0031668: Visualization - WebGL sample doesn't work on Emscripten 1.39

[occt.git] / src / Draw / Draw.cxx

// Created on: 1993-08-13
// Created by: Bruno DUMORTIER
// Copyright (c) 1993-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.


#include <Draw.hxx>
#include <Draw_Appli.hxx>
#include <Draw_Drawable3D.hxx>
#include <Draw_Failure.hxx>
#include <Draw_Interpretor.hxx>
#include <Draw_ProgressIndicator.hxx>
#include <Draw_Window.hxx>
#include <gp_Pnt2d.hxx>
#include <Message.hxx>
#include <Message_Messenger.hxx>
#include <Message_PrinterOStream.hxx>
#include <OSD.hxx>
#include <OSD_Environment.hxx>
#include <OSD_File.hxx>
#include <OSD_Process.hxx>
#include <OSD_SharedLibrary.hxx>
#include <OSD_Timer.hxx>
#include <Plugin_MapOfFunctions.hxx>
#include <Resource_Manager.hxx>
#include <Standard_ErrorHandler.hxx>
#include <Standard_Stream.hxx>
#include <Standard_Version.hxx>
#include <TCollection_AsciiString.hxx>

#include <tcl.h>

#include <Standard_WarningDisableFunctionCast.hxx>

// on MSVC, use #pragma to define name of the Tcl library to link with,
// depending on Tcl version number
#ifdef _MSC_VER
// two helper macros are needed to convert version number macro to string literal
#define STRINGIZE1(a) #a
#define STRINGIZE2(a) STRINGIZE1(a)
#pragma comment (lib, "tcl" STRINGIZE2(TCL_MAJOR_VERSION) STRINGIZE2(TCL_MINOR_VERSION) ".lib")
#pragma comment (lib, "tk"  STRINGIZE2(TCL_MAJOR_VERSION) STRINGIZE2(TCL_MINOR_VERSION) ".lib")
#undef STRINGIZE2
#undef STRINGIZE1
#endif

extern Standard_Boolean Draw_ParseFailed;

Standard_EXPORT Draw_Viewer dout;
Standard_EXPORT Draw_Interpretor theCommands;
Standard_EXPORT Standard_Boolean Draw_Batch;
Standard_EXPORT Standard_Boolean Draw_Spying = Standard_False;
Standard_EXPORT Standard_Boolean Draw_Chrono = Standard_False;
Standard_EXPORT Standard_Boolean Draw_VirtualWindows = Standard_False;
Standard_EXPORT Standard_Boolean ErrorMessages = Standard_True;

static const char* ColorNames[MAXCOLOR] = {
  "White","Red","Green","Blue","Cyan","Gold","Magenta",
  "Maroon","Orange","Pink","Salmon","Violet","Yellow","Khaki","Coral"
  };

std::filebuf Draw_Spyfile;

static std::ostream spystream(&Draw_Spyfile);

static Handle(Draw_ProgressIndicator) PInd = NULL;

Standard_EXPORT Standard_Boolean Draw_Interprete(const char* command);
// true if complete command

// *******************************************************************
// read an init file
// *******************************************************************

static void interpreteTclCommand (const TCollection_AsciiString& theCmd)
{
#ifdef _WIN32
  if (!Draw_Batch)
  {
    try
    {
      while (console_semaphore == HAS_CONSOLE_COMMAND)
      {
        Sleep(10);
      }
      {
        TCollection_ExtendedString aCmdWide (theCmd);
        wcscpy_s (console_command, aCmdWide.ToWideString());
      }
      console_semaphore = HAS_CONSOLE_COMMAND;
      while (console_semaphore == HAS_CONSOLE_COMMAND)
      {
        Sleep(10);
      }
    }
    catch (...)
    {
      std::cout << "Error while reading a script file.\n";
      ExitProcess(0);
    }
  }
  else
#endif
  {
    Draw_Interprete (theCmd.ToCString());
  }
}

static void ReadInitFile (const TCollection_AsciiString& theFileName)
{
  TCollection_AsciiString aCmd = theFileName;
#ifdef _WIN32
  aCmd.ChangeAll ('\\', '/');
#endif
  aCmd = TCollection_AsciiString ("source -encoding utf-8 \"") + aCmd + "\"";
  interpreteTclCommand (aCmd);
}

