ROOT_528-00b_version: graf3d/gl/src/TGLQuadric.cxx Source File

00001 // @(#)root/gl:$Id: TGLQuadric.cxx 20882 2007-11-19 11:31:26Z rdm $
00002 
00003 /*************************************************************************
00004  * Copyright (C) 1995-2005, Rene Brun and Fons Rademakers.               *
00005  * All rights reserved.                                                  *
00006  *                                                                       *
00007  * For the licensing terms see $ROOTSYS/LICENSE.                         *
00008  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
00009  *************************************************************************/
00010 
00011 #include "TGLQuadric.h"
00012 #include "TGLIncludes.h"
00013 #include "TError.h"
00014 
00015 //////////////////////////////////////////////////////////////////////////
00016 //                                                                      //
00017 // TGLOutput                                                            //
00018 //                                                                      //
00019 // Wrapper class for GLU quadric shape drawing object. Lazy creation of //
00020 // internal GLU raw quadric on first call to TGLQuadric::Get()          //
00021 //////////////////////////////////////////////////////////////////////////
00022 
00023 ClassImp(TGLQuadric)
00024 
00025 //______________________________________________________________________________
00026 TGLQuadric::TGLQuadric() :
00027    fQuad(0)
00028 {
00029    // Construct quadric
00030 }
00031 
00032 //______________________________________________________________________________
00033 TGLQuadric::~TGLQuadric()
00034 {
00035    // Destroy quadric
00036    if (fQuad) {
00037       gluDeleteQuadric(fQuad);
00038    }
00039 }
00040 
00041 //______________________________________________________________________________
00042 GLUquadric * TGLQuadric::Get()
00043 {
00044    // Get the internal raw GLU qaudric object. Created on first call.
00045    if (!fQuad) {
00046       fQuad = gluNewQuadric();
00047       if (!fQuad) {
00048          Error("TGLQuadric::Get", "create failed");
00049       } else {
00050          gluQuadricOrientation(fQuad, (GLenum)GLU_OUTSIDE);
00051          gluQuadricNormals(fQuad, (GLenum)GLU_SMOOTH);
00052       }
00053    }
00054    return fQuad;
00055 }