Update CMakeLists.txt to allow drawing of lcc example

Installation/cmake/modules/FindCGALBasicViewer.cmake

@@ -1,29 +0,0 @@
-# This file must be included in your CMakeLists.txt to use the basic viewer
-# You need to link the libraries in your executable by using
-# TARGET_LINK_LIBRARIES( myexec ${BASIC_VIEWER_LIBRARIES})
-
-if ( NOT CGAL_FOUND OR NOT CGAL_Qt5_FOUND)
-  message(STATUS "NOTICE: Libraries for basic viewer not found "
-                 "(CGAL, Qt5, QGLViewer).")
-endif( NOT CGAL_FOUND OR NOT CGAL_Qt5_FOUND)
-
-include( ${CGAL_USE_FILE} )
-set(CMAKE_INCLUDE_CURRENT_DIR ON)
-
-FIND_PACKAGE(Qt5        REQUIRED COMPONENTS OpenGL Xml)
-find_package(QGLViewer  REQUIRED)
-find_package(OpenGL     REQUIRED)
-
-add_definitions(${QT_DEFINITIONS})
-add_definitions(-DQT_NO_KEYWORDS)
-
-set (BASIC_VIEWER_LIBRARIES ${QT_LIBRARIES} )
-
-set(BASIC_VIEWER_MODULES Xml OpenGL)
-
-ADD_DEFINITIONS("-DCGAL_USE_BASIC_VIEWER")
-message(STATUS "Libraries for lcc_viewer found. You need to link them "
-               "in your executable by using "
-               "TARGET_LINK_LIBRARIES( myexec \${BASIC_VIEWER_LIBRARIES})")
-
-set(USE_BASIC_VIEWER true)

Linear_cell_complex/examples/Linear_cell_complex/CMakeLists.txt

@@ -9,13 +9,8 @@ if(NOT POLICY CMP0070 AND POLICY CMP0053)
   cmake_policy(SET CMP0053 OLD)
 endif()
 
-# If you want to visualize a linear cell complex, you can use the following viewer
-# based on qt. Just uncomment the following line, plus the line find_package(CGALBasicViewer) below
 find_package(CGAL COMPONENTS Qt5)
 
-# If you don't want to visualize, use the following line (otherwise comment it)
-# find_package(CGAL QUIET)
-
 # For Gprof.
 # ADD_DEFINITIONS("-pg")
 # set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pg")
@@ -25,7 +20,6 @@ find_package(CGAL COMPONENTS Qt5)
 
 if ( CGAL_FOUND )
   include(${CGAL_USE_FILE})
-  find_package(CGALBasicViewer)
 
   include( CGAL_CreateSingleSourceCGALProgram )
   include_directories(BEFORE ../../include)
@@ -42,10 +36,22 @@ if ( CGAL_FOUND )
   create_single_source_cgal_program("linear_cell_complex_3_operations.cpp")  
 
   create_single_source_cgal_program("display_linear_cell_complex.cpp")                           
-if (USE_BASIC_VIEWER)
+  if(CGAL_Qt5_FOUND)
-  target_link_libraries(display_linear_cell_complex ${BASIC_VIEWER_LIBRARIES})
+    find_package(Qt5        REQUIRED COMPONENTS OpenGL Xml)
-  qt5_use_modules(display_linear_cell_complex ${BASIC_VIEWER_MODULES})
+    find_package(QGLViewer  REQUIRED)
-endif(USE_BASIC_VIEWER)
+    find_package(OpenGL     REQUIRED)
+    add_definitions(${QT_DEFINITIONS})
+    add_definitions(-DQT_NO_KEYWORDS)
+    include_directories( ${QGLVIEWER_INCLUDE_DIR} )
+    add_definitions(${QGLVIEWER_DEFINITIONS})
+
+    target_link_libraries(display_linear_cell_complex CGAL::CGAL_Qt5
+                                                      ${QT_LIBRARIES}
+                                                      ${QGLVIEWER_LIBRARIES}
+                                                      ${OPENGL_gl_LIBRARY})
+    target_compile_definitions(display_linear_cell_complex PRIVATE CGAL_USE_BASIC_VIEWER)
+  endif()
+
 else()
 
   message(STATUS "This program requires the CGAL library, "

Linear_cell_complex/include/CGAL/Linear_cell_complex_viewer_qt.h

@@ -210,6 +210,12 @@ void draw(const LCC& alcc,
   app.exec();
 }
 
+template<class LCC>
+void draw(const LCC& alcc,
+          const char* title="LCC Viewer",
+          bool nofill=false)
+{ return draw<LCC, DefaultColorFunctorLCC>(alcc, title, nofill); }
+
 } // End namespace CGAL
 
 #else // CGAL_USE_BASIC_VIEWER
@@ -219,9 +225,18 @@ namespace CGAL
   
 template<class LCC, class ColorFunctor>
 void draw(const LCC&,
-          const char*="LCC Viewer",
+          const char* ="LCC Viewer",
           bool=false,
-          const ColorFunctor&=ColorFunctor())
+          const ColorFunctor& =ColorFunctor())
+{
+  std::cerr<<"Impossible to draw a Linear_cell_complex because CGAL_USE_BASIC_VIEWER is not defined."
+           <<std::endl;
+}
+
+template<class LCC>
+void draw(const LCC&,
+          const char* ="LCC Viewer",
+          bool=false)
 {
   std::cerr<<"Impossible to draw a Linear_cell_complex because CGAL_USE_BASIC_VIEWER is not defined."
            <<std::endl;
@@ -231,15 +246,4 @@ void draw(const LCC&,
 
 #endif // CGAL_USE_BASIC_VIEWER
 
-namespace CGAL 
-{
-
-template<class LCC>
-void draw(const LCC& alcc,
-          const char* title="LCC Viewer",
-          bool nofill=false)
-{ return draw<LCC, DefaultColorFunctorLCC>(alcc, title, nofill); }
-
-} // End namespace CGAL
-
 #endif // CGAL_LCC_VIEWER_QT_H