//! Define environment variable available from Tcl and OCCT.
static void setOcctTclEnv (const TCollection_AsciiString& theName,
                           TCollection_AsciiString& thePath)
{
  if (thePath.IsEmpty())
  {
    return;
  }

  thePath.ChangeAll ('\\', '/');
  OSD_Environment aRedPathEnv (theName);
  aRedPathEnv.SetValue (thePath);
  aRedPathEnv.Build();

  const TCollection_AsciiString aPutEnv = theName + "=" + thePath;
  Tcl_PutEnv (aPutEnv.ToCString());
}

//! Look for resource within standard installation layouts relative to executable location.
//!
//! Bin (INSTALL_DIR_BIN):
//!  - Windows: <prefix>/win64/vc10/bin(d)
//!  - Unix:    <prefix>/bin
//! Resources (INSTALL_DIR_RESOURCE):
//!  - Windows: <prefix>/src
//!  - Unix:    <prefix>/share/opencascade-7.0.0/resources
//! Samples (INSTALL_DIR_SAMPLES):
//!  - Windows: <prefix>/samples
//!  - Unix:    <prefix>/share/opencascade-7.0.0/samples
//! Tests (INSTALL_DIR_TESTS):
//!  - Windows: <prefix>/tests
//!  - Unix:    <prefix>/share/opencascade-7.0.0/tests
//!
//! @param theCasRoot  [out] found CASROOT location (e.g. installation folder)
//! @param theResRoot  [out] found resources root location
//! @param theResName   [in] resource to find ("resources", "samples", etc.)
//! @param theProbeFile [in] file to probe within resources location (e.g. "DrawResources/DrawDefault" within "resources")
static bool searchResources (TCollection_AsciiString& theCasRoot,
                             TCollection_AsciiString& theResRoot,
                             const TCollection_AsciiString& theResName,
                             const TCollection_AsciiString& theProbeFile)
{
  const TCollection_AsciiString aResLayouts[] =
  {
    TCollection_AsciiString("/share/opencascade-" OCC_VERSION_STRING_EXT "/") + theResName,
    TCollection_AsciiString("/share/opencascade-" OCC_VERSION_COMPLETE "/") + theResName,
    TCollection_AsciiString("/share/opencascade-" OCC_VERSION_STRING "/") + theResName,
    TCollection_AsciiString("/share/opencascade/") + theResName,
    TCollection_AsciiString("/share/occt-" OCC_VERSION_STRING_EXT "/") + theResName,
    TCollection_AsciiString("/share/occt-" OCC_VERSION_COMPLETE "/") + theResName,
    TCollection_AsciiString("/share/occt-" OCC_VERSION_STRING "/") + theResName,
    TCollection_AsciiString("/share/occt/") + theResName,
    TCollection_AsciiString("/") + theResName,
    TCollection_AsciiString("/share/opencascade"),
    TCollection_AsciiString("/share/occt"),
    TCollection_AsciiString("/share"),
    TCollection_AsciiString("/src"),
    TCollection_AsciiString("")
  };

  const TCollection_AsciiString anExeDir (OSD_Process::ExecutableFolder());
  for (Standard_Integer aLayIter = 0;; ++aLayIter)
  {
    const TCollection_AsciiString& aResLayout = aResLayouts[aLayIter];
    const TCollection_AsciiString  aProbeFile = aResLayout + "/" + theProbeFile;
    if (OSD_File (anExeDir + aProbeFile).Exists())
    {
      theCasRoot = anExeDir;
      theResRoot = theCasRoot + aResLayout;
      return true;
    }
    // <prefix>/bin(d)
    else if (OSD_File (anExeDir + "../" + aProbeFile).Exists())
    {
      theCasRoot = anExeDir + "..";
      theResRoot = theCasRoot + aResLayout;
      return true;
    }
    // <prefix>/gcc/bin(d)
    else if (OSD_File (anExeDir + "../../" + aProbeFile).Exists())
    {
      theCasRoot = anExeDir + "../..";
      theResRoot = theCasRoot + aResLayout;
      return true;
    }
    // <prefix>/win64/vc10/bin(d)
    else if (OSD_File (anExeDir + "../../../" + aProbeFile).Exists())
    {
      theCasRoot = anExeDir + "../../..";
      theResRoot = theCasRoot + aResLayout;
      return true;
    }

    if (aResLayout.IsEmpty())
    {
      return false;
    }
  }
}

//=======================================================================
//function : GetInterpretor
//purpose  :
//=======================================================================
Draw_Interpretor& Draw::GetInterpretor()
{
  return theCommands;
}

