Move Redraw() function from NGSolve to Netgen

- used in Snapshot

libsrc/visualization/vsmesh.cpp

@@ -3536,6 +3536,7 @@ namespace netgen
 
 #ifdef NG_PYTHON
 #include <../general/ngpython.hpp>
+#include "../include/nginterface.h"
 
 DLL_HEADER void ExportMeshVis(py::module &m)
 {
@@ -3577,6 +3578,32 @@ DLL_HEADER 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 (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)
 // {

python/__init__.py

@@ -11,3 +11,14 @@ del sys
 del os
 
 from . import libngpy
+
+def Redraw(*args, **kwargs):
+    if libngpy.meshvis._Redraw(*args, **kwargs):
+        try:
+            import netgen
+            import tkinter
+            cnt = 0
+            while(netgen.gui.win.tk.dooneevent(tkinter._tkinter.DONT_WAIT) and cnt < 100):
+                cnt += 1
+        except:
+            pass

python/gui.py

@@ -26,8 +26,7 @@ if not netgen.libngpy._meshing._netgen_executable_started:
         pass
 
 def Snapshot(w,h, filename=None):
-    import ngsolve
-    ngsolve.Redraw(blocking=True)
+    netgen.Redraw(blocking=True)
     import numpy
     image = netgen.libngpy.Snapshot(w, h)
     image = numpy.array(image, dtype=numpy.uint8).reshape(h, w, 3)