Don't load gui libraries when importing netgen

libsrc/meshing/python_mesh.cpp

@@ -1538,6 +1538,32 @@ project_boundaries : Optional[str] = None
       .def(py::init<>())
       ;
     m.def("SetParallelPickling", [](bool par) { parallel_pickling = par; });
+    m.def ("_Redraw",
+        ([](bool blocking, double fr)
+          {
+            static auto last_time = std::chrono::system_clock::now()-std::chrono::seconds(10);
+            auto now = std::chrono::system_clock::now();
+            double elapsed = std::chrono::duration<double>(now-last_time).count();
+            if (blocking || elapsed * fr > 1)
+              {
+                Ng_Redraw(blocking);
+                last_time = std::chrono::system_clock::now();
+                return true;
+              }
+            return false;
+          }),
+        py::arg("blocking")=false, py::arg("fr") = 25, R"raw_string(
+  Redraw all
+
+  Parameters:
+
+  blocking : bool
+    input blocking
+
+  fr : double
+    input framerate
+
+  )raw_string");
 }
 
 PYBIND11_MODULE(libmesh, m) {

libsrc/visualization/vsmesh.cpp

@@ -3580,32 +3580,6 @@ NGGUI_API void ExportMeshVis(py::module &m)
       ([] () {
        return vsmesh.GetMesh();
        }));
-  m.def ("_Redraw",
-      ([](bool blocking, double fr)
-        {
-          static auto last_time = std::chrono::system_clock::now()-std::chrono::seconds(10);
-          auto now = std::chrono::system_clock::now();
-          double elapsed = std::chrono::duration<double>(now-last_time).count();
-          if (blocking || elapsed * fr > 1)
-            {
-              Ng_Redraw(blocking);
-              last_time = std::chrono::system_clock::now();
-              return true;
-            }
-          return false;
-        }),
-      py::arg("blocking")=false, py::arg("fr") = 25, R"raw_string(
-Redraw all
-
-Parameters:
-
-blocking : bool
-  input blocking
-
-fr : double
-  input framerate
-
-)raw_string");
 }
 // BOOST_PYTHON_MODULE(libvisual)
 // {

ng/netgenpy.cpp

@@ -5,12 +5,9 @@
 #include <core/ngcore_api.hpp>
 
 void NGCORE_API_IMPORT ExportNetgenMeshing(py::module &m);
-void NGCORE_API_IMPORT ExportMeshVis(py::module &m);
 void NGCORE_API_IMPORT ExportCSG(py::module &m);
-void NGCORE_API_IMPORT ExportCSGVis(py::module &m);
 void NGCORE_API_IMPORT ExportGeom2d(py::module &m);
 void NGCORE_API_IMPORT ExportSTL(py::module &m);
-void NGCORE_API_IMPORT ExportSTLVis(py::module &m);
 #ifdef OCCGEOMETRY
 void NGCORE_API_IMPORT ExportNgOCC(py::module &m);
 #endif // OCCGEOMETRY

python/__init__.py

@@ -16,23 +16,7 @@ del os
 
 from . import libngpy
 
-if config.USE_GUI:
+from netgen.libngpy._meshing import _Redraw
-    from . import libngguipy
-    global _Redraw, Redraw
-    _Redraw = libngguipy.meshvis._Redraw
 
-    def RedrawWithEventHandling(*args, **kwargs):
-        try:
-            if libngguipy.meshvis._Redraw(*args, **kwargs):
-                import netgen
-                import tkinter
-                cnt = 0
-                while(netgen.gui.win.tk.dooneevent(tkinter._tkinter.DONT_WAIT) and cnt < 100):
-                    cnt += 1
-        except:
-            pass
-
-    Redraw = RedrawWithEventHandling
-else:
 def Redraw(*args, **kwargs):
-        pass
+    return _Redraw(*args, **kwargs)

python/gui.py

@@ -1,5 +1,8 @@
 import netgen
 
+from . import libngguipy
+from . import libngpy
+
 def StartGUI():
     from tkinter import Tk
     from netgen import config
@@ -18,7 +21,7 @@ def StartGUI():
     win.tk.eval('lappend ::auto_path ' + netgen._netgen_lib_dir)
     win.tk.eval('lappend ::auto_path ' + netgen._netgen_bin_dir)
     # load with absolute path to avoid issues on MacOS
-    win.tk.eval('load "'+netgen._netgen_lib_dir.replace('\\','/')+'/libgui[info sharedlibextension]" gui')
+    win.tk.eval('load "'+netgen._netgen_lib_dir.replace('\\','/')+'/libnggui[info sharedlibextension]" gui')
 
     if config.is_python_package and 'darwin' in sys.platform:
         # libngsolve and other libraries are installed into netgen python dir to keep relative installation paths, but tcl won't find them there automatically
@@ -27,6 +30,17 @@ def StartGUI():
 
     win.tk.eval( netgen.libngpy._meshing._ngscript)
 
+    def _Redraw(*args, **kwargs):
+        if libngpy._meshing._Redraw(*args, **kwargs):
+            import netgen
+            import tkinter
+            cnt = 0
+            while(win.tk.dooneevent(tkinter._tkinter.DONT_WAIT) and cnt < 100):
+                cnt += 1
+
+    netgen._Redraw = _Redraw
+    _Redraw(blocking=True)
+
     
 if not netgen.libngpy._meshing._netgen_executable_started:
     import os