//=======================================================================
//function :
//purpose  : Set/Get Progress Indicator
//=======================================================================
void Draw::SetProgressBar(const Handle(Draw_ProgressIndicator)& thePI)
{
  PInd = thePI;
}

Handle(Draw_ProgressIndicator) Draw::GetProgressBar()
{
  return PInd;
}

#ifndef _WIN32
/*--------------------------------------------------------*\
|  exitProc: finalization handler for Tcl/Tk thread. Forces parent process to die
\*--------------------------------------------------------*/
void exitProc(ClientData /*dc*/)
{
  if (!Draw_Batch) {
    for (Standard_Integer id = 0; id < MAXVIEW; id++)
      dout.DeleteView(id);
  }
}
#endif

// *******************************************************************
// main
// *******************************************************************
#ifdef _WIN32
Standard_EXPORT void Draw_Appli(HINSTANCE hInst, HINSTANCE hPrevInst, int nShow, int argc, wchar_t** argv, const FDraw_InitAppli Draw_InitAppli)
#else
void Draw_Appli(int argc, char** argv, const FDraw_InitAppli Draw_InitAppli)
#endif
{

// prepend extra DLL search path to override system libraries like opengl32.dll
#ifdef _WIN32
  OSD_Environment aUserDllEnv ("CSF_UserDllPath");
  const TCollection_ExtendedString aUserDllPath (aUserDllEnv.Value());
  if (!aUserDllPath.IsEmpty())
  {
    // This function available since Win XP SP1 #if (_WIN32_WINNT >= 0x0502).
    // We retrieve dynamically here (kernel32 should be always preloaded).
    typedef BOOL (WINAPI *SetDllDirectoryW_t)(const wchar_t* thePathName);
    HMODULE aKern32Module = GetModuleHandleW (L"kernel32");
    SetDllDirectoryW_t aFunc = (aKern32Module != NULL)
                             ? (SetDllDirectoryW_t )GetProcAddress (aKern32Module, "SetDllDirectoryW") : NULL;
    if (aFunc != NULL)
    {
      aFunc (aUserDllPath.ToWideString());
    }
    else
    {
      //std::cerr << "SetDllDirectoryW() is not available on this system!\n";
    }
    if (aKern32Module != NULL)
    {
      FreeLibrary (aKern32Module);
    }
  }
#endif

  // *****************************************************************
  // analyze arguments
  // *****************************************************************
  Draw_Batch = Standard_False;
  TCollection_AsciiString aRunFile, aCommand;
  Standard_Boolean isInteractiveForced = Standard_False;

  // parse command line
  for (int anArgIter = 1; anArgIter < argc; ++anArgIter)
  {
    TCollection_AsciiString anArg (argv[anArgIter]);
    anArg.LowerCase();
    if (anArg == "-h"
     || anArg == "--help")
    {
      std::cout << "Open CASCADE " << OCC_VERSION_STRING_EXT << " DRAW Test Harness\n\n";
      std::cout << "Options:\n";
      std::cout << "  -b: batch mode (no GUI, no viewers)\n";
      std::cout << "  -v: no GUI, use virtual (off-screen) windows for viewers\n";
      std::cout << "  -i: interactive mode\n";
      std::cout << "  -f file: execute script from file\n";
      std::cout << "  -c command args...: execute command (with optional arguments)\n\n";
      std::cout << "Options -b, -v, and -i are mutually exclusive.\n";
      std::cout << "If -c or -f are given, -v is default; otherwise default is -i.\n";
      std::cout << "Options -c and -f are alternatives and should be at the end \n";
      std::cout << "of the command line.\n";
      std::cout << "Option -c can accept set of commands separated by ';'.\n";
      return;
    }
    else if (anArg == "-b")
    {
      Draw_Batch = Standard_True;
    }
    else if (anArg == "-v")
    {
      // force virtual windows
      Draw_VirtualWindows = Standard_True;
    }
    else if (anArg == "-i")
    {
      // force interactive
      Draw_VirtualWindows = Standard_False;
      isInteractiveForced = Standard_True;
    }
    else if (anArg == "-f") // -f option should be LAST!
    {
      Draw_VirtualWindows = !isInteractiveForced;
      if (++anArgIter < argc)
      {
        aRunFile = TCollection_AsciiString (argv[anArgIter]);
      }
      break;
    }
    else if (anArg == "-c") // -c option should be LAST!
    {
      Draw_VirtualWindows = !isInteractiveForced;
      if (++anArgIter < argc)
      {
        aCommand = TCollection_AsciiString (argv[anArgIter]);
      }
      while (++anArgIter < argc)
      {
        aCommand.AssignCat (" ");
        aCommand.AssignCat (argv[anArgIter]);
      }
      break;
    }
    else
    {
      std::cout << "Error: unsupported option " << TCollection_AsciiString (argv[anArgIter]) << "\n";
    }
  }

