers] How to forward mouse move event to polydata algorithm and get there direction of projection

[Jana Sefcikova]

Hi all,

I would like inform my polydata algorithm about change of direction of
projection.
How it could be realised ?

I am attaching my code. As an example of polydata algorithm I inherited
from vtkSphereSource and method that I do not know connect to the rest is
MySphereSource::printDirectionOfProjection.

- One way could be put the vtkInteractorStyleTrackballCamera style ( or
someone else ?) into algorithm as widgets do, but this does not seam to me
very nice.
- Opposite way could be add algorithm's observer to the style such
as vtkCameraObserver in the code. But this method looks like eating the
event -> sphere doesn't rotate anymore and I do not know how to
get GetDirectionOfProjection there . Do you have any idea why ?

What could be correct ?

Thanks in advance
Jana
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cmake_minimum_required(VERSION 2.6)
 
PROJECT(DisplayCoordinateAxes)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
if (APPLE)
  add_executable(DisplayCoordinateAxes MACOSX_BUNDLE DisplayCoordinateAxes.cxx)
else()
  add_executable(DisplayCoordinateAxes DisplayCoordinateAxes.cxx)
endif()
 
if(VTK_LIBRARIES)
  target_link_libraries(DisplayCoordinateAxes ${VTK_LIBRARIES})
else()
  target_link_libraries(DisplayCoordinateAxes vtkHybrid vtkWidgets )
endif()
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