simplify modules/viz/CMakeLists.txt

modules/viz/CMakeLists.txt

-set(BUILD_opencv_viz_INIT OFF)
-
-
-###############################################################################
-# Find qvtk
-# This sets the following variables:
-# QVTK_FOUND - True if QVTK was found.
-# QVTK_INCLUDE_DIR - Directory containing the QVTK include files.
-# QVTK_LIBRARY - QVTK library.
-# if QVTK_FOUND then QVTK_INCLUDE_DIR is appended to VTK_INCLUDE_DIRS and QVTK_LIBRARY is appended to QVTK_LIBRARY_DIR
 macro(find_qvtk)
   find_library (QVTK_LIBRARY QVTK HINTS ${VTK_DIR} ${VTK_DIR}/bin)
   find_path (QVTK_INCLUDE_DIR QVTKWidget.h HINT ${VTK_INCLUDE_DIRS})
   find_package_handle_standard_args(QVTK DEFAULT_MSG QVTK_LIBRARY QVTK_INCLUDE_DIR)
 
-  if(NOT QVTK_FOUND)
-    set (VTK_USE_QVTK OFF)
-  else(NOT QVTK_FOUND)
+  if(QVTK_FOUND)   
     get_filename_component (QVTK_LIBRARY_DIR ${QVTK_LIBRARY} PATH)
-    set (VTK_LIBRARY_DIRS ${VTK_LIBRARY_DIRS} ${QVTK_LIBRARY_DIR})
-    set (VTK_INCLUDE_DIRS ${VTK_INCLUDE_DIRS} ${QVTK_INCLUDE_DIR})
+    list(APPEND VTK_LIBRARY_DIRS ${QVTK_LIBRARY_DIR})
+    list(APPEND VTK_INCLUDE_DIRS ${QVTK_INCLUDE_DIR})
     set (VTK_USE_QVTK ON)
   endif()
 endmacro()
@@ -34,52 +22,31 @@ macro(find_vtk)
       set(HAVE_VTK ON)    
     else ()
       set(HAVE_VTK OFF)
-      message ("Warning: VTK disabled. You are to build OpenCV in STATIC but VTK is SHARED!")
+      message (WARNING "VTK disabled. You are to build OpenCV in STATIC but VTK is SHARED!")
     endif ()
   endif()
 endmacro()
 
-
-
-
-#find_package(OpenGL)
-#if (OPENGL_FOUND)
-#  if(OPENGL_INCLUDE_DIR)
-#    include_directories("${OPENGL_INCLUDE_DIR}")
-#  endif()
-#  if(OPENGL_DEFINITIONS)
-#    add_definitions("${OPENGL_DEFINITIONS}")
-#  endif()
-#endif()
-
-
 find_vtk()
 
-
-if(NOT HAVE_VTK)
-  set(DEFAULT FALSE)
-  set(REASON "VTK was not found.")
-else()
-  set(DEFAULT TRUE)
-  set(REASON)
+if(HAVE_VTK)
   set(VTK_USE_FILE ${VTK_USE_FILE} CACHE INTERNAL "VTK_USE_FILE")
   include (${VTK_USE_FILE})
-  include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
+  add_definitions(-DHAVE_VTK)
+else()
+  return()
 endif()
 
 
-add_definitions(-DHAVE_VTK)
-
-
 set(the_description "Viz")
 set(BUILD_opencv_viz_INIT OFF)
 include_directories(src)
 ocv_define_module(viz opencv_core)
 
-target_link_libraries(opencv_viz vtkCommon vtkWidgets vtkFiltering vtkRendering)
-#${OPENGL_LIBRARIES})
-
-if(APPLE)
-    target_link_libraries(opencv_viz "-framework Cocoa")
+if(BUILD_opencv_viz)
+  target_link_libraries(opencv_viz vtkCommon vtkWidgets vtkFiltering vtkRendering)
+  if(APPLE)
+      target_link_libraries(opencv_viz "-framework Cocoa")
+  endif()
 endif()