  // *****************************************************************
  // set signals
  // *****************************************************************
  OSD::SetSignal(Standard_False);

#ifdef _WIN32
  // in interactive mode, force Windows to report dll loading problems interactively
  if ( ! Draw_VirtualWindows && ! Draw_Batch )
    ::SetErrorMode (0);
#endif

  // *****************************************************************
  // init X window and create display
  // *****************************************************************
#ifdef _WIN32
  HWND hWnd = NULL;
#endif

  if (!Draw_Batch)
#ifdef _WIN32
    Draw_Batch=!Init_Appli(hInst, hPrevInst, nShow, hWnd);
#else
    Draw_Batch=!Init_Appli();
#endif
  else
  {
    std::cout << "DRAW is running in batch mode" << std::endl;
    theCommands.Init();
    Tcl_Init(theCommands.Interp());
  }

  if (! Draw_Batch)
  {
    // Default colors
    for (int i = 0; i < MAXCOLOR; ++i)
    {
      if (!dout.DefineColor (i, ColorNames[i]))
      {
        std::cout <<"Could not allocate default color " << ColorNames[i] << std::endl;
      }
    }
  }

  // *****************************************************************
  // set maximum precision for cout
  // *****************************************************************
  std::cout.precision(15);

  // *****************************************************************
  // standard commands
  // *****************************************************************
  Draw::BasicCommands(theCommands);
  Draw::VariableCommands(theCommands);
  Draw::UnitCommands(theCommands);
  if (!Draw_Batch) Draw::GraphicCommands(theCommands);

  // *****************************************************************
  // user commands
  // *****************************************************************
  Draw_InitAppli(theCommands);

#ifndef _WIN32
  Tcl_CreateExitHandler(exitProc, 0);
#endif

  // *****************************************************************
  // read init files
  // *****************************************************************
  // default
  const TCollection_AsciiString aDrawDef (OSD_Environment ("DRAWDEFAULT").Value());
  if (!aDrawDef.IsEmpty())
  {
    ReadInitFile (aDrawDef);
  }
  else
  {
    TCollection_AsciiString aDrawHome;
    TCollection_AsciiString aCasRoot (OSD_Environment ("CASROOT").Value());
    if (!aCasRoot.IsEmpty())
    {
      aDrawHome = aCasRoot + "/src/DrawResources";
    }
    else
    {
      // search for relative locations within standard development environment
      TCollection_AsciiString aResPath;
      if (searchResources (aCasRoot, aResPath, "resources", "DrawResources/DrawDefault"))
      {
        aDrawHome = aResPath + "/DrawResources";
        setOcctTclEnv ("CASROOT",  aCasRoot);
        setOcctTclEnv ("DRAWHOME", aDrawHome);
        setOcctTclEnv ("CSF_OCCTResourcePath", aResPath);
      }

      TCollection_AsciiString aSamplesPath;
      if (OSD_Environment ("CSF_OCCTSamplesPath").Value().IsEmpty()
       && searchResources (aCasRoot, aSamplesPath, "samples", "tcl/Readme.txt"))
      {
        setOcctTclEnv ("CSF_OCCTSamplesPath", aSamplesPath);
      }

      TCollection_AsciiString aTestsPath;
      if (OSD_Environment ("CSF_TestScriptsPath").Value().IsEmpty()
       && searchResources (aCasRoot, aTestsPath, "tests", "parse.rules"))
      {
        setOcctTclEnv ("CSF_TestScriptsPath", aTestsPath);
      }
    }

    if (!aDrawHome.IsEmpty())
    {
      const TCollection_AsciiString aDefStr = aDrawHome + "/DrawDefault";
      ReadInitFile (aDefStr);
    }
    else
    {
#ifdef _WIN32
      ReadInitFile ("ddefault");
#else
      std::cout << " the CASROOT variable is mandatory to Run OpenCascade "<< std::endl;
      std::cout << "No default file" << std::endl;
#endif
    }
  }

  // read commands from file
  if (!aRunFile.IsEmpty())
  {
    if (!isInteractiveForced)
    {
      // disable console messages colorization to avoid spoiling log with color codes
      for (Message_SequenceOfPrinters::Iterator aPrinterIter (Message::DefaultMessenger()->Printers());
           aPrinterIter.More(); aPrinterIter.Next())
      {
        if (Handle(Message_PrinterOStream) aPrinter = Handle(Message_PrinterOStream)::DownCast (aPrinterIter.Value()))
        {
          aPrinter->SetToColorize (Standard_False);
        }
      }
    }
    ReadInitFile (aRunFile);
    // provide a clean exit, this is useful for some analysis tools
    if ( ! isInteractiveForced )
#ifndef _WIN32
      return;
#else
      ExitProcess(0);
#endif
  }

  // execute command from command line
  if (!aCommand.IsEmpty())
  {
#ifdef _WIN32
    if (!Draw_Batch)
    {
      // on Windows except batch mode, commands are executed in separate thread
      while (console_semaphore == HAS_CONSOLE_COMMAND) Sleep(10);
      TCollection_ExtendedString aCmdWide(aCommand);
      wcscpy_s(console_command, aCmdWide.ToWideString());
      console_semaphore = HAS_CONSOLE_COMMAND;
      while (console_semaphore == HAS_CONSOLE_COMMAND) Sleep(10);
    }
    else
#endif
    Draw_Interprete (aCommand.ToCString()); // Linux and Windows batch mode
    // provide a clean exit, this is useful for some analysis tools
    if ( ! isInteractiveForced )
#ifndef _WIN32
      return;
#else
      ExitProcess(0);
#endif
  }

  // *****************************************************************
  // X loop
  // *****************************************************************
  if (! Draw_Batch) {
#ifdef _WIN32
    Run_Appli(hWnd);
#else
    Run_Appli(Draw_Interprete);
#endif
  }
  else
  {
    const int MAXCMD = 2048;
    char cmd[MAXCMD];
    for (int ncmd = 1;; ++ncmd)
    {
      std::cout << "Draw[" << ncmd << "]> ";
      if (std::cin.getline (cmd, MAXCMD).fail())
      {
        break;
      }
      Draw_Interprete(cmd);
    }
  }
#ifdef _WIN32
  // Destruction de l'application
  Destroy_Appli(hInst);
#endif
}
//#endif

// User functions called before and after each command
void (*Draw_BeforeCommand)() = NULL;
void (*Draw_AfterCommand)(Standard_Integer) = NULL;

Standard_Boolean Draw_Interprete(const char* com)
{

  static Standard_Boolean first = Standard_True;
  static Tcl_DString command;

  if (first) {
    first = Standard_False;
    Tcl_DStringInit(&command);
  }

#ifdef _WIN32
  // string is already converted into UTF-8
  Tcl_DStringAppend(&command, com, -1);
#elif ((TCL_MAJOR_VERSION > 8) || ((TCL_MAJOR_VERSION == 8) && (TCL_MINOR_VERSION >= 1)))
  // OCC63: Since Tcl 8.1 it uses UTF-8 encoding for internal representation of strings
  Tcl_ExternalToUtfDString ( NULL, com, -1, &command );
#else
  Tcl_DStringAppend(&command,com,-1);
#endif

  if (!theCommands.Complete(Tcl_DStringValue(&command)))
    return Standard_False;

  // *******************************************************************
  // Command interpreter
  // *******************************************************************

//  Standard_Integer i = 0;
//  Standard_Integer j = 0;

  Standard_Boolean wasspying = Draw_Spying;

  OSD_Timer tictac;
  Standard_Boolean hadchrono = Draw_Chrono;
  if (hadchrono) tictac.Start();

  if (Draw_BeforeCommand) (*Draw_BeforeCommand) ();

  Standard_Integer c;

  c = theCommands.RecordAndEval(Tcl_DStringValue(&command));

  if (Draw_AfterCommand) (*Draw_AfterCommand)(c);

  if (wasspying && Draw_Spying) {
    if (c > 0) spystream << "# ";
    spystream << Tcl_DStringValue(&command) << "\n";
  }

  dout.Flush();

  if (*theCommands.Result())
  {
    std::cout << theCommands.Result() << std::endl;
  }

  if (Draw_Chrono && hadchrono) {
    tictac.Stop();
    tictac.Show();
  }

  Tcl_DStringFree(&command);

  return Standard_True;
}

//
// for TCl
//

Standard_Integer Tcl_AppInit (Tcl_Interp *)
{
  return 0;
}

//
// for debug call
//



Standard_Integer  Draw_Call (char *c)
{
   Standard_Integer r = theCommands.Eval(c);
   std::cout << theCommands.Result() << std::endl;
   return r;
}

//=================================================================================
//
//=================================================================================
void Draw::Load(Draw_Interpretor& theDI, const TCollection_AsciiString& theKey,
		const TCollection_AsciiString& theResourceFileName,
		TCollection_AsciiString& theDefaultsDirectory,
		TCollection_AsciiString& theUserDefaultsDirectory,
		const Standard_Boolean Verbose ) {

  static Plugin_MapOfFunctions theMapOfFunctions;
  OSD_Function f;

  if(!theMapOfFunctions.IsBound(theKey)) {

    Handle(Resource_Manager) aPluginResource = new Resource_Manager(theResourceFileName.ToCString(), theDefaultsDirectory, theUserDefaultsDirectory, Verbose);

    if(!aPluginResource->Find(theKey.ToCString())) {
      Standard_SStream aMsg; aMsg << "Could not find the resource:";
      aMsg << theKey.ToCString()<< std::endl;
      std::cout << "could not find the resource:"<<theKey.ToCString()<< std::endl;
      throw Draw_Failure(aMsg.str().c_str());
    }

    TCollection_AsciiString aPluginLibrary("");
#if !defined(_WIN32) || defined(__MINGW32__)
    aPluginLibrary += "lib";
#endif
    aPluginLibrary +=  aPluginResource->Value(theKey.ToCString());
#ifdef _WIN32
    aPluginLibrary += ".dll";
#elif __APPLE__
    aPluginLibrary += ".dylib";
#elif defined (HPUX) || defined(_hpux)
    aPluginLibrary += ".sl";
#else
    aPluginLibrary += ".so";
#endif
    OSD_SharedLibrary aSharedLibrary(aPluginLibrary.ToCString());
    if(!aSharedLibrary.DlOpen(OSD_RTLD_LAZY)) {
      TCollection_AsciiString error(aSharedLibrary.DlError());
      Standard_SStream aMsg; aMsg << "Could not open: ";
      aMsg << aPluginResource->Value(theKey.ToCString());
      aMsg << "; reason: ";
      aMsg << error.ToCString();
#ifdef OCCT_DEBUG
      std::cout << "could not open: "  << aPluginResource->Value(theKey.ToCString())<< " ; reason: "<< error.ToCString() << std::endl;
#endif
      throw Draw_Failure(aMsg.str().c_str());
    }
    f = aSharedLibrary.DlSymb("PLUGINFACTORY");
    if( f == NULL ) {
      TCollection_AsciiString error(aSharedLibrary.DlError());
      Standard_SStream aMsg; aMsg << "Could not find the factory in: ";
      aMsg << aPluginResource->Value(theKey.ToCString());
      aMsg << error.ToCString();
      throw Draw_Failure(aMsg.str().c_str());
    }
    theMapOfFunctions.Bind(theKey, f);
  }
  else
    f = theMapOfFunctions(theKey);

//   void (*fp) (Draw_Interpretor&, const TCollection_AsciiString&) = NULL;
//   fp = (void (*)(Draw_Interpretor&, const TCollection_AsciiString&)) f;
//   (*fp) (theDI, theKey);

  void (*fp) (Draw_Interpretor&) = NULL;
  fp = (void (*)(Draw_Interpretor&)) f;
  (*fp) (theDI);

}